Optical Sensing Circuit Grouping for Stable Display Biometrics

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Solution Overview

Problem

Existing biosensing technologies in electronic devices face challenges in securing sufficient light exposure periods and digital sensing signal frequencies, particularly in embedded optical sensing circuits, leading to inconsistent and unreliable biosensing results.

Innovation Solution

The display device and electronic device incorporate a display panel with pixel and optical sensing circuits, a gate driver, readout circuit, and a driving controller that group optical sensing circuits into multiple groups, applying reset signals sequentially over multiple frames to ensure consistent light exposure periods and frequencies, thereby stabilizing the digital sensing signal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If optical sensing circuits are operated at high frequency to improve biosensing accuracy, then the light exposure period becomes insufficient, but biosensing accuracy requires sufficient light exposure period

Engineering Contradiction:

Improvebiosensing accuracyVSAvoidlight exposure period

Core Design Contradiction:

Measurement precisionVSDuration of action of moving object

Solution Approach 1:

The optical sensing circuits are divided into multiple groups (first group, second group, third group, etc.) that are operated sequentially rather than simultaneously. This segmentation allows each group to have an extended light exposure period while maintaining high overall sensing frequency through rapid alternation between groups.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements periodic operation by alternating between different groups of optical sensing circuits in a cyclic manner. Each group undergoes complete sensing cycles (light exposure, sensing, readout) periodically, ensuring sufficient exposure time for each group while maintaining high frequency operation across the entire system.

Inventive Principle:

Principle #19Periodic action

2Measurement precision

If the light exposure period is extended to improve biosensing accuracy, then the frequency of digital sensing signal decreases, but accurate biosensing requires high frequency digital sensing signal

Engineering Contradiction:

Improvebiosensing accuracyVSAvoiddigital sensing signal frequency

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

By dividing optical sensing circuits into multiple groups that operate in parallel but are read out sequentially, the system achieves both extended individual exposure periods and high overall signal frequency through the parallel processing capability of multiple groups.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Multiple groups of optical sensing circuits are prepared and initialized in advance, allowing them to accumulate light exposure simultaneously. The readout operation then processes these pre-prepared groups sequentially, achieving high frequency output without compromising individual exposure duration.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If multiple groups of optical sensing circuits are operated simultaneously to maintain high frequency, then the light exposure period for each group becomes insufficient, but high frequency operation is needed for accurate biosensing

Engineering Contradiction:

Improvedigital sensing signal frequencyVSAvoidlight exposure period

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

Inventive Principle:

Principle #19Periodic action

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

This approach secures consistent and reliable biosensing by maintaining a constant light exposure period and frequency, enhancing the amplitude and smoothness of the pulse signal, ensuring accurate biometric detection.

Implementation Method 1

generating a sensing current in response to a reflected light generated from a user's body by an optical sensing circuit

Methodology Applied

Scientific EffectPhotoelectric effect: Photoelectric Effect

Data Source

PatentUS20260038298A1Display device including optical sensing circuit and electronic device including the display device

Publication Date: 2026.02.05 SAMSUNG DISPLAY CO LTD

AI summary

A display device comprises a display panel including pixel circuits and optical sensing circuits, a gate driver configured to provide gate signals to the pixel circuits and the sensing circuits, a readout circuit receiving sensing currents output from the optical sensing circuits in response to the gate signals and generating a pulse signal based on the sensing currents, and a driving controller configured to control the gate driver and the readout circuit, and to determine a user's a biometric indicator based on the pulse signal. The optical sensing circuits initialized with a reset voltage in response to reset signals are grouped into first to n-th groups. The reset signals are sequentially applied to the first to n-th groups as first to n-th group reset signals during n frames, wherein n is an integer greater than or equal to 2.