Display Panel Light Sensor Layout for Fingerprint and Pulse Sensing

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Solution Overview

Problem

Existing display devices face challenges in efficiently capturing high-resolution fingerprint and pulse information using light-sensing schemes, particularly due to limitations in light reception and operation frequency of conventional light sensors.

Innovation Solution

A display device with a base layer and display element layer incorporating first and second light sensors operating at different frequencies, along with a light-blocking layer and color filters, is designed to enhance light reception and resolution for fingerprint and pulse sensing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a single light sensor operates at a fixed frequency, then the device structure remains simple, but it cannot simultaneously capture high-resolution fingerprint information and pulse information with adequate light reception

Engineering Contradiction:

Improvefingerprint sensing resolutionVSAvoidlight sensor configuration

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent divides the sensing function into two separate light sensors: a first light sensor operating at a first operation frequency for fingerprint sensing, and a second light sensor operating at a second operation frequency for pulse information sensing. This segmentation allows each sensor to be optimized for its specific function, achieving high-resolution fingerprint capture while simultaneously enabling pulse detection without requiring a single complex multi-functional sensor

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The display device integrates multiple sensing functions (fingerprint recognition and pulse measurement) into a single display panel structure. The display element layer serves both display and sensing purposes, with the first and second light sensors co-existing within the same layer to perform different functions simultaneously, achieving multi-functionality without requiring separate devices

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Speed

If the light sensor operates at high frequency to capture pulse information, then pulse detection capability improves, but fingerprint sensing resolution decreases

Engineering Contradiction:

Improveoperation frequencyVSAvoidfingerprint sensing resolution

Core Design Contradiction:

SpeedVSMeasurement precision

Solution Approach 1:

The patent separates the sensing functions into two distinct light sensors with different operation frequencies. The first light sensor operates at a lower first operation frequency optimized for capturing detailed fingerprint patterns with high resolution, while the second light sensor operates at a higher second operation frequency optimized for detecting rapid pulse information. This frequency segmentation resolves the conflict between speed and precision by dedicating different frequency ranges to different sensing tasks

Inventive Principle:

Principle #1Segmentation

3Ease of manufacture

If the light-blocking layer has uniform opening size, then manufacturing is simplified, but light reception efficiency varies for different sensing functions

Engineering Contradiction:

Improvelight-blocking layer fabricationVSAvoidlight reception efficiency

Core Design Contradiction:

Ease of manufactureVSUse of energy by moving object

Solution Approach 1:

The patent implements a light-blocking layer with non-uniform opening characteristics: a first opening overlapping the first light sensor with a first width, and a second opening overlapping the second light sensor with a second width different from the first width. This local variation in opening size optimizes light reception for each specific sensing function - the first opening is configured to maximize light transmission for fingerprint sensing, while the second opening is configured to maximize light transmission for pulse sensing, thereby achieving superior overall light reception efficiency

Inventive Principle:

Principle #3Local quality

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 solution allows for higher resolution fingerprint sensing and improved light reception, enabling simultaneous and efficient capture of biometric and medical information.

Implementation Method 1

the first light sensor disposed in a first sensing area among the plurality of sensing areas and operating at a first operation frequency

Methodology Applied

Scientific EffectLight reflection: Reflection

Implementation Method 2

the second light sensor disposed in a second sensing area among the plurality of sensing areas and operating at a second operation frequency higher than the first operation frequency

Methodology Applied

Scientific EffectLight transmission: Refraction

Implementation Method 3

different operation frequencies, and different amounts of light, respectively

Methodology Applied

Scientific EffectOptical filtering: Filter (optical)

Data Source

PatentUS20260076020A1Display device

Publication Date: 2026.03.12 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes a base layer and a display element layer. The base layer includes a first area and a second area, and the display element layer is disposed on the base layer. In addition, the display element layer includes a first light sensor disposed in the first area and operating at a first operation frequency; and a second light sensor disposed in the second area and operating at a second operation frequency higher than the first operation frequency.