OLED Display Photosensor Shutter Heart Rate Measurement

Solution Overview

Problem

Conventional heart rate measurement devices using photosensors require an additional light source, increasing power consumption and production costs.

Innovation Solution

A display device with a photosensor that utilizes the light emitted by an organic light-emitting diode display panel, eliminating the need for an additional light source by positioning the photosensor between the display panel and a protection plate, where the light emitted by the panel is reflected and detected.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If an additional light source is used in the photosensor, then the photosensor can effectively measure heart rate, but the power consumption and product cost increase

Engineering Contradiction:

Improveheart rate measurement capabilityVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The display panel serves dual functions: displaying images and providing light for photosensor operation. The organic light-emitting diode (OLED) in the display panel emits light that is utilized by the photosensor for heart rate measurement, eliminating the need for a separate light source and reducing overall power consumption.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent combines the display function and light source function into a single integrated system. The display panel and photosensor are positioned in close proximity, allowing the display panel to serve as both the visual output device and the illumination source for the photosensor, thereby reducing component count and power consumption.

Inventive Principle:

Principle #5Merging (Combining)

2Measurement precision

If an additional light source is used in the photosensor, then the photosensor can effectively measure heart rate, but the product cost increases

Engineering Contradiction:

Improveheart rate measurement capabilityVSAvoidproduct cost

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The display panel serves dual functions: displaying images and providing light for photosensor operation. The organic light-emitting diode (OLED) in the display panel emits light that is utilized by the photosensor for heart rate measurement, eliminating the need for a separate light source and reducing overall power consumption.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent combines the display function and light source function into a single integrated system. The display panel and photosensor are positioned in close proximity, allowing the display panel to serve as both the visual output device and the illumination source for the photosensor, thereby reducing component count and power consumption.

Inventive Principle:

Principle #5Merging (Combining)

3Device complexity

If the photosensor is positioned between the display panel and protection plate, then no additional light source is needed, but the light transmission path must be carefully controlled

Engineering Contradiction:

Improvedevice simplificationVSAvoidlight transmission control

Core Design Contradiction:

Device complexityVSDifficulty of detecting and measuring

Solution Approach 1:

The patent employs a shutter mechanism that can dynamically open and close to control light transmission. The shutter is positioned between the display panel and photosensor, allowing selective passage of light during different operational phases, thereby enabling precise control over the light path despite the integrated configuration.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The shutter acts as an intermediary element between the display panel and photosensor. It mediates the light transmission by opening to allow light from the display panel to reach the photosensor for measurement, and closing to block ambient light or prevent interference, thus controlling the optical path in the integrated structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 configuration simplifies the device, reduces power consumption, and lowers production costs while enabling effective heart rate measurement without an additional light source.

Implementation Method 1

the photosensor includes a shutter for controlling light emitted by the display panel to transmit through the window or the protection plate

Methodology Applied

Scientific EffectLight emission from organic light emitting diode: Organic Light-emitting Diode

Implementation Method 2

a photodetector for receiving the light reflected after transmitting through the window or the protection plate

Methodology Applied

Scientific EffectLight reflection: Reflection

Implementation Method 3

a photodetector for receiving the light reflected after transmitting through the window or the protection plate

Methodology Applied

Scientific EffectPhotoelectric detection: Photoelectric Effect

Data Source

PatentUS10374019B2Display device

Publication Date: 2019.08.06 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes: a display panel including a display area for displaying an image; a window provided on an upper portion of the display panel; a protection plate provided on a lower portion of the display panel; and a photosensor provided at least one of between the display panel and the window and between the display panel and the protection plate, wherein the photosensor includes a shutter for controlling light emitted by the display panel to transmit through the window or the protection plate, and a photodetector for receiving the light reflected after transmitting through the window or the protection plate.