Photochromic Layer UV Absorption for Display Contrast

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Solution Overview

Problem

Display units with light-transmissive regions suffer from reduced visibility due to contrast deterioration and unnatural screen visibility in surrounding environments, particularly when displaying black images.

Innovation Solution

Incorporating a photochromic layer that changes color with ultraviolet light and an ultraviolet absorption layer to improve contrast and reduce screen visibility by using a display panel with organic light-emitting pixels, including a sub-pixel emitting ultraviolet light to color the photochromic layer, and optionally using a light guide plate or ultraviolet light-emitting layer for enhanced functionality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a light-transmissive region is provided in the display region, then visibility through the display is improved, but contrast is deteriorated

Engineering Contradiction:

ImprovevisibilityVSAvoidcontrast

Core Design Contradiction:

Illumination intensityVSLoss of information

Solution Approach 1:

The display region is segmented into light-transmissive regions and non-light-transmissive regions, allowing different optical properties in different areas to simultaneously achieve visibility and contrast requirements

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The display device dynamically adjusts the emission intensity of the organic electroluminescent element and the transmission characteristics of the light-transmissive region based on ambient light conditions, optimizing both visibility and contrast adaptively

Inventive Principle:

Principle #15Dynamics

2Reliability

If the screen displays black during non-display of an image, then the display function is clear, but the screen becomes noticeably unnatural in the surrounding environment

Engineering Contradiction:

Improvedisplay function clarityVSAvoidunnatural screen visibility

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The light-transmissive region changes its optical characteristics from emitting black (non-display mode) to transmitting ambient light (surrounding mode), making the screen blend naturally with the environment when not actively displaying images

Inventive Principle:

Principle #32Color changes

Solution Approach 2:

The display device dynamically switches between black emission mode for active display and ambient light transmission mode for non-display periods, optimizing both display clarity and environmental blending

Inventive Principle:

Principle #15Dynamics

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 enhances image contrast and reduces screen visibility by coloring the photochromic layer with ultraviolet light, improving visibility and making the screen less noticeable in the surrounding environment during non-image display.

Implementation Method 1

a photochromic layer configured to be colored by ultraviolet light and be decolored or color-faded by visible light

Methodology Applied

Scientific EffectPhotochromism: Photochromism

Implementation Method 2

an ultraviolet absorption layer

Methodology Applied

Scientific EffectUltraviolet absorption: Absorption (EM radiation)

Implementation Method 3

The pixels are provided below the image display surface and each include an organic light-emitting layer

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS10839745B2Display unit including a photochromic layer and an ultraviolet absorption layer

Publication Date: 2020.11.17 MAGNOLIA BLUE CORP

AI summary

A display unit includes a display panel, a photochromic layer, and an ultraviolet absorption layer. The photochromic layer is configured to be colored by ultraviolet light and be decolored or color-faded by visible light. The display panel includes an image display surface with a plurality of pixels. The pixels are provided below the image display surface and each include an organic light-emitting layer.