Display Panel Dual Blue Filters Reduce Harmful Light

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Solution Overview

Problem

Conventional display technologies emit harmful short wavelength blue light, causing eye strain and potential photochemical damage, while increasing the proportion of long wavelength blue light to reduce harm leads to increased power consumption and decreased reliability.

Innovation Solution

A display panel with a color filter substrate featuring two blue sub-pixels with different filters, one transmitting short wavelength blue light and the other long wavelength blue light, adjusted in intensity and thickness to balance light emission and reduce harmful blue light exposure without affecting image quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If the proportion of long wavelength blue light is increased to reduce harm, then eye safety is improved, but power consumption increases and reliability decreases

Engineering Contradiction:

Improveharmful blue light exposureVSAvoiddisplay reliability

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The blue light emission is segmented into two distinct wavebands using two separate blue sub-pixels with different blue filters. The first blue sub-pixel transmits short wavelength blue light (400-455nm) while the second blue sub-pixel transmits long wavelength blue light (455-500nm), allowing independent control and optimization of each waveband's intensity to reduce harmful effects while maintaining reliability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different blue filters with distinct spectral transmission characteristics are applied to different blue sub-pixels. The first blue filter has peak transmission in the short wavelength range while the second blue filter has peak transmission in the long wavelength range, creating localized spectral quality differences that enable targeted blue light management

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If the proportion of long wavelength blue light is increased to reduce harm, then eye safety is improved, but power consumption increases

Engineering Contradiction:

Improveharmful blue light exposureVSAvoidpower consumption

Core Design Contradiction:

Object-affected harmful factorsVSUse of energy by moving object

Solution Approach 1:

The invention changes the spectral parameters of blue light emission by using two blue filters with different peak transmission wavelengths and bandwidths. This allows optimization of the blue light spectrum to reduce harmful short wavelength content while maintaining sufficient long wavelength blue light for display quality, thereby reducing power consumption compared to conventional single blue filter designs

Inventive Principle:

Principle #35Parameter changes

3Illumination intensity

If short wavelength blue light is transmitted to maintain brightness, then display brightness is improved, but eye strain and photochemical damage increase

Engineering Contradiction:

Improvedisplay brightnessVSAvoideye strain and photochemical damage

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention converts the potentially harmful short wavelength blue light into a controllable parameter by using a first blue filter with optimized transmission characteristics. By carefully designing the filter's peak wavelength and bandwidth, the short wavelength blue light contributes to overall brightness while its harmful effects are mitigated through the filter's selective transmission properties

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 display panel effectively reduces the intensity of harmful short wavelength blue light while maintaining brightness and chromaticity, minimizing eye strain and power consumption while ensuring reliable and stable display performance.

Implementation Method 1

The first blue filter is configured to transmit a first waveband light, the second blue filter is configured to transmit a second waveband light

Methodology Applied

Scientific EffectOptical filtering: Filter (optical)

Data Source

PatentUS11531229B2Display panel, display apparatus and electronic device

Publication Date: 2022.12.20 BEIJING BOE DISPLAY TECH CO LTD

AI summary

A display panel has a plurality of pixel units. Each pixel unit includes a first blue sub-pixel and a second blue sub-pixel. The display panel includes a color filter substrate. The color filter substrate includes a plurality of filter groups. Each filter group includes a first blue filter disposed in a corresponding first blue sub-pixel and a second blue filter disposed in a corresponding second blue sub-pixel. The first blue filter is configured to transmit a first waveband light, and the second blue filter is configured to transmit a second waveband light. A wavelength corresponding to a first peak of the first waveband light is less than a wavelength corresponding to a second peak of the second waveband light. An intensity of the first waveband light emitted from the first blue sub-pixel is less than an intensity of the second waveband light emitted from the second blue sub-pixel.