Dual Light-Source Backlight for Wider Display Color Gamut
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Solution Overview
Problem
Existing displays struggle to achieve higher-definition images with an expanded color gamut.
Innovation Solution
A light emitting device with two types of light sources, each including a blue light emitting element and a phosphor layer, alternately turned on to emit first and second emission lights, combining to achieve a wider color gamut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single light source with fixed phosphors is used, then the device structure is simple, but the color gamut is limited
Solution Approach 1:
The backlight unit is divided into multiple independent light sources (first light source with first phosphor layer, second light source with second phosphor layer), each capable of emitting different spectral characteristics. This segmentation allows the system to achieve a broader color gamut by combining emissions from multiple specialized light sources rather than relying on a single light source with fixed phosphors.
Solution Approach 2:
The patent implements dynamic control of multiple light sources through a controller that can independently adjust the emission intensity and timing of each light source. This dynamic capability enables the system to adaptively optimize color gamut and spectral output based on display requirements, transforming a static single-light-source system into a flexible multi-light-source system.
2Adaptability or versatility
If multiple light sources are used to expand color gamut, then the color gamut is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple light sources and their corresponding phosphor layers into an integrated backlight unit structure. The controller merges the emissions from the first light source (with first phosphor layer) and second light source (with second phosphor layer) to produce a composite light output with expanded chromaticity range, achieving broader color gamut while maintaining a unified device architecture.
Solution Approach 2:
Each light source in the patent is designed with multi-functionality - the first light source and first phosphor layer combination can emit one spectral profile, while the second light source and second phosphor layer combination can emit a different spectral profile. This multi-functionality allows a single backlight unit to serve multiple spectral requirements, effectively expanding the achievable color gamut without proportionally increasing overall device complexity.
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 can produce images with a wider color gamut by synchronizing the operation of these light sources, allowing for a broader range of chromaticity points to be displayed.
Implementation Method 1
a blue light emitting element and a phosphor layer, alternately turned on to emit first and second emission lights
Data Source
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AI summary
To provide a light emitting device that is used for a display that is able to display an image having a wider color gamut. This light emitting device includes: a first light source configured to perform an operation of blinking first emission light including first blue light and first red light; and a second light source configured to perform an operation of blinking second emission light independently of the operation of blinking the first emission light by the first light source. The second emission light includes second red light and green light.