Backlight Light-Modifying Regions Reduce Color Shift
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Solution Overview
Problem
Quantum dot backlights in display apparatuses suffer from color shift due to limited light conversion efficiency, leading to impure white light emission and non-uniform brightness, which degrades display quality.
Innovation Solution
A backlight design incorporating light-modifying regions with quantum dot materials on a reflective sheet, where light-emitting elements emit monochromatic light that is converted into white light by light-converting devices, supplementing the conversion capability of a quantum dot layer to reduce color shift and improve uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If quantum dot backlight is used to improve display color gamut, then color gamut is improved, but color shift occurs due to limited light conversion efficiency
Solution Approach 1:
The patent divides the light conversion function into two segments: a first light-converting device (e.g., quantum dot layer) that converts monochromatic light to white light, and a second light-converting device (e.g., phosphor layer) that converts remaining monochromatic light to white light. This segmentation allows each component to handle specific portions of the light spectrum, improving overall conversion efficiency and reducing color shift while maintaining wide color gamut.
Solution Approach 2:
The patent applies different light-converting materials with specific local qualities to different regions of the backlight module. The first light-converting device is positioned to receive direct monochromatic light, while the second light-converting device is positioned to receive light reflected from the first device. Each region uses materials optimized for its specific function, improving overall color uniformity and reducing color shift.
2Manufacturing precision
If quantum dot layer converts monochromatic light to white light, then white light purity is improved, but light conversion efficiency is limited causing non-uniform brightness
Solution Approach 1:
The first light-converting device performs preliminary conversion of monochromatic light to white light before the light reaches the second light-converting device. This preliminary action reduces the intensity of monochromatic light that needs to be converted by the second device, allowing both devices to operate within their optimal efficiency ranges and achieve uniform brightness across the display.
Solution Approach 2:
The first light-converting device acts as an intermediary between the monochromatic light source and the second light-converting device. It converts a portion of the monochromatic light to white light, then the remaining light (both converted and unconverted) is processed by the second device. This intermediary role allows the system to achieve higher overall conversion efficiency and uniform brightness while maintaining high white light purity.
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 effectively converts a portion of color light into white light within the light-modifying regions, enhancing the purity of white light emission and reducing color shift, thereby improving display quality and uniformity.
Implementation Method 1
the light-converting device being capable of carrying out optical process on light emitted from the light-emitting elements. In some implementations, the light emitted from the light-emitting elements is monochromatic light and the optical process is to convert the monochromatic light into mixed light.
Data Source
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AI summary
The present disclosure provides a backlight, a backlight module and a display apparatus. The backlight includes a backplane, a reflective sheet and a plurality of light-emitting elements, the reflective sheet is arranged on an inner surface of the backplane, the backlight also includes at least one light-modifying region, the light-modifying region is arranged on the reflective sheet, the light-modifying region comprises at least one light-converting device, and the light-converting device can carry out optical process on light emitted from the light-emitting elements.