Front Light Source with Quantum Dot Layer for Reflective Display
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Solution Overview
Problem
Reflective display apparatuses with traditional front light sources suffer from poor optical properties, resulting in suboptimal display effects, especially in low ambient light or dark environments.
Innovation Solution
A front light source configuration combining a light guide member, a light source element, and quantum dot elements on the same layer, where the light source emits a primary color and the quantum dots emit three primary colors under excitation, enhanced by a photonic crystal element for balanced light transmission and reflection, and grooves on the light guide member for targeted light extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a traditional front light source is added to a reflective display apparatus to improve display effect in weak ambient light, then the display visibility is improved, but the optical properties remain poor resulting in suboptimal display effect
Solution Approach 1:
The patent changes the spectral parameters of the light source by using a quantum dot layer that converts the broad spectrum LED light into three distinct emission peaks corresponding to the three primary colors. This parameter transformation from continuous spectrum to discrete spectral lines resolves the contradiction by providing both sufficient illumination intensity and optimal optical properties for display quality
Solution Approach 2:
The patent employs a composite light source system combining LED (light source element) with quantum dot materials (quantum dot element) to create a hybrid illumination system. This composite structure leverages the high efficiency of LEDs and the spectral conversion capabilities of quantum dots, achieving both bright illumination and superior color rendering that resolves the optical property deficiencies
2Illumination intensity
If quantum dot elements are added to emit three primary colors under excitation, then the color rendering is improved, but the light utilization efficiency may be reduced due to absorption and re-emission losses
Solution Approach 1:
The patent applies local quality by positioning the quantum dot layer specifically at the interface between the light guide member and the display panel, where it can selectively convert light wavelengths locally. This localized conversion minimizes energy loss by only transforming the necessary spectral components rather than converting the entire light spectrum, thus maintaining high light utilization efficiency while achieving excellent color rendering
3Stability of the object's composition
If a photonic crystal element is introduced to balance light transmission and reflection, then the light distribution uniformity is improved, but the device complexity increases
Solution Approach 1:
The photonic crystal element serves multiple functions simultaneously: it acts as a wavelength-selective reflector to balance the distribution of different color lights, functions as a structural support layer, and contributes to the overall optical coupling between the light guide and display panel. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving uniform light distribution
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 significantly improves the optical properties of the front light source, achieving a better display effect by ensuring uniform and balanced emission of red, green, and blue light, enhancing the overall display performance.
Implementation Method 1
the quantum dot element being configured to emit light of three colors including three-primary colors under excitation of the light emitted by the light source element
Implementation Method 2
the light guide member being configured to guide light emitted by the light emitting member onto the display panel
Implementation Method 3
the photonic crystal element being configured to half-transmit and half-reflect light of the first color and transmit light of the second color and light of the third color
Data Source
AI summary
Provided are a front light source and a display apparatus. The front light source is disposed on a light emitting side of a display panel. The front light source includes: a light guide member and a light emitting member disposed on a light incident side of the light guide member, the light guide member being configured to guide light emitted by the light emitting member onto the display panel; the light emitting member includes: a light source element and a quantum dot element which are disposed on a same layer, the light source element being configured to emit light of a first color, and the quantum dot element being configured to emit light of three colors including three-primary colors under excitation of the light emitted by the light source element, the first color is one of the three-primary colors.