Display Color Conversion Panel with Refractive Index Contrast
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Solution Overview
Problem
Display devices suffer from light loss and reduced color reproducibility due to polarizers and color filters, necessitating improvements in light emission efficiency and color accuracy.
Innovation Solution
Incorporating a color conversion panel with a substrate, color conversion layers, and optical layers having specific refractive indices, along with capping layers and an optical bonding layer to enhance light reflection and directionality, thereby improving light emission and color reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If color filters are used in the display device, then color reproduction is achieved, but light loss increases and light emission efficiency decreases
Solution Approach 1:
The patent changes the optical parameters of the bonding layer by controlling its thickness (1μm to 5μm) and refractive index to achieve constructive interference of light waves, thereby improving light emission efficiency without requiring additional color filters
Solution Approach 2:
The patent uses a composite structure combining the display panel with a color conversion panel that includes quantum dots or phosphors, where the bonding layer acts as an optical interference layer to enhance light extraction efficiency while maintaining color reproduction
2Illumination intensity
If conventional bonding layers are used between display panel and color conversion panel, then structural simplicity is maintained, but light emission rate and color reproducibility are insufficient
Solution Approach 1:
The bonding layer serves multiple functions simultaneously: it provides mechanical bonding between panels, acts as an optical interference layer to enhance light extraction, and functions as part of the color conversion system, thereby improving light emission rate without proportionally increasing device complexity
Solution Approach 2:
The patent applies specific optical properties (refractive index and thickness) to the bonding layer at the interface between the display panel and color conversion panel, creating localized optical enhancement without modifying the entire device structure
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 significantly enhances light emission rate and color reproducibility by utilizing total reflection principles between capping and optical layers, resulting in improved display quality and efficiency.
Implementation Method 1
utilizing total reflection principles between capping and optical layers
Implementation Method 2
A refractive index of the optical layer is lower than at least one of a refractive index of the first capping layer and a refractive index of the second capping layer
Data Source
AI summary
An exemplary display device includes: a display panel; a color conversion panel overlapping the display panel; and an optical bonding layer positioned between the display panel and the color conversion panel. The color conversion panel includes: a substrate; a color conversion layer and a transmission layer positioned between the substrate and the display panel; a first capping layer having one side facing the color conversion layer and the transmission layer, and another side facing the display panel; a second capping layer positioned between the first capping layer and the display panel; and an optical layer positioned between the first capping layer and the second capping layer and/or between the second capping layer and the optical bonding layer. A refractive index of the optical layer is lower than at least one of a refractive index of the first capping layer and a refractive index of the second capping layer.