Color Conversion Display Stack With Reflective Dimming Patterns
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Solution Overview
Problem
Flat display apparatuses face limitations in enhancing color saturation due to incomplete conversion of light beams emitted by light emitting components, as not all light is converted to desired colors after passing through color conversion patterns.
Innovation Solution
The manufacturing method involves forming wavelength selective dimming patterns with a base material and scattering particles on a color filter substrate, which are designed to have specific thickness and particle size ranges, allowing for improved light conversion and reflection to enhance color saturation. These patterns are integrated with color conversion patterns and encapsulation layers to form a color conversion substrate that is assembled with a light emitting component array substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If color conversion patterns are used to convert light wavelengths, then color saturation is improved, but not all light beams are completely converted resulting in limited color saturation enhancement
Solution Approach 1:
The patent implements a feedback mechanism by introducing a reflective layer beneath the color conversion patterns. Unconverted light that passes through the color conversion patterns is reflected back by the reflective layer, providing a second opportunity for wavelength conversion. This feedback loop increases the overall conversion efficiency and color saturation by utilizing light that would otherwise be lost.
Solution Approach 2:
The patent adds a dimensional element by stacking multiple color conversion patterns with different wavelength conversion characteristics in series. Instead of relying on a single conversion layer, the light passes through multiple layers sequentially, each contributing to the overall color conversion. This multi-dimensional approach ensures more complete wavelength conversion and enhances color saturation.
2Illumination intensity
If multiple layers are added to improve color conversion, then color saturation increases, but device complexity increases
Solution Approach 1:
The reflective layer serves multiple functions: it reflects unconverted light back for further conversion, provides structural support for the stacked layers, and helps manage optical paths. By making this single layer multi-functional, the patent reduces the need for additional dedicated components, thereby limiting the increase in device complexity while still achieving improved color saturation.
Solution Approach 2:
The patent combines multiple color conversion patterns with different conversion characteristics into a single integrated stack structure. Rather than using separate independent systems for different wavelength conversions, the multiple conversion functions are merged into one compact multi-layer assembly, reducing overall device complexity while maintaining enhanced color saturation performance.
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 color conversion efficiency and saturation by allowing unconverted light to be reflected back for further conversion, improving the overall optical efficiency of the display apparatus.
Implementation Method 1
The wavelength selective dimming pattern is configured to reflect the unconverted light to the color conversion pattern
Implementation Method 2
one of the wavelength selective dimming patterns comprises a base material and a plurality of scattering particles
Data Source
AI summary
A display apparatus includes a color filter substrate, a first encapsulation layer, a first bank layer, wavelength selective dimming patterns, color conversion patterns, a second encapsulation layer, a driving circuit substrate, a second bank layer and light emitting components. The wavelength selective dimming patterns are disposed in at least a portion of first openings of the first bank layer. The color conversion patterns are disposed in the first openings and on the wavelength selective dimming patterns. One wavelength selective dimming pattern includes a base material and scattering particles. The wavelength selective dimming pattern has a thickness within a range of 2 μm to 10 μm in a direction perpendicular to the color filter substrate. A volume ratio of the scattering particles to the wavelength selective dimming pattern falls within a range of 0.5% to 4.5%. Diameters of the scattering particles fall within a range of 80 nm to 200 nm.