Color Conversion Panel Scattering Particles Light Path
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid-crystal display (LCD) devices face a decrease in color conversion efficiency due to photons passing through photoluminescent materials, leading to a deterioration of the color gamut, as vertically incident light does not effectively interact with the color conversion patterns.
Innovation Solution
A color conversion panel with a substrate featuring a light-blocking partition and color conversion patterns, where a light-transmitting layer containing scattering particles is used to scatter blue light horizontally, increasing the interaction with quantum dots in the color conversion patterns, thereby enhancing the color conversion efficiency and gamut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If vertically incident light is used to illuminate the color conversion pattern, then the light path is simplified and the display structure is compact, but the color conversion efficiency decreases because photons pass through the photoluminescent materials without effective interaction
Solution Approach 1:
The patent transitions from vertical light incidence to horizontal light propagation by introducing a light guide layer and using total internal reflection. The light travels horizontally through the light guide layer, passing repeatedly through the color conversion pattern, which increases interaction probability. This dimensional change in light path from vertical to horizontal resolves the contradiction between structural simplicity and conversion efficiency.
Solution Approach 2:
The light guide layer enables continuous light propagation through multiple passes through the color conversion pattern. Instead of a single vertical pass, the light continuously interacts with the photoluminescent materials through total internal reflection, maintaining useful action (color conversion) over an extended path, thereby improving conversion efficiency without significantly increasing structural complexity.
2Ease of manufacture
If the color conversion pattern is disposed directly on the substrate, then the manufacturing process is simplified, but the color gamut deteriorates due to decreased color conversion efficiency
Solution Approach 1:
The light guide layer acts as an intermediary between the light source and the color conversion pattern. It mediates the light path to ensure continuous horizontal propagation through the color conversion pattern, improving conversion efficiency and color gamut. The light guide layer simplifies the positioning requirement of the color conversion pattern while maintaining or improving color quality.
3Adaptability or versatility
If photoluminescent materials are used for color conversion, then the display can achieve color output, but many photons pass through without interacting with the materials, reducing conversion efficiency
Solution Approach 1:
By changing the light propagation direction from vertical to horizontal through the light guide layer, the light path length through the photoluminescent materials is effectively increased. This dimensional change allows more photons to interact with the photoluminescent materials, reducing photon loss while maintaining color output capability.
Solution Approach 2:
The total internal reflection in the light guide layer creates a periodic interaction pattern where light repeatedly passes through the color conversion pattern. This periodic action increases the probability of photon-material interaction, reducing energy loss and improving overall conversion efficiency.
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 increases the efficiency of color conversion, improving the color gamut by ensuring more photons interact with the color conversion patterns, resulting in enhanced light emission and a wider viewing angle.
Implementation Method 1
a light-transmitting layer containing scattering particles and including a first portion disposed in the opening in the third region and a second portion disposed to cover the color conversion patterns
Implementation Method 2
the color conversion pattern may change the color of incident light by using photoluminescent materials such as quantum dots
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A color conversion panel (200) for a display device (1) includes: a substrate (201) including a first region (P1), a second region (P2), and a third region (P3); a light-blocking partition (220) disposed on the substrate and having a plurality of openings via which the first region, the second region and the third region are exposed; color conversion patterns (230a,b) disposed on the substrate in the openings in the first region and in the second region, respectively; and a light-transmitting layer (240) containing scattering particles (SC) and including a first portion (240a) disposed in the opening in the third region and a second portion (240b) disposed to cover the color conversion patterns on the substrate. The scattering particles increase the efficiency of color conversion, such that color gamut may be increased.