Liquid Crystal Optical Path Adjustment for Micro LED Color Crosstalk
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Solution Overview
Problem
Micro LED display panels face challenges with light emission uniformity and mass transfer yield, and the use of color conversion technology introduces a color crosstalk problem due to the large distance between micro LEDs and color conversion layers.
Innovation Solution
A display panel design that includes a first base substrate with a color conversion layer, a light-emitting device layer between the substrate and the color conversion layer, and a liquid crystal layer between the light-emitting device layer and the color conversion layer. The liquid crystal layer has optical path adjustment portions that can change their refractive index in response to an electric field, allowing for the narrowing of light output angles or scattering of light to mitigate color crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If color conversion technology is used to reduce micro LED dependence and simplify mass transfers, then manufacturing complexity and yield loss are reduced, but color crosstalk occurs due to large distance between micro LEDs and color conversion layers
Solution Approach 1:
A liquid crystal layer is introduced as an intermediary component between the light-emitting device layer and color conversion layer. This liquid crystal layer contains optical path adjustment portions that can dynamically control light propagation, serving as a mediator to guide light from micro LEDs to the corresponding color conversion regions while preventing color crosstalk.
Solution Approach 2:
The liquid crystal layer provides dynamic optical path adjustment capabilities through电控 (electrically controlled) refractive index changes. By applying different voltages, the liquid crystal molecules reorient to either guide light directly to the color conversion layer (reducing crosstalk) or allow broader light distribution (improving brightness), enabling adaptive optimization of display performance.
2Ease of manufacture
If the distance between micro LEDs and color conversion layers is increased, then manufacturing and assembly are simplified, but color crosstalk increases affecting display effect
Solution Approach 1:
The liquid crystal layer acts as an optical intermediary that maintains effective light coupling over increased distances. Through its optical path adjustment portions, it extends the effective interaction distance between light sources and color conversion layers while maintaining precise light guidance, thus enabling easier assembly without compromising display quality.
3Object-affected harmful factors
If optical path adjustment portions are added to control light direction, then color crosstalk is reduced, but device complexity increases
Solution Approach 1:
The liquid crystal layer serves multiple functions simultaneously: it acts as an optical path adjustment medium to prevent color crosstalk, serves as a spacer to maintain structural integrity, and provides electrical control interfaces for dynamic optimization. This multi-functionality reduces the need for separate dedicated components for each function.
4Manufacturing precision
If liquid crystal layer with optical path adjustment portions is used to narrow light output angle, then color purity is improved, but power consumption increases
Solution Approach 1:
The liquid crystal layer enables dynamic optimization of power consumption based on display content requirements. For pure color displays, the optical path adjustment portions are activated to narrow light angles and improve color purity. For mixed color displays requiring broader light distribution, the system can reduce or eliminate voltage application, thereby reducing power consumption while maintaining adequate display 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 effectively reduces color crosstalk and improves color purity during the display of pure colors, while also enhancing display brightness and reducing power consumption during the display of mixed colors.
Implementation Method 1
in light emitted by the light-emitting device, light incident to the second optical path adjustment portion through the first optical path adjustment portion is refracted so as to narrow a light output angle of the light-emitting device
Implementation Method 2
or is scattered for at least once
Implementation Method 3
The liquid crystal layer has optical path adjustment portions that can change their refractive index in response to an electric field
Data Source
AI summary
The present disclosure provides a display panel, including: a first base substrate; a color conversion layer; a light-emitting device layer; and a liquid crystal layer. The liquid crystal layer includes a first optical path adjustment portion and a second optical path adjustment portion spaced apart from each other. Orthographic projections of the first optical path adjustment portion and a light-emitting device on the first base substrate at least partially overlaps with each other, and orthographic projections of the second optical path adjustment portion and the light-emitting device on the first base substrate are spaced apart from each other. In response to the second optical path adjustment portion being in a first state, in light emitted by the light-emitting device, light incident to the second optical path adjustment portion through the first optical path adjustment portion is refracted, or is scattered for at least once.