OLED Micro-Cavity Crosstalk Reduction via Auxiliary Layer Segmentation
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Solution Overview
Problem
Existing OLED display panels face issues with crosstalk and degraded performance due to adjustments in micro-cavity structure cavity length made by varying the thickness of the hole transport layer, which affects light-emitting efficiency and color purity.
Innovation Solution
The OLED display panel incorporates a micro-cavity structure with a second auxiliary light-emitting layer having a zero-field electron mobility greater than or equal to 1.0×10−4 cm2/V·S, made of an electron-type material, to adjust the cavity length and balance electron and hole injection, reducing crosstalk and improving light-emitting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the cavity length of the micro-cavity structure is adjusted by the thickness of the hole transport layer, then the light-emitting characteristics (brightness, light-emitting efficiency, color purity) can be optimized, but serious crosstalk occurs and display performance degrades
Solution Approach 1:
The patent segments the auxiliary light-emitting layer into two distinct sub-layers: a first sub-auxiliary light-emitting layer and a second sub-auxiliary light-emitting layer. This segmentation allows independent optimization of each layer's function - the first layer controls cavity length for light-emitting efficiency while the second layer manages electron transport to prevent crosstalk, thereby resolving the contradiction between improving light-emitting efficiency and preventing crosstalk
Solution Approach 2:
The patent applies local quality by assigning different material properties to different layers. The first sub-auxiliary light-emitting layer uses materials optimized for cavity length adjustment, while the second sub-auxiliary light-emitting layer uses electron-type materials with specific electron mobility characteristics (≥1.0×10^-4 cm²/V·S) to locally control electron transport and eliminate crosstalk in specific regions
2Power
If the cavity length is adjusted to improve light-emitting efficiency and brightness, then the coupling efficiency of radiation dipole and electric field increases, but the display performance degrades due to crosstalk
Solution Approach 1:
By dividing the auxiliary light-emitting layer into two functional sub-layers, the patent enables independent optimization: the first sub-layer adjusts cavity length to maximize brightness and light-emitting efficiency, while the second sub-layer ensures proper electron transport to maintain display performance and prevent crosstalk, thus resolving the contradiction between brightness enhancement and display performance reliability
Solution Approach 2:
The second sub-auxiliary light-emitting layer acts as an intermediary between the light-emitting layer and the second electrode. It mediates electron transport with controlled electron mobility, ensuring that electrons are properly transported without causing crosstalk, thereby maintaining display performance reliability while allowing the first sub-layer to optimize brightness
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 enhances light-emitting efficiency and extends the life span of the OLED display panel by balancing electron and hole recombination and reducing crosstalk, while allowing for precise adjustment of the micro-cavity structure without degrading performance.
Implementation Method 1
The effects of reflection, total reflection, interference, refraction, or scattering, etc. on the interface of discontinuous refractive index are configured to confine the emitted light within a relatively small wavelength band
Implementation Method 2
The effects of reflection, total reflection, interference, refraction, or scattering, etc. on the interface of discontinuous refractive index are configured to confine the emitted light
Implementation Method 3
The effects of reflection, total reflection, interference, refraction, or scattering, etc. on the interface of discontinuous refractive index are configured to confine the emitted light
Implementation Method 4
The effects of reflection, total reflection, interference, refraction, or scattering, etc. on the interface of discontinuous refractive index are configured to confine the emitted light
Implementation Method 5
The effects of reflection, total reflection, interference, refraction, or scattering, etc. on the interface of discontinuous refractive index are configured to confine the emitted light
Implementation Method 6
Driven by an electric field, the light-emitting material in the OLED emits light through carrier injection and recombination
Data Source
AI summary
The present disclosure provides an OLED display panel, including a substrate and a plurality of pixel regions disposed on the substrate and emitting light in different colors. A pixel region includes a first electrode, a first auxiliary light-emitting layer, a light-emitting layer, a second auxiliary light-emitting layer, and a second electrode. A micro-cavity structure is formed between the first electrode and the second electrode. The second auxiliary light-emitting layer includes at least a first sub-auxiliary light-emitting layer. The second auxiliary light-emitting layer corresponding to the pixel regions emitting light in at least one color also includes a second sub-auxiliary light-emitting layer. At least one of the first sub-auxiliary light-emitting layer and the second sub-auxiliary light-emitting layer is made of at least a first electron-type material. The second sub-auxiliary light-emitting layer has a zero-field electron mobility greater than or equal to a pre-determined threshold.