AMOLED Microcavity Display Module for Color Purity
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Solution Overview
Problem
Current AMOLED full-color display technologies face issues with color mixing errors and pixel defects due to inaccuracies in vapor deposition methods, leading to suboptimal color purity and display quality.
Innovation Solution
A full-color display module with a microcavity effect is developed, utilizing a glass substrate, thin film transistor layer, anode and cathode layers, and a resonant cavity structure with varying thicknesses of electron hole transmission layers to enhance color purity by filtering specific wavelengths of light, thereby improving electroluminescence spectra.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If vapor deposition method with metal mask is used to fabricate pixel structures, then full-color display can be achieved, but color mixing errors and pixel defects occur due to position shifts
Solution Approach 1:
The patent changes the fundamental parameter of light generation from wavelength-selective emission (requiring precise material deposition) to white light emission followed by optical filtering. This parameter change in the light generation mechanism eliminates the need for precise vapor deposition positioning, as the color is determined by optical path length in the microcavity rather than material placement accuracy.
Solution Approach 2:
The patent replaces the mechanical vapor deposition system with precise alignment requirements with an optical system based on microcavity resonance. Instead of relying on mechanical precision of mask alignment, the color accuracy is achieved through optical interference effects determined by cavity dimensions, substituting a mechanical positioning problem with an optical resonance solution.
2Manufacturing precision
If separate vapor deposition for red, green and blue pixels is performed, then color purity can be improved, but manufacturing complexity and time increase
Solution Approach 1:
The patent merges the fabrication process for all three colors into a single white light emitting layer deposition step. Instead of performing separate vapor deposition for red, green, and blue pixels, a single white light emitting layer is deposited across all pixels, and color is then differentiated through the optical microcavity structure. This combining of deposition steps significantly improves manufacturing efficiency while maintaining color purity through optical rather than material differentiation.
3Manufacturing precision
If mask alignment accuracy is increased to prevent position shifts, then manufacturing cost and process complexity increase
Solution Approach 1:
The patent extracts the color selection function from the vapor deposition process and places it in the optical microcavity structure. By taking out the wavelength-selective function from the material deposition stage and relocating it to the optical resonance stage, the stringent alignment requirements are eliminated from the deposition process, simplifying the manufacturing workflow.
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 microcavity structure effectively strengthens specific wavelengths of red, green, and blue light, reducing color mixing errors and pixel defects, resulting in improved color purity and display quality.
Implementation Method 1
emits three primary color lights of red, green and blue by making white light to pass through a microcavity structure and occur the microcavity resonance effect, then the lights at specific wavelengths are strengthened
Data Source
AI summary
The present disclosure provides a full-color display module with microcavity effect. The full-color display module includes a glass substrate, a thin film transistor layer, an anode layer, a cathode layer, a white light emitting layer and a resonant cavity structure. The resonant cavity structure includes a first transparent organic layer, a first semi-reflective metal layer, a second transparent organic layer and a second semi-reflective metal layer, which are sequentially formed on the cathode layer, and the lights at specific wavelengths are strengthened by adjusting thicknesses of the transparent organic layers.