Top-Emission OLED Micro Cavity with Anode Modulation
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Solution Overview
Problem
Top-emission type weak micro cavity white light OLED devices face challenges in achieving perfect color selectivity and energy utilization due to stray light transmission, while strong micro cavity devices suffer from energy loss and high power consumption.
Innovation Solution
A top-emission type micro cavity OLED display device with an array substrate, a reflection metal layer, an anode modulation layer, and a cathode layer, where the anode modulation layer is a translucent conductive material, divided into sub-pixels with different thicknesses to achieve color display through micro resonance cavity effects without a color filter layer, enhancing light output and purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a top-emission type weak micro cavity white light OLED device matches a color filter layer, then the device structure is simpler, but color purity is reduced due to stray light transmission
Solution Approach 1:
The patent changes the optical parameters of the micro cavity by adjusting the reflectivity of the anode and cathode, transforming the cavity from weak to strong. This parameter change enables the cavity to effectively suppress stray light transmission through the color filter layer, thereby improving color purity while maintaining the simpler device structure without color filters
Solution Approach 2:
The patent extracts and eliminates the color filter layer from the device structure by using a strong micro cavity configuration. The strong micro cavity itself provides sufficient color selectivity, making the color filter layer redundant. This extraction simplifies the device structure while maintaining or improving color purity
2Manufacturing precision
If a top-emission type strong micro cavity white light OLED device matches a color filter layer, then color purity is improved, but energy loss increases and power consumption rises
Solution Approach 1:
The patent extracts and removes the color filter layer from the optical path. By using a strong micro cavity configuration alone, the device achieves high color purity without the need for color filters that would otherwise cause energy loss through absorption and reflection. This eliminates the energy loss associated with color filtering while maintaining improved color purity
Solution Approach 2:
The strong micro cavity acts as an intermediary that provides color selectivity without the energy losses inherent in color filter layers. The micro cavity structure mediates the light emission process, achieving wavelength selection through constructive and destructive interference rather than through absorptive filtering, thereby improving energy efficiency
3Ease of manufacture
If traditional fine mask technology is used for red, green, and blue sub-pixels, then color display is achieved, but resolution requirements cannot be met due to process limitations
Solution Approach 1:
The patent replaces the mechanical fine mask patterning system with an optical micro cavity resonance system. Instead of using physical masks to define sub-pixel boundaries and colors, the invention uses optical interference effects within micro cavities to achieve color separation and sub-pixel definition. This substitution enables higher resolution displays by eliminating the process limitations of mechanical mask technology
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 solution allows for higher resolution displays with improved color purity and reduced power consumption by eliminating the need for fine mask technology and color filters, leveraging multi-beam interference principles for enhanced light intensity and color gamut.
Implementation Method 1
The top-emission type micro cavity OLED display device achieves the full-color display effect mainly by means of a micro resonance cavity effect
Implementation Method 2
The micro resonance cavity effect refers to an optical interference effect inside the OLED device, which has to prepare a half mirror that is semi-transparent and semi-reflective at a light exit of the device. When photons are emitted from a light-emitting layer, mutual interference occurs between a reflection anode and the half mirror, causing constructive or destructive interference
Data Source
AI summary
The present invention provides a top-emission type micro cavity OLED display device, comprising: an array substrate; a reflection metal layer arranged on the array substrate; an anode modulation layer arranged on the reflection metal layer and made of a translucent conductive material; an organic light-emitting layer arranged on the anode modulation layer and not patterned; and a cathode layer arranged on the organic light-emitting layer. The top-emission type micro cavity OLED display device comprises a plurality of sub-pixels, and the anode modulation layer is divided into a plurality of anode modulation electrodes corresponding to the plurality of sub-pixels; the plurality of sub-pixels is at least classified into a first type sub-pixel, a second type sub-pixel and a third type sub-pixel; the first to third type sub-pixels display different colors, and the anode modulation electrodes corresponding to the first to third type sub-pixels have different thicknesses.