OLED Display Transmissive Film Destructive Interference
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Solution Overview
Problem
Conventional OLED displays suffer from reduced display characteristics due to external light reflection, which affects black representation and contrast.
Innovation Solution
The OLED display incorporates a transmissive film between two common electrodes, with light scattering spacer parts in the pixel defining layer that maintain a gap between the substrate and sealing member, and are formed using semi-transmissive metals like magnesium, silver, or aluminum, to suppress external light reflection through destructive interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional OLED displays use transparent electrodes and metal wires, then the display can be manufactured with standard processes, but external light reflection occurs which reduces display characteristics
Solution Approach 1:
The patent converts the harmful effect of external light reflection into a beneficial effect by using the reflected light to interfere destructively with incoming external light. The metal wire and transparent electrode structure, which originally caused harmful reflection, is designed to create destructive interference that suppresses external light reflection and improves display characteristics.
Solution Approach 2:
The patent changes the optical parameters of the electrode structure by controlling the thickness, refractive index, and material composition of the transparent electrode and metal wire layers. By adjusting these parameters, the structure achieves destructive interference for external light while maintaining electrical functionality and manufacturability.
2Object-affected harmful factors
If a transmissive film is added between common electrodes to suppress external light reflection, then display characteristics improve, but device complexity increases
Solution Approach 1:
The patent makes the transparent electrode serve multiple functions: it provides electrical conductivity for the OLED operation and simultaneously acts as an optical interference layer to suppress external light reflection. This multi-functionality reduces the need for separate anti-reflection structures, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent merges the electrical electrode function with the optical anti-reflection function into a single integrated structure. The transparent electrode and metal wire are designed to work together as both electrical conductors and optical interference elements, combining multiple functions into unified components.
3Object-affected harmful factors
If light scattering spacer parts are used to maintain gap between substrate and sealing member, then external light reflection is suppressed, but manufacturing precision requirements increase
Solution Approach 1:
The light scattering spacer parts are designed to automatically maintain the gap between the substrate and sealing member through their own structural properties. The spacers self-align and self-position during assembly, using their geometric shape and light scattering characteristics to ensure proper gap maintenance without requiring high-precision external alignment processes.
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 effectively reduces external light reflection, enhancing display properties such as contrast and image quality by minimizing light scattering and voltage drops between electrodes.
Implementation Method 1
suppress external light reflection through destructive interference
Implementation Method 2
light scattering spacer parts in the pixel defining layer
Data Source
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AI summary
An OLED display includes a substrate member (111), a plurality of pixel electrodes (710) on the substrate member (111), a pixel defining layer (190) on the substrate member, the pixel defining layer (190) including a pixel defining part (191) and a plurality of light scattering spacer parts (195), the pixel defining part (191) including a plurality of openings corresponding to and exposing the pixel electrodes (710), and the light scattering spacer parts (195) protruding upward from the pixel defining part (191) away from the substrate member (111), an organic light emitting layer (720) on the pixel electrodes (710), a first common electrode (730) on the organic light emitting layer (720), at least a portion of the first common electrode (730) being on the pixel defining layer (190) to overlap the light scattering spacer parts (195), a transmissive film (600) on the first common electrode (730), and a second common electrode (750) on the transmissive film (600).