OLED Display Pixel Transparency Area Variation
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Solution Overview
Problem
OLED displays face challenges in achieving clear external image visibility due to constructive interference of light diffracted by the second regions of pixels, which are not randomly defined, leading to reduced image clarity.
Innovation Solution
The OLED display design includes a substrate with pixels having a first region for light emission and a second region for transmitting external light, where the second regions of adjacent pixels have different areas, and the second regions are formed with a combination of transparent and opaque wiring materials, such as indium tin oxide, indium zinc oxide, carbon nanotubes, or graphene, to reduce constructive interference by increasing the randomness of their areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the second regions of pixels are formed with uniform areas, then the manufacturing process is simplified, but constructive interference of diffracted light occurs reducing external image clarity
Solution Approach 1:
The patent applies asymmetry by making the second regions of adjacent pixels have different areas rather than uniform areas. This asymmetric design disrupts the periodic structure that causes constructive interference of diffracted light, thereby improving external image clarity while maintaining manufacturing feasibility through defined area variations.
Solution Approach 2:
The patent changes the parameter of the second region area from uniform to variable. By varying the area of the second region in adjacent pixels, the optical interference pattern is altered to reduce constructive interference, thus improving external image visibility while keeping the manufacturing process manageable through controlled parameter variation.
2Illumination intensity
If transparent wiring materials are used in the second region, then external light transmission is improved, but light diffraction and constructive interference occur reducing image clarity
Solution Approach 1:
The patent uses asymmetry in the area design of the second region to disrupt the periodic arrangement that causes constructive interference. By creating non-uniform patterns in the transparent wiring regions, external light transmission is maintained while the asymmetric structure reduces coherent diffraction effects that degrade image clarity.
Solution Approach 2:
The patent applies local quality by varying the area of the second region in different pixel locations. This local variation in the transparent wiring material distribution allows external light transmission in each region while the overall non-uniform pattern reduces constructive interference across the display, improving external image clarity.
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 design enhances the clarity of external images viewed through the OLED display by minimizing constructive interference of diffracted light, thereby improving the overall visibility and clarity of images.
Implementation Method 1
The OLED emits light when excitons generated via recombination of holes injected from the hole injecting electrode and electrons injected from the electron injecting electrode in the organic emission layer drop from an excited state to a ground state
Implementation Method 2
a second region transmitting external light
Implementation Method 3
constructive interference of light diffracted by the second regions of pixels
Data Source
AI summary
An organic light-emitting diode (OLED) display is disclosed. In one aspect, the display includes a substrate and a plurality of pixels formed over the substrate. Each of the pixels comprises a first region configured to emit light and a second region configured to pass external light therethrough. The second regions of at least three adjacent ones of the pixels have different areas.