Transparent OLED Pixel Arrangement for Transmittance
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Solution Overview
Problem
Conventional transparent organic light emitting diode displays face challenges in achieving a balance between high transmittance and light emission aperture ratio, often compromising on one aspect due to the design of transmission window areas and pixel arrangements.
Innovation Solution
The display features a matrix arrangement of quadrangular transmission window areas covering 45% of the screen, with green, red, and blue pixels arranged differently in horizontal and vertical lines, and specific line and power line configurations to optimize transmittance and light emission, ensuring a 30% transmittance and 25% light emission aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transmission window areas are increased to improve transmittance, then transmittance is improved, but light emission aperture ratio deteriorates
Solution Approach 1:
The display area is segmented into transmission window areas and pixel areas, with further segmentation of pixel areas into sub-pixels of different colors. This allows optimization of each segment's function: transmission windows maximize light passage while pixel areas concentrate light emission, resolving the contradiction between overall transmittance and light emission aperture ratio
Solution Approach 2:
Different areas of the display have different optical properties: transmission window areas are designed for high transmittance while pixel areas are designed for light emission. The green pixels use different emission wavelengths than red and blue pixels, creating local quality differences that optimize both transmittance and light emission performance simultaneously
2Illumination intensity
If green pixels are arranged in horizontal lines and red/blue pixels in vertical lines, then transmittance is improved, but manufacturing complexity increases
Solution Approach 1:
The pixel array is segmented into different directional arrangements: green pixels arranged horizontally and red/blue pixels arranged vertically. This segmentation allows each group to be optimized for its specific function while maintaining overall manufacturing feasibility through systematic patterning
Solution Approach 2:
The display employs asymmetric pixel arrangement where green pixels are oriented differently from red and blue pixels. This asymmetric design optimizes optical performance by aligning pixel orientations with their respective emission characteristics, while the systematic nature of the asymmetry keeps manufacturing complexity manageable
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 ensures good transmittance and light emission aperture ratios, enhancing the overall performance of the transparent organic light emitting diode display by maintaining a balance between viewing through the display and effective light emission.
Implementation Method 1
The light is emitted by energy generated when an exciton, generated when an electron and a hole are coupled with each other in an organic emission layer of the organic light emitting diode, falls down from an excited state to a ground state.
Data Source
AI summary
An organic light emitting diode display includes a plurality of transmission window areas arranged in a matrix form, a plurality of green pixels arranged in a plurality of horizontal line areas among the plurality of transmission window areas, and a plurality of red pixels and a plurality of blue pixels arranged in a plurality of vertical line areas among the plurality of transmission window areas.