Transparent OLED Pixel Design Suppressing Light Diffraction
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Solution Overview
Problem
Transparent organic light emitting diode displays experience image distortion due to light diffraction through longitudinally formed transparent regions, which interferes with both emitted light and external light transmission.
Innovation Solution
The design incorporates a transparent region with a transparent square space occupying at least 15% to 20% of the pixel region's area, along with auxiliary transparent spaces, to minimize diffraction by ensuring a larger width of the transparent region compared to the opaque region and optimizing the ratio of transparent to opaque area within the pixel region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transparent regions are longitudinally formed with narrow width to enable light transmission, then transparency is improved, but light diffraction increases causing image distortion
Solution Approach 1:
The patent transitions from considering only the width dimension of transparent regions to incorporating the length dimension, creating a length-to-width ratio parameter. By making the transparent regions shorter in the vertical direction (reducing length while maintaining or increasing width), the patent suppresses diffraction effects while preserving light transmission functionality.
2Manufacturing precision
If transparent region width is increased to reduce diffraction, then image distortion is reduced, but the area available for opaque pixel regions decreases
Solution Approach 1:
The patent changes the geometric parameters of transparent regions by specifying a length-to-width ratio of 1:1 or less, and controlling the transparent region area to be 10-40% of the pixel region area. These parameter optimizations allow sufficient light transmission with minimal diffraction while preserving adequate area for functional pixel elements.
3Manufacturing precision
If transparent regions are made wider and shorter to suppress diffraction, then light transmission quality is improved, but the structural complexity of the display increases
Solution Approach 1:
The patent applies different geometric characteristics to different regions: transparent regions are designed with specific length-to-width ratios and area proportions, while opaque pixel regions maintain their functional structures. This localized optimization allows diffraction suppression in transparent areas without complicating the overall display structure.
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 suppresses light diffraction, reducing image distortion and maintaining effective light transmission through the display, thereby enhancing the clarity of both displayed images and external objects viewed through the display.
Implementation Method 1
Light is emitted using energy generated when excitons produced by electron-hole combinations in the organic emission layer drop from an excitation state to a ground state
Implementation Method 2
The transparent organic light emitting diode display can transmit light from an object or image located on the opposite side when the transparent organic light emitting diode display is switched off
Implementation Method 3
when the transparent regions are longitudinally formed, that is, with a length much greater than a width, and with a width of several to several tens of micrometers, light is diffracted as it passes through the transparent region
Data Source
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AI summary
An organic light emitting diode display includes: a substrate main body (111) having a plurality of pixel regions (PE), each including an opaque region and a transparent region (TW); and organic light emitting diodes (70), thin film transistors (10, 20), and conductive lines (151, 171, 172) that are formed in the opaque region of the substrate main body (111). The transparent region (TW) includes a transparent square space (RS) that has an area that is at least 15% of the entire area of the pixel region (PE).