OLED Electrode Layout With Variable Pitch to Reduce Diffraction
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Solution Overview
Problem
High pixel density organic EL display devices face issues with light diffraction due to high layout periodicity of first electrodes, leading to increased intensity of diffracted light.
Innovation Solution
The organic device and mask group employ a unique electrode and through-hole arrangement, where first and third color electrodes in alternating directions with varying pitches in different display regions, and through holes in masks follow similar patterns, reducing light diffraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the layout periodicity of first electrodes is increased to achieve high pixel density, then the pixel density is improved, but the intensity of diffracted light increases
Solution Approach 1:
The patent applies asymmetry by making the pitch in the first direction different from the pitch in the second direction (P1 ≠ P2). This asymmetric periodic arrangement disrupts the symmetric diffraction pattern that occurs with uniform grids, thereby reducing the intensity of diffracted light while maintaining high pixel density. The alternating arrangement of first and third color electrodes with different pitches creates an asymmetric structure that mitigates diffraction effects.
Solution Approach 2:
The patent segments the electrode array into different regions with different pitch characteristics. The first color electrodes are arranged with pitch P1 in the first direction and pitch P2 in the second direction, while the third color electrodes are arranged with pitch P3 in the first direction and pitch P4 in the second direction. This segmentation into distinct electrode groups with different periodicities helps to reduce overall diffraction intensity by breaking up the uniform periodic structure.
2Object-generated harmful factors
If alternating arrangement of first and third color electrodes is implemented, then light diffraction is reduced, but device complexity increases
Solution Approach 1:
The patent applies local quality by assigning different pitch values to different electrode types and directions. Specifically, the first color electrodes have pitch P1 in the first direction and P2 in the second direction, while the third color electrodes have pitch P3 in the first direction and P4 in the second direction. This localized variation in pitch values allows for diffraction reduction while maintaining a systematic arrangement that is manageable in terms of device complexity.
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 arrangement significantly reduces the intensity of diffracted light, enhancing display quality and efficiency.
Implementation Method 1
In a case in which layout periodicity of the first electrodes is high, there conceivably is a possibility that diffraction of light will occur, and intensity of diffracted light will increase.
Data Source
AI summary
A first color electrodes and a third color electrodes may be arrayed in an alternating manner following a first direction, and may also be arrayed in an alternating manner following a second direction that is orthogonal to the first direction. A first color electrodes that are situated in a first display region and a second display region may be arrayed at a first pitch following each of the first direction and the second direction. The first color electrodes and the third color electrodes that are situated in the second display region may be arrayed so as to alternate between a second pitch and a third pitch, following each of the first direction and the second direction. The second pitch may differ from the third pitch.