Asymmetrical Transparent Regions in OLED Displays
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Solution Overview
Problem
Conventional transparent organic light emitting display devices suffer from image distortion due to diffraction interference caused by regularly arranged transparent regions, which reduces image quality when the device is in the ON state.
Innovation Solution
The organic light emitting display device features a substrate with pixel and transparent regions arranged in an asymmetrical configuration, utilizing a black matrix or pixel defining layer to partially define the transparent regions, thereby reducing the periodicity of their shapes and minimizing diffraction interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If transparent regions are arranged with constant gap in conventional display devices, then manufacturing is simplified and transparency is achieved, but diffraction interference occurs causing image distortion
Solution Approach 1:
The patent applies asymmetry by configuring transparent regions with different widths on opposite sides of the pixel region. Specifically, the first transparent region has a first width and the second transparent region has a second width that is different from the first width, breaking the periodic symmetry that causes diffraction interference while maintaining the transparency function
Solution Approach 2:
The patent implements local quality by making each transparent region have non-uniform width characteristics. The transparent regions are designed with different local dimensions (first width vs. second width) to prevent uniform diffraction patterns, allowing each region to contribute to transparency without creating harmful interference patterns
2Stability of the object's composition
If transparent regions are repeatedly arranged with constant gap, then structural regularity is achieved, but diffraction interference distorts images viewed through the device
Solution Approach 1:
The patent breaks structural regularity by introducing asymmetrical transparent region configurations. The first transparent region and second transparent region have different widths, eliminating the repetitive constant-gap pattern that causes diffraction interference and preserves image information quality
3Manufacturing precision
If symmetrical transparent regions are used, then manufacturing precision is easier to maintain, but diffraction interference reduces image quality in pixel regions
Solution Approach 1:
The patent deliberately introduces asymmetry in transparent region widths to prevent diffraction interference. The first width and second width are intentionally made different, sacrificing symmetrical manufacturing simplicity to achieve superior image quality by eliminating interference patterns
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 prevents image distortion when the device is in the OFF state and enhances image quality in the pixel regions when in the ON state by suppressing diffraction interference.
Implementation Method 1
The multiple slits may cause diffraction interference of a light passing therethrough, so that the image of the object viewed through the conventional transparent organic light emitting display device may be distorted
Data Source
AI summary
An organic light emitting display device includes a substrate including a plurality of pixel regions and a plurality of transparent regions, thin film transistors disposed in the pixel regions, an insulation layer disposed on the thin film transistors, first electrodes electrically contacting the thin film transistors, a pixel defining layer including a black material disposed on the first electrodes, organic light emitting structures disposed on the pixel defining layer, and a second electrode disposed on the organic light emitting structures. The pixel defining layer may define an asymmetrical configuration of adjacent transparent regions disposed on opposing sides of corresponding pixel regions.