Transparent Storage Capacitor Layout for High-Definition OLED Pixels
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Solution Overview
Problem
In transparent organic electroluminescence display devices, the miniaturization of pixels for high-definition displays is hindered by the need to secure a sufficient area for storage capacitors, which is challenging due to the trade-off between high image quality and transparency, making it difficult to achieve both high definition and high image quality.
Innovation Solution
A display device structure where each pixel is divided into an emission region with a light-emitting element and a transparent region with a transparent storage capacitor, allowing the storage capacitor's electrode to cover part of the transparent region, enabling the integration of a transparent storage capacitor while maintaining transparency and high image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel size is miniaturized for high-definition displays, then the resolution is improved, but the area available for storage capacitors becomes insufficient, deteriorating image quality
Solution Approach 1:
The patent places the storage capacitor in the transparent region rather than the emission region, utilizing the vertical stacking dimension. The capacitor electrode is positioned beneath the transparent region, allowing the capacitor to occupy space in the Z-direction (depth) rather than competing for lateral area in the emission region. This dimensional reorganization enables sufficient capacitor area even in miniaturized pixels.
Solution Approach 2:
The pixel is segmented into two distinct functional regions: the emission region for light output and the transparent region for capacitor placement. This spatial segmentation allows each region to be optimized independently - the emission region can be minimized for high definition while the transparent region provides dedicated space for the storage capacitor, resolving the area conflict.
2Illumination intensity
If a transparent region is secured for transparency, then the transparency is improved, but the area for storage capacitors becomes insufficient, deteriorating image quality
Solution Approach 1:
The pixel is divided into emission region and transparent region, with the storage capacitor specifically placed in the transparent region. This segmentation allows the transparent region to maintain its transparency function while simultaneously serving as the designated area for capacitor placement, eliminating the trade-off between transparency and capacitor area.
Solution Approach 2:
The transparent region serves dual functions: maintaining display transparency and housing the storage capacitor. By making the transparent region multi-functional, the patent eliminates the need to compromise either transparency or capacitor area, as both requirements are satisfied within the same spatial zone.
3Reliability
If the storage capacitor area is increased for high image quality, then the reliability is improved, but the pixel area increases, reducing definition
Solution Approach 1:
The storage capacitor is positioned in the transparent region beneath the display surface, utilizing the vertical stacking dimension. This allows the capacitor to achieve sufficient area for high image quality without increasing the lateral pixel footprint, thereby maintaining high display definition while ensuring adequate capacitor size.
Data Source
AI summary
A display device is provided including a plurality of pixels, wherein the plurality of pixels is arranged in a matrix form, wherein each of the plurality of pixels has an emission region and a transparent region, and wherein the emission region has a light-emitting element, and the transparent region has at least a part of a storage capacitor having transparency and is covered with at least one electrode of the storage capacitor, a first electrode covers the plurality of pixels, a light-emitting layer is arranged below the first electrode, a second electrode is arranged below the light-emitting layer, and the storage capacitor includes the first electrode.