Transparent Storage Capacitor Layout for OLED Aperture and Crosstalk
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Solution Overview
Problem
In self-luminescent display substrates, such as OLEDs, the integration of storage capacitors with light-emitting devices leads to crosstalk and reduced aperture ratios due to the large area occupied by storage capacitors, which accelerates the aging of light-emitting devices and affects display quality.
Innovation Solution
A display substrate design with a pixel driving circuit featuring parallel first and second storage capacitors, where the first electrode serves as the first storage electrode, and the second and third storage electrodes are transparent, positioned to minimize overlap with the light-emitting device, avoiding crosstalk and optimizing the light-emitting area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If storage capacitors are integrated with light-emitting devices in traditional designs, then the display substrate can maintain basic functionality, but the aperture ratio is reduced and crosstalk occurs between the storage capacitors and light-emitting devices
Solution Approach 1:
The patent transitions from a planar arrangement to a three-dimensional stacked structure. The first storage capacitor is positioned in the first plane, the light-emitting device in the second plane, and the second storage capacitor in the third plane. This vertical stacking in multiple dimensions allows each component to occupy its own spatial layer, eliminating crosstalk while maximizing the aperture ratio of the light-emitting area.
Solution Approach 2:
The patent implements a nested arrangement where the pixel driving circuit (including both storage capacitors) is integrated around the light-emitting device in a compact configuration. The first and second storage capacitors are positioned on opposite sides of the light-emitting device, creating a nested structure that optimizes space utilization without compromising the light-emitting area.
2Reliability
If storage capacitors occupy large area in traditional designs, then they can provide sufficient capacitance, but the light-emitting area is reduced and aging is accelerated
Solution Approach 1:
By stacking storage capacitors and light-emitting devices in different vertical planes, the patent decouples the area requirements of capacitors from the light-emitting area. This dimensional separation allows the light-emitting device to occupy maximum planar area while capacitors utilize the vertical space, thereby extending service life without compromising light output.
Solution Approach 2:
The patent divides the display substrate into distinct functional planes: the first plane for the first storage capacitor, the second plane for the light-emitting device, and the third plane for the second storage capacitor. This segmentation isolates the light-emitting device from the capacitive structures, reducing stress and heat accumulation that accelerate aging, while maintaining sufficient total capacitance through the parallel connection of both storage capacitors.
Data Source
AI summary
A display substrate comprises a pixel driving circuit and a bottom-emission light-emitting device that are disposed on a base and located in each sub-pixel in a display area. The light-emitting device includes a first electrode electrically connected to the pixel driving circuit. The pixel driving circuit includes a first storage capacitor and a second storage capacitor connected in parallel. The first storage capacitor includes a first storage electrode and a second storage electrode that are disposed oppositely, and the first electrode serves as the first storage electrode. The second storage capacitor includes the second storage electrode and a third storage electrode that are disposed oppositely. The second storage electrode is located between the first storage electrode and the third storage electrode. The first storage electrode is electrically connected to the third storage electrode. The first electrode, the second storage electrode, and the third storage electrode are all transparent electrodes.