Transparent Electrode Storage Capacitor for OLED Aperture Ratio
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Solution Overview
Problem
Conventional bottom-emitting OLED display panels face low aperture ratios and electrical defects due to opaque metal in capacitors, which reduces yield and causes short circuits, as light cannot penetrate through the driving circuit layers.
Innovation Solution
A display panel design where a transparent source/drain electrode layer is used, allowing light to penetrate and positioning the storage capacitor directly under the light emitting structure, with a transparent anode and reflective cathode, and an indium gallium zinc oxide active area, increasing the aperture ratio and avoiding electrical defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If opaque metal is used in the storage capacitor area, then the capacitor can be formed with conventional materials, but light cannot penetrate through the driving circuit layers, reducing the aperture ratio
Solution Approach 1:
The patent changes the optical parameter (transparency) of the electrode material from opaque to transparent. Specifically, it uses transparent conducting oxides (such as ITO, IZO, or TCO) instead of conventional opaque metals for the source/drain electrode layer, allowing light to pass through while maintaining electrical functionality of the capacitor.
2Device complexity
If pixel patterns are concentrated in a small space, then the device integration is achieved, but it is easy to cause short circuit, open circuit, and other electrical defects, reducing product yield
Solution Approach 1:
The patent segments the electrode structure into multiple transparent conducting oxide layers with different orientations. The first source/drain electrode layer has a first orientation while the second source/drain electrode layer has a second orientation different from the first, which distributes the electrical pathways and reduces the risk of concentrated defects causing circuit failures.
3Area of stationary object
If a transparent source/drain electrode layer is used, then light can penetrate and aperture ratio increases, but the electrode material selection is restricted
Solution Approach 1:
The patent employs composite material structures using transparent conducting oxides. It uses a first source/drain electrode layer and a second source/drain electrode layer, both made of transparent conducting oxide materials (such as ITO, IZO, or TCO), which combine optical transparency with electrical conductivity, overcoming the limitation of material selection while achieving light penetration.
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 design enhances the aperture ratio of the 3T1C pixel driving circuit, increases the layout area of the thin film transistor, and reduces electrical defects, thereby improving product yield.
Implementation Method 1
a source/drain electrode layer (36), wherein the source/drain electrode layer (36) is a transparent electrode
Implementation Method 2
a cathode, wherein the cathode is a reflective electrode
Data Source
AI summary
A display panel and a method of manufacturing of the same are provided. The display panel includes a storage capacitor and a light emitting structure. The light emitting structure is disposed above the storage capacitor, and a light emitting surface of the light emitting structure faces the storage capacitor. A first plate of the storage capacitor includes an anode and an active area electrically connected with each other, and a second plate of the storage capacitor includes a source/drain electrode layer, and the source/drain electrode layer is a transparent electrode.