OLED Storage Capacitor Transparent Electrode Aperture Rate
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Solution Overview
Problem
In conventional active matrix organic light emitting diode (AMOLED) displays, the storage capacitor's low capacitance and light reflection issues due to metal electrodes reduce the lighting area and affect display performance.
Innovation Solution
The use of transparent electrodes for the storage capacitor, combined with a light blocking layer and an amorphous oxide semiconductor, increases capacitance and prevents light reflection, enhancing the display's aperture rate and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If metal electrodes are used for the storage capacitor, then the capacitance is sufficient, but the lighting area is reduced and light reflection occurs
Solution Approach 1:
The patent changes the material parameter of the capacitor electrodes from metal to transparent conducting material (such as ITO or IZO), which fundamentally alters both the optical properties (transparency) and electrical properties (conductivity) of the electrode layer, enabling simultaneous achievement of high capacitance and high aperture ratio
Solution Approach 2:
The patent employs composite material structures including transparent conducting oxide layers combined with organic buffer layers and color resistor layers, creating a multi-layer composite structure that integrates electrical functionality with optical transparency and color filtering capabilities
2Object-affected harmful factors
If a light blocking layer is added to block light, then light reflection is reduced, but the aperture rate is reduced
Solution Approach 1:
The patent converts the harmful light reflection from metal electrodes into a beneficial feature by using transparent conducting materials that allow light transmission, thereby eliminating the need for light blocking layers and simultaneously maintaining both low reflection and high aperture rate
Solution Approach 2:
The patent extracts and removes the light blocking layer from the display structure by replacing metal electrodes with transparent conducting materials, thereby eliminating the need for additional light blocking components and increasing the effective aperture area
Data Source
AI summary
An OLED display includes: a color resistor layer, a buffer layer covering the color resistor layer, a transistor having a transparent conductive layer, a gate metal layer, and an output electrode, a pixel electrode, and a storage capacitor having a first transparent electrode and a second transparent electrode. The pixel electrode is the second transparent electrode, a projected area of the first transparent electrode on the substrate is larger than or equal to a projected area of the color resistor layer on the substrate. The upper electrode and lower electrode of the storage capacitor are replaced with a transparent material to raise the aperture rate. The gate insulating layer is used in the capacitor area to increase the capacitance. The storage capacitor adopts the transparent electrodes to solve the issues of low capacitance of the storage capacitor and the unstable components caused by the reflected light.