Transparent Electrode Storage Capacitor for Display Light Emission
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Solution Overview
Problem
In display apparatuses, the effective emission region of each pixel area is reduced due to light emitted from the light-emitting device being partially blocked by the driving circuit, leading to a decrease in image quality on the outer surface of the device substrate.
Innovation Solution
A display apparatus is designed with a device substrate that defines a main-emission region and a sub-emission region for each pixel area, where the driving circuit is spaced away from the main-emission region and includes a storage capacitor with a stacked structure of capacitor electrodes, and the light-emitting device overlaps with both regions, utilizing transparent electrodes and insulating layers to maximize light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the driving circuit is disposed in each pixel area to control the light-emitting device, then the light-emitting device can be electrically connected and controlled, but the driving circuit blocks part of the emitted light, reducing the effective emission region and image quality
Solution Approach 1:
The patent transitions from a planar arrangement where the driving circuit and light-emitting device share the same two-dimensional pixel area to a three-dimensional stacked structure. The driving circuit is positioned on the first substrate while the light-emitting device is disposed on a second substrate above it, separated by a predetermined distance. This vertical separation allows light to pass through the driving circuit region without blockage, effectively increasing the emission region while maintaining electrical connection through vertical conductive structures.
Solution Approach 2:
The patent implements a nested structure where the light-emitting device is positioned within the vertical space above the driving circuit, with the driving circuit's conductive structures extending upward to connect with the light-emitting device. The encapsulation structure further nests both components while providing protection and maintaining the spatial separation needed for light transmission.
2Device complexity
If the driving circuit is placed close to the light-emitting device to reduce space, then device integration is improved, but light transmission is blocked and image quality decreases
Solution Approach 1:
The patent resolves the conflict between integration and light transmission by moving from horizontal proximity to vertical stacking. The driving circuit and light-emitting device are integrated through vertical electrical connections while maintaining horizontal separation for light transmission. The predetermined distance between substrates ensures light can pass through the driving circuit region without significant blockage.
Solution Approach 2:
The patent introduces intermediate structures including the encapsulation structure and conductive connections that extend through insulating layers. These intermediaries facilitate electrical connection between the driving circuit and light-emitting device while allowing light to pass through the spaces between these structures, thus maintaining both integration and light transmission.
3Illumination intensity
If transparent electrodes are used in the driving circuit to improve light transmission, then material transparency is increased, but electrode conductivity may be reduced
Solution Approach 1:
The patent employs composite electrode structures combining transparent conductive materials (such as ITO or IZO) with traditional conductive materials. The transparent conductive oxide layers provide light transmission while maintaining electrical conductivity, and are often stacked or combined with metal layers to achieve both optical and electrical performance requirements.
Solution Approach 2:
The patent optimizes the thickness and composition parameters of transparent conductive oxide layers to balance transparency and conductivity. By controlling the thickness of ITO or IZO layers and adjusting their composition ratios, the patent achieves sufficient light transmission while maintaining adequate electrical conductivity for driving circuit operation.
Data Source
AI summary
A display apparatus comprising a driving circuit that includes a storage capacitor and at least one thin film transistor, and a light-emitting device that includes a region disposed outside the driving circuit and a region overlapping with the storage capacitor, each of capacitor electrodes of the storage capacitor being a transparent electrode having a relatively higher transmittance, so that the quality of the image realized on an outer surface of a device substrate which supports the driving circuit and the light-emitting device of each pixel area can be improved.