Reduced Capacitor Electrode Spacing in White Sub Pixel
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Solution Overview
Problem
Display devices face challenges in reducing the area of storage capacitors and improving luminance, particularly in white sub-pixels, due to the need for additional processes and moisture penetration issues associated with organic material banks.
Innovation Solution
The structure of the storage capacitor in white sub-pixels is modified by reducing the distance between capacitor electrodes and minimizing the number of insulating layers, allowing for a smaller capacitor area, increased aperture ratio, and enhanced luminance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the storage capacitor area is reduced, then the aperture ratio is improved, but the capacitance may be insufficient
Solution Approach 1:
The patent changes the physical parameters of the capacitor by reducing the distance between electrodes and minimizing insulating layers, which increases capacitance density. This allows the capacitor to maintain sufficient capacitance while occupying a smaller area, directly resolving the contradiction between area reduction and capacitance sufficiency.
Solution Approach 2:
The patent transitions from increasing capacitance through lateral area expansion to achieving higher capacitance through vertical dimension optimization by reducing electrode spacing and insulating layer thickness. This dimensional shift enables compact capacitor design without sacrificing capacitance performance.
2Area of stationary object
If the distance between capacitor electrodes is reduced, then the capacitor area is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent merges the formation of capacitor electrodes with the formation of transistor electrodes, allowing both structures to be created simultaneously in the same manufacturing process. This integration reduces the need for separate high-precision alignment steps, thereby reducing capacitor area while mitigating the increase in manufacturing precision requirements.
3Area of stationary object
If the number of insulating layers is minimized, then the capacitor area is reduced, but the electrical isolation may be compromised
Solution Approach 1:
The patent compensates for the reduced number of insulating layers by optimizing the dielectric properties and thickness of the remaining insulating layers. This parameter optimization ensures that electrical isolation performance is maintained even with fewer layers, enabling area reduction without compromising reliability.
Data Source
AI summary
A display device includes a substrate in which a plurality of sub pixels including an emission area and a circuit area is defined. The display device further includes a storage capacitor disposed in the circuit area and including a first capacitor electrode and a second capacitor electrode on the first capacitor electrode. The display device further includes a driving transistor disposed in the circuit area. The display device further includes a light emitting diode disposed in each of the plurality of sub pixels. The plurality of sub pixels includes a red sub pixel, a green sub pixel, a blue sub pixel, and a white sub pixel. And a distance between the first capacitor electrode and the second capacitor electrode in the white sub pixel is smaller than a distance between the first capacitor electrode and the second capacitor electrode in the red sub pixel, the green sub pixel, and the blue sub pixel.