Transparent Capacitor Electrodes for High Transmittance Displays
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Solution Overview
Problem
Transparent display devices face a limitation in transmittance due to the increasing size of capacitors in smaller organic light emitting display devices, leading to a higher area ratio of the driving part to the pixel, which reduces the overall transmittance.
Innovation Solution
The use of transparent conductive materials for the electrodes of the capacitor, allowing them to overlap with an insulation layer, thereby reducing the area of the driving part and increasing the transmissive area, enhancing the transmittance of the display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the size of each pixel is reduced to achieve high resolution, then the resolution is improved, but the area ratio of the capacitor to the pixel increases, leading to reduced transmittance
Solution Approach 1:
The capacitor electrodes are arranged in an overlapping configuration where the first electrode extends in a first direction and the second electrode extends in a second direction perpendicular to the first direction. This orthogonal arrangement allows the capacitor to occupy less planar area within each pixel, reducing the area ratio of the driving part while maintaining capacitance functionality, thereby improving transmittance without sacrificing resolution.
2Illumination intensity
If the area of the driving part is reduced to increase transmittance, then the transmittance is improved, but the capacitor area must be reduced which limits the resolution improvement
Solution Approach 1:
By arranging the capacitor electrodes in perpendicular directions with an overlapping configuration, the invention reduces the planar footprint of the capacitor within the pixel area. This allows the driving part to occupy less area, thereby increasing the transmissive area and improving transmittance while maintaining the ability to achieve high resolution through smaller pixel dimensions.
3Reliability
If opaque conductive material is used in the driving part, then the electrical conductivity is improved, but the transmittance of the transparent display device is reduced
Solution Approach 1:
The capacitor electrodes are configured to overlap with each other in a specific arrangement where the first electrode extends in a first direction and the second electrode extends in a second direction perpendicular to the first direction. This localized overlapping structure minimizes the total area occupied by opaque conductive materials while ensuring adequate electrical conductivity for capacitor operation, thereby balancing electrical performance with optical transmittance.
Data Source
AI summary
Disclosed are a display device and a method of manufacturing the same. The display device includes a light emitting device including an anode electrode, a light emitting layer, and a cathode electrode, a driving transistor configured to supply a driving current to the light emitting device, and a capacitor including one electrode and other electrode each formed of a transparent conductive material. The one electrode and the other electrode of the capacitor overlap each other with at least one insulation layer therebetween.