Transparent Micro LED Display With Integrated Capacitor Structure
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Solution Overview
Problem
Existing display devices, such as liquid-crystal displays and organic light-emitting displays, face issues with thickness, flexibility, luminance, response speed, and vulnerability to moisture and oxygen, which are addressed by using LED display devices with integrated capacitors and micro LEDs.
Innovation Solution
A transparent LED display device is designed with a capacitor-integrated LED structure that includes a first and second capacitor electrode, a capacitor dielectric layer, a p-type and n-type layer, and a pixel-driving circuit comprising switching, driving, and sensing thin-film transistors, all disposed on a substrate with insulating layers to reduce the pixel-driving circuit area and increase the transmission area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a backlight unit is added to illuminate light in liquid-crystal display devices, then visibility is improved, but thickness increases
Solution Approach 1:
The patent combines the capacitor and LED into a single integrated structure where the capacitor serves both as an electrical component and as part of the LED assembly. This merging eliminates the need for separate backlight units while maintaining display functionality through the self-luminous property of LEDs.
Solution Approach 2:
The LED display device uses self-luminous LEDs that generate their own light without requiring external backlight units. The integrated capacitor provides necessary electrical functions directly within the LED structure, making the system self-sufficient and eliminating additional light-source components that would increase thickness.
2Length of stationary object
If organic material is used as active layer in light-emitting display devices, then flexibility and thinness are improved, but reliability deteriorates due to moisture and oxygen permeation
Solution Approach 1:
The patent transitions from organic materials to inorganic semiconductor materials for the LED active layer. This material parameter change fundamentally improves reliability by eliminating susceptibility to moisture and oxygen permeation, while maintaining the thin and flexible form factor through advanced semiconductor fabrication techniques.
3Area of stationary object
If capacitor and LED are integrated into single structure, then area is reduced, but manufacturing complexity increases
Solution Approach 1:
The integrated capacitor-LED structure is fabricated using segmented processing steps that follow standard semiconductor manufacturing sequences. The capacitor layers are formed in distinct stages alongside the LED structure, allowing each component to be optimized independently while achieving integration, thereby managing manufacturing complexity through systematic segmentation of the fabrication process.
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
The solution enhances transmittance, aperture ratio, and reliability by integrating capacitors into LEDs, improving luminance and reducing the need for a backlight unit, while maintaining high-definition image display.
Implementation Method 1
a first capacitor electrode, a capacitor dielectric layer, a second capacitor electrode... Among these, the first capacitor electrode, the second capacitor electrode and the capacitor dielectric layer can form the capacitor
Implementation Method 2
an LED display device using light-emitting diodes (LEDs) as light-emitting elements... a mini- or micro-sized ultra-small LED using an inorganic material as a light-emitting element
Implementation Method 3
A liquid-crystal display device is not a self-luminous device and thus requires a backlight unit... On the other hand, a display device having a self-luminous element can be made thinner
Data Source
AI summary
Discussed herein is a transparent light emitting diode (LED) display device. A capacitor of a pixel-driving circuit is integrated with an LED, and thus that the area of the pixel-driving circuit is reduced, and the transmission area is increased. In this manner, it is possible to achieve high transmittance without compromising the display quality.