Double-Sided OLED Display With Shared Cathode Layer

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Solution Overview

Problem

Current double-sided display devices are thick, heavy, and costly due to the assembly of two single display panels back-to-back, which does not meet customer demands for thinness and high cost performance.

Innovation Solution

A double-sided display device is designed with two OLED panels sharing a common cathode layer, where each panel has sequentially laminated layers including electron transport, emissive, hole transport, and anode layers, bonded via a transparent electronic adhesive layer, allowing for a lighter and thinner structure with reduced manufacturing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If two single display panels are stuck and assembled back-to-back to form a double-sided display device, then the display function is achieved, but the device becomes thicker and heavier

Engineering Contradiction:
Improvedouble-sided display functionVSAvoiddevice weight
Core Design Contradiction:
Adaptability or versatilityVSWeight of stationary object

Solution Approach 1:

The patent merges two OLED panels by making them share a common cathode layer, eliminating the need for separate cathode layers and reducing overall device thickness and weight while maintaining double-sided display functionality

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The common cathode layer serves both the first OLED panel and the second OLED panel simultaneously, making it a multi-functional component that reduces the total number of layers needed in the device

Inventive Principle:
Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If two single display panels are stuck and assembled back-to-back to form a double-sided display device, then the display function is achieved, but the device structure becomes thicker

Engineering Contradiction:
Improvedouble-sided display functionVSAvoiddevice thickness
Core Design Contradiction:
Adaptability or versatilityVSLength of stationary object

Solution Approach 1:

The patent merges two OLED panels by making them share a common cathode layer, eliminating the need for separate cathode layers and reducing overall device thickness and weight while maintaining double-sided display functionality

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The structure nests the common cathode layer to serve dual purposes for both panels, with the first and second OLED panels arranged in a nested configuration around the shared cathode layer

Inventive Principle:
Principle #7Nested doll (Nesting)

3Adaptability or versatility

If two single display panels are stuck and assembled back-to-back to form a double-sided display device, then the display function is achieved, but the manufacturing cost increases

Engineering Contradiction:
Improvedouble-sided display functionVSAvoidmanufacturing cost
Core Design Contradiction:
Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent merges two OLED panels by making them share a common cathode layer, eliminating the need for separate cathode layers and reducing overall device thickness and weight while maintaining double-sided display functionality

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The common cathode layer serves both the first OLED panel and the second OLED panel simultaneously, making it a multi-functional component that reduces the total number of layers needed in the device

Inventive Principle:
Principle #6Universality (Multi-functionality)

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 results in a lighter, thinner double-sided display device with a simplified manufacturing process and lower costs, meeting customer requirements for thinness and cost performance.

Implementation Method 1

the third electron transport layer and the fourth electron transport layer are bonded to each other via a transparent electronic adhesive layer

Methodology Applied
Scientific EffectAdhesion: Adhesive

Data Source

PatentUS10403702B2Double-sided display device, manufacturing method thereof, and electronic apparatus
Publication Date: 2019.09.03 WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO LTD
  • US10403702B2 patent drawing
  • US10403702B2 patent drawing
  • US10403702B2 patent drawing

AI summary

The present disclosure provides a double-sided display device which includes a first OLED display panel and a second OLED display panel, of which display surfaces are disposed facing away from each other, wherein the first and second OLED display panels have a common shared cathode layer; the first OLED display panel includes a first electron transport layer, a first emissive layer, a first hole transport layer, a first anode layer and a first array substrate that are sequentially laminated on a first surface of the shared cathode layer; and the second OLED display panel includes a second electron transport layer, a second emissive layer, a second hole transport layer, a second anode layer and a second array substrate that are sequentially laminated on a second surface of the shared cathode layer. The present disclosure further provides a manufacturing method of the double-sided display device as mentioned above. In comparison with the prior art, the present disclosure obtains a lighter and thinner double-sided display device.