Dual Emitting OLED Panel with Transparent Substrate

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Solution Overview

Problem

Conventional dual emitting devices with organic electroluminescent structures are bulky, complex to manufacture, and require multiple substrates and package lids, making them thick, heavy, and difficult to drive independently.

Innovation Solution

A dual emitting device with a transparent substrate featuring an array of pixels, where each pixel includes a sub-pixel driven by a thin film transistor (TFT) and a sheltering layer, using a white OLED as a light source, with independent control of light emission direction and color through a photoresist layer and external color filter, reducing the need for multiple substrates and simplifying the manufacturing process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If two separate display panels are used in conventional dual emitting devices, then independent display functions are achieved, but the device becomes larger, thicker, and heavier

Engineering Contradiction:

Improveindependent display functionVSAvoiddevice weight

Core Design Contradiction:

Adaptability or versatilityVSWeight of stationary object

Solution Approach 1:

The patent merges two separate display panels into a single integrated OLED panel with dual emission surfaces. The OLED structure emits light from both front and back surfaces simultaneously, eliminating the need for two separate panels while maintaining independent display capabilities through separate driving circuits for each surface.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The single OLED panel serves multiple functions by emitting light in two directions (front and back) simultaneously. This multi-functional design allows one panel to replace two separate panels, reducing overall device weight while maintaining the ability to display different images on each surface independently.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If two separate display panels are used in conventional dual emitting devices, then independent display functions are achieved, but the device complexity and manufacturing process become more complicated

Engineering Contradiction:

Improveindependent display functionVSAvoidmanufacturing process complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent combines two separate manufacturing processes into one by using a single OLED panel structure that can be manufactured in one continuous process. The dual emission surfaces are created during the same OLED fabrication process, eliminating the need for separate panel manufacturing and assembly operations.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If multiple package lids and substrates are used, then display protection and structure are achieved, but the device thickness increases

Engineering Contradiction:

Improvedisplay protectionVSAvoiddevice thickness

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

The patent merges multiple protective layers into a single integrated package structure. The OLED panel uses one substrate and one package lid that protects both emission surfaces, eliminating the need for separate substrates and package lids for each panel while maintaining adequate protection for both display surfaces.

Inventive Principle:

Principle #5Merging (Combining)

4Adaptability or versatility

If two separate display panels are used, then independent driving is achieved, but the manufacturing time increases

Engineering Contradiction:

Improveindependent driving capabilityVSAvoidmanufacturing speed

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent merges two separate manufacturing processes into one continuous process by fabricating both emission surfaces on a single OLED panel simultaneously. The driving circuits for both surfaces are integrated into the same manufacturing sequence, doubling the manufacturing speed while maintaining independent driving capability through separate control circuits.

Inventive Principle:

Principle #5Merging (Combining)

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 thinner, lighter dual emitting device capable of displaying different images on both sides simultaneously with reduced manufacturing complexity, using a single substrate and eliminating the need for precise shadow mask control in the evaporation process.

Implementation Method 1

The first sub-pixel comprises a first organic light emitting diode (OLED) driven by a first thin film transistor (TFT)

Methodology Applied

Scientific EffectOrganic Light-emitting Diode: Organic Light-emitting Diode

Implementation Method 2

an organic electroluminescent structure

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS7909671B2System and method for differentiating pictures and texts

Publication Date: 2011.03.22 AU OPTRONICS CORP

AI summary

A dual emitting device includes a transparent substrate and an array of pixels. The array of pixels is disposed on the transparent, and each pixel of the array includes at least one first sub-pixel and at least one second sub-pixel. The first sub-pixel includes a first OLED driven by a first TFT, and a first sheltering layer on the first OLED. The second sub-pixel includes a second OLED driven by a second TFT, and a second sheltering layer formed between the transparent substrate and the second OLED.