Double-Sided OLED Panel With Shared Gate Electrode

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Solution Overview

Problem

Conventional double-sided display panels suffer from synchronization abnormalities, high manufacturing costs, and large thickness, making them unsuitable for light and thin designs.

Innovation Solution

A double-sided display panel is designed with a shared gate electrode for switch TFTs between organic light-emitting layers on both sides, integrated on a flexible substrate, reducing complexity and thickness, and using packaging layers with inorganic and organic films for enhanced performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If two separate display panels are assembled together to achieve double-sided display, then double-sided display function is achieved, but device complexity and thickness increase

Engineering Contradiction:

Improvedouble-sided display functionVSAvoidinternal structure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges two separate display panels into a single integrated structure by stacking organic light-emitting layers on both sides of one substrate. The first organic light-emitting layer is arranged at a first side of the substrate, and the second organic light-emitting layer is at least partially arranged at a second side of the substrate, achieving double-sided display without assembling two separate panels.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The gate electrode of the first switch TFT is multiplexed to serve as the gate electrode of the second switch TFT as well. This multi-functional design allows a single gate electrode to control both the first organic light-emitting layer and the second organic light-emitting layer, reducing the number of components and simplifying the driving system.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If two separate display panels are assembled together, then double-sided display is achieved, but thickness and volume increase

Engineering Contradiction:

Improvedouble-sided display functionVSAvoidpanel thickness

Core Design Contradiction:

Adaptability or versatilityVSLength of stationary object

Solution Approach 1:

By combining two display functions into one integrated panel structure with organic light-emitting layers on both sides of a single substrate, the patent eliminates the need for two separate panels and their associated spacing, connection structures, and support frames, thereby significantly reducing overall thickness and volume.

Inventive Principle:

Principle #5Merging (Combining)

3Adaptability or versatility

If two separate display panels are assembled together, then double-sided display is achieved, but manufacturing cost increases

Engineering Contradiction:

Improvedouble-sided display functionVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The integrated structure allows both organic light-emitting layers to be manufactured in the same production line using the same substrate and similar fabrication processes, eliminating the need for two separate manufacturing lines and reducing overall manufacturing costs compared to assembling two separate display panels.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The multiplexed gate electrode reduces the number of TFTs and associated materials needed, simplifying the manufacturing process and reducing material costs while maintaining the ability to drive both display sides independently.

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Adaptability or versatility

If two separate display panels are assembled together, then double-sided display is achieved, but power consumption increases

Engineering Contradiction:

Improvedouble-sided display functionVSAvoidpower consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by stationary object

Solution Approach 1:

The multiplexed gate electrode allows both organic light-emitting layers to share a common control signal path, enabling synchronized operation and reducing the total power consumption compared to two independent display panels that would require separate driving systems.

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

This solution achieves synchronization, reduces manufacturing costs and power consumption, simplifies design, and improves yield and display quality, enabling the production of thinner, more efficient double-sided display panels.

Implementation Method 1

a first organic light-emitting layer for front-side display; a second organic light-emitting layer for back-side display

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS10665659B2Double-sided display panel, manufacturing method thereof and display device

Publication Date: 2020.05.26 BOE TECHNOLOGY GROUP CO LTD

AI summary

The double-sided display panel according to embodiments of the present disclosure includes: a first organic light-emitting layer for front-side display; a second organic light-emitting layer for back-side display; a first switch TFT configured to enable the first organic light-emitting layer to emit light; and a second switch TFT configured to enable the second organic light-emitting layer to emit light. A gate electrode of the first switch TFT is multiplexed as, or connected to, a gate electrode of the second switch TFT.