Double-Sided OLED Panel With Inverted Electrode Configurations
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing OLED display devices are limited to single-sided light emission, lacking the capability to emit light from both sides, which restricts their functionality as double-sided display devices.
Innovation Solution
A double-sided display panel design featuring a substrate with both first and second light-emitting elements, where the first light-emitting elements emit light through a transparent anode and reflective cathode from the bottom surface, and the second light-emitting elements emit light through a reflective anode and transparent cathode from the top surface, driven by a specialized driving circuit that controls the light emission from both sides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If OLED display devices use conventional single-sided light emission structure, then the device structure remains simple, but the display functionality is limited to one side only
Solution Approach 1:
The display device is segmented into two independent light-emitting systems: first light-emitting elements for bottom emission and second light-emitting elements for top emission. Each set of elements has its own light-emitting layer, electrodes, and driving circuit, allowing independent operation and enabling true double-sided display functionality without interfering with each other
Solution Approach 2:
The invention transitions from single-sided (one-dimensional display) to double-sided (two-dimensional display) by adding light-emitting elements on both the top and bottom surfaces of the substrate. This dimensional expansion allows information to be displayed on both faces of the device simultaneously
2Use of energy by moving object
If light-emitting elements are configured with transparent and reflective electrodes for dual-sided emission, then light energy emission from both sides is improved, but the manufacturing process becomes more complex
Solution Approach 1:
Different electrode configurations are applied to different light-emitting elements based on their emission direction requirements. First light-emitting elements use transparent anodes and reflective cathodes for bottom emission, while second light-emitting elements use reflective anodes and transparent cathodes for top emission. This localized differentiation optimizes light extraction efficiency for each emission direction
Solution Approach 2:
The electrode configurations are inverted between the two sets of light-emitting elements. Where the first elements have transparent anodes and reflective cathodes, the second elements have reflective anodes and transparent cathodes. This inversion allows both sides to achieve optimal light emission through symmetric design
3Ease of operation
If driving circuits are added to control both first and second light-emitting elements, then double-sided display control capability is improved, but the overall device complexity increases
Solution Approach 1:
The driving circuits are designed with multi-functionality to control both first and second light-emitting elements. The control circuit can selectively activate either the first driving circuit or the second driving circuit, or both simultaneously, providing versatile control capabilities for various display modes including single-sided display, double-sided display, and half-half display
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
Enables a double-sided display with improved light energy emission from both sides, achieving a simple structure and effective display performance, allowing for various display configurations and applications.
Implementation Method 1
the first anode comprises a first transparent conductive material... so that the first light emitted by the first light-emitting layer transmits out of the first light-emitting surface
Implementation Method 2
the first cathode comprises a first reflecting conductive material... so that the first light emitted by the first light-emitting layer transmits out of the first light-emitting surface
Implementation Method 3
the second cathode comprises a second transparent conductive material... so that the second light emitted by the second light-emitting layer transmits out of the second light-emitting surface
Implementation Method 4
the second anode comprises a second reflecting conductive material... so that the second light emitted by the second light-emitting layer transmits out of the second light-emitting surface
Implementation Method 5
Each of the plurality of display elements comprises at least one first light-emitting element and at least one second light-emitting element... configured to respectively emit a first light... and a second light
Data Source
AI summary
A display panel includes a plurality of display elements over a substrate, each including at least one first light-emitting element for emitting a first light out of a first light-emitting surface and at least one second light-emitting element for emitting a second light out of a second light-emitting surface opposing to the first light-emitting surface. Each first light-emitting element has a first light-emitting layer between two first electrodes, which are respectively transparent and reflective so that the first light can transmit out of the first light-emitting surface. Each second light-emitting element includes a second light-emitting layer between two second electrodes, which are respectively transparent and reflective so that the second light transmits out of the second light-emitting surface. The first and second light-emitting surface are below and over the substrate respectively. A driving circuit is configured to drive the display panel.