Dual-Emission OLED Common Electrode Structure
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Solution Overview
Problem
Dual-emission organic light-emitting display devices face challenges in manufacturing costs and image inversion issues when trying to emit light on both front and back sides using separate panels or a single panel with reversed images.
Innovation Solution
An organic light-emitting diode structure with a common electrode between two organic layers, allowing for dual emission by varying the power voltages applied to the electrodes, enabling the layers to alternately emit light towards either side, thus achieving simultaneous or different images on the front and back sides without image inversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two separate panels are manufactured and attached to each other to achieve dual emission, then light emission on both front and back sides is enabled, but manufacturing costs increase and device thickness increases
Solution Approach 1:
The patent merges two separate panel structures into a single integrated OLED panel with a symmetric multi-layer structure. The device combines front and back emission functionalities in one panel by using a common electrode and two organic light-emitting layers oriented in opposite directions, eliminating the need to manufacture and attach two separate panels while reducing manufacturing complexity and cost
Solution Approach 2:
The single OLED panel is designed to perform multiple functions simultaneously - it can emit light in both front and back directions, and can display different images on each side. The symmetric structure with controllable organic layers enables the device to function as both a front-emitting and back-emitting display in one unified structure
2Adaptability or versatility
If two separate panels are manufactured and attached to each other to achieve dual emission, then light emission on both front and back sides is enabled, but device thickness increases
Solution Approach 1:
The patent merges two separate panel structures into a single integrated OLED panel with a symmetric multi-layer structure. The device combines front and back emission functionalities in one panel by using a common electrode and two organic light-emitting layers oriented in opposite directions, eliminating the need to manufacture and attach two separate panels while reducing manufacturing complexity and cost
3Ease of manufacture
If a single panel is used to emit light on both sides, then manufacturing cost is reduced, but image inversion occurs on front and back sides
Solution Approach 1:
The patent employs a symmetric structure design where the OLED contains two organic light-emitting layers with complementary orientations - one layer is optimized for front emission and the other for back emission. This symmetric asymmetric design (symmetric in structure, asymmetric in function) allows each side to display correct non-inverted images while maintaining cost-effective single-panel manufacturing
Solution Approach 2:
The patent addresses image inversion by using two differently oriented organic light-emitting layers that emit light in opposite directions. The front-emitting layer and back-emitting layer are configured with opposite orientations, so that when voltage is applied, the front side displays the correct image orientation while the back side also displays the correct image orientation, effectively compensating for the inversion issue through dual-layer design
4Ease of manufacture
If a single panel is used to emit light on both sides, then manufacturing complexity is reduced, but control of light emission direction becomes more difficult
Solution Approach 1:
The patent implements dynamic control of light emission direction by applying different voltages to the common electrode and the two outer electrodes. By dynamically adjusting the voltage polarity and magnitude, the device can selectively activate the front-emitting organic layer, the back-emitting organic layer, or both layers simultaneously, enabling flexible control over emission direction and dual-image display modes
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 allows for efficient dual emission in each pixel without image inversion, reducing manufacturing costs and complexity by using a single panel with a common electrode to control light emission directions, enhancing display performance and cost-effectiveness.
Implementation Method 1
organic light-emitting diode including: a first electrode and a second electrode facing each other; a common electrode interposed between the first electrode and the second electrode; a first organic layer interposed between the first electrode and the common electrode; and a second organic layer that is interposed between the second electrode and the common electrode
Data Source
AI summary
An organic light-emitting diode, an organic light-emitting display device including the same, and a method of controlling dual emission of the organic light-emitting diode. The organic light-emitting diode includes: a first electrode and a second electrode facing each other; a common electrode interposed between the first electrode and the second electrode; a first organic layer interposed between the first electrode and the common electrode; and a second organic layer that is interposed between the second electrode and the common electrode and is reverse-symmetric to the first organic layer with respect to the common electrode.