Double-sided OLED Display with Shared TFT Driving Circuit
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Solution Overview
Problem
Current display technologies, such as OLEDs, face challenges in achieving efficient double-sided display capabilities with high resolution and low power consumption while maintaining image quality and simplicity in design.
Innovation Solution
A double-sided display device is designed with a supporting substrate featuring thin-film transistors (TFTs) and organic light-emitting diodes (OLEDs) on both surfaces, where the OLEDs are electrically connected to the TFTs to control current flow and emit light of the same or different colors, with overlapping structures to simplify the driving circuitry and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate driving circuits are used for each OLED on both surfaces, then each OLED can be independently controlled, but the device complexity and power consumption increase
Solution Approach 1:
The patent merges the driving functions by using a single TFT to control both the first OLED on the first surface and the second OLED on the second surface. The TFT's source electrode connects to both OLEDs through respective connection electrodes, allowing one transistor to drive two light-emitting elements simultaneously, thereby reducing overall circuit complexity while maintaining independent controllability.
Solution Approach 2:
The TFT is designed with multi-functionality to serve both OLEDs. The source electrode of the TFT connects to both the first and second OLEDs, enabling the single transistor to perform the driving function for both light-emitting elements on opposite surfaces, thus reducing the total number of required driving components.
2Reliability
If multiple TFTs are used to drive OLEDs on both surfaces, then each OLED can be driven independently, but the number of components and device complexity increase
Solution Approach 1:
The patent combines multiple driving functions into a single TFT. The TFT's source electrode is connected to both the first OLED and the second OLED through separate connection electrodes, allowing one transistor to independently control both light-emitting elements, thereby reducing the total component count while maintaining independent driving capability.
3Adaptability or versatility
If OLEDs are positioned on both surfaces of the substrate, then double-sided display capability is achieved, but the manufacturing precision and alignment requirements increase
Solution Approach 1:
The patent utilizes the third dimension (depth/thickness) by positioning OLEDs on opposite surfaces of the substrate. This spatial arrangement allows both displays to operate independently without requiring precise lateral alignment between the two OLEDs, as they are separated in the vertical dimension. The TFT and connection electrodes are configured to accommodate this three-dimensional layout, simplifying the manufacturing alignment requirements compared to planar arrangements.
4Use of energy by moving object
If the first OLED and second OLED are controlled by the same TFT, then power consumption is reduced, but the ability to display different images simultaneously on both surfaces is limited
Solution Approach 1:
The patent implements dynamic control by configuring the TFT with separate connection paths to both OLEDs. The source electrode connects to both OLEDs through separate connection electrodes, allowing the TFT to dynamically switch or independently control the driving signals to each OLED based on display requirements, thus enabling different images to be displayed on both surfaces while maintaining low power consumption.
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 configuration enables simultaneous image display on both sides without significant resolution loss, reduces power consumption, and enhances display quality by ensuring equal luminance and contrast across both surfaces.
Implementation Method 1
Electrons and holes injected from the electrodes recombine in the organic light-emitting layer to form excitons. Light is emitted when the excitons fall from an excited state to a ground state.
Data Source
AI summary
A display device includes a substrate, a first thin-film transistor (TFT), a first organic light-emitting diode (OLED), and a second OLED. The TFT is on a first surface of the substrate and includes a first output electrode and a second output electrode. The OLED is on the first surface of the substrate and is electrically connected to the first output electrode of the TFT. The second OLED is on a second surface of the substrate and is electrically connected to the second output electrode of the TFT.