Double-Sided OLED Optical Shutter for Light Interference
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Solution Overview
Problem
Conventional double-sided organic electroluminescent displays face issues with visual recognition due to light transmission from the opposite side, especially in high ambient luminance conditions, making it difficult to see images clearly on information terminals like mobile devices.
Innovation Solution
Incorporating an optical shutter mechanism with a driver circuit and sensor system that controls light transmission or blocking based on a control signal, using liquid crystal technology such as polarizing, scattering, or absorbing types, to prevent external light from interfering with the display on the front side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If transparent electrodes are used in double-sided organic EL display, then light transmission from opposite side occurs, but this enables double-sided display functionality
Solution Approach 1:
An optical shutter layer is introduced as an intermediary component between the two display surfaces. This shutter layer selectively controls light transmission based on operational mode, blocking light when one side is active and allowing light when both sides are inactive, thereby resolving the interference problem while preserving double-sided functionality
Solution Approach 2:
The optical shutter layer dynamically changes its light transmission properties based on control signals. It transitions between transparent and opaque states depending on which side is currently active, enabling adaptive control of light interference while maintaining versatile display operation
2Illumination intensity
If brightness is increased in high ambient luminance conditions, then visual recognition should improve, but circumferential light interference worsens
Solution Approach 1:
The optical shutter acts as a mediator that isolates the display from circumferential light interference. By blocking external light paths, it creates a controlled optical environment that enhances the effectiveness of increased display brightness in improving visual recognition
3Object-affected harmful factors
If optical shutter is added to block light, then visual recognition improves, but device complexity increases
Solution Approach 1:
The optical shutter layer serves multiple functions simultaneously: it blocks light interference during single-sided operation, enables light transmission during dual-sided operation, and can be integrated into existing display structures. This multi-functionality justifies the added complexity by providing comprehensive light control capabilities
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
Enhances visual recognition by effectively blocking external light, allowing for clearer image display on double-sided organic electroluminescent displays even in high ambient luminance conditions, improving usability of information terminals.
Implementation Method 1
an optical shutter which transmits or blocks light according to an applied voltage and thereby controls an amount of light transmitted to a front side
Implementation Method 2
electroluminescence (EL) is a phenomenon that an exciton is created by an electron and a hole respectively injected from a cathode and an anode into one of a monomer inorganic layer, a monomer organic layer, a polymer inorganic layer, and a polymer organic layer, and emits light of a predetermined wavelength
Data Source
AI summary
A double-sided organic electroluminescent display is constructed with an optical shutter. The organic electroluminescent display which includes an image displaying part comprising a plurality of pixels to display an image corresponding to a data signal and a selection signal, an optical shutter provided on the image displaying part to transmit or block light in response to a control signal, and a driver circuit to supply the data and selection signals to the plurality of pixels and the control signal to the optical shutter, respectively is excellent in visual recognition.