Transparent OLED Panel Layout for Brightness and Transmittance
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Solution Overview
Problem
Existing display technologies face challenges in achieving both high light emission efficiency for self-illuminating regions and high light transmittance for transparent regions, leading to conflicting configurations that reduce the area for self-illuminating regions, increase driving voltage, and shorten lifespan.
Innovation Solution
A display panel design with separate emission and transmission parts, each equipped with organic light-emitting diodes, where the transmission part also functions as an auxiliary emission part, reducing driving voltage and increasing lifespan by utilizing a transparent substrate with reflective and transparent anodes, and multiple sub-emission layers emitting different colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If reflective electrodes are eliminated from the transparent region to increase light transmittance, then light transmittance is improved, but the area of the self-illuminating region is reduced
Solution Approach 1:
The display panel is divided into distinct emission parts and transmission parts. The emission parts contain reflective electrodes for self-illuminating display, while the transmission parts have transparent electrodes for transparent display. This spatial segmentation allows each region to be optimized for its specific function without compromise.
Solution Approach 2:
Different electrode structures are applied to different regions: reflective electrodes are used in emission parts where light emission is required, while transparent electrodes are used in transmission parts where light transmittance is required. This local differentiation of properties resolves the contradiction by allowing each region to have the quality it needs.
2Area of stationary object
If the area of self-illuminating region is reduced, then transparent region area is increased, but driving voltage must be increased to maintain brightness
Solution Approach 1:
The panel is segmented into emission and transmission parts with independent electrode structures. The emission parts use reflective electrodes optimized for light emission efficiency, allowing them to achieve required brightness at lower driving voltages despite occupying only a portion of the total area.
Solution Approach 2:
The transmission parts can serve dual purposes: they provide transparent display functionality while also contributing to overall light emission when needed. This multi-functionality allows the system to maintain brightness requirements without over-sizing the dedicated emission regions.
3Reliability
If only the self-illuminating region is consistently driven, then self-illuminating display is maintained, but lifespan is shortened
Solution Approach 1:
The emission and transmission parts can be driven in alternating or periodic fashion. Instead of continuously driving only the emission parts, the system can switch between emission mode and transparent mode, allowing the emission elements to rest periodically and extend their operational lifespan.
Solution Approach 2:
The transmission parts can continuously perform useful work by providing transparent display functionality, while the emission parts are driven only when light emission is required. This continuous utilization of transmission parts reduces the burden on emission parts and extends overall system lifespan.
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
The design enhances light emission efficiency, improves transparency, and extends the lifespan of the display device by allowing both emission and transmission parts to function simultaneously, maintaining high brightness and visibility without obstructing the field of vision.
Implementation Method 1
a transmission part includes an organic light-emitting diode for emitting light
Implementation Method 2
a reflective anode in each of the emission parts
Implementation Method 3
a transparent anode in each of the transmission parts
Data Source
AI summary
Disclosed are a panel capable of performing transparent display, a display device and a vehicle-mounted display device. A transmission part includes an organic light-emitting diode so as to perform light emission as well as display, thereby increasing an emission area, reducing the driving voltage required for emission driving, and consequently increasing the lifespan of the display device.