OLED Luminance Segmentation for Spatial Depth Perception
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Solution Overview
Problem
Light-emitting devices, such as OLEDs, exhibit a two-dimensional radiation profile that can create a monotonous impression due to loss of spatial depth, leading to homogeneous radiation that lacks liveliness and depth perception.
Innovation Solution
Incorporating electrically conductive tracks with time-variable and differently magnified electrical power to create adjustable luminance, utilizing pulse shape, gradient, and clocking to exploit non-linear luminance dependency, along with optical elements and varying charge transport layers to generate dynamic and local variations in brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a planar light-emitting device with uniform structure is used, then the device structure is simple and easy to manufacture, but the radiation surface appears homogeneous and monotonous, losing spatial depth perception
Solution Approach 1:
The electrode area is divided into multiple independently controllable segments or zones. By applying different electrical power levels to different segments, the radiation surface creates spatial depth perception through varying luminance levels, while maintaining the overall planar structure for ease of manufacture.
Solution Approach 2:
Different regions of the light-emitting device are given different electrical excitation characteristics. By locally varying the electrical power applied to different areas, the device achieves non-uniform luminance distribution that creates spatial depth perception, while the base structure remains simple and manufacturable.
2Illumination intensity
If time-variable electrical power is applied to create dynamic luminance variations, then spatial depth perception and liveliness are enhanced, but the device complexity and control system complexity increase
Solution Approach 1:
Time-variable electrical power is applied in periodic patterns to create dynamic luminance variations. By using periodic excitation signals with different frequencies and amplitudes for different segments, the device achieves lifelike illumination dynamics without requiring overly complex control systems.
Solution Approach 2:
The electrical power applied to different segments is made dynamically variable in time, allowing the luminance to change continuously. This dynamic control creates spatial depth perception and liveliness while the underlying device structure remains relatively simple.
3Adaptability or versatility
If multiple independently controlled conductive tracks are used to create local brightness variations, then luminance adjustability and spatial depth are improved, but the manufacturing complexity and electrode structure complexity increase
Solution Approach 1:
The electrode structure is segmented into multiple conductive tracks that can be independently controlled. This segmentation enables local brightness variations and luminance adjustability across different regions, while the segmented structure itself can be manufactured using standard fabrication techniques.
Solution Approach 2:
The multiple conductive tracks serve multiple functions: they provide electrical connection, enable local brightness control, and create spatial depth perception. By making the electrode structure multi-functional, the patent reduces the need for additional separate components, thereby managing complexity.
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 solution enables the creation of a lively and dynamic lighting effect that enhances spatial depth perception and room ambiance by allowing for adjustable liveliness and local fluctuations in brightness, combining static and dynamic variations in luminance.
Implementation Method 1
Electrons are injected from the cathode, and positive charges (holes) from the anode into the emission layer, when a voltage is applied. Light is created when these charges recombine in the emission layer.
Data Source
AI summary
A light-emitting device includes a first electrode area on a substrate and a functional light-emitting layer on the first electrode area. A second electrode area is disposed on the functional light-emitting layer. A light outlet layer is disposed in a radiation path of the functional light-emitting layer. The light outlet layer incorporates a number of optical elements whose distribution and/or geometrical shape vary across a surface of the light outlet layer.