OLED Pixel Heater Wiring for Low-Temperature Brightness Uniformity
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Solution Overview
Problem
Existing light-emitting devices using organic electroluminescent (EL) elements face challenges in maintaining brightness and efficiency, particularly at low temperatures, due to susceptibility of heat conduction from external air and the need for additional temperature control systems.
Innovation Solution
Incorporating heater wiring between the light-emitting units and wiring layers in light-emitting devices, using materials with higher resistance values than metal wiring to enhance heat generation and control, allowing for improved temperature management and reduced brightness unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heaters are arranged separately from the organic EL elements, then the light-emitting efficiency can be maintained, but the device complexity increases due to additional control systems and physical securement requirements
Solution Approach 1:
The patent merges the heater function with the existing wiring layer by forming heater wiring in the same layer as the signal wiring. This integration eliminates the need for separate heater components and their associated control systems, thereby reducing device complexity while maintaining the ability to control light-emitting efficiency through temperature management.
Solution Approach 2:
The wiring layer is designed to serve dual functions: as signal transmission pathways and as heating elements. By making the wiring layer multi-functional, the patent eliminates the need for dedicated heater structures and their separate control mechanisms, thus reducing overall device complexity while preserving temperature control capability.
2Reliability
If heaters are arranged on the rear surface of the display panel, then light-emitting efficiency at low temperature is improved, but heat conduction becomes susceptible to outside air
Solution Approach 1:
The patent replaces the mechanical/physical arrangement of separate heater components with an integrated electrical wiring layer that serves as the heating element. This substitution eliminates the need for physical securement and reduces susceptibility to outside air interference, as the heater wiring is embedded within the device structure rather than being a separate component.
Solution Approach 2:
The wiring layer acts as an intermediary that provides both electrical signal transmission and heating functions. By using the existing wiring infrastructure as the heating medium, the patent creates a stable thermal pathway that is less susceptible to outside air interference compared to separate heater arrangements.
3Manufacturing precision
If multiple heaters are separately arranged near organic EL elements, then brightness uniformity can be maintained, but manufacturing complexity increases due to additional securement requirements
Solution Approach 1:
The patent combines the heater function with the existing wiring layer, eliminating the need for separate heater components and their associated securement processes. This integration simplifies manufacturing while maintaining the ability to control brightness uniformity through the integrated heater wiring.
4Temperature
If heater wiring with higher resistance materials is used, then heat generation is enhanced for better temperature control, but power consumption increases
Solution Approach 1:
The patent changes the electrical resistance parameter of the wiring material to optimize heat generation. By selecting materials with higher resistance values, the system enhances heat production for better temperature control while managing power consumption through efficient wiring design and layout.
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 enhances temperature controllability, reduces power consumption, and extends the service life of light-emitting elements by effectively managing heat transfer and maintaining consistent brightness across the device.
Implementation Method 1
heater wiring is arranged between the light-emitting unit and the wiring layer... using materials with higher resistance values than metal wiring to enhance heat generation
Data Source
AI summary
A light-emitting device has a plurality of light-emitting elements, wherein the light-emitting element has a substrate having a transistor element that drives the light-emitting element, a wiring layer that is arranged over the substrate, and a light-emitting unit that is arranged over the wiring layer and includes an anode electrode, a light-emitting layer arranged on the anode electrode, and a cathode electrode arranged on the light-emitting layer, and heater wiring is arranged between the light-emitting unit and the wiring layer in at least some of the plurality of the light-emitting elements.