Hybrid OLED-ILED Display for Blue Subpixel Stability
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Solution Overview
Problem
OLED displays are vulnerable to degradation due to their organic constituents, leading to issues such as yellowing of the screen caused by red-shift phenomena, particularly affecting blue subpixels.
Innovation Solution
A display device using a hybrid light-emitting array structure that combines organic light-emitting diodes (OLEDs) with inorganic light-emitting diodes (ILEDs), where the ILEDs are used to replace or supplement the blue subpixels to mitigate degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If OLED displays use organic light-emitting diodes for all subpixels, then the display can achieve flexibility and thinness, but the blue subpixels degrade over time causing yellowing and red-shift phenomena
Solution Approach 1:
The patent combines organic light-emitting diodes (OLEDs) and inorganic light-emitting diodes (ILEDs) in a hybrid display structure. Specifically, ILEDs are used for blue subpixels while OLEDs are used for red and green subpixels, merging the advantages of both technologies to achieve flexibility from OLEDs and stability from ILEDs.
Solution Approach 2:
The patent applies different light-emitting materials to different subpixels based on their specific requirements. ILEDs with inorganic light-emitting layers are used specifically for blue subpixels where stability is critical, while OLEDs are used for red and green subpixels where flexibility is prioritized. This local differentiation resolves the contradiction by matching material properties to functional requirements.
2Illumination intensity
If OLED displays use shorter wavelength light for blue subpixels, then the display achieves better color performance, but the luminance degrades more quickly over time
Solution Approach 1:
The patent changes the material parameter of the light-emitting layer for blue subpixels from organic to inorganic. ILEDs use inorganic light-emitting layers that can maintain stable luminance over time even at shorter wavelengths, whereas OLEDs use organic materials that degrade faster. This parameter change in material composition resolves the contradiction between blue light emission quality and long-term stability.
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 hybrid structure significantly improves the reliability and longevity of the display device while maintaining the advantages of OLEDs, effectively addressing the degradation issues and enhancing productivity and quality.
Implementation Method 1
LED (light emitting diode), which is a well-known semiconductor light-emitting element that converts electric current into light
Implementation Method 2
a first subpixel configured to emit light of a first color and including an organic light-emitting diode
Data Source
AI summary
The present disclosure relates to a display apparatus using, for example, a micro light emitting diode (LED), and a manufacturing method therefor, wherein the apparatus and method can be applied to a technical field related to display apparatuses. According to the present disclosure, a display apparatus using a light-emitting device comprises: a first electrode which is divided into a plurality of segments; a common second electrode located on the first electrode; and a plurality of sub pixels electrically connected between the first electrode segments and the second electrode and forming individual pixels, wherein the sub pixels may include a first sub pixel which emits light of a first color and includes an organic light-emitting device, a second sub pixel which emits light of a second color and includes an organic light-emitting device, a third sub pixel which emits light of a third color and includes an inorganic light-emitting device, and a fourth sub pixel which includes an organic light-emitting device for emitting light which is a mixture of the light of the first to third colors.