OLED Color Filter Placement for Reflectivity and Luminance
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Solution Overview
Problem
Current OLED display devices face challenges in achieving ultra-high definition due to limitations in light emission and reflectivity, particularly in eliminating polarization films which increase manufacturing costs and reduce luminance.
Innovation Solution
The implementation of color filters disposed between or on top of electrode layers in OLED subpixels, which reduce reflectivity and enhance luminance by mimicking the effect of polarization films, allowing for a thinner, more flexible display panel without the need for polarization films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If polarization films are used to control light emission, then reflectivity is reduced, but manufacturing cost increases and luminance decreases
Solution Approach 1:
The patent extracts and eliminates the polarization film from the display device structure, replacing it with a color filter integrated into the OLED layer structure. This removal of the polarization film directly reduces manufacturing cost while maintaining the desired optical properties through the color filter's wavelength-selective absorption and emission characteristics
Solution Approach 2:
The patent changes the optical parameters by using a color filter with specific wavelength transmission characteristics instead of a polarization film. The color filter is designed to transmit specific wavelength ranges (e.g., red, green, blue) while absorbing others, achieving low reflectivity and high luminance through wavelength-selective optical properties rather than polarization-based control
2Object-affected harmful factors
If polarization films are used to control light emission, then reflectivity is reduced, but luminance decreases
Solution Approach 1:
The patent changes the optical parameters by using a color filter with specific wavelength transmission characteristics instead of a polarization film. The color filter is designed to transmit specific wavelength ranges (e.g., red, green, blue) while absorbing others, achieving low reflectivity and high luminance through wavelength-selective optical properties rather than polarization-based control
Solution Approach 2:
The patent employs a composite structure where the color filter is integrated with the OLED emission layers and electrode structures. This composite design allows the color filter to work synergistically with the organic light-emitting materials to achieve both low reflectivity and high luminance by optimizing the combined optical properties of the layered structure
3Manufacturing precision
If color filters are disposed between electrode layers, then manufacturing complexity increases, but color accuracy and prevention of color mixing improve
Solution Approach 1:
The patent merges the color filter function with the OLED emission layer structure by integrating the color filter between the electrode layers and the organic light-emitting materials. This integration eliminates the need for separate color filter assemblies and reduces manufacturing steps, as the color filter is formed as part of the OLED fabrication process rather than as a distinct component
Solution Approach 2:
The patent positions the color filter in a specific dimensional location within the OLED structure (between electrode layers at specific vertical positions), using spatial dimensionality to achieve color separation and prevent color mixing. The color filter's placement in the vertical stacking sequence of the OLED structure enables precise optical control without adding horizontal 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
This solution decreases reflectivity to levels equivalent to using polarization films, increases luminance, and reduces manufacturing costs by eliminating the need for polarization films, while preventing color mixing between subpixels, thus achieving a high-efficiency, low-reflectance organic light-emitting display.
Implementation Method 1
at least one of the subpixels includes a color filter disposed between two electrode layers, and at least another one of the subpixels includes a color filter disposed on a protection layer on the two electrode layers
Data Source
AI summary
A light-emitting display device is provided. The light-emitting display device includes a display panel and subpixels. The subpixels are positioned in a display area of the display panel. At least one of the subpixels includes a color filter disposed between two electrode layers, and at least another one of the subpixels includes a color filter disposed on a protection layer on the two electrode layers.