OLED Color Filter Plate Dye Layers for Ambient Light Reflection
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Solution Overview
Problem
Organic light-emitting display (OLED) devices experience visibility degradation due to ambient light reflection and reduced transmissivity caused by metallic electrodes, and the use of circular polarization plates leads to decreased transmissivity and flexibility issues in flexible OLED devices.
Innovation Solution
A color filter plate with a substrate, color filter patterns, and dye layers that absorb specific wavelength ranges of light, reducing ambient light reflection and improving transmissivity without the need for circular polarization plates, allowing for flexible OLED device design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a metallic second electrode is used to facilitate electron injection and increase emitting efficiency, then the emitting efficiency is improved, but the ambient light is reflected by the second electrode such that the visibility of the OLED device is degraded
Solution Approach 1:
The patent converts the harmful reflection of ambient light by the metallic second electrode into a beneficial effect by introducing a circular polarization plate. The circular polarization plate causes ambient light to be reflected back toward its source, while allowing internally generated light to pass through, thus converting the harmful reflection into a selective optical filter that improves visibility.
Solution Approach 2:
The circular polarization plate acts as an intermediary between the metallic second electrode and the external environment. It mediates the interaction between ambient light and internally generated light, allowing the metallic electrode to maintain its high emitting efficiency while the polarization plate controls the optical output to improve visibility.
2Object-affected harmful factors
If a circular polarization plate is used to prevent ambient light reflection, then the visibility is improved, but the light from the organic emitting layer is absorbed by the circular polarization plate such that the transmissivity is remarkably decreased
Solution Approach 1:
The patent changes the optical parameters of the system by introducing a 1/4 retardation plate in combination with the circular polarization plate. This modifies the polarization state of light passing through the system, allowing internally generated light to maintain higher transmissivity while still achieving the visibility improvement by differentially affecting ambient and internal light.
3Reliability
If TAC films are attached to protect the circular polarization plate from moisture, then the reliability is improved, but the circular polarization plate becomes difficult to use for flexible OLED devices
Solution Approach 1:
The patent replaces the rigid TAC films with a flexible waterproof coating layer that can be applied directly to the circular polarization plate. This flexible coating maintains the moisture protection function while allowing the entire assembly to be bent and flexed, enabling use in flexible OLED devices.
Solution Approach 2:
The patent creates a composite structure by combining the circular polarization plate with a flexible waterproof coating material. This composite maintains the protective function against moisture while introducing flexibility, allowing the polarization plate to be integrated into flexible OLED devices without compromising reliability.
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 enhances visibility and transmissivity of OLED devices by efficiently blocking ambient light and maintaining flexibility, eliminating the need for hard circular polarization plates.
Implementation Method 1
the first dye absorbs light having a second wavelength range other than the first wavelength range, and the second dye absorbs light having a third wavelength range other than the first wavelength range and the second wavelength range
Data Source
AI summary
A color filter plate for a display device according to an embodiment includes a substrate including a first pixel region; a first color filter pattern over the substrate and transmitting light having a first wavelength range; and a first dye layer corresponding to the first color filter pattern and over the substrate, the first dye layer including first and second dyes, wherein the first dye absorbs light having a second wavelength range other than the first wavelength range, and the second dye absorbs light having a third wavelength range other than the first wavelength range and the second wavelength range.