OLED Color Filter and Overcoat Structure for Low-Reflectance Panels
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Solution Overview
Problem
Organic light emitting display devices face issues with increased manufacturing costs and reduced brightness due to the use of polarizing plates, which also lead to higher power consumption and poor bending/folding characteristics.
Innovation Solution
An organic light emitting display panel and device that omits the polarizing plate by incorporating a color filter layer on the encapsulation layer and an overcoat layer with colored particles, adjusting the thickness of the color filters and overcoat layer for each subpixel to reduce external light reflectance and enhance light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizing plate is used in OLED display devices, then external light reflection is reduced and visibility is enhanced, but manufacturing cost increases and brightness is reduced
Solution Approach 1:
The invention divides the light management function into multiple layers: a color filter layer with color filters for each subpixel, and an overcoat layer with colored particles. This segmentation allows each layer to perform its specific function (color filtering and reflection reduction) without requiring a polarizing plate, thereby maintaining brightness while reducing external light reflection.
Solution Approach 2:
The overcoat layer is designed with colored particles that have specific optical properties tailored for reducing external light reflection in the viewing direction. The color filters in the color filter layer are specifically positioned and configured to filter light for each subpixel. This local optimization of optical properties allows the structure to reduce reflection without significantly impacting brightness.
2Object-affected harmful factors
If a polarizing plate is used in OLED display devices, then visibility is enhanced, but power consumption increases
Solution Approach 1:
By segmenting the light management function across the color filter layer and overcoat layer, the invention eliminates the need for a polarizing plate. This allows the OLED to operate without the additional power consumption associated with polarizing plate integration, while still achieving the desired reduction in external light reflection through the optimized optical structure.
3Object-affected harmful factors
If a polarizing plate is used in OLED display devices, then true black is implemented, but manufacturing cost increases
Solution Approach 1:
The invention merges the functions of the color filter and the reflection reduction layer into a integrated structure where the color filter layer and overcoat layer work together. This combining of functions eliminates the need for a separate polarizing plate, thereby reducing manufacturing complexity and cost while maintaining the ability to implement true black and reduce external light reflection.
4Object-affected harmful factors
If the overcoat layer thickness is increased to reduce external light reflection, then reflectance is reduced, but light emission efficiency decreases
Solution Approach 1:
The overcoat layer is designed with colored particles that provide reflection reduction properties specifically optimized for the viewing direction. The thickness and particle distribution are locally optimized to achieve sufficient reflection reduction without excessive thickness that would block emitted light. This local optimization allows the structure to reduce external light reflection while maintaining light emission efficiency.
Solution Approach 2:
The overcoat layer uses a composite structure with colored particles dispersed in a matrix material. This composite design allows the layer to achieve both reflection reduction and light transmission properties that a solid homogeneous layer of the same thickness could not provide, thereby reducing external light reflection without significantly impacting light emission efficiency.
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 reduces external light reflectance, lowers power consumption, and improves bending/folding reliability by maintaining equivalent performance while enhancing brightness and reducing manufacturing costs.
Implementation Method 1
an overcoat layer in an opaque color, disposed on the color filter layer and including colored particles
Implementation Method 2
an organic light emitting element disposed on the substrate
Data Source
AI summary
An organic light emitting display panel and an organic light emitting display device include an encapsulation layer positioned on a substrate where an organic light emitting element is disposed, a plurality of color filters positioned on the encapsulation layer, an overcoat layer in an opaque color, positioned on the plurality of color filters and including a plurality of colored particles, and an adhesive layer positioned on the overcoat layer and having reduced external light reflectance and power consumption by adjusting the thickness of the overcoat layer or the thickness of the color filter layer for each subpixel and allowing the overcoat layer to differ in color from the plurality of color filter layers.