Organic light emitting display device including overcoat layer having colored particles
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Solution Overview
Problem
OLED display devices using polarizing plates face issues with increased manufacturing costs, reduced brightness, and higher power consumption due to low light transmittance, along with poor bending and folding characteristics due to the thickness of the polarizing plate.
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 to reduce external light reflection, then visibility is enhanced, but manufacturing cost increases and brightness is reduced
Solution Approach 1:
The patent applies a color filter layer with specific color coordinates (x, y) that selectively absorbs external light in the reflection wavelength range while allowing display light to pass through. The color filter layer transforms the optical properties by changing color transmission characteristics, reducing external light reflection without significantly affecting display brightness.
Solution Approach 2:
The patent uses a composite structure combining a color filter layer with specific optical properties and an organic light-emitting diode layer. This composite material approach creates a system that simultaneously achieves reflection reduction and brightness maintenance through the synergistic optical properties of the combined layers.
2Object-affected harmful factors
If a polarizing plate is used to reduce external light reflection, then visibility is enhanced, but power consumption increases
Solution Approach 1:
The color filter layer modifies the optical spectrum by selectively transmitting and absorbing different wavelengths, reducing the need for additional polarizing components that would increase energy loss. This color-based optical filtering reduces power consumption while maintaining visibility enhancement.
3Object-affected harmful factors
If a polarizing plate is used to reduce external light reflection, then visibility is enhanced, but bending and folding characteristics deteriorate
Solution Approach 1:
The patent replaces the rigid polarizing plate with a flexible color filter layer that can be integrated into the OLED structure. This thin film approach maintains the reflection reduction function while enabling the display to bend and fold without damage, improving mechanical reliability.
4Object-affected harmful factors
If a polarizing plate is used to reduce external light reflection, then visibility is enhanced, but manufacturing cost increases
Solution Approach 1:
The color filter layer serves multiple functions simultaneously: it acts as both the color definition layer for the OLED and the external light reflection reduction layer. This multi-functionality eliminates the need for a separate polarizing plate, reducing manufacturing cost while maintaining visibility enhancement.
Solution Approach 2:
The patent merges the color filter function and the reflection reduction function into a single integrated layer structure. By combining these functions, the design eliminates additional components and manufacturing steps, thereby reducing manufacturing cost while achieving the desired optical performance.
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 and 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.