OLED Display Phase Control Layer for External Light Reflection
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Solution Overview
Problem
Conventional organic light emitting display apparatuses face challenges in achieving both flexibility and visibility due to the thickness of circular polarization films, which hinder their application as flexible display devices.
Innovation Solution
The organic light emitting display apparatus is designed with a substrate divided into emission and non-emission areas, featuring a pixel electrode, intermediate layer, counter electrode, external light reflection layer, phase control layer, thin-film encapsulating layer, and a black matrix, which collectively reduce external light reflection and enhance flexibility without the need for a polarizer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a circular polarization film is used to improve visibility, then visibility is improved, but the thickness of the display apparatus increases and flexibility is reduced
Solution Approach 1:
The invention extracts and removes the circular polarization film from the display structure, replacing it with a reflection prevention structure consisting of a reflection prevention layer and a phase control layer. This extraction eliminates the thickness contribution of the polarization film while maintaining visibility through alternative optical control mechanisms.
Solution Approach 2:
The reflection prevention layer and phase control layer serve multiple functions: they prevent external light reflection, control the phase of reflected light to achieve destructive interference, and maintain a thin profile. This multi-functional approach replaces the single-function polarization film, achieving both visibility improvement and thickness reduction.
2Illumination intensity
If a circular polarization film is used to improve visibility, then visibility is improved, but flexibility is reduced
Solution Approach 1:
By removing the rigid circular polarization film from the display structure, the invention enables the display to achieve flexibility. The replacement reflection prevention structure with phase control layer is designed to be thin and adaptable, allowing the display to be bent or folded without the constraints imposed by thick polarization films.
Solution Approach 2:
The invention employs thin-film structures (reflection prevention layer and phase control layer) that inherently provide flexibility. These thin films can conform to bent or folded substrates, enabling flexible display applications while maintaining their optical functions of preventing external light reflection and controlling light phase.
3Object-affected harmful factors
If a thick polarization film is used to prevent external light reflection, then reflection is reduced, but the display becomes less flexible and more rigid
Solution Approach 1:
The invention changes the optical parameters by introducing a phase control layer that manipulates the phase of reflected light. Instead of relying on the thickness of a polarization film to prevent reflection, the system uses phase control to achieve destructive interference of reflected light, thereby reducing external light reflection while maintaining flexibility through thin-film construction.
Solution Approach 2:
The invention uses a composite structure consisting of a reflection prevention layer and a phase control layer. This composite approach combines materials with different optical properties to achieve both reflection prevention and flexibility, replacing the single-material polarization film with a multi-layer composite that offers superior adaptability.
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 configuration effectively prevents external light reflection, improves visibility, and increases the flexibility of the display apparatus, allowing for thinner and more efficient organic light emitting displays compared to conventional designs.
Implementation Method 1
a phase control layer disposed between the counter electrode and the external light reflection layer, the phase control layer being configured to control a phase of a light reflected by the counter electrode to destructive interfere with light reflected by the external light reflection layer
Implementation Method 2
an external light reflection layer disposed on the counter electrode in the emission area and the non-emission area, the external light reflection layer being configured to reflect a portion of incident visible rays
Implementation Method 3
absorb and transmit another portion of the incident visible rays
Data Source
AI summary
An organic light emitting display apparatus includes: a substrate divided into an emission area and a non-emission area; a pixel electrode disposed in the emission area; an intermediate layer disposed on the pixel electrode, including an organic emission layer; a counter electrode covering the intermediate layer; an external light reflection layer disposed on the counter electrode, the external light reflection layer being configured to reflect a portion of incident visible rays; and absorb and transmit another portion of the incident visible rays; a phase control layer disposed between the counter electrode and the external light reflection layer, being configured to control a phase of a light reflected by the counter electrode to destructive interfere with light reflected by the external light reflection layer; a thin-film encapsulating layer disposed on the external light reflection layer; and a black matrix disposed on the thin-film encapsulating layer in the non-emission area.