OLED Display Panel Compensation Film Phase Retardation
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Solution Overview
Problem
Existing OLED display devices face challenges with high material costs and fragility due to the use of cyclic olefin polymer (COP) for touch-control electrode substrates, and flexibility issues with polyethylene terephthalate (PET) or polyimide (PI) substrates, which affect the reflection-reducing effect of circular polarizing plates, especially at inclined viewing angles.
Innovation Solution
Incorporating a compensation film to adjust the phase retardation of the touch-control electrode substrate, allowing the sum of phase retardation of the substrate and the compensation film to be less than or equal to a predetermined value, thereby maintaining effective reflection reduction at various viewing angles without impacting the flexibility of the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If COP material is used for touch-control electrode substrate, then reflection-reducing effect is improved, but cost and thickness increase and flexibility decreases
Solution Approach 1:
The patent divides the touch-control electrode substrate into multiple layers: a base substrate layer and a compensation film layer. This segmentation allows each layer to have optimized properties - the base substrate provides mechanical support while the compensation film adjusts optical properties, resolving the contradiction between reflection reduction and flexibility.
Solution Approach 2:
The patent uses composite material structure combining base substrate (made from flexible materials like PET or PI) with compensation film (having specific phase retardation properties). This composite approach achieves both flexibility from the base substrate and reflection reduction from the compensation film, eliminating the need to use fragile COP material.
2Adaptability or versatility
If flexible materials like PET or PI are used for substrate, then flexibility and thickness are improved, but reflection-reducing effect deteriorates at inclined angles
Solution Approach 1:
The patent introduces a compensation film as an intermediary layer between the flexible base substrate and the circular polarizing plate. This compensation film mediates the optical interaction by adjusting phase retardation to compensate for the inclined angle effects, allowing flexible substrates to achieve proper reflection reduction without using rigid COP material.
Solution Approach 2:
The patent changes the optical parameters (phase retardation) of the touch-control electrode assembly by adding a compensation film with specific phase retardation properties. This parameter adjustment compensates for the inclined viewing angle effects that would otherwise degrade reflection reduction performance when using flexible substrates.
3Object-affected harmful factors
If COP material is used for substrate, then reflection-reducing effect is improved, but manufacturing difficulty and fragility increase
Solution Approach 1:
The patent replaces expensive and fragile COP material with more economical flexible materials like PET or PI for the base substrate. While these materials have different optical properties, the deficiency is compensated by the compensation film, achieving cost reduction and improved manufacturability without sacrificing reflection reduction 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
This solution enhances the reflection-reducing effect of the circular polarizing plate at inclined angles while improving the flexibility and reducing the thickness of the OLED display panel, making it more suitable for flexible OLED display devices.
Implementation Method 1
a sum of phase retardation of the at least one touch-control electrode substrate and the at least one compensation film with respect to a beam of light at a same frequency is smaller than or equal to a predetermined value
Implementation Method 2
by disposing the circular polarizing plate 04 on one side of the touch-control electrode layer 02 facing away the array substrate 01, the circular polarizing plate 04 reduces the reflected light from the touch-control electrode layer 02 and the cathodes in the RGB sub-pixels 102
Data Source
AI summary
An OLED display panel and a display device are provided. The OLED display panel includes an array substrate, a circular polarizing plate disposed on one side of the array substrate, a first stack structure disposed between the array substrate and the circular polarizing plate, and at least one touch-control electrode layer disposed on one side of the first stack structure facing towards and/or facing away the circular polarizing plate. The first stack structure comprising at least one touch-control electrode substrate and at least one compensation film. A sum of phase retardation of the at least one touch-control electrode substrate and the at least one compensation film with respect to a beam of light at a same frequency is smaller than or equal to a predetermined value.