Organic Light-Emitting Diode (OLED) technology is utilized to produce the world’s widely regarded best display panels by both consumers and professionals. These emissive displays are not just thin and efficient; they also offer the best image quality available ever.  In this post, we will share the difference between OLED and LCD Intermediates.

The Difference Between OLED and LCD Intermediates

OLED displays can be made flexible, foldable, transparent, rollable, and stretchy. OLEDs are the display technology of the future! 

Over a billion OLED panels are estimated to be produced yearly by 2022.

A sequence of organic thin films is placed between two conductors to create OLED displays. A bright light is emitted when an electrical current is applied. Below is the comparison of the OLED and LCD Intermediates.

Polyaniline as Hole Injection Layer (HIL) in OLEDs

Polyaniline (PAni) can be efficiently employed as HIL, and that it has a better mix of features than the commonly used PEDT. Commercially available water-borne PAni dispersions have a particle size of around 35 nm, a lateral conductivity of close to 10-6 S/cm (when deposited and dried), and luminescence performance statistics in final devices that are at least similar to PEDT, frequently up to 30% more efficient.

PAni was not considered a reliable HIL in commercial devices in early times. Later, a systematic approach was introduced to develop a water-based, nanoscaled, stable PAni system deployed as HIL via spin coating or ink-jetting.

The creation of nanoscaled water-dispersible polyaniline powder results in a long-lasting, agglomerate-free HI system that can be applied on ITO to ease. The dried PAni layers have a lower conductivity than PEDT. Hence avoid cross talk in passive matrix displays. The reduction of the injection barrier between the ITO anode and the polymeric emitter is undoubtedly the most impressive enhancement over the PEDT. When PAni is used as the HIL, the device performance for yellow, blue, and green light-emitting polymers can be greatly improved. The use of PAni instead of PEDT does not reduce lifetime, according to preliminary experiments. 

CAS NO .25233-30-1

OLED and LCD Intermediates
OLED and LCD Intermediates

Liquid Crystal Display (LCD) is a flat panel display that operates primarily with liquid crystals. It converts an electrical stimulus into a visual signal by using the electro-optical properties of a liquid crystal. Polarization is the phenomenon that is used in the functioning of these displays. LCDs offer a unique mix of low cost, low power consumption, and acceptable viewing characteristics.

Polyimides for Liquid Crystal Alignment Films

The usage of LC alignment films, which provide a homogeneous and defect-free LC alignment, is required to manufacture AM-TN LCDs. The LC alignment film was tested on a variety of organic and inorganic materials. In terms of heat resistance, chemical stability, and mechanical strength, polyimide (PI) is one of the most suitable materials for LC alignment film.

For making full-color LCDs with color filters, conventional PI materials that require curing temperatures above 250°C are not suited. Because dyes and organic pigments in color filters are unstable over 200°C. PI alignment sheets that can be cured below 200°C are required for color LCDs with color filters. Synthesized organic-solvent-soluble PIs are soluble in organic solvents like N-methyl pyrrolidone.

The unique nature of these PIs allows the low temperature to cure below 200°C by just solvent evaporation. Moreover, findings on the properties of soluble PIs’ unidirectional alignment, pretilt angles, and VHR suggest that soluble PIs are good for LC alignment films in active matrix displays. 

TFMB CAS NO. 341-58-2

6FDA CAS NO. 1107-00-2

AB-TFMB CAS NO. 1449757-11-2

Features of 2-methyl-1,4-phenylene bis(4-(3-(acryloyloxy)propoxy)benzoate)

The column phase is dominated by RM257 liquid crystal monomers, which contain the following characteristics:

  • the molecule has a 4:1 length ratio and is a stick structure.
  • The molecular ends consist of polar or polarizable groups to keep the molecules in a well-ordered orientation.
  • The molecule’s long axis is easy to bend and has some stiffness.

RM257 CAS NO. 174063-87-7

The related chemicals-

1) (4-hydroxyphenyl)boronic acid CAS NO.71597-85-8

2) 1-bromo-4-(but-3-en-1-yl)benzene CAS NO.15451-32-8

3) (3-fluoro-4′-pentyl-[1,1′-biphenyl]-4-yl)boronic acid CAS NO.163129-14-4

4) 1-ethoxy-2,3-difluorobenzene CAS NO.121219-07-6

5) 1-butoxy-2,3-difluorobenzene CAS NO.136239-66-2

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