Kooptech's blog - 3D technologies
Bright, deep and vivid – colours achieved by TV screens and monitors have been one of the main concerns of screen manufacturers in the recent years. Either it’s an LCD screen or a laser projector, achieving a wide gamut of colours is a challenge that comes up for almost all display technologies and techniques present on today’s market. Is it even possible to achieve primary RGB colours that are pure and less diluted by other colours in the mix? NEC LP Projector seems to be the one positive answer to that question.
One of the most logical answers to the problem of achieving pure forms of red, green and blue would be to simply use red, blue and green lasers. However, the matter is not that simple and the method itself has already proven to be not as effective as one would think. In response, LCD manufacturers started using only blue LEDs and creating the other two colours by using quantum dots. It is much more expensive, but far better quality. Yet, it’s still not perfect.
How about illuminating LCD by white LEDs by using yellow YAG phosphors? Companies tried and failed here too – yellow often results in impure colours and not as wide gamut of RGB as they would hope to achieve. How about filtering the light and taking out all frequencies between red and green? Done and working in many TV sets now, but still not as effective as we could hope. Why is it so hard to achieve a wide gamut of colours? Is our technology not advanced enough?
Lasers are able to produce much wider colour gamuts and that has been known for a long time. It is the most basic explanation for why we don’t use lamp projectors anymore! However, sometimes it’s very difficult to develop lasers with good efficiency. Most manufacturers decided to use phosphor in order to convert blue light to yellow and then work off of that. NEC LP projectors took a different approach when they decided to use RB lasers instead, relying on phosphor only to convert blue to green. As the colours are closer to each other than yellow is to any of them, they can achieve a relatively pure green which is the most tricky one of them all. For now, the system seems to be working just fine and the search for better colour gamuts will resume once technology has advanced once more.