micro led进展

By this I mean zoom into the picture to see if the pixels have been captured and then do a count over a short distance. I opened the pictures in Windows Paint but presume other systems will have something just a good.

Samsung MICRO LED

I decided to take a picture of the full screen -so the supplier could see it was theirs. If your camera has less resolution you may need to cover a smaller section.

First set up the screen with an input that has at least sections that are predominately red, green or blue – the pixel colours. On the Pi I just used the video as this has some areas of blue. I have in the past used a program to show a bmp file full screen - see https://www.raspberrypi-spy.co.uk/2017/02/how-to-display-images-on-raspbian-command-line-with-fbi/. If using a camera input, just point the camera at a plain card that is mostly one of the pixel colours.

Note: Samsung paid for the author's travel expenses to CES 2025. There are no agreements regarding the nature and scope of our reporting. (uk)

micro led技术

At the stand, TCL will be demonstrating the considerable development that dimmable backlighting has undergone recently. From what used to be a rather coarse division to a differentiation in the backlight that allows object contours to be easily recognized. The demo still lacks the implementation with micro-LEDs, which should be even finer.

Now to the camera. Most will be OK for this job. Manual focus probably helps. A quick note on resolution. My 10megapixel camera gives pictures with a resolution of 3648 x 2736. So a picture of the full monitor screen gives more than 4 picture pixels for every screen pixel at 800 pixels horizontal and more than 7 picture pixels for every screen pixel at 480 pixels horizontal resolution. This is enough to pick out individual pixels and hence count the number of pixels over a set distance. I used 5mm.

So I then sent them a second picture – that just had a zoomed in section of the first. In this the individual pixels were visible. I then added the pixel count and calculation to show the number of pixels expected over 5mm for a screen width of 108mm and resolutions of 800 or 480. This was much clearer and they agreed. Second picture:

micro led和mini led的区别

However, the picture quality of the supposed micro LED TV is impressive. Because instead of a “white” or blue backlight (for quantum dots), red, green, and blue LEDs shine through the liquid crystal layer from behind, the display produces very rich colors with enormous luminosity. Although there are still RGB color filters on the LC layer, these can filter out the red, green, and blue light components for the RGB sub-pixels in a more targeted and therefore less lossy way. The color saturation and impressive brightness of the new televisions are well worth seeing.

This article was originally published in German. It was translated with technical assistance and editorially reviewed before publication.

When I first loaded up my picture to AliExpress they did not understand that they had to zoom in – and so dismissed my dispute. It is easy to forget to explain what seems obvious – but may not be to all! Also their system may not have allowed zooming into pictures. This is what I uploaded:

Microledinfo

The need to measure pixel resolution arose from buying some 5” car monitor LCD screens that were specified as 800x480 pixel resolution and realising I had been supplied with 480x272 pixel versions. The picture on the lower resolution screens is not quite as sharp. These screens take a PAL/NTSC composite input and hence the resolution is not so easy to check. I expect most customers do not notice and hence sellers can get away with supplying lower specification products. This seems to be a widespread problem that is getting worse. I have had problems with suppliers on both ebay and AliExpress. Hence I thought it useful to show that it is not particularly difficult to measure the pixel spacing – just using a camera and a ruler – something the last seller said was not possible. So here is the simple art of the impossible!

At CES, Samsung has now circulated another designation that is likely to confuse users unnecessarily: The company is calling LCD televisions with dimmable micro LEDs in the backlight “RGB micro LED TV”. Until now, “micro LED TV” has been reserved for “real” LED televisions, which have neither a backlight nor an LCD or OLED layer. Instead, each pixel consists of tiny inorganic light-emitting diodes, i.e., micro LEDs. The term “micro” is usually used when the diodes are smaller than 100 nm in diameter.

micro led显示器

In addition, the RGB diodes of the Direct LED backlight are dimmed separately locally for each color channel, which in turn reduces the black level and increases the in-image contrast. How well this works also depends on the number of dimming zones. Samsung did not want to comment on this, as the device on display, a 98-inch screen with 8K resolution, was a prototype.

Micro LED

I hope this helps anyone caught in the same trap get a refund if the supplier is not able to provide the product they paid for. Suppliers can also use this technique to argue with their sources. Hopefully the outcome will be less deception and more happy customers.

I hope this is helpful to both buyers and sellers of LCD screens. My last supplier did not seem to have any means of checking their products – so it could be their source that was the problem. Trying to get this right can save a load of hassle. I ordered 11 off (from a supplier who had supplied correct items a year earlier!) and they were all wrong. AliExpress agreed eventually they were not as described – but only offered 30% refund plus no refund of the duty I had paid. So much for their buyer protection and refund if not as described – so beware! It is best to get one off first to check if you want to order a greater number. In all cases I had contacted the seller to emphasise my requirement for 800x480 pixel resolution. For what it’s worth my application was to show a continuous video from a Raspberry Pi zero – using the composite video signal. The space available did not have space for the connectors on HDMI screens. I had agreed the higher spec. screens with the guy I was making the systems for and I want my work to look as good as it can.

When Samsung rebranded its LCD televisions with LEDs in the backlight as LED TVs a few years ago, the Korean manufacturer misled many users. The supposed difference to LCD TVs did not exist; both variants used liquid crystals as the imaging layer, which was and is illuminated by an (LED) backlight.

micro led电视

There have already been misleading designations in the TV sector with so-called LED TVs. Now there are new pitfalls for inexperienced customers.

My trick with focussing was to use the manual option. I found that when the focus was right that Moire fringes would appear. Macro autofocus should work but will focus on the ruler rather than the screen. Be prepared to experiment a bit if you don’t get the sharpness required.

It has yet to be decided what size, resolution, and number of zones the final product will have. This is due to go on sale at the end of the year, Samsung explained. The electronics specialist has also not yet commented on the price. However, the price will be higher than for conventional LCD TVs because although eight million LEDs are not required here, the transfer of the tiny micro-LEDs from the wafer to the backlight substrate will be expensive.

Chinese manufacturers Hisense and TCL will also be showing LCD TVs in Las Vegas with RGB backlights that can be dimmed locally per color channel, just like Samsung's RGB micro-LED TVs. At Hisense, the devices are called Trichroma LED TVs, at TCL mini LED TVs – although both use LCD technology.