how to make a lcd screen for sale

If you have ever wondered what it took to make your own custom graphic LCD from scratch, this video from [Applied Science] is worth a watch. It’s concise and to the point, while still telling you what you need to know should you be interested in rolling your own. There is also a related video which goes into much more detail about experimenting with LCD technology.

[Applied Science] used microscope slides and parts purchased online to make an LCD that displays a custom graphic when activated. The only step that home experimenters might have trouble following is coating the glass slides with a clear conductive layer, which in the video is done via a process called sputtering to deposit a thin film. You don’t need to do this yourself, though. Pre-coated glass is readily available online. (Search for Indium-Tin Oxide or ‘ITO’ coated glass.)

The LCD consists of a layer of liquid crystal suspended between two layers of conductive glass. An electrical field is used to change the orientation of crystals in the suspension, which modulate the light passing through them. Polarizing filters result in a sharp contrast and therefore a visible image. To show a particular shape, some of the conductive coating is removed from one of the layers in the shape of the desired image. The process [Applied Science] uses to do this is nearly identical to etching a custom PCB.

Parts of LCD technology can be quite hackable. Neither of these videos are brand-new, either. Have any of you taken on the challenge of DIY LCD displays? We’ve seen experiments with electrochromatic glass using old LCD displays, as well as experiments in playing with polarized light to hide secret messages on LCD screens.

If you are a fan of building or prototyping your own electronics, you already know how hard it can be to find the exact type of components you need. Your builds can really benefit from more advanced components, including LCD displays. If you are an Arduino user, there are many Arduino LCD displays, repurposed LCD screens that are compatible, and shields to add the display output to your creations. The LCD display modules you find from the trusted sellers on eBay come in many different sizes, starting with screens that shows 2 rows of 16 characters, 4 rows of 20 characters, and low resolution graphical displays with dimensions of 240 by 128 or 128 by 64. If you need to replace screens for your devices, such as Android tablets, you can also find digitizer 7-inch LCD displays for your model. These LCD displays can be found from the list of sellers, many of whom offer convenient shipping options, so you can get your screens at a time that is good for you.

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As the most common display equipment in our daily life, the monitor has been closely related to our work and entertainment. For consumers now, the highest level of attention or 1000 yuan display, but now the display market products and brands are numerous, a lot of products in the name of low-price display banner, but in fact, the quality of display products is not up to standard.

When choosing a monitor, we tend to pay too much attention to the parameters of the screen, the understanding of the internal structure of the monitor can be said to know nothing. For many monitor users, it is rare to have the opportunity to disassemble the monitor. Compared with computers, notebooks, and other products, the internal structure of the monitor appears more mysterious.

In fact, the use of material and do manual work inside the monitor display performance and service life have a direct impact, so today through the means of dismantling to everyone see those so-called cheap hot display “inner core” what kind of after all?

Because now the heat of the e-sports display is very high, many do not have the performance and parameters of the display e-sports and low double banner to deceive consumers, improve sales, so the author also wants to remind the majority of consumers in the purchase to pay more attention to these points, to avoid being cheated.

First of all, the first step is to remove the frame of the display. Here we need to say that many people do not easily remove the display by themselves, because the frame of many displays is better sealed. In the process of dismantling, it is easy to damage the buckle and cause irreversible damage.

When we opened the back cover, we found that the inside of the display was very shabby. A large area of space was empty, and a small, infinitesimal PCB was placed under it. Is this what we have always wanted to see inside the display?

Below is a picture of the inside of the Samsung display that we have dismantled before. By comparison, we can clearly see the difference in the workmanship and materials used between the two. The jail-cutting phenomenon in the picture above is very obvious.

After looking at the internal structure, let’s take a look at the gap between the main control circuit board. A cheap display IC circuit board design is very simple, many components are fixed with hot melt glue, and the solder joints on the circuit board are very rough poor womanliness. Compared with the Samsung display molding, components arranged neatly for the circuit board, such workmanship is indeed very pit, simply can not guarantee the service life of the display.

The image below shows the monitor. I had worked in a computer company for many years the computer test, this belongs to the screen light-leaking before assembly will be selected, it belongs to the unqualified products, but the company also spent money, after all, so will use all the products selected defective assembling, made “machine” sales promotion, the price of the advantage of this machine is very low, often 100 yuan, the Sale price is likely to be 10 yuan, after the department of the “repair”, is not hard to find professional and technical personnel, such as poor deformation, the distance between the two parts, different color, light-leaking, screen impurities, scratches (by coating treatment is generally not easy to find, after a long time away you’ll think is their careless); Laptops, for example, are particularly concerned about appearance and can use alcohol to wipe the case.

Then I checked the Internet for information about the panel used on these cheapest monitors. Searches the major panel inquiry website, can not find the detailed information of this panel, it can be seen that this panel is not produced by the mainstream panel manufacturers, the quality is suspicious. And the information on the label is very simple and provides very little information.

After looking at the above series of data, we can also know the quality of this panel. Through the data, we can determine that this panel is produced by an unknown small OEM, and the quality cannot be guaranteed at all. From the materials used to build the interior to the panel selection, it’s easy to see what’s still profitable behind its low price LCD. Through the actual dismantling, the method revealed the cheap LCD screen jerry-building, quality control is not a good phenomenon. Through this dismantling comparison, we also see the gap between the brand manufacturer’s monitor and the unknown manufacturer’s monitor in the work and the material, and those unknown brands of the bottom screen have no actual after-sales service, once the product is bought out of the problem, the final is cheated by the consumer. So in also want to remind the majority of consumers in the purchase of display to consider, do not because of cheap LCD screen price and bring more trouble to their own.