lcd screen leaking made in china

Scientists have discovered that LCD screens leak chemicals into just about every environment where they are found, according to a new study, and these particles have the potential to be toxic over time.As described in a study published last week in Proceedings of the National Academy of Sciences, researchers collected dust samples from seven buildings in China: a cafeteria, student dorm, classroom, hotel, home, lab, and an electronics repair shop. Nearly half of the 53 samples tested positive for liquid crystal particles—which are supposed to stay sealed in the screen after manufacturing—even in places where there were no LCD devices at the time of collection.AdvertisementThe international research team analyzed 362 chemicals used in LCD screens and found that nearly 100 have the potential to be toxic. These particles don’t break down quickly and have "high mobility" in the environment. When inhaled or ingested, according to the study, these particles can build up in the body over time with toxic effects, potentially causing digestive problems and other health issues.“These chemicals are semi-liquid and can get into the environment at any time during manufacturing and recycling, and they are vaporized during burning,” said University of Saskatchewan environmental toxicologist and lead author John Giesy in a press release. “Now we also know that these chemicals are being released by products just by using them.”According to the study, these chemicals are "simply filled" into the space between polarizers (light filters) during manufacturing and are not chemically bonded to any base material. This means that "they can be released during production; through wastewater; or during active use, disposal, or recycling."To be clear, the researchers didn"t observe any adverse health effects from the accumulation of liquid crystals in the human body; they only found that these crystals do in fact leak from devices, and that they have the potential to be toxic.

Chemicals leaking from millions of computer screens in homes, offices and schools could damage human health, according to research by Chinese scientists.

Chemistry professor Su Guanyong and colleagues at Nanjing University of Science and Technology in eastern Jiangsu province studied more than 360 types of chemicals used in computer and mobile phone screens and found that 87 of them could be a danger if they got into the environment.

Some chemicals in liquid crystal displays (LCDs) could alter genes, they said. Animal cells mutated unexpectedly if exposed, and preliminary results of their ongoing study published in Proceedings of the National Academy of Sciences on Monday showed that one of the most polluted places was the home.

Researchers said about a quarter of the chemicals from screens they tested might be pollutants. Photo: Getty alt=Researchers said about a quarter of the chemicals from screens they tested might be pollutants. Photo: Getty

Studies found that excessive radiation from screens could speed up the ageing of skin and blue light from diodes could harm the retina of the eye. "But nobody has looked beyond the brightness to unveil the dark secrets behind," Su said.

Over the years, screen panel manufacturers have pushed LCD technology to higher resolutions and faster refreshing rates, but the chemical composition of the liquid crystal that fills their screens has hardly changed.

Smartphones mean booming demand for components such as screens. Photo: Ben Sin alt=Smartphones mean booming demand for components such as screens. Photo: Ben Sin

They exposed embryonic chicken cells to liquid crystal taken from the screens and compared them to cells grown in normal conditions. They found genetic changes that suggested the exposed cells had mutated.

The Nanjing team was baffled by the amount of liquid crystal in the air. They knew screens were made in dust-free factories and sealed, but their surveys of hotels, school buildings, canteens, dormitories, electronic product repair centres, homes and laboratories revealed surprising results.

Scientists say cracked screens and leaking chemicals are a worldwide problem. Photo: Shutterstock alt=Scientists say cracked screens and leaking chemicals are a worldwide problem. Photo: Shutterstock

The lowest levels were found in a canteen, a dormitory and classrooms. Su said they were not sure where the drifting liquid crystals came from. Some screens might have been cracked or broken, he said. If a screen was left on for a long time, heat and radiation might cause liquid crystal to evaporate.

"Electric device recycling plants could be a major source of emissions, with broken screens dumped everywhere and little protection. This practice must stop," he said.

JIANGSU (China) — Chemicals leaking from millions of computer screens in homes, offices and schools could damage human health, according to research by Chinese scientists.

Chemistry professor Su Guanyong and colleagues at Nanjing University of Science and Technology in eastern Jiangsu province studied more than 360 types of chemicals used in computer and mobile phone screens and found that 87 of them could be a danger if they got into the environment.

Some chemicals in liquid crystal displays (LCDs) could alter genes, they said. Animal cells mutated unexpectedly if exposed, and preliminary results of their ongoing study published in Proceedings of the National Academy of Sciences on Monday (Dec 9) showed that one of the most polluted places was the home.

Dr Su, professor at the school of environmental and biological engineering, said he had been worried about the effect of exposure to computer screens on human health for a long time.

Studies found that excessive radiation from screens could speed up the ageing of skin and blue light from diodes could harm the retina of the eye. “But nobody has looked beyond the brightness to unveil the dark secrets behind,” Dr Su said.

Over the years, screen panel manufacturers have pushed LCD technology to higher resolutions and faster refreshing rates, but the chemical composition of the liquid crystal that fills their screens has hardly changed.

Dr Su’s team went to a phone repair shop and bought used screens found in six mobile phone brands in China and abroad. “We don’t want to name them because this is not a problem of specific manufacturers. It is the whole industry,” he said.

They exposed embryonic chicken cells to liquid crystal taken from the screens and compared them to cells grown in normal conditions. They found genetic changes that suggested the exposed cells had mutated.

The Nanjing team was baffled by the amount of liquid crystal in the air. They knew screens were made in dust-free factories and sealed, but their surveys of hotels, school buildings, canteens, dormitories, electronic product repair centres, homes and laboratories revealed surprising results.

Liquid crystal was not only present in the air in all of these places, but the second-highest concentration was found in flats, while a laboratory that housed a large number screens topped the list.

The lowest levels were found in a canteen, a dormitory and classrooms. Dr Su said they were not sure where the drifting liquid crystals came from. Some screens might have been cracked or broken, he said. If a screen was left on for a long time, heat and radiation might cause liquid crystal to evaporate.

“Electric device recycling plants could be a major source of emissions, with broken screens dumped everywhere and little protection. This practice must stop,” he said. SOUTH CHINA MORNING POST

There are very obvious massive black spots on the surface of the long bar LCD screen, or there are uneven patches of light and dark and cracks at the same time. The liquid crystal display is squeezed or impacted by the external force, resulting in the liquid leakage phenomenon caused by the rupture of the liquid crystal screen. The external force is not too large, although the liquid crystal screen leakage, but there is no crack on the surface, this fault phenomenon is not easy to find, especially in the case of LCD power is not bright. After the liquid crystal display ruptures the leak, the image can still be displayed.

Strip liquid crystal screen leakage is physically damaged, and the liquid crystal screen is cut and manufactured as a whole, once the leakage will slowly expand, or even can not display normally, which is irreparable unless the entire screen is replaced. But in terms of the cost of making liquid crystal displays, the screen accounts for 2/3, so it"s not cost-effective to replace the screen, so it"s better to buy a new monitor.

The control and drive circuit in the bar display module is a low-voltage, micro-power CMOS circuit, which is easy to be breakdown by static electricity. Electrostatic breakdown is a kind of irreparable damage, which must be paid attention to and should not be careless. Therefore, the display screen in the operation, assembly and use should be careful, to strictly prevent static electricity.

A maintenance film is affixed to the surface of the installed bar display screen to prevent defilement of the appearance during assembly, so it should not be removed before the whole machine is assembled, so as not to stain or damage the appearance surface.

The above is how to maintain the whole content of the bar LCD screens, I hope that we can learn the method of maintenance, so as to prolong the life of the LCD screens. If you want to purchase bar lcd screens, please contact us by email to

LCD screen display with two polarized materials, between them is a crystal crystal solution. In the use of many users will encounter liquid crystal screen leakage problems, most users are no clue to this, do not know how to do Today, Xiao Bian gave you popular LCD screen leakage of the repair problem, the way to teach you how to maintain the LCD screen.

Seal damage: the main will appear in the screen of the four edge position, if the beverage, fruit juice, soft drinks, tea and other acid-base liquid accidentally from the outside into the screen edge of the soak, it will cause damage to the sealant, inside the LCD Leakage. Screen in the production process if the sealant problems, the same will appear such a failure.

Screen surface by external damage: generally concentrated in the middle of the screen position, can see the obvious signs of glass cracks, then hand pressure leakage parts, you can see the movement of liquid crystal trajectory along the direction of movement.

Physical phenomena: Notebook or liquid crystal display surface has a very obvious block of dark spots (in the case of power), or there are light and dark uneven patches (in the case of no power) at the same time there are cracks. Individual LCD screen due to external force is not too large, although the liquid crystal screen caused by leakage, but the surface does not produce cracks, the fault is not easy to find, especially in the case of liquid crystal display power is not bright to pay attention. After the liquid crystal display breaks the leak, the image can still be displayed. At the same time after the liquid crystal screen leakage test machine will not produce a new fault, we do not have to worry.

Causes and repair: liquid crystal display by external force extrusion or impact, resulting in liquid crystal screen rupture and leakage phenomenon. Solution and maintenance costs: This type of failure is a very clear man-made physical damage, because the display accidentally squeeze or child with a finger press, it may be caused by the impact of the transport process. LCD screen damage to the higher maintenance costs for the LCD screen if the LCD screen is generally not damaged, because the cost of replacing the LCD screen is close to the cost of a model with the same type of liquid crystal display.

Executives from one of Samsung’s key OLED display panel suppliers have been charged with stealing sensitive information from the company and leaking it to Chinese display makers, according to reports this week.

That Chinese panel makers would be willing to stoop to such lows as stealing trade secrets is perhaps not that much of a surprise when one considers OLED’s potential. OLED is already widely considered to deliver better image quality than LCD screens for example, but the real potential lies in its flexibility – the displays can bend or wrap around objects, offering both practical and aesthetic benefits. On the other hand, OLED displays are notoriously difficult to manufacture, and have caused manufacturers to struggle against low production yields for years. These manufacturing problems are widely believed to be one of the main reasons why Samsung has so far held off from shipping out any OLED TV models itself, and would also explain why the company’s rivals might be willing to cheat.

Light leakage is a pretty common issue after repairing an LCD screen assembly by yourself. However, the issue can be caused by two different situations. Depending on the problem it must be handled one way or another.

The first situation is light leaking from the four corners of the LCD screen, just like in the picture shown above. This kind of issue is caused by an assembly error. The Polaroid filmpositioned between the touch screen and LCD screen wasn"t placed correctly. However, it can"t be corrected by hand. If you want to fix this issue, you"d better make a visit to your local repair shop, because special tools and skills are a need in order to separate the polaroid from the LCD screen. We recommend the repair communitytest the functionality of LCD screens before installation to avoid such issues.

The second situation is light leaking from the bottom of the LCD screen only. This kind of issue is caused by an assembly error as well. But the issue only happens when you are reassembling your phone. Contrary to the first situation, as the issue is caused by you and not the defective parts, you can solve it by hand. The problem is light leaking from the navigation bar, so just cover the light carefully. First, you"ll need to tear down your phone again, and you can see how we tore down the HTC One. Then you will need to find the navigation light flex cable and correct the navigation lighting at the bottom of the LCD screen. What you need to do is to dip a little bit of Super X 8008adhesive and apply it to the navigation bar, HTC One light guide and the 4 corners around the LCD. Make sure that the LCD screen is pressed tight to avoid separation. There is one more thing you need to pay attention to you must be careful when you are applying the adhesive because it is very sticky.

Potentially toxic chemicals leaking from smartphone, iPhone, television and computer screens in homes, offices, and schools could harm human health, reports a new study. The findings of the study are published in the journal Proceedings of the National Academy of Sciences.

‘LCD Screen Pollution: More toxic chemicals from LCD televisions and computer screens are found in household dust. Liquid crystal monomers, the chemical building blocks of everything from flat-screen TVs to solar panels, are found to be potentially hazardous to humans, animals, and the environment. Hence, identifying a perfect solution to get rid of this LCD screen pollution could save millions of lives, both human and animal.’

The international research team, led by USask environmental toxicologist John Giesy, is sounding the alarm about liquid crystal monomers--the chemical building blocks of everything from flat screen TVs to solar panels--and the potential threat they pose to humans and the environment.

LCD panels are almost exclusively produced in three Asian countries: China, Japan, and South Korea. It"s estimated that 198 million square metres of liquid crystal display were produced last year--enough to cover the entire Caribbean island of Aruba.

For many years, huge amounts of globally produced e-waste--including LCD displays--have been dismantled, disposed of, and introduced into the environment.

Adeline Dorcas. (2019, December 11). LCD Screen Pollution: Your Household Dust may Contain More Toxic Chemicals from LCDs. Medindia. Retrieved on Feb 08, 2023 from https://www.medindia.net/news/healthwatch/lcd-screen-pollution-your-household-dust-may-contain-more-toxic-chemicals-from-lcds-191963-1.htm.

Adeline Dorcas. "LCD Screen Pollution: Your Household Dust may Contain More Toxic Chemicals from LCDs". Medindia. Feb 08, 2023. .

Adeline Dorcas. "LCD Screen Pollution: Your Household Dust may Contain More Toxic Chemicals from LCDs". Medindia. https://www.medindia.net/news/healthwatch/lcd-screen-pollution-your-household-dust-may-contain-more-toxic-chemicals-from-lcds-191963-1.htm. (accessed Feb 08, 2023).

Adeline Dorcas. 2021. LCD Screen Pollution: Your Household Dust may Contain More Toxic Chemicals from LCDs. Medindia, viewed Feb 08, 2023, https://www.medindia.net/news/healthwatch/lcd-screen-pollution-your-household-dust-may-contain-more-toxic-chemicals-from-lcds-191963-1.htm.

If you have a cracked or broken LCD screen, please use one of the following options to repair or replace it. Self-repair is not recommended.LCD display screens on notebook computers are made of two thin layers of glass with dark liquid crystal material in between. The glass is covered on the outside by a layer of plastic. Customers often feel that there cannot be a broken LCD display because they cannot feel the break. However, cracks in the glass usually cannot be felt because the plastic covering rarely breaks or fractures.

It is important to understand that lines on the LCD can also be caused by video driver issues or a problem with the media you are using. Video driver issues can normally be resolved by downloading and installing a new video driver. However, if the damage is due to a broken LCD, you should understand the following policies.

Customer Induced Damage is not covered under standard warranty. It is included only in Accidental Damage Protection. Most damaged or broken LCDs will be considered as CID.

White spots or lightened localized areas-Lighter areas or white spots are visible on the screen. This typically happens when a sharp object or edge forcefully contacts the display screen.

Dark spots in localized areas, an example of Mura defects-Dark spots are on the screen. These wide-area pixel defects are typically caused by a sharp object hitting the screen.

Black splotches cutting through the screen-The internal glass has cracked and liquid crystal is leaking (sometimes call bleeding) inside the display panel along the crack.

If you do not have an ADP policy and do not want to pay for the repair of a damaged LCD, you can connect an external monitor and use the notebook as-is. Or you could purchase a keyboard, mouse, and monitor, and use the notebook as if it were a desktop tower. LCD screen damage usually doesn"t affect the operation of the notebook computer. You can also remove the hard drive and use it in an external enclosure on another computer.

Repair guides can be hard to find. I"ve only seen guides for iMac but the general idea is the same. Remove the LCD assembly from the housing, remove the fixture tapes and side frames from the assembly, lift the panel and clean it. It seems that soft cloth is enough to clean the panels. Be aware of additional dust when wiping the panels and wipe gently, you may scarch the panel in the process if not careful enough. Make sure you seal the assembly well to prevent further dust.

It IS a very difficult repair, the assembly is very heavy, maybe more than 2/3 of the unit"s total weight, and it is a fragile piece of art. Several cables and sensors attach to the back side of the panel. You can easily damage them when lifting the LCD. There are many clips locking the frame. Quite tricky to remove. And at last the LCD driver board is connected to the panel by several ribbon cables. You must not tear any one of them or the entire unit is totaled. In conclusion, very challenging to do so.

I order a brand-new LCD-Unit or Digitizer along with the adhesive tape (already cut out in the right dimensions) off a wholesaler, clean the frame with 99% alcohol and Q-tips or microfibre cloth and install the new screen onto the frame.

Long-time display manufacturer Samsung Display will likely stop the production of LCD displays this year. A recent report says several factors have influenced the South Korean firm’s decision.

Samsung has been a reputed LCD display manufacturer since 1991. It manufactures panels for its own devices and also works as a supplier for several other Big Tech firms, such as Apple. Its displays are used in virtually all products, ranging from foldable smartphones to televisions and tablets.

Despite the company’s successful business, a recent report from The Korea Times suggests Apple is exiting the LCD production business for good. One of the biggest reasons cited for the decision is the increased competition from Chinese and Taiwanese display manufacturers in the recent past.

Samsung wanted to shut its LCD production late in 2020 and its move was on the cards for a while now. Samsung probably kept its LCD manufacturing facilities operational during the pandemic due to the sudden and unprecedented spike in demand. However, LCD technology has been eclipsed by OLED and QD-OLED technologies on most mainstream devices in the last few years. This is another reason why Samsung will probably shutter the business later this year.

Moreover, research firm Display Supply Chain Consultants (DSCC) believes the average price index of LCD panels measured as 100 in January 2014 will drop down to just 36.6 in September 2022. The figure is indicative of the demand for LCD panels and it plummeted to a record low of 41.5 in April this year. The April figure is a whopping 58 percent lower than the record-high index value of 87 in June 2021 when the pandemic was raging. This reduction in demand and price could also be detrimental to the company’s plans to soldier on producing LCDs.

The report says that in the future, Samsung will remain focused on manufacturing OLED panels and more advanced quantum dot OLED displays. LCD division staffers will likely be transferred to the QD-OLED division. Meanwhile, Samsung Display did not respond to the Korea Times’ request for comment.

Last month, we told you that a bailout of Apple LCD supplier Japan Display was running into some trouble. The company, which produces the Liquid Retina display for the iPhone XR and LCD panels for older models, depends on Apple for 60.6% of its business. Because it was late to enter the OLED market, the company has been bleeding red ink. A Chinese state-run fund and a display producer in Taiwan were ready to inject cash into the company for nearly half of its equity. But that deal has been revised partially due to Japan Display"s worsening financial condition.

Today, Japan"s Asahi reports (via 9to5Google) that Apple will invest $100 million in Japan Display. As part of this bailout, Apple will reportedly increase orders to the supplier for LCD panels, taking business away from its China-based supply chain. The display producer was supposed to receive an injection of $650 million led by China’s state-backed Silk Road Fund and Taiwan panel maker TPK Holding Co.; Japan Display issued a release on Tuesday saying that it still expects to receive this cash infusion but from different investors. TPK and China have pulled out, and have been replaced by a Chinese investment firm called Harvest Technology and Hong Kong investment firm Oasis. Apple"s cash will help Japan Display in the short term while it waits to close on the $650 million restructuring that it still believes will happen. Harvest is expected to put up the equivalent of $500 million with another $150 million coming from Oasis

Besides developing its OLED line too late, Japan Display cut production of the iPhone XR display in December. And while it has continued to lose money, Apple apparently needs to keep the company afloat. Besides producing displays for the iPhone, it does make the OLED screens used on the Apple Watch. This isn"t the first time that the tech giant cut a check to its LCD supplier. Back in 2015, Apple fronted the outfit much of the $1.5 billion it cost to build a new LCD plant, although the timing was bad. Because smartphone manufacturers continue to migrate to OLED from LCD, that factory runs at half capacity. And Apple"s deal with Japan Display called for it to be reimbursed for the $1.5 billion through a percentage of each display sold. Earlier this year, a report noted that Apple is still owed most of the money that it laid out.

There is no disputing that Japan Display needs a bailout. In 2017, the company reported a loss of $260 million that ballooned into a huge $2.3 billion deficit last year. Not coincidentally, the first iPhone to sport an OLED panel (the Apple iPhone X) was launched late in 2017. Last year, Apple released three models and two of them feature OLED displays. We expect to see no changes to the displays for the 2019 iPhone models expected to be unveiled this September. Apple sources the OLED panels used for the iPhone from Samsung and LG. Next year"s iPhones are expected to stick to OLED displays although Japan Display will still be able to supply Apple with LCD panels for older models, just as it does now.

Light leak or backlight bleeding is often noticeable around the edges or the sides of a screen. Especially while it is displaying a dark background or is in a dark environment.

NOTE: This article provides information about common issues that are seen on LCD screens. It is not something specific to a particular Dell computer but is something that can be seen on any LCD screen by any manufacturer.