The living room has long been the heart of entertainment for many households. With the rapid advancement of audio-visual technology and a shift in consumer preferences, people are now seeking an immersive, cinema-like experience at home. For nearly 60 years, television has dominated this space. Despite efforts by TV manufacturers to create ultra-thin and large-screen models, they face limitations due to LCD panel technology and high costs. While prices have risen from hundreds to tens of thousands of yuan, these remain unaffordable for the general public, especially when it comes to large-screen entertainment.
Enter the smart projector—a game-changer that brought the visual impact of a 100-inch screen into the home. Compared to traditional TVs, smart projectors offer natural advantages such as larger screens, rich content, versatile usage scenarios, and more affordable pricing. These factors have made smart projectors a rising star in the market.
Since 2014, the smart projection industry has seen explosive growth. Companies like a certain meter secured millions in funding, followed by nut-projection, which attracted investments from celebrities like Li Bingbing and Huang Xiaoming. By 2015 and 2016, both companies reached their C-round financing with several hundred million yuan raised.
Sales of smart projectors have grown rapidly—from 500,000 units in 2015 to 1.5 million in 2016—with an average annual growth rate exceeding 45%. New brands emerged, and even internet giants like Alibaba entered the market with products such as the “Tmall Magic Screen.â€
For a time, smart projectors were the talk of the town. As an enthusiast of digital control and intelligent projection, Xiao Bian started with a 1080P smart projector. The product he tested over the weekend was impressive: a 100-inch screen paired with Harman Kardon sound turned his living room into a mini theater. Excited, he chose a classic film, "Braveheart," to enjoy on a quiet weekend.
However, after about 30 minutes, the image became blurry. He had to refocus repeatedly. Over the next few days, the issue worsened—especially when viewing PPTs. Text appeared distorted, with ghosting effects that felt like looking through a foggy window. After checking the manual and contacting customer service, he found out that this was considered a “normal†phenomenon, with no solution available. Frustrated, he decided to return the product.
But what was behind this so-called “normal†behavior? Investigating further, Xiao Bian discovered that others had similar issues. Many users reported the same problem, yet returns were often denied based on the excuse that it was “normal.†As a tech enthusiast, he wanted to uncover the truth behind this flaw.
After consulting industry experts and reviewing technical documents, he learned that this issue is known as “thermal defocusing.†It occurs when heat from the light engine causes the lens to slightly shift focus, resulting in a blurred image. This is a common problem in projectors, but it's more pronounced in compact smart projectors due to their smaller size and proximity between the lens and light source.
Xiao Bian then conducted tests on various smart projectors. He connected them to power, activated the highlight mode, and played the same document for two hours. He recorded the sharpness of the image every 30 minutes. The results were alarming: most devices showed significant blurring within 15–20 minutes, requiring frequent refocusing.
One model, a certain 1S, began to blur after 20 minutes. Another, a C model, had severe blurring after just 16 minutes. A fruit J6 also suffered from similar issues. Even a cool view S3 experienced severe blurring after 20 minutes, making it hard to watch without constant adjustments.
Interestingly, when testing a painting’s TT and Dawei series, the results were different. The screen briefly flickered with a “focus adjustment†message, and the image automatically corrected itself. This feature, called “dynamic focus adjustment,†is a technological breakthrough that addresses the thermal defocusing issue.
This innovation sets a new standard in the industry. If other major brands adopt similar technologies, it could revolutionize the smart projector market. Just as smartphones evolved from imitations of Apple to independent innovations, the projection industry may follow a similar path.
In conclusion, while smart projectors offer incredible value and convenience, the issue of thermal defocusing remains a critical pain point. Solutions like dynamic focus adjustment can change the game, ensuring a better user experience. As consumers become more informed, they will demand higher quality and reliability from their home entertainment devices.
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