Chinanews client, Beijing, December 16th (Reporter Xie Yiguan) On the 16th, the China Consumers Association (hereinafter referred to as the China Consumers Association) and the Hebei and Jiangsu Consumer Rights Protection Committee released a comparative test report on 25 home projectors , The report shows that the performance of different products varies greatly, and the "4k HD" declared by the company is far from reaching the relevant requirements.
Judging from the situation of the test samples, the 25 samples involved a total of 18 brands, which were purchased from e-commerce platforms such as JD.com, Suning Tesco, Pinduoduo, etc. The purchase price ranges from 256.72 yuan to 3198.9 yuan each, and 23 LED light sources. The samples claim to have wireless projection for mobile phones, and 25 samples claim to be equipped with speakers.
The picture shows some experimental products.
Photo by China News Service reporter Xie Yiguan
The test results show that the image display performance of the samples is significantly different.
Among the 23 LED light source samples, the difference between the highest and lowest light output is more than 20 times. The light output of 3 models such as Rui Shida M3, Rigel RD-805, DAL SF100 is only more than 20 lumens, the details of the picture are blurred, and the content can not be distinguished; The definition of 10 products reached 720 TV lines, while the two TV lines of TOUMEI, REMOZE, etc. had lower definition, and the vertical value was only 350 TV lines.
There are only 4 models with excellent performance indicators of various image display.
There are 18 samples that are suitable for the sound performance test conditions. Among them, the two models of Yidun BH-808H and Rigel RD-805 have poor sound frequency response, and the remaining 16 models can meet the basic requirements.
The operating noise of the 25 samples meets the noise requirements of the indoor environment and is within 37 decibels.
The test found that domestic projectors with domestic LED light sources are more intelligent in operation.
After testing, there are 11 samples with voice recognition function, 21 samples can be wirelessly screened to mobile phones, 18 can be screened wirelessly to computers, 6 can be screened wirelessly to PAD, and 21 samples can be screened wirelessly. , Music apps, photo album pictures, documents, terminal interface and other different content wireless projection function, there are 6 projector samples with auto focus function, rich use scenes, convenient and easy to operate.
Two samples including Happy Cast and Regal RD-805 claimed to have wireless projection function, but the test found that it could not be realized.
According to the results of this test, among the 23 LED light source samples, there are 4 models with high cost performance, including XGIMI XH25L, Xiaomi MJJGTYDS02FM, JmGO J72-2D0, and Micro Shadow Z8.
The lower cost performance is Toumei C800, Xianqi XQ-30, REMOZE Rui Meng, Hengtian Pao T8, Rui Shida M3, Happy Tou, Regal RD-805, DAL SF100.
According to the China Consumers Association, it was found through this comparative test that the publicity of key indicators of LED light source products is rather chaotic.
Some products claim "High Bright 5000".
However, projector products should use "light output" to describe the brightness of the product, not brightness, so it is wrong to use "brightness 5000lm" in the product introduction or manual, and the correct statement is "light output 5000lm".
"Some products claim on the webpage that the light output reaches thousands of lm, but according to the standard method test, the light output of all LED light source samples is less than 500lm, and the light output of the projector with laser light source or ultra-high pressure mercury light source can reach thousands of lm. ." China Consumers Association pointed out.
In terms of clarity, some products claim "4K HD", but the actual test is far from reaching it.
In the eyes of the China Consumers Association, the term "4K HD" is wrong. According to the current accurate definition, "4K" refers to Ultra HD, with an inherent resolution of 4096×2160; while "HD" refers to 2K, with inherent resolution. At 1920×1080, there is a significant difference in image clarity between Ultra HD and HD.
Therefore, regardless of whether it claims to be HD or UHD, companies should state that "HD" or "UHD" refers to the inherent resolution of the projector's display system or the supported image format.
Consumers should understand this point clearly from the merchant when making a purchase to avoid misunderstandings that affect the use and viewing effect.
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