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The evaluation is from the cool open company's K-series products, K-series products with main performance and cost performance, 55-inch large-screen and high-end mainstream configurations allow the author to have a small expectation of this product, so it is not necessary to delay. Immediately enter today's evaluation of it!
Cool open K55 equipped with ARM A7 4 core CPU and Mali 450 MP4 4+2 core graphics processor. 1GB DDR3, 4GB eMMC large memory. Has a super high frequency + large memory allows the TV to ensure the smooth operation of large-scale games, do not get stuck. In terms of price, the quotation for Kukai K55 2999 is also quite attractive.
Cool open K55 appearance articles
Cool open K55 overall use of simple design style, with black as the benchmark, making the screen and the border better blend into one, resulting in boundless illusion, giving the first visual impact is still very strong. The body-thickness aspect of the K55 is not a slim body, but it does not look bloated from the side. 
Most consumers have relatively high requirements for the thin and light characteristics of TV panels. After all, thinner TVs are more beautiful. The narrower the frame is, the better the effect of viewing the screen is. Cool open K55 is still very good on the thin and light features of the panel, 12.7mm wide panel is also in the upper level of similar products 
Cool open K55 backplane is very flat, the embodiment of the exquisite craftsmanship of large manufacturers, the middle of the backplane is the electrical nameplate of Kukai K55, you can understand the production place, model and power parameters and other information. 
Cool open K55's base is made of high-quality alloy, the edge of the use of oblique grinding process, even more upscale, details also determine its exudes a strong flavor of fashion technology. 
Interface, cool open K55 continuation of the cool open TV simple interface style design, has two HDMI1.4 interface, a USB2.0 and a USB3.0 interface, as well as AV input and output interfaces and network interfaces. The interface level is sufficient. 
Cool open K55 remote control is a new design of the remote control, with cool open K55 silver black color match, the softness of the button is quite good, but the fly in the ointment is that this remote control does not have voice function buttons. 
Summary: Cool open K55 performance in the appearance of the link is still excellent, silver and black two colors with the author's favorite flavor, not as traditional black appliances give people a feeling of depression, but will not be too fancy Is a simple style. However, there is no use for the appearance of light, quality and system can not be considered to be a good TV, the price of 2999 yuan will not lead to a decline in quality, immediately entered our quality evaluation link. 
Cool open K55 quality test
The test room was tested in detail using a professional instrument. During the test, we adjusted the TV to the standard image mode, the backlight was adjusted to the brightest, other defaults, and all the test items and the score results of the product were made into a five-dimensional performance chart. Put it on the map. 
After the evaluation of the instrument, the K55 data is displayed on the above table. In terms of color adjustment, the K55 color gamut value is 76.26%, which belongs to the middle level. Contrast, cool open K55 contrast ratio of 763:1, for this price TV, this kind of result is also expected by the author, the brightness of open K55 value is not particularly high, but there are also a lot of brightness in the measured The products that are not high but have excellent image quality, so the specific performance is left to the light control link.
Cool open K55 power test 
In terms of power consumption, the rated power of Coocaasure calibration is 150W. From the data of the power meter, it is basically consistent with the nameplate data, and the energy consumption is not very high. Therefore, the power consumption link author gives it a score of 8 points.
Color performance test 
Cool open K55 color gamut value is 76.26%, from the color transition of the screen, most of the color transition is also very harmonious and natural, pure color of the color reproduction is also relatively high, but some areas, such as the excessive between yellow and green is not Especially ideal, but this performance has been considered very good in the same price range. It can be seen from the shape of the pixels that the K55 should use the LG Display Panel. 
In the aspect of color consistency, the result of the machine evaluation is qualified, the test value of brightness uniformity is also ideal, and the overall consistency is very good. 
In the silk standard test screen, we can see that the cool open color reproduction ability is quite good, the color is soft and natural, the different shades of the same color can be well distinguished, there is no color cast, details of the portrayal Also very delicate 
From the standard test screen of the yarn ball, it can be seen that basically all the colors can be well restored, the blue plush ball in the middle has a slight color cast, and the right bottom corner of the red pink yarn ball does not have obvious stickiness. District, outstanding performance.
Summary: In general, the cool color of K55's screen color reproduction is still very good, this point can be seen in the measured picture, so in this link I give cool open K55 8.0 score.
Light control performance test
Brightness test We only adjust the backlight to the brightest, but the brightness value uses the default value. This brightness looks more natural. The brightness parameter of the screen is not the decisive parameter of the picture quality of the TV. Even if the brightness of the screen is low, due to the problem of the factory setting of the panel, products with low average luminance but excellent final picture quality are not uncommon. Seeing the picture of the cool open K55 white screen is very good, the picture is clear and detailed, all kinds of white and gray are very well distinguished. 
In terms of grayscale performance, Kukai K55 performed very well and basically all the grayscales can be distinguished very well. 
Fortunately, the light leakage is fairly even, and the impact on the picture quality will not be too great. 
In the black and white standard test screen, we can see that the cool open K55's black and white screens all perform quite well. In the charcoal part, the details of the dark part on the left side are clearly presented; in the Tokyo tower part, the darkness of the middle billboard is clearly differentiated, and the black part of the sky can sink down; in the black and white dress lady test screen, the details of the dress of Ms. Bai are not Mixed with the background, the distinction is ideal, and Black's black dress can also be clearly distinguished from the background.
Summary: Although the cool K55 is very good in the black and white standard test picture, but because of the slight difference in the average brightness and the total black light leakage, the author's light control section gave the K55 8.0 score
Dynamic performance test 
As can be seen from the 100% zoomed train test chart, the brightness of the entire picture and the saturation of the color are high in the house and branch parts seen through the high-speed train window. Performance, the author gave him 7.5 points.
Screen shot proofs
The dynamic effect of the overall picture is still ideal, but the color is affected by the value of the color gamut. It appears that the saturation is a bit low and the picture is cold.
Summary: The dynamic aspect is considered to be a bit of a disadvantage for CoolTV K55, but the overall performance does not appear to be a big drop. It is relatively stable, and it is very good in the same price range.
Cool open K55 HD resource playback test 
Since the output resolution of CoolKeep K55 is 1080p, there is no way to support 4K video playback. From the perspective of 1080p video playback, Kukai K55 can display the details of the picture well, and the color saturation of the picture can be reduced to each other. It is also ideal.
Local HD picture playback test 
From the display effect of the 4K image, the cool open K55 color reproduction capability is quite good, the picture is very natural, and the details are not affected by the resolution.
Summary: Although do not support 4K resolution output, but cool open K55 is still a good 1080p resources out, and in view of the current domestic online 4K resources are not universal, broadband speed has not been significantly improved, buy a A good 1080p TV is also a good choice. 
Cool open K55 intelligent system evaluation
The Kukai K55 is equipped with a cool open [color=rgb(68, 68, 68) !important] smart TV system that is well-known for its abundant resources and smooth operation. The first thing to see is the overall system classification, and the cool open smart system. The content is divided into five sections, namely "Film and Television", "Education", "Application", "Mall" and "Tourism".
In the "Film and Television" section, there are a large number of movies and TV drama resources, users can click to play according to their own preferences, and the launch of the "Starting Cinema" content in the forum has movie resources hit by major cinemas.
The application board provides a large number of games and APK application downloads suitable for TV use. Users can download and install them on demand. The 4G flash memory is also sufficient for most game installations and operations.
In addition to the "Film and television" section, there are "educational" sections for children and families, a large amount of teaching resources, interesting teaching examples, and truly fun lessons. Parents are also more relaxed and happy with their children.
TV-side shopping has become more and more popular, and more convenient and user-friendly than the traditional TV shopping guide, cool open K55 in the "Mall" to integrate the major TV malls to buy the main TV store, daily discount to enjoy non-stop.
The "Tourism" section provides users with some travel spots that are currently suitable for travel. At the same time, it also provides access to information such as flight inquiries and preferential consultations, which is convenient and quick.
Kukai K55 has implemented real-time push upgrades in software upgrades. Users can upgrade the TV system to the latest version with a simple click. By using a mobile phone to scan the QR code to install a dedicated APP television pie, you can use the mobile phone to control the TV for program browsing, and also can push content on the video website, or push the local resources of the mobile phone to the screen, allowing the user to experience the convenience of sharing. With fun. 
Summary: The fluency of the smart TV operating system that has been systematically opened has been a very deep influence on the author, and the abundance of resources is also satisfactory.
Cool open K55 evaluation pros and cons summary
advantage:
High cost performance
2. Strong entertainment, system fluency;
3 using full HD display quality backlight module LED lamp beads
Disadvantages: Does not support 4K and H265
Appearance, cool open K55 design has obviously spent a lot of thought, narrow panel box design, black and silver and silver color with IPS hard screen wide viewing angle is the point of this praise, quality performance links, color gamut Although there is still room for improvement, the detail and color reproduction of the picture are still in place. Although there is a light leakage phenomenon in the light control, the distinction and details of the black and white screen are the best in the same price range. Naturally, the system does not need much. Say, the fluent operating experience and massive resources have left a deep impression on the author. In general, it is still a very worthwhile TV.
The price of 2999 yuan to buy cool open K55 worth the price? Believe that the 618 record has already told us, cool open K55 is the real king of cost-effective, there may be a friend that coarse-grain TV and LeTV or 4K TV, it is not as good as the cost of open K55? According to conscience, as a tester of all three televisions, I feel that Xiaomi and LeTV don’t have technical accumulation in television, and their concentration is not enough. The actual experience of natural products will still clearly feel the gap with traditional home appliance companies. However, it does not matter. The price and test performance are here. The value is still not worth it. Everybody has the final say.
Cool open k55 most comprehensive hardware evaluation
Cool open K55 PConline quality test data