LeTV uMax85 Super TV: Significant Improvement in Picture Quality

Recently, LeTV has not been very peaceful. Although it has been on the headlines of major news media every day, the products have been dumbfounded. After a long period of silence, LeTV decided to come in big. On December 20, LeTV officially released the second device uMax85 under the giant screen. The same is the positioning of high-end users, today we take everyone first to experience the next.



uMax85

Exterior



uMax85

uMax85 TV uses 85-inch 4K LCD screen, three-dimensional 1904x1088x60mm, which is one meter long by nine, nearly one meter wide, 6 cm thick. With a base weight of 67.9kg, it is basically the same weight as a male man.



Music as LOGO and indicator

At the front of the screen is only the bottom LeTV LOGO and indicator light, which looks very simple.



Metal frame sanding process

The body uses a metal frame matte process, and the frame thickness is less than the diameter of a one-dollar coin.



6 cm body thickness

Due to the use of area backlighting, for those of us who are accustomed to watching a few millimeters thick TVs, the thickness of the 6 cm body is obviously missing some flexibility. However, the all-metal rear shell + arc treatment is not too bulky in appearance.



Back

At the top of the back is the heat dissipation area. The center still provides a USB interface for connecting the camera.



Back

At the bottom is the acoustic designed by Harman Kardon.



sound

The right side is the power interface and a row of commonly used operating entity keys.



Interface and physical keys

On the left is a common interface for TVs, including HDMI, USB, and so on.



Base

The base of the TV is inserted below, but for ease of installation, LeTV designed a wrench on the screw, which can be tightened by hand directly.




Base fixing screw
screen

Mention the picture quality can not but talk about this product's main division of the backlight technology. Before we talk about this, let's start with some background.



Area backlight turns on

First of all, the display device image is composed of a large number of tiny dots of different colors. We all know that we call each dot a pixel. The light of three colors of red, green, and blue is mixed in different proportions, and each pixel has a different color. Many people know this. In fact, light and shade are also one of the important indicators that influence color.


The principle of liquid crystal display panels has been described many times. In simple terms, one layer of liquid crystal molecules controls the ratio of three colors of red, green, and blue, and then passes through a white backlight, and the light passing through a certain angle finally shows color.

In traditional LCD TVs, the backlight always belongs to one brightness after starting up, the brightness of the display can be fixed, and the range of colors that can be displayed is also very fixed.

LeTV uses this partitioned backlight, and the backlight can also be adjusted for brightness and darkness. The brightness is automatically adjusted from a fixed three or four hundred nits to 0 to 1,000, so that the color is displayed more and the color gamut is wider.

In addition, different parts of the backlight intensity is not the same, so that the contrast of the overall picture has been greatly improved, the original black part of the picture has a more detailed performance, which is the HDR technology of the TV field in recent years.

Specifically, we use two maps for comparison, and set the camera to the same parameters as the M file. The first two are the effect of closing and opening the partition backlight.



Area backlight test 1



Area backlight test 2

It can be seen that the black background of the first map is obviously brighter than the second one, and it is particularly evident at the upper left.

With detailed parameters, the TV divides the backlight into 448 areas with a peak brightness of 1000 nits and a color gamut greater than DCI-P3 90%.

The above is hardware HDR. On the software level, 10Bit color depth can directly decode and display HDR content. For SDR content (in other words, old video signals, from black to white), it can also be converted into HDR content by a built-in algorithm. Specifically, after receiving the image, the image is first divided into 448 areas, the brightness of each area is analyzed, and the brightness of the backlight in this area is controlled, thereby enhancing the contrast of the entire screen.

LeTV said that this product has passed the dual certification of Dolby Vision and HDR10.

Then, in order to solve the fast motion picture, in order to ensure that the video is smooth and smooth, the MEMC motion compensation chip is certainly available. The principle is to insert automatically calculated images in two frames of images to achieve a coherent effect.

In addition, high-speed backlight scanning is added, and the picture can be up to 120 FPS refresh rate.

Relying on the MStar chip, the software also supports the 4K image capture engine, which can reduce image noise and optimize details. This is equivalent to performing a PS on each image frame separately.

Finally, the addition of the game mode reduces the image quality, but solves the problem of delays in host games such as PS4 and XBOX ONE.

Quality

Having said so much, we still have to look specifically at the performance.



4K resolution test
The first picture illustrates the clarity of the screen and it can be seen that the required level of 4K has been fully achieved.



Grayscale test

The second image is a grayscale test, which may not be very clear in the image. In addition to the obvious difference between 1 and 2 in front view, the other levels performed very well. The overall performance has surpassed most LCD TVs.



4K tone level restore test

The third view of the human eye to see the dark part of the bright part also exceeds the standard.


Color performance test

The fourth picture shows a relatively large problem. Although there is a perfect isosceles triangle between cyan blue, purple, and red, there is a major color reproduction error between yellow and green, and green has even appeared. Obvious sense of fault. The engineer said this is the reason for the engineering machine.



Color performance test
Configuration



The uMax 85 uses the MStar flagship chip 6A938 and is equipped with the Mali-T820 GPU. Supports 4K H.265 60FPS hard decoding. The video test of the roast duck was used to directly play back and forth without buffer before and after the video was played, and the smoothness of the image was not occurred during playback.



Roast duck video test

The TV also uses 4GB of memory and 64GB of high-speed flash memory. With the exception of the system footprint, the user's available space is approximately 50 GB. At the same time relying on large memory, so that the operation of the TV is also a lot smoother.



Built-in storage

The product supports the 802.11ac protocol and accepts and transmits 2.4 GHz and 5 GHz two-band wireless signals. Support low-power Bluetooth 4.1, with a separate Bluetooth antenna.

In addition, the product also supports DLNA protocol, Mircast protocol and Apple AirPlay. It can directly display signals sent from Android and iOS, and can display the content of mobile phones directly on TV.

system

On the system side, uMax 85 is equipped with EUI 5.8 based on Android 5.0. Its main feature is the focus page.



EUI 5.8

EUI's feature is that it reorganizes and aggregates information into separate pages for different user groups and different functions. Switch the TV's different functions by right and left.



desktop
In addition to the original carousels, search, and signal sources, it has been added to the sports, music, children, and shopping desks. Users can switch between different desktop settings in their settings for personal preferences for TV content and functionality.



Video content



Shopping Channel



Children's channel



Sports Channel

The difference between different blocks is not a pure content, but there are differences in picture quality and image processing. Just like on the children's page, the TV image automatically enters the eye protection mode to reduce the blue light.



One-touch exhalation game data

In addition, content-related information can also be easily accessed while viewing content. For example, when watching a football match, you can tap out the match data sheet, check the number of shots, and so on.

The addition of the stargazing system adds more tags to the video content, enabling more accurate user preferences and video content recommendations.



Speech recognition technology

In the end, LeTV also upgraded its speech recognition technology. Based on traditional semantic analysis, voice recognition was added. That is, different voices of men, women, and children can be distinguished, and the search results can be optimized and reordered.

to sum up:

The prices of upstream panels have tended to saturate and the market is actually saturated. Actually, in the current TV field, the days of Internet brands have not been better.

Area backlighting, MEMC, picture quality engine, etc., although it cannot be said that LeTV can override Sony Samsung LG's flagship product with this product, but compared with some manufacturers' concepts such as loud artificial intelligence, at least this is still a good direction.

As far as the specific experience is concerned, the uMax 85 has improved considerably in quality, system fluency, and functionality compared to other products in the company. Integrating its own price, it is indeed a relatively competitive product.

Smart TV/box information can focus on smart TV information network sofa butler (http://), China's influential TV box and smart TV website, providing information, communication, etc. on TV boxes, smart TVs, smart TV software, etc. Answering questions.

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