Established a new benchmark in the industry Lenovo TV 55K91 regular evaluation

[PConline evaluation] Nowadays, intelligence continues to infiltrate into various products. If you use a cell phone that is not a smartphone, you have Altman, but for the TV product as a home entertainment center, the configuration of the smart function has been Gradually become the mainstream. The competition in the TV industry is no longer simply a competition between hardware, but rather a competition in soft power between operating systems based on operating systems, content, software, and chips. Because of this, Lenovo, Apple, Google and other IT giants have set foot in the field of smart TV, trying to steal the TV market through software strength.

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As early as CES2012, Lenovo demonstrated its first smart TV K91. At that time, it caused a lot of sensation. Everybody was full of questions and expectations about this traditional IT giant's involvement in the TV field. In the end, what kind of smart products Lenovo can create? What? Presumably everyone has long waited for the K91 review. In order to let everyone know more about the Lenovo smart TV 55K91, this review will be divided into two parts, namely the conventional performance and features. Today, it is the basic part of appearance, quality, etc., which will be later. App application, network video works, voice input and other intelligent functions.

List of hardware parameters

Lenovo launched a total of three smart TVs, K91 positioned as the flagship product (K81 and K71), configuration is certainly not ambiguous, using the Android 4.0 smart operating system, the industry's first dual-core 1.5G processor, support for voice input function ( In addition, it also has a 5-megapixel camera. At first glance, its configuration is more like a high-end smart phone.

Appearance: Stable to win

Today, ultra-narrow borders are prevalent, but Lenovo does not blindly follow the trend. The design of the K91 is steady, the screen is covered with a black acrylic frame, and the outermost layer is wrapped in hard brushed plastic. The biggest feature is the silver wingspan, Lenovo K91. The overall work is solid and the texture is excellent.

Lenovo smart TV K91 positive

From a positive point of view, it can be found that the bottom border of Lenovo K91 is the most generous, and there are no logos on the upper left, lower left, or upper right of the frame, and there are infrared sensors and other devices at the lower right to identify somatosensory operations and remote control signals.

Lenovo K91 upper left border

Lenovo K91 bottom right border

The base of the Lenovo K91 is quite special. It uses an oval chassis and a wing-type bracket. The bracket is made of metal material. It seems that Lenovo sees it as an eagle flying wings. There is a 5 million megapixel camera below the LOGO. Only video features may be added to gestures and more in the future.

Lenovo K91 Wing Base

Lenovo K91 camera below the LOGO

Lenovo K91 uses LED backlight, body thickness is 38mm, compared to other flagship products (such as Samsung 55ES800 is 30.8mm), its thickness control is not outstanding, but I think this thickness has been fully able to meet the consumer The thinness of the TV is required.

Lenovo K91 thickness indication

The K91's back design is quite simple, with a ferrous metal covering, with the big sign of Lenovo's "lenovo" in the middle. From the body nameplate, it is from TPV (Xiamen).

Lenovo K91 on the back

Interface: Rich Dual Zone Design

In terms of interface design, the Lenovo K91 has two major regions, namely the English alphabet “D” and the reverse “L”. It has 4 HDMI, 4 USB, 1 LAN, 1 VGA, 1 Group color difference, 1 set of AV, 1 set of LAN, 1 set of fiber output, 1 set of RF TV input and 1 set of 3.5mm audio interface.

Lenovo K91 "D" type interface

Lenovo K91 anti-"L" type interface

Lenovo K91 anti-"L" type interface

Remote Control: Tradition and Somatosensory

The Lenovo K91 is equipped with a remote control and an individuation gamepad. The traditional remote control looks like traditional, but it integrates various shortcut keys. It also supports voice input and touch operation, and the touch area is set in the middle.

Lenovo K91 remote control

The somatosensory gamepad uses an oval-shaped rectangular design, buttons are also relatively complete, grip is quite good, to cope with a variety of games more than enough.

Somatosensory gamepad

Editor Comments: In the design, although the Lenovo K91 is not very stunning design, but the overall fluency and simplicity, the most eye-catching is its wing-style metal base, giving a steady feeling but still stylish, details The workmanship is also very good, we can see that K91 is a product that Lenovo has a lot of care for.

Interface: Innovative Sandwich Design

Lenovo K91 operating system is based on Android4.0 modified, is designed for the television to create a smart operating system, using a sandwich-style interface, simple to understand, is the main interface on the interface of the three major blocks, respectively, VOD online Video on demand, TV and applications, the three can use the remote control's navigation keys, or touch the area to switch, intuitive and rapid switching process.

Lenovo K91 user interface

There are weather information, time, and other information on the user interface. In the application interface, you can select local applications and online stores. The operation is quick and easy. Click to enter the music store, which has seven levels of classification tags, namely recommendation, ranking, special topics, games, education, applications, and personal centers. Users can quickly select the corresponding applications according to their needs.

Application store

Application Management Interface

The Lenovo K91 supports application stores, and about 100 models of applications have been built into the factory. Users can also download and install other adapted applications.

Baidu map

Voice input function

Lenovo K91 provides users with a cloud-based voice search function, which greatly simplifies the tedious text input. As long as the user holds down the microphone button on the remote control and speaks the name of the movie or video of interest, idea TV can quickly find the corresponding content and play it according to the user's voice command. From the actual use, the recognition rate of voice input is quite high. (The specific operation process will be displayed in the future feature evaluation, please continue to pay attention to our article)

Voice input function

In some interfaces, such as maps and browsers, the remote control of the K91 will appear as a cursor on the TV screen. Users can control the cursor by moving the remote control, just like controlling the mouse.

Mouse-like cursor

Online video: BesTV platform

Lenovo and BesTV network platform cooperation, launched a custom Lenovo online on-demand content, with more than 300,000 hours of genuine high-definition film source. Lenovo K91 can adaptively optimize the stream according to the user's network conditions, automatically select the most appropriate video quality, and ensure the smoothness of the playback. From the actual playback point of view, most of the video playback speed is relatively fast, while the small part needs to wait for a long time, but this is also related to the speed of the Internet.

Lenovo and BesTV cooperate

Lenovo K91 Online Video On Demand

Lenovo K91 Online Video On Demand

Edit Comment: Lenovo K91 innovative use of a simple and intuitive sandwich interface, to achieve the traditional TV programs, online video on demand and Internet applications, the three major functions of rapid switching. The K91 supports voice input function (HKUST's interactive solution), allowing you to easily input desired content. As for online video, it provided more than 300,000 hours of genuine HD source, and at the same time optimized the processing to reduce the waiting time for watching videos.

Point-to-point/panel/power test

Full HD point-to-point test

In the Monoscope full HD 1080p signal test, the Lenovo K91 performance on horizontal lines, vertical lines, slashes, circles and other lines is outstanding, only some of the 1080p lines there is some adhesion phenomenon.

Lenovo K91 full HD point-to-point effect

Light leakage test

We made the test television show a black screen to test the backlight leakage problem of LCD TVs. Can be seen from the figure below Lenovo K91 appeared uneven backlight phenomenon, the brighter areas are mainly concentrated in the edge, but the overall situation is still acceptable, after all, light leakage is a common problem of LED-backlit TV.

Panel pixel test

The following is a close-up picture of Lenovo's K91's LCD panel pixels. Through the macro lens, we can clearly see the liquid crystal particle array status of the entire panel. From the pixel point of view, the white screen red, blue, green three-color rendering ">>>" shape, you can judge it as IPS hard screen panel.

Lenovo K91 panel pixel close up

Actual power test

The author uses the instantaneous power consumption test method, which is to measure the power consumption values ​​of the six screens of red, green, blue, white, black and color transitions in the standard mode.

Lenovo 55K91 power consumption test

From the actual test results, the Lenovo 55K91 in the standard image mode, the power consumption of the six screens between 126W to 145W.

Edit Comment: Lenovo 55K91's peer-to-peer effect is excellent, using the IPS hard-screen panel, and power consumption is much lower than the rated power consumption, basically maintained at about 140W, for a 55-inch large-screen TV, so The data is not high.

Grayscale / color / dynamic test

Since the screen shot has undergone the necessary software processing and is affected by the actual effect of the netizens' display, the screen displayed on the screen will eventually differ from the actual effect of the TV. Therefore, the actual effect is based on the author's text description. The author uses a Hi-Definition Reference Disc test disc, Sony PlayStation 3 as a Blu-ray player. The digital camera was shot with a Canon 7D and the lens used a Canon EF-S 18-200mm f/3.5-5.6IS.

Grayscale comparison test

The first test is a 15-gradient grayscale test. From the actual picture, the Lenovo K91 is fairly happy, and it is easy to distinguish the gray level. The most obvious is the gray level of 0 and 1.

Grayscale comparison test

In the black grey tolerance test, the charcoal line fringe path is clearly seen in the charcoal backlight position; in the charcoal light position, the texture of the charcoal is good. In controlling noise, the Lenovo K91 performed well and the picture noise was not obvious.

Black tolerance test

Color performance test

For the color performance of the TV, the color that is most difficult to accurately display is golden yellow. Next, let's take a look at the effect of the Lenovo K91 on the performance of gold and black and white.

Color performance test

Color performance test

The two ladies holding the red, white and yellow roses are more accurate in their skin color, their hair color is more delicate and natural, and red clothes are a bit too bright.

Color performance test

Dynamic picture test

In this part of the test, you need to pay attention to the front door of the fast-moving train and the body plate of the car. I used the same ISO and aperture during the shooting process. The parameters are ISO-400 and F4.0. The time is 1/100 seconds. The author chose a sports scene during this evaluation process in order to make Lenovo K91 show the best dynamic effect.

Judging from the effect of the moving train, the contrast effect of the train is not obvious through the comparison of the houses behind it, indicating that the Lenovo K91's response time and dynamic display are also excellent.

Dynamic picture test

In the high-definition video of a section of vehicles that is played below, we need to observe the car's license plate and the outline of the car body. Lenovo K91 can play smoothly for the entire video, the license plate and vehicle contours are also relatively clear, and the overall effect is satisfactory.

Dynamic picture test

Edit Comment: Lenovo K91 can clearly show 15 gradient grayscale, black and white contrast, black gray latitude performance is fairly good, while the red and other bright images are a little too bright, due to the use of IPS hard screen and 240Hz speed drive, Lenovo K91 The dynamic effect is still relatively good, and the smear phenomenon is not obvious.

Not flash 3D screen test

Flash 3D principle

Lenovo smart TV K91 uses a non-flash 3D principle, that is, polarized 3D, is a passive 3D technology, using a physical principle called "circular polarizer", the light is divided into two clockwise and counterclockwise deflection direction. Clockwise light can only penetrate the corresponding polarized lens, and counterclockwise light does not. Using this principle, the images corresponding to the left and right eyes can be separated.

Flashless (polarized) 3D principle

The principle of polarization 3D TV is to add a layer of polarization coating on the screen, and the LCD screen outputs two different images in an interlaced manner. Through polarization glasses, the two images are simultaneously entered into the left and right eyes to form a 3D image.

Not flash (polarized) 3D left and right screen enters left and right eyes at the same time

3D Glasses Introduction

Lenovo smart TV K91 randomly distributes 4 pairs of 3D glasses, including one suitable for adult males, suitable for adult females, suitable for children and suitable for wearing glasses.

Lenovo smart TV K91 3D glasses packaging

Due to the non-flash type (polarized type) 3D, the 3D glasses do not require a battery and are light in weight.

Lenovo smart TV K91 is equipped with 4 pairs of 3D glasses

3D picture effect

After knowing the principle of 3D, let's experience the 3D picture effect of Lenovo smart TV K91. Since 3D picture is formed by the distance difference between the left and right eyes, it will only be seen when watching 3D images without glasses. Ghosting, different scenes create different 3D levels, so ghosting may not be obvious.

3D effect test (naked eye shot)

3D effect test (shot under glasses)

3D effect test (naked eye shot)

3D effect test (shot under glasses)

Editor Comments: Lenovo smart TV K91 does not use flash (polarized type) 3D technology, the screen does not flicker, high brightness, depth of field effect reached a higher level, random delivery of four pairs of glasses, for the average family, is enough.

Blu-ray HD disc test

In the high-definition video test section, the author tested the picture quality by playing a Blu-ray movie disc, and selected the action movie "Private Soldier" and the romance movie "Love the Universe." The first is the action movie "Private Soldier", with more screens and more dark shadows, which can better test the performance of dynamic and shadow details.

Blu-ray HD disc test

Next is the love movie "Love the Universe." The film is rich in color and has more natural environment. This will be able to better test the performance of the Lenovo smart TV K91 on color.

Blu-ray HD disc test

Edit Comment: From the above Blu-ray disc playback results, Lenovo smart TV K91 details of the dark part of the interpretation is in place, noise control is also relatively good, some of the screen will be reddish, the whole, to achieve the standards .

Streaming function test

Streaming media is already a standard feature of current flat-panel TVs, but the format supported by each brand’s products is different. According to the current situation, the streaming media capabilities of domestic brands are basically stronger than those of foreign brands. What will happen to the Lenovo smart TV K91? The following author tested it.

The Lenovo smart TV K91 is arranged in a grid format, and supports previews for video, pictures, and music. For movie format support, the K91 supports AVI/MPEG4/TS/RMVB/WMV/FLV/MOV formats, but the author only plays sounds and no pictures when playing MKV format.

Full HD video playback test

Full HD video playback test

Full HD video playback test

In terms of pictures, the Lenovo smart TV K91 supports JPG/PNG/BMP/GIF (showing only the first frame of static image)/TIFF (where GIF/TIFF supports 1024×1024 resolution).

Picture play test

Picture play test

In terms of audio, MP3/WMA/APE/DTS/PCM/AAC/AAC+/AC3 encoding formats are supported, and the song name and progress are displayed during playback. If there are lyrics, they will be displayed on the right.

Music Play Test

Edit Comment: Lenovo smart TV K91 grid layout makes people at a glance, preview thumbnail is quite practical, has covered most of the current mainstream formats, the actual playback smooth, operation is relatively simple.

PConline evaluation room summary

As the flagship product of Lenovo's first involvement in the television industry, the K91 has excellent workmanship and sophisticated details, which gives it a solid and solid feel. In addition, the powerful hardware configuration is shocking. The Android 4.0 system and the 1.5G dual-core processor are guaranteed. Its operating speed. The interface of sandwich is adopted, and six remote controllers such as aggregating touch, voice, air mouse, gravity sensor, smart keyboard, and traditional TV remote control are also provided, which simplifies the user's operation flow.

Lenovo 55K91 picture series evaluation forum offer online shopping Nett

Through the above detailed evaluation of multiple projects, PConline evaluation room on the evaluation performance of Lenovo smart TV 55K91 is summarized as follows:

At present, smart TV products all have issues such as speed and ease of use as the focus of research and development and competition, and Lenovo is a fledgling TV industry. However, after the actual trial, people feel that they are coming from behind. Let me remind you again. Next we will do an in-depth evaluation of the K91's smart features. Please continue to pay attention to our articles. [Back to Channel Home]

XPON 1GE ONU

The following analyzes the causes of ONU energy waste:
1. The interface is idle.
ONU generally includes multiple interfaces. Such as FE interface, GE interface, POTS interface, WIFI and IPlV interface, etc. In many cases, only part of the interface is used, and energy is consumed when the interface is idle.
2. Increased energy consumption caused by chip module design.
In the ONU design, the modules are usually divided by function and integrated on the same chip, controlled by an enable terminal. When power is supplied, the entire module needs to be powered, and the unnecessary functional blocks are also consuming energy.
3. Processing of OLT data.
Due to the broadcast transmission characteristics of the OLT, when the OLT sends broadcast information or sends information to a certain ONU, other ONUs that do not receive the information must also process it, resulting in a waste of resources.
4. Idle monitoring.
For TDM-PON, each ONU can only send upstream data in burst mode in a time slot authorized by the OLT, and the OLT forwards downstream data in the form of broadcast frames, which makes all ONUs always in operation. The ONU does not know when the user or the OLT will send data to itself. The receiving and sending modules always keep monitoring. When a certain ONU has no upstream or downstream data for a long time, the normal operating state will make it consume more energy.
5. Waiting time.
The structure of the PON system determines that the channel capacity should be shared between ONUs in the upstream direction. The PON system needs to adopt a certain arbitration mechanism to avoid conflicts. Each ONU is allocated a time slot, and frames received from users are buffered first. It can only be sent when it arrives.

Dual Mode Onu,Xpon Onu Router,Hybrid Gpon/Epon Onu,Dual Mode Xpon Onu

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