The original innovator PANDA Panda LE65N88S-UD LCD TV and comment

(This article features more pictures, the first half is open, the latter half is a short review. Drag the right scroll bar to the middle of the page to quickly jump to the evaluation content)

The winter is approaching, the sunshine is shortening, the temperature is lowered, so more free time is spent at home and needs a TV to pass the time. For this reason, the low budget and low expectation have become my buying direction. After continuing to focus on Zhang Aunt for a while, the protagonist of this article: Panda LE65N88S-UD 65-inch Samsung 4k LCD TV, gradually being included in my watch list, coincided with the historical low-cost news, did not hesitate to order .


Thanks to Jingdong's strong logistics system, I am here at 7th-line Xiaoshan Village. I received the order in the morning on the morning of the order. I used the factory's customer service to make an appointment to install it. Unpacking, putting on the wall, signing the bill, charging (50 yuan is considered to be fair price), everything is agile, and I did not have time to take photos carefully.

â–²List of charges

â–² outer box, relatively low-key.

â–² There is less information at the seal and no information such as origin/factory date is indicated.

â–² Random attachment list: two base brackets, all metal material, texture is still acceptable; manual warranty card is complete, with 2 av line; remote control is normal, but the button is sensitive, crisp and soft feedback, feel better than telecommunications much better.

â–² The bare screen has a slight mirror effect under the power-off condition, which shows a deep darkness and inevitable reflection phenomenon. The screen is soft and the fingers will have water ripples. There are white warning labels on the top, bottom, left, and right sides of the new aircraft. All of the evaluations in this article did not reveal them. (At the time forgotten to shoot, make up a screen reflection effect picture)

â–² The body adopts a narrow frame design, and the metal sandblasting process has obvious gaps in some areas. The overall use of three-dimensional color design within and outside the box, close view texture is poor, easy to fade, far from the overall harmony is not bad. (Not taken when out of the box, after the completion of the map)

â–² The back of the fuselage is made of plastic material. The heat dissipation port is designed reasonably. Through the gap, you can see the main board fly line. The interface layout of the airframe is a traditional layout, and the interface design is reasonable. There will be no usb interference. The aircraft is equipped with hdmi2.0 interface, usb3.0 interface power supply measured to meet the continuous read of 2.5-inch mobile hard disk.

â–² TV body power button is located on the lower right side of the body, easy to find. The lower left side is the power light. After the power key is turned on, the front light of the TV is not turned on. The light is always red, and it turns off automatically when the power is turned on. Any key on the remote control can trigger the red light to flicker. This design can be considered humane.

â–² The wall-hanging process was skipped. After the TV was combined with the white latex paint wall without any decoration (don't ask me why I didn't decorate, I wouldn't tell you because of poverty). The overall harmony was considered satisfactory.

â–² Because the thickness of the bracket and the TV are thick, the thickness is not ideal from the side, but it is not unacceptable.

â–² power, boot, first display a panda static Logo, about 8 seconds into the boot animation (Figure, in fact, is to read the scroll bar), into the desktop cumulative use of 25 seconds, faster than expected, after all, is the Android system, The boot speed is not expected to be high. (When you use it for the first time, the Setup Network Wizard will appear. Use the remote control to easily complete the operation.) The entire boot process has no ads, no pushes, no sounds.

â–² The default home screen is iQiyi. There is no live channel because the player does not give any members. Therefore, any content on demand must endure long advertisements. Even more unbearable is the switch to the movie page. There are 9 movies in 10 movies. VIP charges resources, think of money as crazy. This kind of real (ji) software style, I will not map, so as not to disappoint.

You can switch between other home screens with the left and right buttons on the remote control.

â–² Take a look at this children's channel. Resources include: children's songs, nursery rhymes, idioms, nature, and learning. Some of the content is pure and free, low-definition video, clear voice, no advertising, fast buffering. The other part, such as classrooms, is a charging resource. The fees are very expensive and pit money is not discussed. In general, this feature is still available, especially for families with young children.

â–² Another, more common interface is the list of all programs. This contains some of the pre-installed procedures, such as great wisdom, can not be uninstalled can not be disabled, but do not pop the window does not push, not too annoying. The system does not have a built-in browser. The first-time installation of a store/desktop Launcher application needs to go through a U disk, and then it is the same as an ordinary installation box.

There are 4 shortcut keys on the remote control, but the method for binding the application to the shortcut key cannot be found, so each time you want to open the self-installed application, you need to press the remote controller one level at a time to enter (one of the failures).

The TV's input signal source is made into a separate home screen, which can be viewed with the remote control. It is worth mentioning that Panda TV can remember the input source, that is, if an external box is used, then every time you open an opportunity to automatically enter the box content, you don't have to look for a menu switch on the TV.

â–² On the built-in Android settings interface, fewer content items can be set.

Then put a random gift box out of the box, because it is a gift, there is no high expectations. In fact, a single appearance of good value, mirror paint material, can be wall-mounted, with remote control.

At this point, the unpacking section ends.

In summary, the value is fair, the design is reasonable, the craft is general, and the ease of use is good.


/********************** Although Aunt does not like dividing lines, I still want to show my face naughty *************** ************/


Evaluation section:

Since I was in contact with large-screen LCD for the first time, the evaluation knowledge was lacking, and there was also a lack of horizontal machines of the same type as a comparison. All of the following remarks were based on my subjective feelings and were for reference only.

A. Basic screen quality

1.1 From the easy start, the first thing to test is true or false 4k, because the official page has never mentioned RGB, so there is still some concern in the heart. Without reliable shooting equipment and macro lenses, you can only shoot at a good angle.

â–² The result is obvious, no white pixels, non-rgbw screen.

Then test whether it is true 4k or 1080p, directly use the common resolution test chart.

â–² clear lines, sharp text, 4k resolution test passed.

1.2 Screen leak test. The external environment turns off the lights at night, and the high ISO holds the AI ​​block to shoot, so the picture is slightly more palatable than the actual perception.

â–² There are different levels of light leakage in all four corners, but it is not so obvious. However, there are 3 hidden corners in 3 of the 4 corners. In the actual experience, the light leakage is hardly noticeable. However, the dark corners slightly affect the perception.

1.3 Color balance (pure color) test.

â–² It can be seen that in all cases of solid color, there is a case where the center brightness is high, especially in the blue state.

1.4 color scale test.

â–² dark gray to black color level is excellent, light gray to white color level is poor.

1.5 color saturation and color over test.

â–²Saturation can't be judged as good or bad, and the transitional coherence is not bad. There are no obvious vertical bars.

1.6 Jitter test.

â–² Actually no jitter (no flashing light bars), limited by the camera, poor filming effect, the actual experience of this excellent.

1.7 Dynamic backlight/Region control test.

â–² When the dynamic backlight is turned on/off, the overall backlight changes when the screen is observed with/without the presence of a small white block on the black background and the movement is generated. The results show that the dynamic backlight exists, but the light and dark changes in the overall backlight, and there is no partition control light blessing.

1.8 black and white contrast. (Invoke the built-in screen saver image, non-test software generation, found GB and Gb yet, the manufacturer JS exposed the nature)

â–² Backlight brightness is 100% to view this picture, which is extremely dazzling; lower the backlight to 50, barely accept it, and look dazzling for a long time.

1.9 Visual angle test.

â–²Estimated excellent (non-discolored) angle within 150 degrees, will see a clear color cast near 170 degrees (picture whitening), as a television device, this viewing angle is enough.


II. Static picture

2.1 People/Landscape/Text, Browser Mode, FHD Pixels.

In order to eliminate equipment interference, a screen shot of a laptop screen is specially placed as a comparison:

â–² In contrast, the characters on the TV screen are not natural enough, and the green plants lack the sense of hierarchy. The text on the text page is slightly weak and the sharpness is not enough. The text part can be solved by raising the sharpness in the menu, but after the sharpness is raised, the character display is even worse.

2.2 Nature / Architecture / People / Still Life / Candy Colors, Player Mode, 4k pixels.

â–² Visible pixel enhancements in the image source file have a significant effect on image quality improvement. The figures in this series of figures are natural and the blue effect is excellent, but the white part is white and the details are lost. The best is the performance of candy colors, which can be described as excellent.

2.3 People's face details, player mode, BD/1080p video source, mainly test the effect of 2k to 4k.

â–² The facial details of the characters on the screen are fairly good, the colors are accurate, and the layers are clear, but there are still problems of losing details in the highlights.

2.4 facial details, player mode, 720p video source, the main test 1k 4k effect.

â–² The film source is a 720p movie with 4.4GB capacity. The theoretical image quality should be acceptable. However, I will not comment on the actual results. 100% no picture quality processing chip! Welcome to see the students using their own television to compare tests.


Three. Dynamic picture

3.1 The dynamic picture is difficult to present with the actual perception of the picture, so this part is completely subjective and does not give any details. The following pictures include: live broadcast by TV stations, video on demand (usually lower than the 720p/4.4GB standard for testing above).

â–² Personal feelings: The subject of small motions in the picture (such as football) is compared with the subject of large motion (such as the running animal, or the person under the lens stretching switch, the singer in the above picture), the drag of small objects The shadow is not obvious, and it hardly affects the visual experience. The sense of smearing of large objects is slightly heavy. When the severe shots are frequent, there is a feeling of dizziness and eye fatigue.

Subjective sensations also have a great relationship with the level of the source code rate. High-rate programs (such as ultra-clear on-demand programs), because of their higher frame count, less smear, low-rate programs (such as live broadcast), Due to the fact that the number of frames itself is already low, the effect of the playback is very poor.


Four. Hardware performance

4.1 Decoding capabilities

Constrained by the speed of small pipettes in remote mountainous areas, this test has only limited sources: 4k videos, bd/1080p source, 1080p high rate tablets, 720p.

Use the built-in media player/Kodi player separately, the source files are placed in usb2.0/usb3.0/samba (newifi official firmware comes with usb2.0 interface), and the network uses the cable/wifi test respectively.

Conclusion: This machine does not support decoding dts audio track; 2.4G wifi bandwidth is sufficient to support nas 4k playback; built-in player decoding capability is strong, there are some problems with Kodi compatibility.

4.2 System fluency

Are single-process operation, unclear memory, TV common software (the top five television stores are ranked in the top 5 are tested) running very smooth, without the slightest lag. The hardware of this machine is the A53 core of CPU, which is higher than the theoretical performance of A7 chip of God Box (telecom 4k set-top box).

However, in the daily operation, there have been several crashes, the specific performance of the frozen screen, press the remote control volume / menu / back / home no response, press the shutdown button to accept the shutdown command, but according to the severity of the crash Wait for 3 to 10 seconds to shut down the black screen.

4.3 Games

I am very sorry, because I was really uninterested and I have not tested it.

4.4 Other functions

Miracast, the test was successful, the sync speed was ok with the screen, and there was no disconnection within 15 minutes of the test.

Dlna/airplay, not supported.

Listen alone, one of the function menus. Press the button to completely turn off the backlight, leaving only the sound. Press any button on the remote control to return. There is a certain practical significance.

Sharpness, one of the function menus, 0 to 100 adjustable, for noise reduction processing for low 4K signals, the actual effect is similar to the soft light and sharpening filters in PS, it is recommended to adjust to 0, otherwise it is highly likely The figure's skin is full of pockmarks.

Image Noise Reduction/Scheduled Shutdown, Second of Function Menu, I'm sorry, these two functions were not tested successfully during my test and have no effect.


V. System BUG

The following three system bugs have been verified with the manufacturer's customer service center/area after-sales service center. The non-malicious comments are non-malicious. Customer service indicates that these minor issues do not affect daily use. If you have questions, you can call the official customer service to verify.

5.1 When using the built-in system, the remote controller menu key cannot be used.

Some of the function menus mentioned in the previous section, as well as image adjustment functions (such as brightness/contrast/saturation, etc.), are not programmed into the Android settings. The only way to do this is to click on the remote control's menu button to perform the selection adjustment. Pictured:

But the menu keys cannot be called in the built-in system (including the pre-installed app and the user app), which means that these parameters cannot be adjusted when using the built-in system.

5.2 System does not have hdmi overscan switch

For hdmi overscan students who are not yet clear on what they mean, you can refer to this article first:


The hdmi overscan of the original firmware is turned on by default. When some hdmi input sources with imperfect drivers are connected, the image displayed on the screen is incomplete or cannot be displayed point-to-point. As shown in the following figure, the TV cuts up and down the left and right sides of the original image by about 10%. All built-in zoom modes have been debugged, and the screen cannot be displayed properly.

If the HDMI signal input source is a desktop computer, the graphics card management program can be used to disable the overscan when the PC graphics driver is perfect. However, there are quite a few devices in reality that are not perfect, such as: low-level versions of Macbooks and low-level versions of Mac OS, desktop PC graphics cards that have to be driven down for a certain game, and TV boxes with inadequate functions.

If the manufacturer can add this switch function in the firmware, then any of the above imperfections will not affect the final result. According to Google, such brands as SONY have built this switch.

5.3 TV does not have engineering mode

Most brands of TVs can use specific remote control buttons to enter the engineering mode, where you can view additional information such as time of use, panel information, etc. Individual brands can even adjust the refresh rate, rgb channel, gamma curve, etc. These options are for certain Experienced users can enhance the experience. At least, the existence of this type of model may solve the simple problem of system failure due to system crash (such as the Android phone's long press power + home forced restart).

But this Panda 65-inch TV, the manufacturer customer service informs, this machine has no engineering mode.

A bit small, not convinced, tried various combinations of their own, still can not find the password of the project mode. Instead, it has found a way to enter the Android security mode (can be used to solve the failure due to the Launcher can not enter the system): press the menu key repeatedly after boot to enter the safe mode.


Six. After sales evaluation

All of the above, let me start the meaning of return, originally signed on the day has been found to have a very insignificant dark spots (there may be a group = 4 pixels, the installation master made a report, confirmed as a dark spot), in order to Successfully passed the return application and started to check the screen again 360 degrees. The results are really new:

In the black screen state, there is a clear horizontal ripple in the screen, and a vertical dark line in the center of the screen, even the slag camera on hand can shoot the effect. However, in the non-black screen state, even if it is #111111 dark gray case, there is no such situation, so it is presumed to be the cause of the backlight. Because this machine adopts the partition direct type backlight, the position of the abnormal picture in the picture may just be the boundary position of the backlight partition (purely personal guess).

Followed by the return of the standard process, open the test list, take the door away, after-sale review, arrange a refund. During this period, I told JD.com/manufacturers several times that I would like to leave a TV. I only wanted to upgrade the firmware to resolve the above 3 system bugs, but I was unable to receive any useful reply and had to return it. Ps, during a communication with JD.com, was informed that JD.com did not provide after-sales follow-up of any television software and only provided mobile phone software after-sales service. I was also drunk.

Throughout the entire return process, Jingdong/manufacturers actively cooperated and the attitude was good. However, the local sales were relatively delayed and the outlets could not be called internally. After being confirmed as non-manufacturers of the contractors (7 sadets and resentment), the final processing was Still basically satisfied.


Finally, in order to complete the small partners who only want to see the results do not care about the process, summed up in one sentence:

This is a workmanship is acceptable, the appearance is not ugly, hardware (this year) enough, the system has BUG low-end machine, high-definition picture is excellent, online video screen to fight character, dynamic is not picky available, aftermarket credible TV.

If I see the news of 3600 send audio, based on the 65-inch 4k which is the lowest price of the whole network, I will use a value. But if it's higher than 4,000 yuan, I will be worthless.

Lead Free Piezoelectric Elements


The Co-Al Co-doped Barium Titanate Lead-free Piezoelectric Ceramics was successfully developed by Yuhai company through repeated experiments. By Researching the influence of Co-Al Co-doping on the structure and properties of Barium Titanate-based piezoelectric ceramics, the formulation and preparation technology of Barium Titanate-based piezoelectric ceramics were optimized. Yuhai`s BaTiO3 was prepared by conventional solid-phase sintering method, with the piezoelectric constant d33 (>170pC/N), dielectric loss tgδ≤0.5% and mechanical coupling coefficient Kp≥0.34.

Barium titanate lead-free piezoelectric ceramics are important basic materials for the development of modern science and technology, which was widely used in the manufacture of ultrasonic transducers, underwater acoustic transducers, electroacoustic transducers, ceramic filters, ceramic transformers, ceramic frequency discriminators, high voltage generators, infrared detectors, surface acoustic wave devices, electro-optic devices, ignition and detonation devices, and piezoelectric gyroscope and so on.

Application: military, ocean, fishery, scientific research, mine detection, daily life and other fields.

China Patent of Yuhai company`s BaTiO3

Chinese Patent No.: ZL 2011 1 0126758.6

Name: Lead-free Barium Titanate Piezoelectric Material with Addition of Cobalt and Aluminum

8



Lead free piezo material BaTiO3

Lead-free Material

Properties

BaTiO3

Dielectric Constant

ɛTr3

1260

Coupling factor

KP

0.34

K31

0.196

K33

0.43

Kt

0.32

Piezoelectric coefficient

d31

10-12m/v

-60

d33

10-12m/v

160

g31

10-3vm/n

-5.4

g33

10-3vm/n

14.3

Frequency coefficients

Np

3180

N1

2280

N3

Nt

2675

Elastic compliance coefficient

Se11

10-12m2/n

8.4

Machanical quality factor

Qm

1200

Dielectric loss factor

Tg δ

%

0.5

Density

ρ

g/cm3

5.6

Curie Temperature

Tc

°C

115

Young's modulus

YE11

<109N/m3

119

Poison Ratio

0.33


Piezo Element,Piezo Ceramic Elements,Piezoelectric Ceramic,Pzt Tubes

Zibo Yuhai Electronic Ceramic Co., Ltd. , https://www.yhpiezo.com

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