The trend of false advertising in China has indeed brought great convenience to product promotion, but it has let some powerful projects fall into dust. For example, players are embarrassed if they don't wear a sound without a hifi, and audio players can't come out to meet people without a hifi. It's like a hundred yuan XX magic mirror on the street, crying and shouting that they are imax screens, an unparalleled audio-visual experience, Over exaggerated advertising blurs the differentiation of products, and users even have a vague identification of products that really meet the promotion, which is impossible to distinguish.

In fact, HMDs have a long history. As early as the 800 * 600 era, both ATV and Olympus had done it. However, the price was high, the experience was mediocre, and only a small number of users had a taste of it. With the development of LCD panel technology, 320 * 240 portable HMDs have also blossomed everywhere, but the effect is only a toy, and it can't stay on the user's forehead, In 2012, Sony, a black technology company, launched the hmz series head mounted display with a single eye physical resolution of 720p, which focuses on professional personal audio and video The fourth generation of t2, t3 and t3w were updated, but the whole project was finally blocked by SONY because of the hard injury of wearing comfort and the market reaction of being neither hot nor hot. However, it can be said that it has occupied the leading position of professional audio-visual head displays so far. Just because of the unparalleled effect in the market, the hmz series has become a rare commodity due to the suspension of production, and the price has been inflated.

At the same time, the domestic VR virtual reality is also very popular. First, regardless of the foreign virtual reality hardware technology, Oculus HTC VIVE is in charge of it, but in China, plastic shell makers like Storm Mirror, Ant Vision, and PG are very popular. The most important thing to complain about is that they have no technical content. They also constantly update the money again. Apart from the selling points of virtual reality, they mainly focus on 3D movie watching and imax experience, ignoring ordinary consumers' mobile phones and eyeing natural mosaics.

Some people may doubt that it is not the full HD 1080p physical resolution advertised, but how the mosaic appears. First, use two pictures to explain the principle of vr.

▲ Since the current VR is based on the principle of single screen segmentation, even if the full HD LCD screen, only half of the screen can be seen with a single eye.

▲ That is to say, the boasted full HD LCD screen does not count the invalid pixels between the eyes, and the actual effective resolution of a single eye is less than or equal to 960 * 540, which means that even 720p cannot be reached.

But even if it is infinitely close to 720p, the box viewing of domestic VR virtual reality can not reach the effect of SONY HMZ series. The reason is shown in the following figure:

▲ Due to their respective lens principles, when VR is used for viewing, in fact, the 960 * 540 picture is larger than the user's field of view, while the effective resolution of the Sony HMZ series analog large screen is smaller than the field of view, which results in the pixel density of the head display of the analog large screen principle is much higher than that of VR products. It is also rumored that the actual resolution of the OLED screen used in the Sony HMZ series is higher than 720p, so the effect gap is immediately displayed.

▲ It can be seen from the screenshots of the simulation effect of OCULUS official simulator for VR resolutions that the 800p-2K screen can see obvious lattice, and the pixel density of the 4K screen will be less than the recognition of the human eye (the thumbnail may not be clearly identified).

In addition, the VR uses OLED screen, and the refresh rate and no glare can meet the VR demand. For the time being, only the Deepoon virtual reality of Shanghai Lexiang uses Samsung AMOLED, so in a word, VR development is not mature at this stage, and it is only limited to experiencing look around 3d and virtual reality games. If you want to use it for watching movies, you'd better avoid it, not to mention LeEco helmets and Rouyu, which make the FOV perspective smaller, but even the VR function is removed. They are simply not good at VR and watching movies. They are not as good as 2K VR all-in-one machines being developed by various companies.

Let's talk about the professional head display of the virtual large screen. In fact, there are also several models developed with full strength in China, such as Hi Mirror, which is going to be the leader in this "no return" road. Although the SONY HMZ head display project has been cut down, it has become the final conclusion, but following the 0.7-inch 720p oled, Sony has also developed a 0.7 inch 1080p physical resolution OLED screen and opened the sales channel. However, only Sony has the production capacity of this screen so far, so it does not hinder Sony from continuing to affect the development of the head display. According to the grapevine, these two screens are also priceless. This time, we have the honor to try Hi Mirror to see whether the continuation of the myth of the hmz series can continue.

▲ The evaluation of Hi Mirror is a trial production version in December, which should be said to be infinitely close to the mass production version. The positioning of Hi Mirror is different from that of SONY HMZ series. SONY HMZ series focuses on professional audiovisual, with its own decoding equipment, and pursues the ultimate audiovisual experience, while Hi Mirror prefers outdoor audiovisual, increases diopter adjustment, and has its own Android platform video source with lithium battery.

Hardware:

▲ The overall shape of Hi Mirror is like a giant whale shaking its head and tail. It is speculated that this is also the origin of the logo of Hi Mirror whale. In order to reduce the weight, the whole product is made of plastic parts, with the upper part highlighted and the lower part sanded. The upper part of the product obtained this time has no surface treatment, so it has a strong sense of plastic. I believe that doing baking paint will greatly improve the overall texture of the product.

▲ The head beam and the main body can be folded 90 degrees, with strong damping. The angle between the equipment and the eyes can be shaped by this damping.

▲ Soft protein cotton is set on the forehead of the head beam, and a locking button is set on the upper end to adjust the size of the head ring.

▲ The expansion range of the headband is much larger than that of the engineering version, and the workmanship is more meticulous. Before wearing, set the headband slightly smaller than your own headband, and fix the size through the lock key.

▲ Since Hi Mirror supports pupillary distance adjustment, the lens barrel can move left and right. Compared with the engineering version, the exposed part of the lens barrel is slightly thinner. In addition, the asymmetric design of the upper and lower protein cotton pads leaves a little room for heat dissipation at the lower end to reduce fogging. The actual experience has really improved.

▲ One button 3d function is set on the left edge. The so-called one button 3d is not 2d to 3d, but to convert left and right 3d film sources into 3d effects. The principle will be explained in detail in the subsequent evaluation.

▲ The right end is equipped with brightness adjustment and aux3.5mm interface. The brightness is not stepless, and it is divided into several light and dark levels. Thanks to the light-emitting principle of oled, under high brightness, the picture will not appear gray and the contrast will decrease. The aux3.5mm audio output is the audio output interface when connecting the hdmi device.

▲ In addition, the nose pad of Hi Mirror is designed to be detachable, and should have several sizes. Since the nose pad needs to bear a part of the force when wearing, it is made of soft rubber.

▲ At the bottom of the Hi Mirror is the pupil distance adjustment and diopter adjustment. The diopter supports 1000 degrees myopia, but although I am 500 to 600 degrees myopia, I cannot confirm beyond this range.

▲ Hi Mirror uses standard hdmi interface for input. Since two 0.7 inch 1080p oled screens are powered by hdmi, some devices with insufficient hdmi power supply cannot successfully light up Hi Mirror. However, Hi Mirror provides a USB to hdmi power supply line to solve this problem. The connection of other devices will be tested in detail in the subsequent evaluation.

▲ In addition to the head display part, Hijing is equipped with a standard android platform controller, which can also be understood as a high-performance android box with its own control panel and lithium battery. The four core Cortex-aA17, 2G DDR3 storage is sufficient for full HD video decoding and mainstream Android game operation, 2.4G/5G dual band wifi also ensures that you can enjoy multimedia viewing in the gigabit LAN. The system uses Android 5.1, and in conjunction with the in-depth customized UI developed by Hijing itself - WHALE. The UI interface is very gorgeous and friendly, which will simplify the operation and make it stupid, but it maintains the high scalability of the Android platform. These will be introduced in detail later.

▲ The buttons of the controller are made of aluminum alloy. The function icon is etched and sagged. Frequent operation will not cause discoloration and wear. The overall layout is very simple and easy to understand. Blind operation is not a problem after getting used to the distribution of buttons.

▲ The upper end of the controller is equipped with an aux3.5mm audio output interface, USB2, 0 interface, micro usb power interface, which can connect ordinary USB storage devices, or connect computers with data cables through micro usb for file management. In addition, USB2,0 supports emergency charging for mobile devices, and mobile chargers also support charging controllers through micro usb, with a high degree of freedom.

▲ The left side of the controller is equipped with a tf card slot, which can support up to 128gb, that is, more than three bd50 film sources. However, because Hikvision has no digital output and multi-channel audio tracks are useless, it is most reasonable to download 1080p dual channel film sources and dts film sources. Calculated as a 15g 1080p dts audio track film source, 8 films can be installed. If it is a 5g 720p video source, 24 films can be installed, So it's not difficult to chase a play and watch a movie to kill the following time.

▲ At the bottom is the mic and hdmi output ports. Take the hdmi cable and connect it to the TV in the hotel as a high-definition box.

▲ On the right side of the controller is the aluminum alloy power button and power status light. The working status is always on, and the remaining power of the controller can be seen intuitively without the system interface.

▲ Finally, the controller's white "butt" is printed with 3C certification and main functions, such as HDMI, 3D, Blu ray wifi、 Bluetooth, etc.

System:

▲ WHALE is an in-depth customized UI based on Android 5.1. The overall style is scientific and technological, a bit like Iron Man's augmented reality helmet. The main interface is composed of five shortcut icons with the same style as the UI. There are time display, power progress bar and wireless mode in the upper right corner.

▲ The five shortcut icons on the home page can be changed by selecting other installed native APPs through the menu key.

▲ Dropdown is the APP page. WHALE has few customized APPs. In addition to the self-developed local video player, it also integrates the iQIYI APP, application download, game download, file management and browser of the online content partner. In addition to the application center, WHALE supports the installation of APK files applicable to the Android platform through mobile storage devices.

The setting of WHALE is extremely refined and simplified, and the original android layout cannot be seen at all. The setting interface is divided into four sections, namely, network settings, Bluetooth settings, storage settings, and system settings.

▲ Because 2.4G/5G dual frequency wifi is used, WHALE can identify 5g wifi hotspots in the network environment.

▲ Similarly, the Hijin controller, which contains the Bluetooth module, can also connect to nearby Bluetooth devices, such as Bluetooth headsets and Bluetooth speakers, and use high-end Bluetooth speakers to watch movies. The sense of substitution is much stronger, such as the Q3D panoramic Bluetooth speaker in crowdfunding.

▲ Through the storage settings in the setting menu, you can visually see the device storage status, and jump to the APP through the file manager in the upper right corner for file management operations.

▲ Through system settings, the user can open the pupillary distance and diopter adjustment tutorial of Hi Mirror, set the standby time of the controller, and update and factory produce the system firmware.

▲ Pupil distance and diopter adjustment are corrected by two pictures. Pupil distance is the definition of L on the left side and R on the right side of the screen, and diopter is the definition of E on the screen edge, which is more accurate than blind self adjustment.

▼ Wearing part: weight is about 360g, pupil distance is 62-70mm, wearing stability is good

▲ The pupillary distance of Hi Mirror is about 62-70, which is the pupillary distance when looking from afar. It should be said that it is suitable for most of the pupillary range, while the diopter is not equipped, so it is impossible to identify whether the maximum 1000 degrees can be achieved through perception.

▲ The measured weight of Hi Mirror is about 360g, slightly higher than the advertised 300g. It may be that the mass production model has changed, 40g heavier than the t3w, and the wearing feeling should be comfortable and hmz series.

▲ Because it is different from the headband behind the hmz series, Hi Mirror adopts the three-point fixed stress principle, which is more hung on the head than tied on the head.

▲ It is easy to debug to the best state through the system side setup tutorial.

▼ Effect: Size: 4m viewing distance is about 150 inches, 20m viewing distance is about 750 inches, FOV is 51 degrees, and there is a little pillow distortion. There is a slight fog phenomenon at the beginning of startup, and the lens edge extinction process still needs to be improved.

▲ There is no reference for the display size of Hi Mirror, and the large screen is realized through the lens, so there is no visualized size parameter. According to the imperial position (4 meters) of the small visual listening room, 150 inches is almost sensory. According to the size calculation, the length and width of 150 inches is 3.32 meters * 1.87 meters.

▲ The horizontal projection length is 16.6 m and the vertical projection height is 9.35 m calculated by projecting 150 inches in 4 meters and 20 meters respectively.

▲ It is calculated that the diagonal dimension of 16.6 m * 9.35 m is 750 inches, that is, 19.05 m, and that of 20 m is 19.05 m, that is, 51 degrees.

▲ Although the official propaganda of the lens group distortion of Hi Mirror is less than 0.03%, it can still be seen that there is pillow distortion. The 0.7 inch OLED is more or less distorted after being magnified by six lens groups. Fortunately, the appearance of pillow distortion is somewhat similar to that of curved screen, so it will not affect the appearance. I hope there will be a solution in the future, such as using software to correct it.

The mass production version has adjusted the thickness of the lens barrel (the distance from the eyeball) and the fit of the facial protein cotton pad, so it has improved a lot of fogging. In addition, there is a little fogging at the beginning of wearing. However, because the lens is cold, it is still easy to liquefy water vapor, so it needs to wait about 10 minutes. After the lens barrel is thermally heated, the fogging phenomenon will not appear.

Hi Mirror uses a 1080p oled screen, and the crystal lattice can no longer be seen by the naked eye. The deepest impression of these two oled screens is the black position. Traditional LCD screens use backlight panels because of the light emitting principle LED or light tube, under high brightness, the contrast of the picture will be reduced, and the black position will be gray. The self illumination principle of the oled makes the black part of the film playing dark color very thorough, without noise distortion, and more details.

▲ Hi Mirror's 3D effect should be the most perfect in personal audio-visual equipment. Most of the traditional household 3D AV equipment use shutter technology, which inevitably leads to ghosting and brightness problems. However, Hi Mirror sees an oled separately with each eye, and each oled has its own 3D picture information, so the brightness is intact and there is no overlap. With the unique lighting principle of the oled, even if the brightness is turned to the highest, It will also not lose the contrast of the image. In addition, when viewing the built-in LG 3d test film, the screen output effect and image fineness are excellent. Although the left and right 3d film sources are used, there is no loss of image quality.

In addition, we tried Avatar's left-right 3d, Jurassic World's left-right 3d, and Galaxy Guard's left-right 3d. These 3d films are not like the god of death. 5. Domestic 3d films are full of screen display technology shots. For the depth of field performance of the environment in the film and the 3d creation of environmental details, it seems that people are immersed in it. If the fov reaches more than 90, it will make people unable to distinguish between reality and fantasy, Here, we can also see why VR is so popular, and we are looking forward to the future performance of Hijing team in the VR field.

▼ Application:

Wireless on-demand

▲ Aiqi is the content partner of Hijing, so the crowdfunding Hijing will give away Aiqi litchi members for one year. Of course, because it is an android platform, it is compatible with other online on-demand APPs, but using litchi tv and members can watch online movies at the first time and avoid annoying advertisements.

However, users can download 3d broadcast, which is developed for mobile phone vr, so there are a large number of online 3d movie sources.

Play locally

▲ Hi Mirror has a built-in local player. The UI is consistent with the system. In addition to supporting local disks, USB storage devices, TF cards, it also supports browsing LAN shared files. However, the local player is still perfect and cannot play the original ISO.

▲ Therefore, KODI, the former XBMC, is recommended. In addition to supporting nfs sharing for nas users, it can also support MKV, M2TS, ISO and other common high-definition film sources, and can decode next-generation audio tracks. There are numerous such courses on the Internet, so I will not repeat them.

game

▲ Hi Mirror has a built-in Grape Game Hall, which provides a wealth of mobile games for users to download.

▲ In addition, the first stage of the crowd funding of Hijing presented a game handle, but the evaluation machine did not provide it. However, the handles intended to support the Android platform are compatible. Hijing has a strong sense of substitution when playing racing games, but FPS is a little tired because the eyes are always in the center of the screen, and it is impossible to turn the head to see the edge of the screen like LCD TV.

▼ Format compatibility: compatible with all mainstream HD formats.

For the format compatibility test, we mainly select some common HD formats to play through KODI, such as Blu ray original ISO, HD MKV, MP4, MOV, etc., involving audio track ATMOS DTS-HD、TRUEHD。

ISO: BD20 50 Blu ray original disc plays smoothly.

Test piece:

[Saving Private Ryan] Saving Private.Ryan.1998.Blu-ray.JPN.DIY.UltraVer.1080p.AVC.DTSHDMA (44G)

[Ant Man] Ant-Man.2015.1080p.3D BluRay.AVC.DTS-HD.MA.7.1 (38G)

[Doomsday Collapse] San Andreas.2015.1080p.3D.BluRay.AVC.TrueHD.7.1.Atmos (34G)

[Jiupin Sesame Officer] Hail.the Judge.1994.BluRay.1080p.AVC-HDS (23G)

MKV： Original disc remux MKV plays smoothly

Test piece:

[Avatar] Avatar. 2009. BluRay HK.1080p.AVC.DTS-HD.MA5.1-CHDBits.m2ts (44G)

[Absolute altitude] Everest, 2015.1080 p BluRay.REMUX.AVC.DTS-HD.MA.TrueHD.7.1.Atmos.mkv (32G)

[Cloud Walker] The Walk.2015.1080p.BluRay.REMUX.AVC.DTS-HD.MA.5.1-RARBG.mkv (31G)

3D format: only left and right 3D is supported temporarily, and the 3D original disk is under iso test

Test piece:

ISO [Ant Man] Ant Man. 2015.1080p.3D BluRay.AVC.DTS-HD.MA.7.1 (38G)

ISO [Doomsday Collapse] San Andreas.2015.1080p.3D.BluRay.AVC.TrueHD.7.1.Atmos (34G)

Left and Right [Jurassic World] Jurassic World.2015.1080p.3D.BluRay.Half-SBS.x264.DTS-HD.MA.7.1.mkv (23G)

Left Right [Avatar] Avata.2009.3D BluRay.1080p.HSBS.DTS.2Audio.x264-CHD.3DSBS.mkv (20G)

According to the test, the principle of HIJING's one button 3d function is as follows:

▲ If a 1920 * 1080 picture information is cut in half, the left half is displayed in the left eye's oled, and the right half is displayed in the right eye's oled. In theory, as long as the software can process the two video information of the iso original disk into the left and right modes.

But after testing, The kodi 15.2 version has not yet realized the playback of the original disc 3d. Although the 3d menu can be called out, two picture information can not be recognized and processed into the left and right pictures for output. In addition, the xmbc provided by the sofa butler can realize the left and right pictures, but the left and right pictures are consistent. It seems that the next version of kodi should be updated to play the original disc 3d.

However, even if the 3D original disc iso can be viewed, the 3840 * 1080 picture is compressed into 1920 * 1080 and output through software. In fact, part of the resolution is lost, which is no different from the processed left and right 3D movies.

▼ Wireless transmission performance: 5G wifi plays BD50 original disk smoothly.

Through the 5G wifi connected to D-Link DIR-859, the same room plays more than 40G Blu ray discs, and no jam is found. It is worth noting that D-Link DIR-859 uses 11AC technology, and the LAN ports are all gigabit ports. Now some so-called 5G wifi in the market do not use 11AC technology, but still use 100M LAN ports, which will cause playback jam and buffer.

▼ Extended performance: compatible with common playback sources with HDMI output.

▲ Since the two OLEDs of HIJING are powered by HDMI, but the HDMI power supply voltage of some devices is not enough to drive HIJING, so HIJING must use a standard HDMI power supply adapter line.

▲ One end of the adapter cable is a standard HDMI female connector, which can be compatible with all standard HDMI male connectors.

▲ On the other end, the conversion to HDMI male and USB interface is actually to allocate the power supply line of HDMI to USB. In this way, the Hi Mirror can not be started directly through the HDMI interface, because the power supply array of the hdmi interface of this adapter line is useless, and must cooperate with USB power supply.

▲ When it is played with a compatible vten 10 hard disk, the color of the professional player is better and eye-catching. The early digital repair version has less grainy film source, and the dark transition is smoother without distortion.

▲ It also successfully connected to the PS3 and experienced Shenhai series and Zhanshen series. The refresh rate of Hi Mirror is good, and the game has no dizziness or eye swelling, but individuals are better adapted to playing games on LCD TVs.

▲ Because there is no high-end blue disc player at hand, and there is no function to output left and right 3D images, only 2d movies can be viewed, and 3D playback cannot be realized.

▲ After the test of the unique display connection with the desktop computer, the adapter cable is not required, but the laptop requires the adapter cable for power supply, which is also related to the power supply. It can be seen from the display settings that Hi Mirror supports a maximum refresh rate of 1080p, 60HZ, so there will be no delay and shadow dragging when playing big events and games, The 3D effect still needs to be realized in the form of left and right pictures. However, the Windows system can convert the original 3D disk and upper and lower 3D into left and right 3D. In addition, some 3D games that support left and right output can also be 3d.

In general, Hi Mirror and Sony HMZ are both headworn cinemas, but their positioning is in two directions. Sony is more targeted at professional 3D experience. Because Sony has its own video processing box, it supports native 3D original disks and 3D vision games, but at the expense of portability, even HMZ T3W can only be used for small-scale activities, while Hi Mirror has its own Android playback source, 5000mAh, 1000 degree diopter adjustment, supports outdoor and indoor use, and also supports connection with other hdmi devices. Although the first generation only supports left and right 3D, it can meet the 3D experience of most users, and the display effect of 1080p physical resolution is also superior to the HMZ series. Moreover, the termination of the HMZ project has become history, Hi Mirror is the only choice for professional headworn cinemas in the market at present. In addition, it supports the replacement of second-generation products for 999 yuan, so it is worth getting started.