When it comes to virtual reality, we should be familiar with it. In fact, in the 1980s and 1990s, there was also a storm of virtual reality. The game platform manufacturers Sega and Nintendo made hardware, and even Apple released Quicktime VR, which can experience panoramic photos. However, at this stage, the attempts of various technology companies can only use the extremely low computer level and backward hardware at that time to combine the dream products that surpass the times, which is fleeting.

At present, HTC Vive and Oculus Rift are the best VR devices on the market. HTC, frustrated in the mobile phone market, and Oculus, the leader of virtual reality devices, which has been working hard in the VR field for many years, have almost reached the height of the current technological level in terms of parameter configuration, performance, and functions. However, its high price and experience are limited by the venue, which makes many VR enthusiasts unreachable. So many manufacturers have launched VR all-in-one machine. Compared with mainframe VR, VR all-in-one machine has a lower price and better portability. Compared with the rough combination of box+mobile phone, it has a better sense of immersion and high-quality pictures. Dahua Headworn TV is such a VR all-in-one product.

Appearance design

When I just received the big picture head mounted TV, the volume of the product packaging exceeded my expectations. On the back of the package, we can see the basic configuration information of this product: Sharp 4K display, 76 ° view, quad core processor.

Dahua head mounted TV is equipped with a head mounted display, a remote control, a data cable and a spectacle belt when it leaves the factory. It is worth mentioning that the mainframe and battery of Dahua Head mounted TV are integrated in the remote control, so the whole handle will be heavy.

The fuselage is made of silver spray paint plastic. Compared with other VR products on the market, the appearance design has nothing to show for it, giving a feeling of cheapness. Because it is made of plastic, and the host and battery are both built in the remote control, the body weight of the Dahua head mounted TV is only 358g, which means it has no sense of weight.

The eyewear belt of Dahua's head mounted TV is detachable. Three buttons are designed on the upper part of the body and on the left and right respectively. The eyewear belt is made of conventional nylon material and velcro design. The length can be adjusted according to the size of the user's head, but it is a bit low-grade. There is no soft material such as sponge.

There is an interesting design on the left and right parts of the fuselage. The concave sliding slots are designed on the left and right sides respectively, but when I tried to slide, there was no response to any function. I guess it was originally designed to adjust the volume or brightness, but it was cancelled for some reason.

A pupil distance adjustment roller is designed on the top of the body of Dahua Headworn TV. In addition, the body has no buttons that can be adjusted, including the focal length.

On the inside of Dahua's head mounted TV, an integrated skin friendly protein mask is used. On the one hand, the soft sponge ensures the user's comfort, and on the other hand, the device fits the face to prevent light leakage.

It is officially announced that the lens of Dahua Head mounted TV is aspherical lens, instead of concentric Fresnel lens used by high-end VR equipment at present, and the edge image will be deformed and blurred when displaying the image. Since the focus of Dahua TV can not be adjusted, myopic users must wear glasses or purchase official myopic lenses when using it.

At the center of the two lenses on the inside of the Dahua Head worn TV is a sensor that can sense whether the user is wearing the device. When the device is turned on, the device will detect and identify whether the user is wearing the device according to the light and distance. If it detects that the user is using the device, the screen will wake up. If it detects that the user is not wearing the device, the screen will automatically enter a sleep state to save power.

An HDMI cable is connected to the right side of the machine body, one end of which is fixed on the machine body, and the plug of the other section can be directly connected to the remote control host. The 3.5mm headphone connector is also integrated into this cable.

The control handle of Dahua head mounted TV is connected with the display terminal by HDMI cable. The control handle of Dahua head mounted TV is equipped with a quad core ARM Cortex-A7 processor, 2G memory and 16GB flash memory, supports Bluetooth 4.0 and WIFI, and also has a 5000mAh polymer lithium battery, so the control handle is relatively heavy and the heat is concentrated on the handle. The interface of control handle is very rich, with HDMI interface Type-C interface USB2.0 interface and TF card slot, so it is externally connected with various USB devices, with excellent expansion performance.

system

The HiOS video entertainment system is built into the Dahua HDTV. Dahua creatively performs split screen display processing at the bottom of the system. The software installed by users can be used without special customization. Since HiOS is customized based on Android system, it can be compatible with most Android and TV software, greatly enriching the playability of Dahua HDTV.

In terms of content, the HiOS of Dahua Head mounted TV has a very rich film and television resources. Dahua should have cooperated with several video websites to obtain the film and television resources with exclusive copyright, including the recently hit TV series. Most of the films just shown in cinemas can be found.

In addition to ordinary 2D film and television resources, Dahua Headworn TV also has a large number of 3D film and television resources, including many classic Hollywood blockbusters, such as the Pacific Rim and other 3D resources.

As a VR device, Dahua Headworn TV certainly needs the support of VR resources. However, the VR resources in the HiOS of Dahua Headworn TV are mainly small videos and panoramic photos, which can only provide VR enthusiasts with a taste.

The bottom layer of HiOS system of Dahua Head mounted TV is Android system, so it supports many Android or TV versions of small games, which are not related to VR, but just ordinary games.

Practical experience

Picture field of view. Dahua Head mounted TV has only 76 ° field of vision, and VR devices generally need to achieve 100 ° field of vision to achieve VR immersive experience. Obviously, the vision of Dahua with a TV on his head is not enough, but because Dahua is positioned as a TV, watching 2D video is far enough, and it feels like being in a cinema. When watching 3D video, the 3D effect of the picture is very obvious, but the definition of the picture drops slightly, which has a big gap with the cinema. It is a pity that the picture displayed on the big picture head mounted TV has distortion in the corners, which does not reach the official declaration of no distortion.

Delay. When we use VR devices, when the head starts to turn, the screen should immediately display the scene that should appear. If the screen has to be delayed for a while to catch up, users will feel dizzy. According to relevant research data, if users want to have no obvious sense of vertigo, the delay of human movement and VR device display must be controlled within 20 milliseconds. This puts forward higher requirements for the refresh rate of gyroscope, image rendering and display screen in VR devices. Through practical experience, the delay time of Dahua's head mounted TV is far more than 20 milliseconds. Da Hua's head mounted TV is aimed at the TV. We watch the video at a standstill, so this delay can be ignored. However, if we experience small VR video, we will feel slightly dizzy after using it for a long time.

Screen. The big picture head mounted TV screen uses Sharp 4K retina screen, which has excellent display effect, bright colors, high dynamic contrast, and can bring excellent viewing experience. However, as a VR device, the LCD screen is unqualified for the delay indicator. OLED has the characteristics of low delay and low afterglow, so OLED screen is the recognized development direction in the VR industry.

Write at the end

In general, the viewing experience of Dahua with a TV on his head is excellent, like watching a huge screen in a cinema. Dahua Headworn TV, equipped with Sharp 4K screen and rich movie resources, is an excellent entertainment artifact for video lovers. However, as a VR device, there are obviously many shortcomings. If it is positioned as a TV, but cannot share the fun of watching movies with others, the TV in our real life has gone beyond the function of the TV itself and become an indispensable decoration in the home. Obviously, the big picture head mounted TV does not have this attribute.   

During the experience, I have also been thinking about the future of virtual reality. In recent years, VR equipment manufacturers have sprung up like mushrooms. At present, Oculus, HTC and SONY are the international manufacturers that are deeply involved in the VR field, and they have all launched consumer products and started to layout in terms of content. Last year, Google released the VR mobile platform Daydream, which set standards for mobile VR. It seems that the future of virtual reality has come. We are destined to embrace virtual reality. In this process, we are limited by the level of technology and cannot achieve the best experience, which also requires us to face its imperfections.

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