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Comparison Xiaomi MiJia Laser Projection TV vs LG HF85JS

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Xiaomi MiJia Laser Projection TV
LG HF85JS
Xiaomi MiJia Laser Projection TVLG HF85JS
from $2,199.99 
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Main
Developed smart functionality. High peak brightness. Ultra short throw optics. Four speakers. Voice control. Extensive wireless connectivity.
Main functionhomehome
Operating system
Smart TV (proprietary system) /MIUI TV/
Smart TV (proprietary system) /webOS 3.0/
Lamp and image
Lamp typeLaser-LEDLaser-LED
Service life25000 h20000 h
Brightness5000 lm1500 lm
Static contrast3 000:1
Dynamic contrast150 000:1
Projection system
TechnologyDLPDLP
Size0.47"
Real resolution1920x1080 px1920x1080 px
Image format support16:9, 4:316:9, 4:3
HDR support
Projecting
Rear projection
Throw distance, min0.05 m0.1 m
Throw distance, max0.5 m0.2 m
Image size42 – 150 "90 – 120 "
Throw ratio0.23:10.19:1
Zoom and focusmanualmanual
Auto keystone correction
Lens shift
Keystone correction (vert), ±35 °
Keystone correction (horizontal), ±30 °
Features
Features
DLNA support
 
3D support
 
voice control
voice assistant
DLNA support
MHL support
 
multimedia (air mouse remote)
voice control
 
Bluetoothv 4.0v 3.0
Wi-FiWi-Fi 5 (802.11ac)Wi-Fi 4 (802.11n)
AirPlay+
Chromecast
Miracast
Hardware
CPUAmlogic T962X
RAM2000 MB
Built-in memory16 GB
USB 2.012
USB 3.2 gen1 (3.0)1
Number of speakers22
Subwoofer
 /2/
Sound power30 W6 W
Video connectors
composite
 
HDMI inputs32
HDMI versionv 2.0
Audio connectors
microphone input
3.5 mm output (mini-Jack)
RCA (audio)
optical
 
 
 
 
Service connectors
LAN (RJ-45)
LAN (RJ-45)
General
Noise level (nominal)32 dB
30 dB /26 dB in economy mode/
Noise level (energy-saving / quiet)26 dB
Power sourcemainsmains
Power consumption250 W140 W
Size (HxWxD)88x410x291 mm189x118x353 mm
Weight7 kg3 kg
Color
Added to E-Catalogjanuary 2019may 2018

Service life

Minimum projector lamp life as stated by the manufacturer. Specified by the total time of continuous operation. Note that if the projector was operated without violations, then upon reaching this time, the lamp will not necessarily fail — on the contrary, it can work for quite a long time. However, when evaluating durability, it is best to focus on the claimed service life.

Brightness

The brightness of the image produced by the projector at maximum backlight brightness. Usually, the average brightness of the screen, derived from a special formula, is indicated. The higher it is, the less the image depends on ambient light: a bright projector can provide a clearly visible image even in daylight, but a dim one will require dimming. On the other hand, increasing brightness reduces contrast and accuracy of colour reproduction.

Accordingly, when choosing this parameter, you need to consider the conditions in which you plan to use the projector. So, for office or school/university use, a brightness of at least 3000 lm is desirable — this allows you to get normal visibility without obscuring the room. In turn, among the top models a very low brightness can be found, because. such projectors are usually installed in rooms specially designed for them with good darkness level. And in ultra-compact devices it is impossible to achieve high brightness for technical reasons.

Detailed recommendations on the optimal brightness for certain conditions can be found in special sources. Here we note that anyway, it is worth choosing according to this indicator with some margin. As mentioned above, as brightness increases, contrast and colour quality decrease, and you may need to use the projector at a reduced brightness to achieve the desired picture quality.

Static contrast

The static contrast of the image provided by the projector.

Static contrast refers to the maximum difference between the brightest white light and the darkest black that a projector can provide within a single frame. Unlike dynamic contrast (see below), this parameter describes not conditional, but quite real capabilities of the device, achievable without the use of any additional tricks like auto-brightness. And since the quality of colour reproduction and detailing depend on contrast, the higher this indicator, the lower the likelihood that details will be indistinguishable in bright or dark areas.

Dynamic contrast

The dynamic image contrast provided by the projector.

Dynamic contrast ratio is the ratio between the brightest white and darkest black colour that a projector can produce. Recall that the quality of colour reproduction and detailing depend on contrast, the higher this indicator, the lower the likelihood that details will be indistinguishable in bright or dark areas. However, dynamic contrast is a rather specific parameter. The fact is that when it is calculated, the brightest white at the maximum brightness settings and the darkest black at the minimum are taken into account. As a result, the figures in this column can be very impressive, but it is impossible to achieve such a contrast within one frame.

By introducing this parameter, the manufacturers went to a certain trick. However, this is not to say that dynamic contrast has nothing to do with image quality at all. Projectors can use automatic brightness control, in which the overall brightness, depending on the "picture" on the screen, can increase or decrease. This format of work is based on the fact that the human eye does not need too bright areas on a general dark background and very dark areas on a bright one, the image is normally perceived even without it. The maximum brightness difference achievable in this mode of operation is exactly what described by dynamic contrast.

Size

The size of the panel/chip affects the depth and final quality of the image. The larger the panel/chip, the more light it is able to process, which means the picture will be clearer and more structured. The average projector has a sensor of 0.5-0.7″, advanced projectors use sensors of 1.2-1.5″ and more.

HDR support

The projector supports HDR technology — high dynamic range.

This technology allows to expand the range of brightness displayed within a single frame — in other words, to display both very bright and very dark colours on the screen at the same time. Due to this, colour reproduction is noticeably improved; in addition, in very bright or very dark areas of the frame, small details remain visible that would not be visible in a normal image. At the same time, it is worth noting that all the benefits of HDR become noticeable only on a high-end screen with maximum dimming. In addition, this function significantly affects the cost of the projector, and the content must initially be recorded in HDR — and using exactly the technology that the projector supports (this point can be clarified in the instructions). Because of this HDR support is found predominantly among high-end home theater models (see "Main purpose").

Rear projection

The ability of the projector to operate in the rear projection mode (“mirroring” the image).

There are two main types of rear projection. Most often, horizontal mirroring is found in projectors — it is used when installing the device behind a translucent screen. Vertical inversion, in turn, is used in projectors with fixed keystone correction — due to their design, when mounted under the ceiling, such devices must be turned upside down, which requires the corresponding correction of the displayed image.

Throw distance, min

The closest distance to the screen that the projector can be used on. Typically, this is the minimum distance at which the image from the projector remains in focus.

This parameter is especially important if the device is to be placed at a small distance from the screen (for example, in a cramped room). Some modern projectors are able to work normally at a distance of 10 – 20 cm. Also note that the throw distances are determined primarily by the lens, and if the initial range of these distances does not suit you, perhaps the situation can be solved by replacing the optics.

Throw distance, max

The farthest distance from the screen that the projector can be used on. This is the maximum distance at which the image remains in focus and maintains acceptable brightness — at least enough for viewing in a darkened room on a high-quality screen.

It is necessary to choose according to this parameter taking into account the expected operating conditions and the distances to be dealt with. At the same time, it's ok to have a certain margin for the maximum distance — since, as already mentioned, it is usually indicated for an perfect screen and a darkened room, and such conditions are not always available. Also note that although the throw distances depend on the lens, not every projector with an interchangeable lens allows the installation of more "long-range" optics than the standard one — the device may simply not have enough brightness for an increased distance.
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