The projector body ViewSonic Pro7827HD are mainly made of black plastic with a matte surface, but there is a mirror-smooth sections, and the top panel has a texture unpolished metal.
Behind bars on the left side near the front is relatively large speaker with a diffuser round shape. The top panel of the lens there is a niche, which opens access to the ribbed zoom ring and focus on niche – vertical lens shift knob, and the right and closer to the rear panel control buttons and status indicators.
In addition, the top panel cover is present covering the compartment with an HDMI connector (it supports connection via MHL) and Micro-USB plug on the short cord.
It is assumed that in this compartment, the user can install the optional Wi-Fi-adapter, which if necessary can be powered from the Micro-USB, thus expanding the capabilities of the projector ViewSonic Pro7827HD by wireless functions. On the rear panel – a niche with the interface connectors.
Also on the rear panel you can find the power connector and a connector for a Kensington lock. After completing all the connections on the rear panel can be mounted cable cover, thereby giving a more accurate view of the projector ViewSonic Pro7827HD.
IR receiver is only one – the front.
Front leg unscrewed from the body (approximately 37 mm, threaded stand made of plastic) that allows you to lift the front of the projector. Rear projection based on two legs with rubber soles. At the bottom of the projector 5 are embedded metal threaded sleeves designed to be mounted on a ceiling bracket or tripod mount. At the junction of the bottom and the right side has a bracket made of plastic, for which the projector can be attached to something massive to not stolen.
ViewSonic Pro7827HD comes in a small colorfully decorated box with a plastic handle on top.
The remote is not very big in the hand is convenient. the remote casing is made of black plastic with a matte surface. Buttons medium-sized (of rubber-like material), they are located closely, though frequently used buttons are larger and placed more freely. Symbols buttons too small, but the contrast. The integrated laser pointer remote control, although the button and including, between commonly used, so sometimes accidentally pressed.
One must be careful not to light someone in the laser eye, just working with the menu. Green button with an asterisk can be assigned to one of the options from the list in the Setup menu.
Remote control can be assigned to one of eight codes in this remote will control the projector ViewSonic Pro7827HD must match the code set in the menu on the projector. It feeds on the panel from two AAA batteries. remote command codes are listed in the manual that can be useful for smart home control systems.
The projector ViewSonic Pro7827HD is equipped with standard connectors. Inputs relatively large – a set of analog interfaces and three digital HDMI, one of which is hidden in a niche for the optional Wi-Fi-adapter. Two HDMI inputs supports the connection of mobile devices on the MHL. Co. VGA input can be connected to sources of the component and the color difference signal, but it will need to use an adapter for three RCA connectors. There are automatic detection of an input signal (can be switched off). The projector has a built in speaker, so there are analog audio inputs, and HDMI inputs are capable of receiving audio in digital form. To one of the two analog audio inputs, you can connect a microphone.
Need to use the Out output (group Audio) To connect external speakers or headphones, if this connector is enabled, the built-in speaker will be muted. By the Monitor outconnector to attach an external display device – this connector is passed that is supplied to the VGA input.This function can work even when the projector is in standby mode. RS-232 interface for remote control of the projector, the relevant specifications are given in the User’s Guide. Connecting via USB (via Mini-USB connector), the projector is defined as a HID-device that allows connecting on a VGA projector to the remote computer to transmit control signals – to move the mouse cursor to click on its button and pressing issue on the page turning buttons.
USB Type A connector is used to feed external devices (stated that the issue of up to 2 A), for example, it can be used for charging active shutter glasses or wireless receivers / microcomputers connected to the HDMI. Apparently, stereoscopic shutter glasses to synchronize with the output frames using DLP-Link (with additional pulse synchronization of the image itself) technology. Note that the appropriate shutter glasses were not provided to us, so the stereoscopic mode, we have not tested. It stated that supports stereoscopic signals with alternating frames (up to 120 Hz at 1280 by 720 (800) pixels), with horizontal or vertical stereo pair and packed footage, and the projector can be connected directly to the player Blu-ray 3D.
Font menu with the settings and large enough to read, but writing is not very contrasting. Navigation is more or less comfortable. Remembers the last page, that users access. If you adjust picture parameters menu is on the screen, which is somewhat difficult to assess the changes made to the image. The menu may be in the five areas of the screen, there is a choice of automatic timeout exit.
Translated into Russian adequate. Attached to the projector printed Quick Start Guide mostly in pictures, and the Russian version of the full guide can be found on the accompanying CD-ROM or on the manufacturer’s website.
Focus the image on the screen and adjust the focal length by turning the ridged ring on the lens. Zoom ring has a protruding lever. The projection is directed upwards so that the bottom edge of the projection area is significantly above the lens axis. Reversible projection can move slightly up and down (stated that the shift range is 20% of the projection height). Available function manual correction of vertical and horizontal keystone distortion, as well as a handy feature geometry correction in the corners. There are several modes of transformation – is sufficient to align the format of the projection area and common video formats.
There trimming the edges with zoom and digital zoom with the ability to scroll the magnified area. projection type selected in the menu (front / rear, normal / ceiling mount). Setting projection facilitates embedded test pattern. Projector to medium, so it can be placed at the front row of the audience or him.
The projector ViewSonic Pro7827HD is equipped with several preset profiles. Settings governing luminance and color balance, relatively abundant, they do not understand the very simple, many of the values of the usual values in conventional units, some settings partly overlap in terms of the effect produced.
Settings are stored for each type of connection.
The projector ViewSonic Pro7827HD can independently turn on when power is applied, according to the team for HDMI (supports CEC), or when a signal is detected on the VGA-input. Is a function of automatic shut-off (at first simply reduced power consumption) of the projector after a predetermined no-signal interval or after a predetermined time. On the temporary shutdown of the projection can be set a time limit. To use as a screen saver, you can capture the displayed image.
There is a presentation timer function with direct or countdown.The projector ViewSonic Pro7827HD can display text subtitles transmitted with certain types of video signals. To prevent unauthorized use of the projector is password protection and lock buttons on the projector cabinet. However, all of these features we have not tested, just to list, as indicated in the manual of the projector.
Measurement of light output, contrast and brightness uniformity carried out by the ANSI technique described in detail here . The measurement results for ViewSonic Pro7827HD projector (unspecified settings have the values that maximize the brightness and contrast):
Maximum light output just above the passport values. The uniformity of the white-light field-acceptable. Contrast to the DLP-projector is not very high. We also measured the contrast by measuring the brightness in the center of the screen to black and white field, t. n. contrast ratio full on / full off.
The contrast without color correction (that is, in its brightest mode) is relatively high. Improved color reproduction in movie mode, naturally reduces the contrast and light output, that is, the user has a choice – either to achieve maximum likelihood flowers and little to lose in brightness and contrast, color, or leave as is, while maintaining the maximum brightness and contrast. With the included dynamic control of brightness contrast between light and dark is increased, but the practical benefits of this bit.
To assess changes in the gray scale brightness we measured the brightness of 256 gray shades (0, 0, 0 and 255, 255, 255) for the profile and ViewMatch Gamma = 3. The chart below shows the increase (not an absolute value!) Between adjacent luminance halftone :
The graph shows that not every subsequent hue significantly brighter than the previous one. The first two coming to the black color is not distinguishable in brightness from black:
Approximation obtained gamma curve given index value of 2.18, which is almost equal to the standard value of 2.2, while the actual gamma curve slightly deviates from the power dependence:
The projector ViewSonic Pro7827HD is equipped with a color filter with six segments: red, green and blue, repeated twice in this order. Through the use of the gaps between the segments increases the brightness of the white box at the Brilliant Color mode is activated. Of course, the increase in brightness with respect to white, for example, pure red, green, and blue color balance deteriorates brightness – pure color against white areas look unnaturally dull. When you turn off the Brilliant Color mode balance is leveled. However, the illumination field falls white and black luminance of the field practically does not change, which leads to some reduction in contrast.
According to a graph of the brightness of the time, the frequency of alternation of the color filter segments is 240 Hz vertical scan of 60 Hz, ie. E. Filter has a 4x speed. The frequency is relatively high, so the effect of the “rainbow” visible is not very strong. As in many DLP-projectors, dynamic color mixing (dithering) is used for the formation of dark shades.
Warning: The values of sound pressure level of the refrigeration system prepared by our method and they can not be directly compared to published data projector.
The noise level and power consumption, as already mentioned, dependent on the current mode.
In standby mode, the power save features power consumption of 0.4 watts.
For watching movies at home projector bit noisy, well, that the noise from the cooling system is smooth and does not irritate.
Built-in speaker of the projector louder. Distortion and spurious resonances at maximum volume are large, but it is lower, as the sound quality is improved considerably. The overall quality is above average. When you connect headphones, the internal speakers are disabled. The sound quality in the low headphones.
When you connect a VGA-supported resolution of 1920 by 1080 pixels at 60 Hz frame rate. Image clear, colored lines a single pixel displays without loss of color definition. Shades of gray on the scale vary from 0 to 255, that is, there is no blockage in the shadows or in highlights. Variation of color impurities on the small gray scale. Automatic adjustment for VGA-signal parameters is carried out quickly and efficiently.
When connected to a DVI-output of the computer video card (using an HDMI cable, adapter to DVI) modes are supported up to 1920 by 1080 pixels at 60 Hz inclusive framerate. Geometry is excellent – inside the deflection along the boundaries of the projection is not more than 3-4 mm 1.5-2 m width. Clarity is high, as well as connecting with the VGA-colored lines a single pixel displays without loss of color definition.Chromatic aberrations are minor, even in the corners of the width of the dim colored rims in contrast objects is minimal. The uniformity of the focus is very good – only to the corners of the picture a little lost in the field.
HDMI-connection is tested using a Blu-ray-player Sony BDP-S300. Supports 480i mode, 480p, 576i, 576p, 720p, 1080i and 1080p @ 24/50 / 60HZ. The picture clearly. In 1080p mode with 24 frames / sec frames are displayed with an aspect ratio length 2: 3. The shadows have a blockage on a pair of shades, but in light of the subtle gradations of shades vary up to white. The brightness and color clarity is always very high.
In the case of interlaced signals only for constant frame parts is performed bonding of the fields, changing field often appear in the fields (frames restored NTSC only with 3-2 fields alternating at 24 frames / sec at baseline). However, for a conventional interlaced video resolution is performed some smoothing of diagonal borders of moving objects. scaling quality to permit the matrix relatively good.
We determined the total output of the delay switch pages framebuffer before the output image on the screen.In this case, the resulting value does not include an unknown fixed amount of delay from the request to switch pages framebuffer to run ADC with an external photocell installed in the center of the monitor screen, as well as some constant / variable delay due to the fact that Windows is not a real-time system with normalized delays and the peculiarities of the graphics card, its drivers and Microsoft DirectX. As a result, the image output delay was approximately 50 ms for VGA- and HDMI-connection. Delay border, at work, it is almost not felt, but in the case of very dynamic games may have a negative impact on productivity.
To assess the quality of color reproduction using a spectrophotometer i1Pro 2 and set Argyll CMS software (1.5.0) .
However, differences between sRGB small, so the colors are close to saturation, natural. Here are the spectra obtained for the brightest mode – the mode for the Max. brightness with a maximum value of Brilliant Color (range for the white box (white line) superimposed on the spectra of red, green and blue fields (lines of the respective colors)):
It is seen that the brightness of the white color is slightly higher brightness green and red colors, so in this mode, the color on the background of the white areas of the picture look a little dull. In ViewMatch brightness green mode (as seen visually as a blue-green colors) color selectively increased relative to white in this region of the spectrum, it looks bad:
In the balanced mode (. The movie mode and Brilliant Color = off) the brightness of the colors aligned with the white brightness:
The graphs below show the color temperature in different parts of the gray scale and the deviation from the blackbody spectrum (parameter ΔE) for the above three modes:
Close to the black band can be ignored, because it colors are not as important as the color characteristics of high measuring accuracy. It is seen that in the color reproduction mode Max. brightness is clearly not a priority, as the color temperature is sufficiently close to 6500 K, but ΔE much higher threshold of 10 units, of course, due to an excess of green components such as the brightest. In ViewMatch ΔE mode is much lower, but the color temperature of a tall and have a problem with the balance of the brightness of colors (see. Above). The optimal mode of film, because it the color temperature is close to the standard 6500 K, .DELTA.E of about 10, that for consumer devices is considered acceptable, and the color temperature and .DELTA.E vary little throughout having a value of the gray scale, which favorably affects the subjective perception of color balance. If desired, the color balance can be even a little better settings.
ViewSonic Pro7827HD equipped with the right color filter with alternating RGBRGB segments. Such a filter in the single-chip DLP-projector provides a balanced ratio of the brightness of colors and white while maintaining high contrast and brightness. As a result, the positioning device as a projector for home theater looks justified, and even the appearance – black hull – corresponds to this category. If necessary, it is permissible to use the projector for presentations, which favors a number of specific features and, of course, it can be used for home viewing entertainment content and games on the big screen. At the same time due to the relatively high brightness there is no need to complete blackout. Projector functionality is expanded by the acquisition of active shutter glasses and a Wi-Fi-adapter. The first accessory enables you to watch on the projector stereoscopic image, including when connected directly to the player Blu-ray 3D, and the second – to pass on the image projector ViewSonic Pro7827HD with a PC and mobile devices over the air, without wires.