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Detailed description of projector performance
Release time: 2018-11-09 Read: 647

LCD projector performance details - excerpt 1. LCD panel

The liquid crystal has an active liquid crystal and an inactive liquid crystal. Inactive liquid crystals reflect light and are generally used in notebook computers and film projectors. The active liquid crystal body is translucent, and is made into an LCD liquid crystal panel for use in a projector. The brightness, color, contrast, etc. of the light passing through the LCD can be controlled by the control system.

The size of the LCD panel determines the size of the projector. The smaller the LCD, the smaller the projector's optical system can be made, and the smaller the projector. To achieve high resolution on a small LCD and maintain high brightness, the technical difficulty is conceivable. At present, projectors for conference rooms are mostly 1.32-inch LCD panels, and portable projectors are 0.9-inch LCD panels. In 2000, there will be a 0.7-inch LCD panel with physical resolutions of SVGA and XGA.

When evaluating a liquid crystal projector, in addition to the size of the LCD panel, it is also necessary to see the number of LCD panels used by the projector. There are projectors with a single LCD panel and three LCD panels on the market. When there are many liquid crystal panels, the number of pixels is large. A pixel is the basic unit that makes up an image. The larger the number of pixels, the finer the image.

Number of pixels = physical resolution x number of liquid crystal panels

For example: SVGA model number of pixels = (800x600) x3

2. Output resolution

Refers to the resolution of the image projected by the projector. Or physical resolution, actual resolution, that is, the resolution of the LCD panel. The liquid crystal body is divided by a grid on the LCD panel, and one liquid crystal is a pixel point. Then, when the output resolution is 800 x 600, that is, 800 pixels are divided in the horizontal direction of the LCD panel, and 600 pixels are vertically divided.

The higher the physical resolution, the larger the range of the resolution that can be received by the 12000 lumen projector, the wider the range of adaptation of the projector. Physical resolution is often used to evaluate the value of liquid crystal projectors.

3. Maximum input resolution

It means that the projector can receive a resolution larger than the physical resolution, and the signal is sent out by a compression algorithm.

1) Early projectors used a line drawing algorithm, namely: linear compression technology. This algorithm has a drop problem.

2) Various manufacturers have introduced new algorithms for compressing signals.

4. Horizontal scan line

Also called video scan line. Mainly used to evaluate the quality of video signals. The default refers to the NTSC system. Generally, the VCD is 220 lines, the LD is 450 lines, and the DVD is 500 lines. The maximum supported line number of the projector is 700 lines.

5. The international standard unit of brightness is ANSI lumens. The measurement environment is as follows:

1) Distance between projector and screen: 2.4 meters

2) The curtain is 60 inches

3) Measure the brightness of 9 points of the projected picture with a light meter

4) Find the average of the brightness of 9 points, which is ANSI lumens.

The projectors of various brands have different brightness depending on the measurement environment, although the ANSI lumens are the same.

6. Color

Today, almost all projectors support 24-bit true color. So to evaluate the color reproduction of the projector, not only look at the color, but also look at the contrast.

7. Contrast

It is the ratio of black to white, that is, the gradient from black to white. The larger the ratio, the more gradients from black to white, and the richer the color.

8. Screen size

It refers to the size of the screen that is thrown. To deliver the required size, place the projector at a distance from the screen.

The relationship between the screen size and the projection distance varies depending on each model.

9. Projection distance

Refers to the distance between the projector lens and the curtain.

10. Uniformity

It is the ratio of the intermediate brightness of the projected screen to the surrounding brightness. The middle is generally defined as 100%.

11. Lens

F is the transmittance of the lens. The smaller the F, the better the light transmission of the lens.

It is the magnification ratio of the lens. 77/55=1.4, that is to say, in a fixed position, the picture can be enlarged by 1.4 times.

12. Ceiling function

Project the projector upside down on the roof. As shown below:

13. Rear projection function

Place the projector behind the back screen for projection.

14. Keystone correction

Some projectors offer an electronic keystone correction that makes it easy to correct trapezoidal distortions caused by overhead or ceiling projection.

15. Horizontal scanning frequency

Also called line frequency. The projector's horizontal scanning frequency has a range. If the horizontal scanning frequency of the input signal from the computer is outside this range, the projector will not be able to be placed (NO SIGNAL).

16. Vertical scanning frequency is also called 桢 frequency. If the vertical scan frequency of the input signal from the computer is outside this range, the projector will not be able to be placed (NO SIGNAL). Within the range, when the vertical scanning frequency of the computer is set to a high value, the projection effect is good.

17. Computer input interface refers to the input interface of the computer display signal. The conference room model generally has two interfaces, which can connect two computers at the same time. The portable model generally only has one interface.

18. Computer output interface

Refers to the output interface of the computer display signal. The display can be connected via this interface. If the projector does not have this interface, you can use a VGA splitter to connect the display.

19. Video signal

Supports three formats for video signals: NTSC, PAL, SECAM

20. Standard video input

It has a standard video input interface (RCA). The standard video signal is encoded at the time of output, the signal is compressed and output, and decoded at the time of reception. This will lose some signal.

21. S video input

With S video input interface (S Video). Since the S video signal does not need to be encoded and decoded, there is no signal loss, so the S video signal is better than the standard video signal.

22. Audio input and output has an audio input and output interface. Audio signals from computers, video recorders, etc. can be input and played through the built-in speakers. It can also connect the power amplifier and external speakers through the audio output interface.

23. Power supply

The smaller the power supply, the less heat the machine produces, so that the machine will continue to project for a long time. For safety, the projector is usually equipped with an overheat protection device.

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