Sony Multiscan CPD-G500 21" Monitor - Page 3

More Features
In addition, there is the GeoLock Plus™ circuitry which automatically senses and compensates for image or colour distortion caused by electromagnetic fields, a common problem at the corners of large screen displays.

The monitor also employs Beam Landing Correction™ technology that allows the user to adjust the exact placement of all three electron beams (red, green and blue) for enhanced colour purity and uniformity across the entire screen.

The display also offers users a unique feature called the DisplayMouse™ control. This soft-touch front panel control allows for fast and easy on-screen navigation, quick image set-up, image customization and display manipulation. 

The new DisplayMouse Control menu

Elliptical Correction System
How a Cathode Ray Tube (CRT) monitor works is determined by the electron beams generated at the very back of the cathode. We have three beams (Red, Blue and Green) generated by the electron gun. The beams are then focused through a series of lenses and control grids. The electron beams trace the phosphor layer painted on the inside of the CRT and change their shapes at the corner and edges. This elliptical shape doesn't "fit" properly into the confines of the aperture grill pitch and hence some of the beams' energy is wasted. This loosely translates into why the display from your conventional monitors usually appear 'sucky' at the corners.

Top: Your conventional electron gun
Bottom: Sony's electron gun with Elliptical Correction System

How the Sony's Elliptical Correction System™ works is that the system actually improves focus by refining the dimensions of the electron beam spot using grids. What you get is a more consistent display, especially at the corners of the display.

Without Elliptical Correction System. Corners are elongated.

With Elliptical Correction System. Grid size is consistent.

The Elliptical Correction System™ incorporates an additional astigmatic lens which helps to compensate for beam spread. As a result, the horizontal vs vertical measurements result in a 35% improvement, giving you a more uniform and consistent image!

So, What's this Active Signal Correction?
The Active Signal Correction™ (or ASC for short) allows the monitor to automatically resize and center the video image based on timing signals. Don't you just hate it when you change resolution, the video image shifts away from the center and you have to manually centre it again?

The Sony's Active Signal Correction™ solves this by recognizing the various signal attributes such as signal back porch, raster, as well as the entire video signal. By considering all the video parameters, the image can be more accurately sized.

Without Active Signal Correction

With Active Signal Correction

What Are Those Gray Lines Running Across The Monitor?
Trinitron monitor users should be aware about the two gray lines which run horizontally across the monitor. What the heck are those? Well, these two gray lines are actually caused by the shadow of the damper wire used to stabilize the aperture grill. According to the monitor technical specifications, there are currently two display technologies used to isolate pixels. Together with one of these technologies, pixels form the image to be displayed on the monitor.

Shadow mask technology relies on an opaque sheet with small pinholes to separate pixels both horizontally and vertically. Aperture grille technology employs a series of thin, closely-spaced vertical wires to isolate pixels horizontally. The pixels are separated vertically by the nature of the scan lines used to compose the image.

There are three advantages of the aperture grille method. First, this method allows more electrons to go through, resulting in a brighter image with better contrast. The second advantage is that the monitor's vertical resolution is not dependent upon the vertical spacing of pinholes. A third advantage of an aperture grille is that it is much less susceptible as compared to a shadow mask by warping caused by heat.

To keep the vertical wires in an aperture grille properly aligned within the picture tube, one or two horizontal damper wires are required. A 14-inch or smaller Sony computer monitor employs one such wire. It is located about a third of the way from the bottom of the screen. Sony computer monitors larger than 14 inches use two horizontal damper wires. These wires are each located roughly a third of the way from the top and bottom of the screen. Each wire casts a faint light gray shadow which appears as a horizontal line on the image. This shadow is not normally visible, but it may become apparent on displays with lightly-coloured backgrounds.


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