Do we often wonder why the picture looks worse on one screen and better on the other? We just see it and that’s it. But picture quality is made up of a set of factors that are important to compare and analyze when choosing a new TV. So what exactly makes a picture bright, vivid and clear and what should every potential buyer pay attention to if he wants to acquire a really worthy equipment?
Which type of screen is best: suitable solutions for your home TV
As we said, the picture quality on a TV depends on the characteristics of a number of its systems. Here is the type of screen, and the type of image formation, and the possible resolution … But first things first.
First there was … the matrix
LCD matrices, that is, liquid crystal, quickly and confidently pushed plasma panels out of the market, which replaced CRT TVs, and became a truly massive variety of screens. It is on the matrix that such important parameters as contrast and image quality, color rendition and viewing angle depend. The first LCD matrices looked like a package of glass plates, and liquid crystals were placed between their layers, but at the beginning of the new century, glass was replaced by special flexible polymeric materials. LCD technology is based on the ability of liquid crystals to control the light flux passing through them under the influence of voltage. What types of LCDs are used in TVs?
TFT-TN-matrices are the simplest and most inexpensive. In the absence of tension, the molecules of the crystals in them form a kind of spiral, through which light passes almost unhindered, and a white point forms on the screen. When voltage is applied to the electrodes, the molecules change their position and do not transmit light, and the point changes color to black. All other colors are created by the rotation of the LCD elements, which occurs under the influence of voltage, as the polarization of the beam and the intensity of the luminescence of individual pixels change. Moreover, their color depends on the light filters – red, green and blue.
Despite the disadvantages, such as the inability to fully reproduce black color and the inability to see the image from an angle, TN-matrices are still in demand on the market. This is due to their low price, which allows the production of televisions in the budget segment.
Another type of TFT matrix is IPS, in which the electrodes are located only on the bottom plate. In the absence of voltage, the molecules are parallel to the surface of the screen and to each other, and the light passes through the first filter without changing polarization. Due to the fact that it is completely blocked by the second filter, the black color on the screen appears brighter, and when voltage is applied, the molecules, on the contrary, let in the maximum amount of light. The advantage of IPS is almost perfect blacks, good image contrast and viewing angles up to 180 °.
PLS matrices were created as an improvement over IPS. They feature higher pixel density, color reproduction and brightness, wide viewing angles, and a relatively low price point.
The TFT-VA matrix can be considered a compromise between IPS and TN. In the absence of voltage, liquid crystal molecules in such a matrix are directed perpendicular to the surface of the panel, due to this, the light is completely transmitted, and the dot on the screen glows white. If voltage is applied, the molecules unfold at an angle of 35–40 ° and block the light flux, making the point black. VA-matrices have a reduced response time, high contrast, deep blacks, large viewing angles.
Flat vs curved
Honestly, the choice between a flat or curved screen is a matter of personal preference, but for a home TV, experts advise choosing a classic flat screen. It has a better viewing angle and higher contrast, is less bulky, and fits better with the interior. Curved TVs are more suitable for shows or exhibitions.
Matte vs Glossy
Another important question of choice: which screen to prefer – matte or glossy? Glossy screens offer brighter, richer pictures, higher contrast and deeper blacks. However, glossy screens are very reflective when hit by any light source. There are two ways to solve the problem: do not place the TV in front of a window, or choose a matte screen. But here, too, there are some nuances.
Matte screens do not glare, they are not afraid of direct light rays, but compared to glossy screens they have a less bright picture.
PDP technology, or plasma.
Plasma televisions were the first to replace their “fellows” on a ray tube. Everything was attractive in them: the brightness of the image, the incredible diagonal of the screen, the depth of the image. Structurally, such a screen is made of glass plates, between which there are cells with phosphors mixed with an inert gas. When the voltage is applied, the gases under the influence of the electron flow pass into the plasma state, and the inert gas begins to glow. In this case, the glowing process is controlled and ordered, and the image on the screen is created from hundreds of thousands of plasma lights. The plasma screen does not need illumination, since each plasma cell itself acts as a light source. But at the same time, the plasma gradually lost ground. This was partly due to the high power consumption, and partly due to the large bulkiness of the TVs. In addition, the high temperatures inside the PDP panel inevitably lead to pixel burnout and the appearance of a residual silhouette effect on the screen.