DMD television
The first DMD displays have appeared about thirty years ago, although the effect was discovered earlier and used to tsifrobukvennoy indication in hours, calculators and measuring devices. Then there matrix displays, which theoretically can reproduce black and white video. In 1987 the firm Sharp was shown the first pocket television with color display size of three inches diagonally.
Each element of the image are three primary colors cell
The most common type today, LCD, which is used in most laptops, monitors, televisions - is an active matrix. In such a matrix used mikrotranzistory TFT, which open and close the individual cell. For each pixel of color images of such cells on three main colors. A previous generation LCD displays (passive matrix) control signal leads to bus lines and an element in a row, but because her performance was little video. A typical active matrix TFT-LCD - a single-matrix liquid crystal panel, made on technology TFT. Production of such a matrix is very difficult because
marriage is invalid, it is necessary that all the transistors worked. And for a standard LCD display with a resolution of 800 pixels õ600 (regime SVGA) number of individual transistors is 1440000. TFT-displays are characterized by small time delay that allows for changing images almost in real time (suitability for video transmission, ie, television) with a good attitude and contrast. Through such features video playback without loss of quality. Active matrix are more brightness, richness and clarity of the image created, compared with passive matrix. For the best models of LCD panels has been achieved response time of about 16 ms.
Structure your LCD
The structure of modern LCD like a multilayered cake. Actually layer of liquid crystals placed between two polished transparent panels made from sodium-free and very pure glass, which bears the transparent electrodes and administering each cell structure TFT. At the glass panels are grooves that send crystals, telling them to a special orientation. Soprikasayas with grooves, molecules in the liquid crystals are oriented equally in all cells. With the two sides of the glasses are polarizers, which axis perpendicular. This is required because the plane of polarized light beam rotated 90 ° during the LCD layer. On the external side there are filters, which are formed pixel cells of three main colors (RGB). LCD panel televisions and monitors highlights a light source at the rear, that is working on the passage of light. Light from the lamp lights, passing polarizer and glass plate, falls into the liquid crystal layer. If the basic cell voltage is not filed, the passage of light through a layer of liquid crystal polarization rotated in accordance with the rotation axis optical crystal. As a result, the output will be light through the second polarizer, and this pixel display looks bright for an observer. If the pixel electrodes on the cell voltage is filed, it will be a light layer of liquid crystal without changing its polarization, and polarizer at the outlet not miss it. This pixel will look at the light black background. The main feature of LCD displays compared with tubes - a digital way of presenting images. That is, each pixel screen should match your digital image in the flow of data. Analogue TV tuner signal before feeding to be converted into digital display with a resolution that can physically display to display. When connecting digital source must conform permission, as if scaling restatement will result in the degradation of image quality (primarily the loss of clarity). With the submission of digital images and relates advantage of LCD displays - they have no geometric distortions.
Even more recently commercially profitable LCD television screen were a model with 13, 15 and 20 inches, the LCD is limited to the use of personal products. Currently on the market already has 30 - and 37 - inch widescreen model. Consumers are increasingly considering LCD models as family products and increasingly buy them as a major television in the living room. Currently, the annual market for LCD TVs is estimated 2-3 million units, representing only 2% of the total 130 millionth television market. Thus, there is a reasonable margin for the development of the share of LCD models. The point is that they provide good quality and constantly desheveyut. Moreover, there are already examples of LCD panels with a resolution of 200 pixels / inch - such permission in tubes already physically impossible. Many leading producers intend to discontinue the kineskopnyh television formats already large by 2005.
Most modern LCD panels belong to the sixth generation. Major manufacturers are already preparing the production of panels 7 generation (Samsung, AU Optronics) and even 7.5 (LG.Philips LCD, Sharp, HannStar, CPT, Quanta Display). For the seventh generation substrate has a standard size of 1870 mm h2200, and it can be cut into twelve 32 - inch, eight 40 - inch or six 46 - inch displays. For more generation 7.5 size, but depends on the manufacturer. At today announced the largest size (production will begin no earlier than in 2006) Sharp - 2200 õ2600 mm. Out of such substrates can already be done fifteen 32 - inch, eight 42 - inch or six 50 - inch panels.
Moreover, faces other problems: increasing quality and reducing the cost of LCD panels. One of the most important issues - is food. Consumption kineskopnyh televisions weakly depends on the size of the tube, but LCD is just a clear dependence, and increase substantially. Thus, the difference in energy between kineskopnymi and LCD television reduced from larger screen.
