vehicle TV is installed in an automobile, vehicle mobile TV broadcast system, which emits a digital signal through a wireless, terrestrial digital device receives manner, playback of television programs and the advertisement program.
1. car TV noun interpretation
is the way the vehicle-mounted terrestrial digital television reception device installed in an automobile, vehicle mobile TV broadcast system, which transmit digital signals by radio, performed broadcasting of television programs and advertising programs.
2. The car TV technology used
Mobile digital signal using the world’s most advanced digital TV SFN technology (DTTBigital Television.
Terrestrial Broadcasting, namely terrestrial digital television broadcasting system, is one of three ways the spread of digital television) , digital signal transmission by wireless, terrestrial television broadcasts received the method proceeds. Where the movement of vehicles (such as mass transit, water bus, car, etc.) or the desire to reach the flow distribution sites (such as railway stations, docks, all types of shopping, leisure facilities, etc.), just install the appropriate receiving equipment, relying on appropriate size LCD screen, the digital TV can receive various types of information to mobile information supplied exclusive television.
3. Car LCD TV parameter index
● Pitch
Pitch generally refers to the display of two adjacent pixel dots the distance between. Under certain preconditions screen size, the sharper the smaller the dot pitch delicate screen. Pitch is obtained by the visual area divided by the resolution of the data out. General LCD screen is 0.279mm dot pitch can produce a very delicate picture. For car TV, a commonly used CF card players, in-car hard drive to play pitch, car LCD TV can meet the requirements, and therefore it need not be a concern of indicators.
● Resolution
Resolution is one of the most important of all automotive LCD TV purchase technical indicators, the higher the resolution, the better to display. Due to the size Car LCD TVs are relatively small, the resolution can reach 720 × 480 is a good LCD screen, and the clarity of the screen is also very high.
● Brightness
Maximum luminance car LCD TV, usually determined by the backlight, current luminance value of the liquid crystal panel is generally in the 250 ~ 500cd / m2 room. LCD brightness over high, the bright picture, but the price will be more expensive; low brightness, the screen will feel dark. Less than 250cd / m2 or less screen does not normally choose.
● Contrast
Contrast car LCD TV is also very important, the higher the contrast, the more vivid color saturation, also appears more three-dimensional, low contrast contrast, color it will become barren, dry plate. In contrast, typically 250: 1 or more suitable high approximately 400: 1. The contrast ratio of less than 150: 1, do not choose.
● viewing angle
the human eye is viewing angle can be viewed on the screen show the maximum content point, this value is the better. If the viewing angle is relatively small, the user’s eyes a little bit biased (that is not facing the screen), it would screen distortion, or even impossible to watch. Ideally Car LCD TV viewing angle should be 60 degrees or more (horizontal, around the screen), the vertical viewing angle is 70 degrees or more, in consideration of the cost, the LCD screen is usually designed on the viewing angle is 75 degrees, the viewing angle is 55 degrees. Without treatment technology, such as onboard television is wasted on viewing angle, Perspective can not meet requirements, and therefore need to be down car LCD TV screen processing, coming down perspective upside down, in order to meet the in-vehicle environment.
● response time
This indicator is important because it is related to whether the screen will appear smearing. Refers to the reaction or response time of the liquid crystal turned dark by the bright or dark by the time required for the next turn. In general the response time as short as possible. The shorter the time, while watching moving pictures will not feel similar to blur the traces or procrastination. According to the human eyeReaction time, response time exceeds 100 milliseconds, hysteresis occurs moving image. Currently manufactured LCD response time of most standard is between 50-80 milliseconds, but there are a few high-end LCD mostly in reaction time of 25 to 30 milliseconds. If the LCD response time is about 80 msec, does not substantially appear in the tail while watching the video. But it notes that the reaction time including rise time and fall time, some manufacturers indicate only rise or fall time in the “response time” at mislead consumers.
● Color
Car LCD TV is of course important degree of color performance. We know the nature of any one color is red, green, blue three basic color composition. LCD color of each individual pixel is composed of red, green and blue (R, G, B) to control the three primary colors. Most of manufacturers out of a liquid crystal display, for each basic color (R, G, B) reaches 6, i.e., 64 kinds of performance, then each individual pixel have 64 × 64 × 64 = 262144 colors. The vast majority of true color LCD is only around 26 million colors (262,144 colors), including some tens of thousands of the best LCD is the same. Manufacturers of 32-bit color marked (16.7M color or 16,777,216 colors) are obtained by interpolation or dithering algorithm, there is a considerable gap compared with the 32-bit true color. As long as the LCD screen can reach 26 million colors, the screen can show a good color.
These are some of the more important of the LCD screen reference data, of course there are many more ways to reference data and monitor the quality of the LCD screen. But as long as consumers can refer to the above-mentioned seven critical data, you’ll get the satisfaction of car LCD products.
4. How to choose car LCD TV
Car LCD TV as the name suggests is the use of the LCD screen (LCD) as a display carrier Car TV, Car conventional CRT TVs, car LCD TV has a very clear technological advantage, as in 2008 LCD panel prices continue to decline, the current car LCD TV has completely replaced the traditional CRT car TV.
The main car LCD TV has the following salient features: small size, light weight, completely flat, low power consumption, no flicker without distortion. Select Car LCD TV first understand some basic parameters indicators.