1, using the art
to move the digital signal using the world’s most advanced digital TV SFN technique (DTTBigital Television Terrestrial Broadcasting, i.e. the terrestrial digital TV broadcasting system, a digital television transmission one of the three ways), 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.
Car TV television is placed in the
2, Car LCD TV to watch the car above
How to choose the 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.
3, car LCD TV Parameter Index
1, pitch
Pitch generally refers to the distance between two adjacent display pixel dots. 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. 2, the resolution of
Resolution is one of the most important of all car LCD TV purchase specifications, the higher the resolution, the better the display. Due to the size Car LCD TVs are relatively small, the resolution can reach 720times; 480 is a good LCD screen, and the clarity of the screen is also very high. 3, the luminance
The maximum luminance car LCD TV, usually determined by the backlight, current luminance value of the liquid crystal panel in generally 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. 4, 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 will appear 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. 5, viewing angle
the human eye is capable of viewing angle to a maximum angle viewing the display content on the screen, the larger 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. 6, the 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. GenerallyHe said response time is 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 reaction time of the human eye, the 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. 7, color
Car LCD TV is of course important to the performance of the color. 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 64times; 64times; 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, the vehicle-mounted LCD selection
1. Size Selection
It is for passenger cars, the choice of a LCD TV 15 inch, 17 inch, 19 inches, 26 inches.
Currently for Pakistan, for in-vehicle television on the bus, size selection is the first step size is too large, not only a waste of investment, but also occupy a larger space, so the choice of size is very important, usually 7 meters or less buses usually choose 15-inch 7 to 10 meters with a 17-inch or 19-inch, 10 meters using multiple buses 17 or 19 inches. Large luxury buses using 26 inches. Sleeper car uses more than just 15 inches. 2, select the installation mode
is usually long-distance passenger manually inverted version of the product, of which there are inverted before and after inversion points, usually electric limousine bus flip products, luxury car will appear throughout.
Bus advertiser select the fixed installation, the product is installed on a vehicle, the customer can not fold up the LCD panel, to ensure product permanently in a display state. 3, the choice of television voltage
is usually 12V car gasoline engines, diesel vehicle is 24V, corresponding to a voltage should be selected consistent product. Here 12,24V not recommended to choose the so-called universal wide-voltage products, the failure rate will be very high. Currently regular domestic and foreign manufacturers Car LCD TVs use 12V, 24V divided voltage design. 4. Select LCD
to select a new screen Car LCD TV is the biggest wish of each customer, but currently on the market can see a large number of second-hand refurbished using Car LCD TV panel production, the price is very low , there is no guarantee of product quality, we give some methods to distinguish the old and new liquid crystal panel in this:
a, the current mainstream screen size: 15 inches (4: 3), 17 inches (4: 3), 19 inches (16: 9 widescreen). In case of other dimensions, and the price has been particularly low, we should pay attention to the quality of the screen.
B, see brightness, high or too low should be particularly noted that the current 15-inch luminance between 250-400, 250-500 between 17 inches and 19 inches between 300-550. Certainly the old screen is too low, too high, there may be refurbished the screen. Currently the old screen plus the lamp has been no secret. For lamp transformed the old screen, you can play some monochrome images, we can see light leakage.
C, look at the interface, if the current factory of car LCD TV or an analog interface, it does not need to choose. LVDS digital interfaceAs early as three years ago it has been the mainstream of the interface. 5, down screens to select
restrict car use environment, resulting in lower demand for particular perspective, and thus the use of inverted screen technology is an important technology currently onboard liquid crystal. Whether the car is inverted screen TV products, lighting products as long as the upper and lower contrast look instantly determine it. 6, explosion-proof treatment
Car LCD TVs are used in public places, it is extremely important to protect the LCD, so when selecting a car LCD TV, choose products with explosion-proof treatment should be preferred. Especially in the bus should be mandatory.
In addition, if possible, should try to choose the HD line of products, after all, the player output image sharpness have been very high, at the time of image performance, high-definition line has a very good performance, in addition to select stable and reliable line foreign products, after-sales service is also an important choice. Do not avoid selecting assembled products, even if these products promise 3 months replacement, but it did not conduct a comprehensive congenital optimize product design, and back can not solve the problem.
Finally, I wish you choose on a bed of roses Car LCD TV products.