Differences between Character LCD Modules TV and Monitor

To transform the liquid crystal display manufacturers production lines to produce TV, they have to overcome several problems in display technology. First, the larger screen and format of the different issues to be resolved. Most laptops have 14-inch XGA format (1024 × 768 pixels), while most desktop LCD monitors with a 17-inch SXGA format (1280 × 1024). Large-screen LCD TV's entry-level products are not less than 30 inches, and are using a wide screen XGAPlus format (1366 × 768). 40 inches or more large-screen LCD TVs have adopted a true high-definition television (HDTV) format (1920 × 1080), but also high-end products on the market. In terms of the data required for each frame as a reference for comparison, high-definition television format required data format than the width of the screen is 2.5 times more XGAPlus.
As more and more 160x160 lcd display with XGA and SXGA format, so manufacturers must further reduce power consumption and reduce electromagnetic interference, the differential signal transmission technology and data transmission circuit design has become mainstream solution in this regard. In accordance with the transmission line theory, the signal path shall be deemed waveguide (waveguide), rather than just a bad connection, which ensures that the signal transmission can still maintain its waveform. New technologies available, the digital pixel data can be directly transferred to each of the column drivers, and fast transmission speed, so that all the pixel data to be 1/60 second frame time typical write column drive.
Input TV signals must have a high degree of integrity, this requirement and notebook displays and general display is no different. However, large-screen TV on the signal more new requirements, which is the system monitors and notebook displays common signal transmission technology can not be met. In addition to be able to support a large screen, the new signal transmission technology but also to meet the other requirements. Larger screen of TV, the video signal is bound to a longer transmission distance, so the impedance mismatch caused by the number of defects and the possibility of cross-coupled interference * increases. Moreover, the television column circuit board length are generally the same width of the screen, but the screen of the TV of 30 inches, the column circuit boards will be divided into two, because of the printed circuit board is limited by the manufacturing process, size a certain limit, the circuit board is divided into two signal paths would appear more connection points, greatly increasing the chance of error signal, which is also the signal path designs become more complex, had hoped to shorten the circuit's desire to save space would be defeated. According to the current development trend estimates, the screen refresh rate will be gradually increased to 90-120 Hz, in order to avoid an active matrix liquid crystal display because you must perform a scan and hold function and cause blurred motion picture of the phenomenon.
In addition to high-definition TV signal integrity stringent requirements of the above, the gray level of each pixel is more than a computer monitor. LCD TV must be 30 pixels (red, green and blue colors have 10 gray), rather than computer monitors widely used 24 pixels. LCD TV must be 30 pixels, brightness gradient shallower in order to ensure that the case, for example, shows the evening sky or the vast sea, the image does not appear silhouette edges. If we follow the brightness quantify spatial gradient will produce a significant and unexpected lines. Because TV is generally used light and dark contrast more strongly the design, so this flaw is even more evident on television.
LCD monitor can not be fully demonstrated the contrast dark environment, because the display can not be inside each pixel light valve are turned off. In other words, the light valve leak. The current generation of high-end LCD televisions have adopted advanced technology, 1000:1 contrast ratio approaching, but the contrast of conventional LCD TV is only about half of high-end products. Image processing technology appears, a substantial improvement in the situation. This image processing technology can examine the image frame-by-frame, and the expansion of major brightness range, so that the brightness range is small (ie, low contrast) image can be adjusted by increasing its gray level to enhance grayscale effect.
For TV, the current consumers are most concerned TV color effects. If different brands of TV together to compare, most consumers are brilliant with color indicators as part of their purchase. For this reason, the industry has been trying to study how the different colors of the image set into the 320x240 lcd display screen accurate color space. The color set into the mapping is done by the image, the mapping process of the image into the appropriate lumen and color space, and the image in the process will be highlighted certain colors, other colors will fade. After this treatment, the red, green and blue color accuracy than the original color image is more accurate, so the TV must be 10 gray (30 pixels) before proper treatment and to improve the image, in order to avoid significant gray ladder flaws.