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Analysis of Color Number of

Text:[Big][medium][small] time:2018/12/12 10:54:37    Views:    

       The number of colors

       LCD TV color number is the LCD TV can display up to the number of the total number of colors. LCD TV color number determined by two factors. One is the LCD panel can express the number of colors, one is the internal circuit can handle the number of colors.

       The number of colors that can be expressed by a liquid crystal panel is determined by the innate physical properties of the panel. According to the basic principle of liquid crystal display imaging, liquid crystal molecules by the upper and lower glass substrate between the voltage driven by the corresponding angle of deflection, the light through the liquid crystal layer will be based on the size of the liquid crystal deflection angle to obtain varying degrees of transmittance, This is reflected in the panel has a different gray level contrast level. When the light through the liquid crystal layer also need to pass through the filter, the filter corresponding to each pixel and divided into red, green, blue small square, the original white light from these small box came out after being filtered out , The whole panel can show a variety of colors, which is the panel can display a simple picture of the simple principle.

       When the image signal into the product inside the time, the circuit will be the transmission mode of the signal processing, converted into the screen display signal, the signal conversion process needs to be completed through the chip high-speed operation, the chip processing capacity determines the results of the operation Accuracy, which is the internal circuit can handle the number of colors.

       The so-called tuner

       LCD TV tuner, the official name is called high frequency tuner (tuner), is the TV can receive cable radio and television signal of the key devices.

       The traditional analog TV tuner is to simulate the way to complete the process of receiving amplification, gating, frequency conversion, picture sound demodulation, if there are distortion and distortion, will make the received image and sound quality deterioration. LCD TV is a digital TV, the first analog TV signal into a digital signal, compression, transmission, reception, processing, storage, recording and control, the receiving terminal first by the digital TV tuner for high-frequency amplification, comparison processing, channel decoding And demodulation, and then by the receiver back-end circuit for source decoding and other processing to restore the image and sound, if one of the distortion will cause error error, if beyond the tuner can control the range, you can not receive the image and audio.

       The performance of the tuner has a great influence on the quality of the cable broadcast television signal receiving system. In terms of electrical performance, the high frequency head with low gain and low temperature coefficient should be selected. The high frequency head with poor quality is produced under different environmental climatic conditions Frequency drift caused by treadmill phenomenon, so buy high frequency stability of the tuner to ensure stable operation of the system. The frequency band received by the tuner is divided into VHF (Very High Frequency) and UHF (Ultra High Frequency), the former is the frequency range of 30MHz-300MHz band, the latter is the frequency range of 300MHz-3GHz Band. 1 tuner can only receive a cable TV signal at the same time, only with dual tuner LCD TV can receive two different cable TV signal, in order to achieve two different channels of dual-screen display.

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