Method for improving liquid crystal television definition
A technology of LCD TV and picture quality, applied in the direction of TV, electrical components, image communication, etc., can solve problems such as TV picture quality interference, achieve the effect of improving picture quality and eliminating twill interference.
Active Publication Date: 2009-09-30
SICHUAN CHANGHONG ELECTRIC CO LTD
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[0003] The technical problem to be solved by the present invention is: to propose a method for improving the picture quality of LCD TVs, and to solve the problem of interference of the clock signal of the LCD screen and its multiplier signal on the picture quality of the TV
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[0017] This example uses LT42900FHD with LC420WUN-SAA1 LCD screen as an example to illustrate. The specifications of the LC420WUN-SAA1 LCD screen clearly state that the minimum pixel clock frequency of the screen is 70MHz, the maximum is 77MHz, and the typical value is 74.25MHz.
[0018] When watching the TV signal of 4CH channel, in order to receive the signal of this channel, the high-frequency head on the motherboard will mix the high-frequency signal of the image and the high-frequency signal of the sound, and beat the signal of the local oscillator to obtain the image of the channel The intermediate frequency signal and its first sound intermediate frequency signal are then sent to the image intermediate frequency amplifying circuit. Assuming that the current pixel clock frequency is 74.25MHZ, and the image intermediate frequency of the 4CH channel is 77.25MHZ, it can be seen that the frequency of the two is very close, and the frequency difference between the two is calc...
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The invention relates to video frequency display technique, especially a method for improving liquid crystal television definition which solves the problems of disturbance to the television definition by the liquid crystal clock signal and its frequency doubling signal. The technical scheme has the key points as follows: a. tuning a certain frequency channel on the liquid crystal television; b, detecting the IF frequency of the frequency channel; c. judging whether the current clocking frequency or its integral number double frequency of the liquid crystal television approaches to the IF frequency of the frequency channel, if yes, operating step d, else, failing to act; d. adjusting current clocking frequency in the liquid crystal television clocking frequency range; judging whether changing the frequency channel, if yes, returning to step b, else, failing to act. The advantages of the invention is eliminating the tweel disturbance, improving the definition of the image and suitable for the liquid crystal display terminal.
Description
technical field [0001] The invention relates to video display technology, in particular to a method for improving the image quality of a liquid crystal television in the field of video display technology. Background technique [0002] In the design of LCD TV, the display driving of LCD screen is very important. In addition to providing the power supply voltage for driving the LCD screen, it is also necessary to output differential pair signals to drive the LCD screen display. The driving signal of the liquid crystal screen is usually 1 pair of clock differential lines and 4 pairs of signal differential lines, and the pixel clock frequency of the signal differential lines is usually between 60MHz and 80MHz. For various liquid crystal screens widely used at present, a pair of high-frequency clock DCLK signals will be added to the differential pair signals. For example: if the LCD screen displays 1100 dots per line, the refresh line frequency is 65.5-68.9KHz, its pixel clock ...
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Inventor 梁敏
Owner SICHUAN CHANGHONG ELECTRIC CO LTD