Ghost image elimination method for shutter type three-dimensional (3D) liquid crystal television

Abstract

The invention relates to the field of liquid crystal televisions, and discloses a ghost image elimination method for a shutter type three-dimensional (3D) liquid crystal television. The method specifically comprises the following steps of: setting N paths of pulse width modulation (PWM) circuits and N groups of light-emitting diode (LED) backlight units, wherein the N paths of PWM circuits correspond to the N groups of LED backlight units respectively; dividing each frame of image into N areas corresponding to the LED backlight units, and after a frame of image is prepared, controlling the Nth path of PWM circuit by using a master chip to turn on the Nth LED backlight unit and display the Nth area of the first frame of image, and preparing the data of the (N-1)th area of a second frame; and finishing the display of the N areas within the display time of each frame of image. The image of each area is displayed in turn to finish round robin within the display time of each frame of image, the corresponding contents of the next frame are prepared when the image of the previous frame is displayed, and the preparation time of each frame of image is the sum of (N-1) / N of the image display time and blanking time. Therefore, the slow response of liquid crystal molecules is greatly improved, and the ghost images of the shutter type 3D liquid crystal television are effectively eliminated without influence on watching effects.

Description

technical field [0001] The invention relates to the technical field of shutter 3D liquid crystal televisions, in particular to a method for eliminating ghost images of shutter 3D liquid crystal televisions. Background technique [0002] Since the liquid crystal is a holding type display device, the reaction speed of the liquid crystal molecules is slow, and the response time is at the ms level, almost more than 10 ms. The signal sent from the main chip of the TV to the LCD screen generally works at an integer multiple of the frame frequency of 60hz or 50hz. , for the working frequency of 60hz (in the present invention, there is no special explanation for the convenience of calculation, 60hz is taken as an example), the duration of one frame is 16.67ms, if the response time of the LCD screen is 10ms, then from the current frame (Defined as L frame) When switching to the next frame (defined as R frame), each frame will contain a switching process from L->R or R->L, and i...

AI Technical Summary

Problems solved by technology

[0002]Because the liquid crystal is a holding type display device, the reaction speed of the liquid crystal molecules is slow, and the response time is in the order of ms, almost more than 10 ms. The signal on the screen generally works at an integer multiple of the frame frequency of 60hz or 50hz. For the working frequency of 60hz (in this invention, for the sake of calculation, there is no special description, all take 60hz as an example), the duration of one frame is 16.67 ms, if the response time of the LCD screen is 10ms, when switching from the current frame (defined as L frame) to the next frame (defined as R frame), each frame will contain a frame from L->R or R->L The switching process, and it can be seen within the frame period, so that no matter when the 3D synchronous switching glasses are synchronized, no pure L or pure R can be seen. Poor or even lack of functionality with no 3D effect

In the existing technology, one frame of image is displayed at the same time, and the backlight is turned on at the same time, so that if the switching time of two adjacent frames does not consider the blanking time, there is no buffer time, which is not conducive to compensating the defect of slow reaction speed of liquid crystal molecules

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