First check the aggregation function. Use the test grid generated inside the Chongqing projector or the signal generator and the computer to adjust the focus to the best position, change the contrast of the picture from low to high, and investigate the level and level of the grid. Whether the vertical lines are defocused. If ever, it clarifies that the aggregation function is not good.
Secondly, check the horizontal scan tracking frequency scale, select the high, medium, and low frequencies according to the horizontal scan frequency scale given on the technical indicators, and calculate the picture resolutions corresponding to the three frequency points. Check whether the Chongqing projector can display normally under these three resolutions. If the line is out of sync, that is, the screen is twisted or jittered, it indicates that the horizontal scan tracking is poor. Check the video bandwidth, the video bandwidth directly affects the details of the video.
Use a computer or signal generator to generate a high-resolution white background graphic signal that the projector can achieve, and investigate whether the small character graphics on the screen are clear. For example, when the video bandwidth of the Chongqing projector is lacking, the horizontal lines displayed on the screen are relatively solid, while the vertical lines are faint, and the details of the picture are ambiguous.