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<table border="0" cellpadding="3" cellspacing="1" width="100%" class="forumline"> <tr> <th class="thCornerL" width="22%">Autor</th> <th class="thCornerR">Wiadomość</th> </tr> <tr> <td width="22%" align="left" valign="top" class="row1"><span class="name"><a name=""></a><b>rjw913d3k</b></span></td> <td class="row1" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><img src="http://picsrv.fora.pl/Elveron/images/icon_minipost.gif" width="12" height="9" alt="Post" title="Post" border="0" /><span class="postdetails">Wysłany: Sob 3:29, 26 Mar 2011<span class="gen"> </span> Temat postu: No electrolytic capacitors in the drive power LED</span></td> </tr> <tr> <td colspan="2"><hr /></td> </tr> <tr> <td colspan="2"><span class="postbody">After the image appears a photosensitive efficiency,<a href="http://www.advertiseall.com/" target="_blank" class="postlink">LED open sign</a>, and the subject of the image overlay, image in the camera produces similar results as the water ripples (Figure 1) results. 3, the solution of Figure 2 results from the analysis, there are two ways to reduce the effect of such interference, one approach is to try to artificially increase the distance between the midpoint of the two dot matrix optical gap, corresponding to a point as much as possible the number of mid-point of another matrix, so that the efficiency of each point of the photosensitive similar LED display solution is to increase the density of points, <br /> so that photographic equipment sensor corresponding to each point on the number of LED points; Another way is to make LED display screen light-emitting area of the body points in the share of the total area increased, so reducing the dark zone, you can completely change the efficiency of the sensor between points of different problems in order to improve the "ripple" problem. Figure 3 confirms the results of the above from another point of view of inference. <br /> Scan screen appears indoor horizontal stripes when we scan the line of indoor video screen when the body will often appear as shown in Figure 4,<a href="http://www.advertiseall.com/" target="_blank" class="postlink">menu board</a>, horizontal stripes, the principle is very simple display of the line scan frequency is too low, then What we need to solve the scanning frequency of such problems? <br /> As the basic elimination of this phenomenon, the shutter open time line of the scan cycle requires more than 5 times. Normal indoor shooting, the shutter open time is about 1 / 200 1 / 60 seconds,<a href="http://www.advertiseall.com/" target="_blank" class="postlink">portable displays</a>, so in order to capture the ideal image, the data requirements of the screen refresh rate must be above 1,000 Hz, but the driving principle and the traditional devices are difficult to accomplish this specification. <br /> And with multiple rows of data memory and the PWM constant current driver IC function coupled with a dedicated display controller, can achieve such specifications, to achieve customer requirements, as shown in Figure 4. Loss of gray-scale outdoor LED screen appears and the gray scale display device is lost, particularly the loss of low gray scale, the impact to the display is well known, we often encounter the phenomenon of the display of gray-scale loss of two, and now were introduced as follows: (1) when the loss of non-linear gamma correction, most of such losses are reflected in the loss of low gray scale, and as long as the nonlinear correction to increase the number of bits,<a href="http://www.advertiseall.com/" target="_blank" class="postlink">display boards</a>, you can completely solve the problem</span></td> </tr> </table></td> </tr> <tr> <td colspan="2" height="1" class="spaceRow"><img src="http://picsrv.fora.pl/Elveron/images/spacer.gif" alt="" width="1" height="1" /></td> </tr> </table>
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