How to measure the color LED dot matrix display?
How to measure the color LED dot matrix display?
The color LED dot matrix display is the same as monochrome.You can use short columns or rows of methods to detect,just a little cumbersome operation,each pixel to test three times,to detect the corresponding three colors to show whether normal.First,according to the method of detecting monochrome LED dot matrix display,the rows,columns and the corresponding arrangement are judged,and then the luminous situation is judged according to the following methods. Check the situation of green light. The line B', e'.d', E', f.k'.h' (23, 20.17.14.2.5.8, 11) are short connected to an elicitation end, set to Z end, the negative electrode of the battery is connected to the Z end, and the terminal line of A.B.C.D.E.F.G.H (22, 19.16, 13.3.6.9.12) is used in turn, and the corresponding 8 row pixels should be green light at the same time. For example, when the battery's positive line touches 22 feet, the corresponding A line and 8 cables should emit green light at the same time.
Examination of red light. The column a:b, C, D.E, f.g.h (24, 21.18, 15, 1, 4.7.10) are short connected to a leading end Z,the negative electrode of the battery is connected to the Z'end,and the positive line of the battery is in turn to contact A.B.C.D, E, F.G.H (22, 19.16.13.3.6.9, 12) end line,and the corresponding 8 row pixels should send red light at the same time.For example,when the battery's positive line touches 22 feet, the 8 pixels of the A line should emit red light at the same time.
check the situation of all light (Orange).On the basis of the first two steps of detection,the short ends of both Z and Z'lead to the second end,which means that all the columns are short ended.The negative electrode of the battery is connected to the Z "end, and the end line of A.B.C.D.E.F.G.H (22, 19, 16, 13, 3.6, 9, 12) is in turn with the positive electrode line of the battery, and the corresponding 8 rows of pixels should send orange light.
short line drive line detection method
Figure 10-11 is a short line drive line detection chart.
check the situation of green light.The short connection of the line drive line A.B, C.D.E.F.G.H (22, 19, 16, 13, 3, 6, 9, 12) is merged into an elicitation end and is set to Y.The positive electrode line of the battery is connected to the Y end. The negative electrode line of the battery is in turn in contact with a'.b'.c', d.e'.f', G', H' (23, 20.17, 14, 2.5.8.11),and the corresponding column pixels should be green light at the same time. For example,when the negative electrode of the battery is connected to the 23 leg (X end),the 8 pixels of the a column should send out green light at the same time.
Examination of red light.The line connection with the positive electrode of the battery is the same as that of the first step.Using the negative line of the battery to contact the A and b.c.d.e.f.g.h (24, 21, 18, 15, 1, 4, 7, 10) ends of the column drive line,the corresponding column pixels should be red at the same time.For example,when the negative electrode of the battery is connected to the 24 leg (X'end),the 8 pixels of the a column should emit red light at the same time.
check the composite light (Orange).The positive line of the battery remains unchanged. When the ends of X and X'are short circuited (that is,short circuiting 23 feet and 24 feet) and lead to X ends,8 pixels of the a column should be orange colored at the same time. According to this method, 20 feet and 22 feet,17 feet and 18 feet,14 feet and 15 feet,2 feet and 1 feet,5 feet and 4 feet,8 feet and 7 feet,11 feet,and 10 feet were tested respectively.The pixels of the corresponding b.c.d.e.f.g.h column should send out orange light respectively.When using high brightness LED tube,it should be noted that the test voltage should be at 5~8V, otherwise the fast detection method of LED.should not be lighted,and all line lines short connection,line line short connection,battery positive pole connection line,negative electrode connection line,check light condition,all diodes should be illuminated at this time,indicating that the LED point array is good;if some point does not shine or certain line,some The LED dot matrix is bad when the column does not shine.