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PS12801ARN-0 参数 Datasheet PDF下载

PS12801ARN-0图片预览
型号: PS12801ARN-0
PDF下载: 下载PDF文件 查看货源
内容描述: 外形尺寸与框图 [OUTLINE DIMENSION & BLOCK DIAGRAM]
分类和应用:
文件页数/大小: 65 页 / 1282 K
品牌: POWERTIP [ POWERTIP TECHNOLOGY ]
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Powertip USA  
Page 5 of 6  
11. Clarification to the term "rainbow" effect:  
This refers to a red and green circle or rainbow on the LCD glass. The LCD panel  
under uneven pressure causes this problem from the bezel. It is very common in LCD  
modules and normally it will not affect the performance or the appearance of the  
display when operational.  
12. Pin assignments for a Character module:  
Example of a standard 14-pin character module:  
PIN 1: Vss  
PIN 2: Vdd  
PIN 3: Vo  
PIN 4: RS  
PIN 5: R/W  
PIN 6: Enable  
PIN 7 ~ 14: DB0 ~ DB7  
13. What is temperature compensation and why is required  
A LCD operating voltage varies at different temperatures. The operating voltage must  
rise as temperature lowers or the contrast will degrade. Conversely, the operating  
temperature must fall as the temperature rises or the contrast will degrade. For this  
reason it is often a requirement, with graphics modules, to control the input voltage  
accordingly. The temperature compensation circuit is the circuit that controls the input  
voltage as the temperature changes. This temperature compensation circuit can be  
located on the LCD module or on the customer's motherboard.  
14. Troubleshooting a LED backlit module in which the display is turning  
dark:  
This problem is more than likely caused by the temperature rise from the LED  
backlight. In this case the LED backlight has consumed too much of the power. When  
the temperature rises, the VLCD becomes lower causing the input voltage to be too  
high. The result is a poor contrast and the display becoming too dark. The solution  
would be to lower the power consumption of the LED. This can be accomplished by  
raising the value of R8 or R9 to reduce the current to the LED backlight.  
15. How to control the LED backlight on a 14-pin module:  
Short J2, the Vdd is controlling the input to the LED backlight. In addition, it is  
necessary to place a current limiting resistor to lower the voltage from 5V to 4.2V.  
Note: If the LED is drawing too much current, it may cause the Vdd † Vo too low and  
the contrast becomes poor. If this should occur increasing the value of R9 should  
decrease the current draw to the LED backlight or another approach would be to  
increase the voltage input to the LCD by decreasing the value of R7.  
16. Examples of the current consumption of an LED backlit, EL backlit and  
the LCD for the following modules:  
http://www.powertipusa.com/qa.htm  
11/10/2004  
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