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>> LCD module: common parameters 7th,Nov,2018
Electrical characteristics:
In order to display the content to be lit, an AC drive voltage must be applied between the segment electrode of the LCD and the common electrode. In order to ensure the display effect and extend the working life of the liquid crystal, it is necessary to use an alternating current voltage (AC) instead of a direct current voltage (DC).
The LCD can be static or dynamic. The static drive features high contrast, uniform display, fast response and easy control. However, since each segment is driven separately, the number of electrodes is large. Therefore, dynamic driving is usually used.
LCD drive waveforms can be described in three ways:
parameter
Explanation
LCD drive voltage (VLCD)
The driving voltage of the LCD is the difference between the segment voltage applied to the lit portion and the common voltage (peak-to-peak)
Duty cycle (Duty)
In order to reduce the number of electrodes on the LCD, multi-channel driving is used, and the voltage of the LCD is an AC waveform. The Dudu of the LCD is the ratio of the portion of the threshold voltage that is higher than the threshold voltage in one cycle.
Bias ratio ( Bias )
The driving waveform of the LCD is composed of several levels. In order to prevent the contrast from being uneven, a certain voltage is applied to the electrode corresponding to the non-lighting pixel, which reduces the cross interference caused by the lighting pixel and prevents the contrast from being uneven. important. The ratio of the voltage effective value of the non-lighting pixel (non-selected point) in the LCD to the effective value of the lighting pixel (selection point) voltage (1/n) is called the bias ratio.
When ordering a liquid crystal display, the selected drive voltage, duty cycle, and bias ratio should match the driver.
Temperature characteristics:
Liquid crystal display products have higher temperature requirements and are generally classified into two types: normal temperature type and wide temperature type. The specific application range is as follows:
Type temperature range
Operating temperature
storage temperature
Normal temperature type
0 °C - 50 °C
-10 ° C - 60 ° C
Wide temperature type
-20 ° C - +70 ° C
-30 ° C - +80 ° C
In addition, if the special environment requires a larger range of liquid crystal products, such as military supplies or scientific research supplies, special ordering is required.
Working perspective:
The contrast of the liquid crystal display changes with the change of the viewing angle, which is the maximum angle between the viewing direction and the plane normal of the liquid crystal display. If the surface of the liquid crystal display device is regarded as a clock face, the viewing angle can be divided into four types according to the direction of the observer's line of sight: 12:00, 3:00, 6:00, and 9:00, but the most commonly used is 6 Point and 12 o'clock viewing angle products.
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