LCD, abbreviated as Liquid Crystal Display, has become a widely used display material due to its numerous advantages. It is widely used in the industrial control industry. Today, the editor will introduce its common parameters to you:
Electrical characteristics:
To display the content that needs to be lit, the AC driving voltage must be applied between the segment electrode and the common electrode of the LCD. In order to ensure the display effect and extend the working life of the LCD, AC voltage must be used instead of DC voltage.
LCD display screens can be driven either statically or dynamically. The characteristics of static driving are high contrast, uniform display, fast response speed, and easy control. However, due to each segment being driven separately, there are more electrodes. Therefore, dynamic driving is usually used.
The LCD driver waveform can be described from three aspects:
parameter
LCD Driver Voltage (VLCD)
The driving voltage of LCD is the difference between the segment voltage applied to the illuminated part and the common voltage (peak to peak)
Duty
To reduce the number of electrodes on the LCD, a multi-channel drive is adopted. The voltage of the LCD is an AC waveform, and the duty cycle of the LCD is the proportion of the part that exceeds the threshold voltage for illumination in one cycle.
Bias
The driving waveform of an LCD display screen consists of several levels of voltage. To prevent uneven contrast, a certain voltage is still applied to the electrodes corresponding to the pixels that are not illuminated. This is important for reducing cross interference caused by illuminated pixels and preventing uneven contrast. The ratio (1/n) of the effective voltage of non illuminated pixels (non selected points) to the effective voltage of illuminated pixels (selected points) in an LCD display screen is called the bias ratio.
When customizing LCD displays, the selected driving voltage, duty cycle, and bias ratio should be compatible with the driver.
Temperature characteristics:
LCD display products have high temperature requirements and are generally divided into two types: room temperature type and wide temperature type. Their specific application scope is as follows:
Type temperature range
working 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
If special environments require LCD products with a wider range of adaptability, such as military or scientific research products, special customization is required.

Work perspective:
The contrast of a liquid crystal display varies with the angle of view, which is the maximum angle between the viewing direction and the plane normal of the liquid crystal display. If the surface of the LCD display device is treated as a clock face, the viewing angle can be divided into four types based on the direction of the observer's line of sight: 12:00, 3:00, 6:00, and 9:00. However, the most commonly used products are those with a 6 o'clock and 12 o'clock viewing angle.
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