For many products or instrumentation, in the iteration of product updates, in order to improve the overall grade and aesthetics of their products or the pursuit of lower power consumption, most instrumentation manufacturers will replace the digital tube for segment LCD. So how to replace the LCD for segment code, what issues need to pay attention to?

Before looking at the above issues, first look at the working principle of the two.

Segment code LCD working principle

Segment code LCD is also called segment LCD, the screen consists of patterns and pen segments, the display effect is generally black on white, white on blue, white on black, etc., after power on through a single chip or driver chip control different pins to control the pen segment or pattern of light and off. The manufacturing materials are mostly composed of ITO glass, liquid crystal, Pin metal pins, polarizer and other materials.

The working principle of digital tube

Digital tube belongs to the LED lighting series, each pen segment has an LED, the display principle and segment code LCD is actually somewhat similar, but not exactly similar. The main component materials are: digital tube shell, LED lamp beads, resin, electronic components, circuit board composition.

Segment code LCD replacement digital tube process

We need to first find a segment code LCD manufacturers, to provide them with specific size and display content parameters, so that he first design segment code LCD, design and then make samples, and then installed on their own products debugging.

Segment code LCD instead of digital tube considerations

1. Need to pay attention to and solve the voltage problem, because the digital tube is using direct current, while the segment code LCD is using square wave alternating current.

2. If the LCD is driven by a microcontroller, it is necessary to see whether the pins are sufficient, if there are not enough pins, it is necessary to add a driver module.

3. Chip problem, digital tube using chips such as 74HC245, PT6965, TM1638 chips, while segment LCDs use more driver chips for HT1621 series chips.