Segment code LCD or segment code LCD screen is just a way for users of LCD screens to call a certain type of LCD screen, but in the LCD industry, it is generally called patterned LCD screen to distinguish it from the point. Array LCD screen, so segment LCD screen is not a very strict expression or classification.

The name of the segment code liquid crystal originated from the early application of the LCD screen, which was mainly used to replace the LED digital tube (it is composed of 7 pen segments, used to display the numbers 0-9), such as calculations Basically, the contents displayed on the devices, clocks and watches, etc. are numbers and relatively simple. Nowadays, non-dot-matrix LCD screens are generally collectively referred to as segment LCD screens.

Advantages and disadvantages of segment code LCD screen

The advantages of the segment code LCD: low requirements for the main control chip, simple software, low cost of controlling the LCD screen and main control.

Segment code LCD screen Disadvantage: the text cannot be changed

段码液晶屏的工作原理The working principle of the segment code LCD screen

TN type LCD screen usually has three modes: full transmission, semi transmission and reflection. The liquid crystal will not actively emit light, and an external light source is required. The light source of the translucent liquid crystal comes from behind the liquid crystal; the light source of the reflective liquid crystal comes from the front of the liquid crystal and is reflected by the polarizer of the liquid crystal screen to the observer's eyes; the translucent liquid crystal is between the two, and the light source comes from the rear of the liquid crystal. The light also has reflected forward light. Therefore, the full-transmission liquid crystal requires the use of a backlight, the reflectivity does not require a backlight, and the transflective liquid crystal can use a backlight or not. It is impossible to observe the display in the dark on an LCD screen that does not use a backlight.

The main parameters of the segment code LCD screen

Material: TN, HTN, STN, BTN (namely VATN), FSTN and other materials.

Display mode: positive display, negative display.

Polarizer types: fully transparent, semi-transparent, reflective.

Drive condition: It is related to the selected drive chip. For example, the commonly used HT1621 chip has a duty ratio of 1/4 DUTY and a bias ratio of 1/3 BIAS.

Connection mode: metal pin connection, conductive rubber strip connection, hot pressing paper connection, FPC flexible wire connection.

Observation angle: 6-point viewing angle, 12-point viewing angle.

Working voltage: The working voltage is usually set between 3~5V, and the LCD power consumption is about 10μA.

Working temperature: The temperature range can be set according to the working environment of the LCD, the widest temperature is about -35℃~85℃.