Things You Need To Know About Segment LCD Modules

Jan 7, 2022 | Articles

Things-you-need-to-know-about-segment-LCD-modules

Outlines:

  1. What Are The Components Of The Segment LCD Module?
  2. What Parts Of LCD Are Composed Of?
  3. What Parts Of The Backlight Are Composed Of?
  4. What Are Parts Of The PCB Board Composed Of?
  5. The Way That LCD And Backlight Combine With PCB Board
  6. What To Pay Attention To When Using The Module?
  7. Final Words

Are you looking for a segment LCD? 

Are you wondering about the things that are essential and you need to know about Segment LCD modules?

Generally speaking, the segment LCD module is composed of LCD, backlight, and PCB board.

The LCD part includes glass, liquid crystal, polariser, PIN pin, and various glues.

The backlight mainly includes LED lamp beads, light guide plate, diffusion film, shading glue and other parts.

The PCB board comprises the aluminium substrate, various types of capacitors and resistors, IC and solder points, and logic circuits.

When we produce and use LCD modules, we will encounter various problems, among which the most important points are: 

  • Ensure that the liquid crystal is not damaged by knocking; 
  • Ensure that there is no dark area in the light-emitting area of ​​the backlight; 
  • Ensure that the capacitor resistance and IC on the PCB board are soldered to the corresponding position stably.

Some points need to be paid attention to, which we will introduce in detail in the article.

Guess what You are at the right place. Here, we list things and questions you need to know about segment LCD modules. Some points need to be paid attention to, which we will introduce in detail in the article.

1. What Are The Components Of The Segment LCD Module?

A seven-segment display is electronic display equipment for presenting decimal numerals that is an option to the more complex dot matrix displays.

The segment LCD module is composed of: 

  • LCD

A liquid-crystal display (LCD) is a horizontal-panel display or electronically changed optical equipment that utilises the light-modulating characteristics of liquid crystals mixed with polarisers. 

  • Backlight

LCD creates management of visible light. In the absence of this light, we add a backlight during making LCDs for visibility. Many choices to obtain one of them are appearance vs cost. The display modules are integrated with different types of backlight. What we usually use for LCDs are LED backlights. Because it’s easy to make custom designs and easy to control the brightness, and it has lots of colour options. Usually, the backlight will be white. Orange and green, blue, red are also commonly used.

  • PCB Board

A printed circuit board (PCB) is a layered sandwich formation of conductive and insulating layers. PCBs have two complementary functions. The first is to affix electronic parts in selected locations on the outer layers applying to solder. The second is to give strong electrical connections (and reliable open circuits) between the component’s terminals in a controlled manner, often referred to as PCB design.

What-are-the-components-of-the-LCD-display?

2. What Are Parts Of LCD Composed Of?

LCDs are used in a big area of purposes, including computer monitors, aircraft cockpit displays, instrument panels, LCD televisions, and indoor and outdoor signage.

 The LCD part includes 

  • Glass 
  • Liquid crystal 
  • Polariser
  • PIN pin
  • Various glues.

Liquid crystals do not transmit light directly, instead of use a backlight or reflector to produce images in shade or monochrome. LCDs are available to display random images or fixed images with low data content, which can be displayed or stored.

What-parts-of-LCD-are-composed-of?

3. What Are Parts Of The Backlight Composed Of? 

Liquid crystals don’t release light directly. It usually will need a backlight to show the inner icons and letters. But reflective LCDs do not need a backlight. It has a reflective polariser to expose the internal icons and letters.

The backlight mainly includes LED lamp beads, a light guide plate, diffusion film, shading glue, and other parts.

An LCD backlight module usually includes: 

  • Backlight sources 
  • A light-diffusion plate 
  • A reflector 
  • A brightness enhancement film (BEF)
  • A light-guide plate (LGP). 

Formally, cold cathode fluorescent lamps, also known as CCFLs, need enough backlighting for LCD panels.

What-parts-of-the-backlight-are-composed-of?

4. What Are Parts Of The PCB Board Composed Of?

Printed circuit boards (PCBs) are generally horizontal laminated composite manufactured from non-conductive substrate stuff with layers of copper circuitry occupied internally or on outer covers.

The PCB board is mainly composed of:

  • Aluminium substrate 
  • Various types of capacitors and resistors 
  • IC and solder points 
  • Logic circuits

They can be as plain as one or two layers of copper; they can have fifty or more in high-density applications.

What-parts-of-the-PCB-board-are-composed-of?

5. The Way That LCD And Backlight Combine With PCB Board 

LCD panels usually use thinly-coated metallic conductive pathways on a glass substrate to form the cell circuitry to control the panel. It is generally impossible to use soldering techniques to connect the panel to a separate copper-etched circuit board directly. Instead, interfacing is achieved using anisotropic conductive film or, for beneath densities, elastomeric connectors.

LCD has two upper and lower glass, so there is usually a crystal filling port on the left or right side, and this crystal filling port will be sealed with glue. At the same time, this mouth also needs to avoid being bumped. So generally, the backlight will add an extra 1 mm to protect the seal. In addition, the minimum shading area of the backlight is 7mm. Therefore, the size of the backlight is generally 8mm longer than that of the LCD. 

The-way-that-LCD-and-backlight-combine-with-PCB-board

6. What To Pay Attention To When Using The Module?

When we produce and use LCD modules, we will encounter various problems, among which the essential points are: 

  1. Ensure that the liquid crystal is not damaged by knocking; 
  2. Ensure that there is no dark area in the light-emitting area of the backlight; 
  3. Ensure that the capacitor resistance and IC on the PCB board are soldered to the corresponding position stably. 

What-to-pay-attention-to-when-using-the-module?

7. Final Words 

As mentioned above, the LCD comprises two upper and lower pieces of glass. If there is a pin on one side, the glass above needs to reserve 2.5mm for the pin. If it is a two-sided mounting pin, you will need to leave 2.5mm on the top and bottom for mounting the pin because 1.5mm needs to be reserved around the VA area for sealing glass glue. So let’s use an example to illustrate: For example, the VA area of LCD is 10*10mm, and the pin feet are on both sides, then the size of the small glass is 13*13mm, and the size of the large glass is 13*18mm. 

CreateXplay provides custom designs for Segment LCD and Graphic LCD Different Shapes, Different Sizes, Different Backlights.

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