Graphic LCD Display Module

Graphic LCD Manufacturer

Longtech offers a wide range of standard graphic LCD modules. Our graphic LCDs are available in dot matrix format of graphic resolution including 64×64, 122×32, 128×64, 128×128, 160×32, 160×100, 192×64, 192×140, 240×64, 240×128, 320×240 and etc.

Using our nearly 20 years of expertise and advanced display technologies, we can modify our existing products or develop a completely unique solution for your application. Our dedicated team will be with you at every step, ensuring a successful result.











Standard Specifications

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Custom Graphic LCD Solution


Modify your cables' length, orientation, and pinout, or add extra connections. Invest in a cable solution that is specifically made to simplify and safeguard your connections.



To choose the ideal interface for your project, choose from a large range of possibilities or consult with our specialists. To fulfill your design objectives, we can integrate 6800, SPI, I2C, RS232 and more into your display.



To suit the needs of your application, you may easily adjust any connection on your display. Our engineers can solder any type of header that your display may need, including boxed, right angle, and pin headers.



Choose from a variety of alterations to your PCB's design, size, pinout, and component arrangement to make it a perfect match for your application.


Custom LCD Solution

We have total control over the design, production, and quality control procedures for our display products. Our engineers will collaborate with you to create a prototype to validate and test your idea.

Are you looking for a unique display solution?

All You Need To Know About Graphic LCD

In addition to TN, STN, FSTN, VA types, polarizer positive and negative mode options are also included in the LCD panel technologies. Different LED backlight options are available in a range of colors, such as white, red, blue, green, amber, RGB, yellow/green, and no backlight option.

These graphic LCD displays come in viewing angles of 6:00, 12:00, 3:00, and 9:00 o’clock to satisfy the needs of customer applications. Graphic LCD modules are including different options of polarizer in reflective, transmissive or transflective types.

This article provides you with everything you need to know about graphic LCD. What you’ll learn includes the uses of graphic LCD, its parts, the mechanism behind how it works. In the later end, you can check the difference between the small factories and us.

Graphic LCDs can render intricate graphics, texts, and symbols, supporting a broad array of visual data representation.

Designed to optimize power consumption, Graphic LCDs are an excellent choice for energy-conscious applications.

Available in a range of sizes, Graphic LCDs can be selected to suit any application, from handheld devices to larger systems.

Graphic LCDs are compatible with a variety of interfaces, facilitating seamless integration into diverse systems.

Delivering high-resolution graphics at competitive price points, Graphic LCDs offer excellent value for their capabilities.

Graphic LCDs come with a variety of backlight color options, allowing for aesthetic customization to suit your application.

About Features

What Are Graphic LCD Used For?

Graphic LCD are present in almost all industries that need display. These could be the following:

  • Instrument
  • Industry Machinery Equipment
  • Electrical Home Appliances
  • Consumer Electronics
  • White Goods
  • POS System
  • Home Applications
  • Industrial Instrument
  • Automation
  • Audio/Visual Display Systems
  • Medical Devices

How To Select the Best LCD Display For Your Application

It is not easy to introduce all aspects of selecting the best LCD display, so we have prepared a lot of information on this page for you to delve into. To make sure you can find the information you want quickly, we have prepared this content directory that will jump to the corresponding location when you click on it.

Graphic LCD: Passive-Matrix Technology

To comprehend the functioning of Passive-Matrix displays, it is crucial to possess knowledge about their manufacturing process. 

Passive-Matrix displays are made up of two pieces of polarized glass. A unique polymer is put to the non-polarized side of the glass to generate grooves that run in the same direction as the polarizing film.

After that, a liquid crystal substance is applied to one of the polarized glasses’ grooved side. These grooves help the liquid crystal to align with the glass. The second piece of glass is placed on top, grooved side in, perpendicular to the first, forming a row and column pattern.

How Does Graphic LCD work?

A pixel is formed when the grooves of two pieces of polarized glass cross. By preventing light from flowing through the top piece of glass, it produces a darker region than the surrounding area. This creates the illusion of pixels being switched on or off. The orientation of the liquid crystal must be altered to prevent light from flowing through. An electric charge is required to do this.

Without an electric charge, the liquid crystal is twisted which changes the angle of the light to match the angle of the top polarized glass. This enables for the passage of light.

When an electric charge is provided, the liquid crystal untwists, but the angle of the light remains constant. As a result, the light is blocked by the top perpendicular piece of polarized glass (as seen in the photographs).

The controllers on the display determine which pixels turn on and off. These controllers are configured to convert user data into predetermined typefaces or to turn on the pixels that have been targeted.

Graphic LCD: Display Types

The display types of passive matrix LCD can be categorized into TN (Twisted Nematic), STN (Super Twisted Nematic), and FSTN (Film-compensated Super Twisted Nematic) technologies.

TN Technology

TN (Twisted Nematic) is a popular passive-matrix LCD technology used in everyday applications. The TN technology is made up of a nematic liquid crystal placed between two glass plates. When electricity is introduced to the electrodes, the liquid crystals rotate 90°.

STN Technology

STN (Super Twisted Nematic) technology has quickly established the de facto standard for the majority of passive-matrix LCDs. This technology operates on the same principles as TN screens, however it consumes less power and is often less costly. Unlike TN technology, STN technology's liquid crystals have a 210°-270° twist, allowing for a wider transition zone for gray scaling.

FSTN Technology

FSTN (Film Compensated Super Twisted Nematic) technology is ideal for applications that demand a greater contrast passive-matrix LCD. A film compensation layer is used between the STN display and the back polarizer in FSTN. This extra film improves sharpness and contrast over TN and STN technologies.

Graphic LCD: COB vs COG

COB (Chip-On-Board) and COG (Chip-On-Glass) referring to the methods of mounting the LCD driver or controller chips onto the display module.

Chip-on-Board (COB) Character LCD Module

Chip-on-Board refers to a form of IC installation that is typically found on Passive-Matrix Displays. The IC is directly attached to the display’s PCB, resulting in a small footprint. This style of IC mounting is available from Longtech as Character or Graphic displays.

Character LCDs display information as text and have pre-programmed font tables. Graphic LCDs are available in a variety of sizes and interfaces. A dot matrix pattern is used to show both text and bitmap graphics on this sort of display. Character and Graphic Chip-On-Board LCDs are available in common sizes and as STN or FSTN kinds, as well as positive or negative display modes.

  • Display information as text
  • Monochromatic 
  • More than 8 backlight color options
  • High brightness backlight
  • Positive or Negative image options
  • 4 pre-programmed font tables
  • Industry standard sizes
  • Wide operating temperatures
  • RoHS Compliant
  • Display information as text
  • Monochromatic thin designs
  • More than 8 backlight color options
  • High brightness backlight
  • Positive or Negative image options
  • 4 pre-programmed font tables
  • Industry standard sizes
  • Wide operating temperatures
  • RoHS Compliant

Chip-on-Glass (COG) Character LCD Module

Chip-on-Glass is a method of IC mounting that is suited for tiny applications. Because the IC is directly affixed to the display’s glass, no PCB is required. This style of IC mounting is available from Longtech as a Character or Graphic display.

Character LCDs display information as text and have pre-programmed font tables. Graphic LCDs are available in a variety of sizes and interfaces. To show text and bitmap pictures, this sort of display employs a dot ma trix pattern. Character and Graphic Chip-On-Glass LCDs are available in conventional sizes, STN or FSTN kinds, and positive or negative display modes.

Graphic LCD: Display Modes

Graphic LCD displays are available in two display modes: positive and negative. The mode that should be selected depends on the application for which the display will be utilized.

Positive Type

Positive type displays provide an image with dark pixels on a light background. Ambient light or a backlight can be used for this type of display and is capable of multiple background colors.

Negative Type

Positive type displays provide an image with dark pixels on a light background. Ambient light or a backlight can be used for this type of display and is capable of multiple background colors.

Graphic LCD: Light Modes


Transflective polarizers have both reflecting and transmitting capabilities and provide the maximum viewing versatility.They may be observed in direct sunshine as well as in low light circumstances when paired with a backlight.


Reflective polarizers are employed in high-light conditions or when there is insufficient electricity to run the backlight.


Transmissive LCDs always require a backlight and have the maximum display brightness. They are ideally suited for applications that do not need direct sunlight viewing.

Graphic LCD: Backlight Color Options

There are several decisions to be made when backlighting an LCD since the color of the display may affect the entire appearance, feel, and functioning of your application.

The display mode, whether STN vs. FSTN or Positive vs. Negative, will also affect the overall appearance of the display. The samples below show the vast range of backlight colors available.

RGB Backlight Display

RGB Displays use three different lighting colors into a single LCD display. This allows them to be programmed to choose between three backlight colors: red, green, and blue, or to generate a custom backlight color by combining red, green, and blue for an infinite number of color combinations.

Graphic LCD: Connection Methods

The suggested techniques for connecting the LCD screen to the driving circuit are shown in the schematics below.

Rubber Connector

The rubber connection is a material strip that is sandwiched between the glass and the PCB. The PCB holds it in place while mechanical force is used to construct it. This kind of connection is composed of an insulating layer covering a conducting substance. The conductive material lines up and links the ITO traces on the glass with the COM & SEG traces on the PCB when it is positioned between the glass and the PCB. With its extended performance lifespan, the rubber connection is perfect for any application.

Pin Connector

A metal connector called a pin connector is glued to the LCD glass and fits onto it. Every pin connection has holes that connect to the PCB and covers an ITO trace on the glass. The PCB’s plated thru-holes connect to the controller/driver’s SEG and COM lines. Solder is used to join the PCB to the pin connection. This kind of connection has a strong track record of stability and is appropriate for modest production runs.

How To Load a Custom Image To Graphic LCD

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Why Choose LCD Display From Longtech?

Diverse Product Line

With a broad array of LCD and OLED solutions, we cater to every tech requirement.

Unwavering Quality

Our products meet international standards, embodying top-tier quality and consistency.

Competitive Pricing

High quality meets affordability in our competitively priced products.


Our production is flexible and will meet your requirement of ordering varying quantities.

Exceptional Service

Our customer service team ensures a seamless, professional experience.

Trusted Partner

Clients trust us for our reliability and unwavering commitment to their success.

More Than Just an LCD Display Manufacturer

Superior in-house production ensures quality and efficiency, unlike small factories with higher defect rates.

Small Factories

Small factories often outsource production, leading to unreliable delivery and quality. A common issue is the use of off-cut materials for polarizers.

Our Advantages

We boast in-house production lines with strict quality control, ensuring superior quality and higher efficiency. We use original, standard materials for reliability.

Small Factories

Outsourced bonding leads to electro-corrosion in small factories. Without secondary and tertiary cleaning, the defect rate increases, leading to unstable delivery schedules and uncertain quality.

Our Advantages

Our self-operated production lines ensure superior quality and higher efficiency.

Small Factories

Irregular aging processes in small factories result in high defect rates and frequent product failures.

Our Advantages

Our facility includes aging rooms and plug-in wiring products, guaranteeing over 8 hours of aging for every unit.

A Few Steps of Our Production Process

There are more than 30 steps for the production process of display and here only a few typical production steps are displayed. 

Frequently Asked Questions

We have compiled the most frequently asked questions about our LCD display here for your convenience, but please feel free to contact us if you have any additional questions.

We offer detailed datasheets and technical guides for all our products. These resources provide comprehensive information to facilitate the integration of our LCDs into your design. Our expert team is also available to assist you with any specific queries or challenges you may face.

Longtech specializes in custom solutions. Our team can work closely with you to understand your unique requirements and develop a customized LCD product that perfectly fits your application.

Our LCDs come with various options for temperature range, contrast adjustment, and backlighting to ensure optimal display performance under different conditions. Our technical team can also provide guidance on how to select and configure these options based on your specific needs.

Yes, we provide libraries and sample code for most of our LCD products. These resources can help you get started quickly with programming the display for your application.

How do I diagnose and resolve issues with the LCDs?

At Longtech, quality is our top priority. We follow a strict quality control process which includes various stages of testing and inspection to ensure our products meet the highest standards.

Yes, we understand the need for testing before making a large purchase. Please contact our sales team to discuss the minimum order quantity for your chosen product.

Lead times can vary depending on the complexity of the customization and the quantity required. Our team will provide a more precise timeline once the specifications are finalized.

We have extensive experience in global shipping and can coordinate logistics to any part of the world. Our team can work with you to determine the best shipping method based on your location, budget, and timeline.

Absolutely, our commitment to our customers doesn't end after a sale. We provide ongoing technical support to ensure the successful integration and operation of our products in your application.

We stand by the quality of our products. In the unlikely event that you receive a defective product, please contact us immediately, and we will work to address and rectify the issue promptly.

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