How to Use TFT Display Modules: The Complete Guide from GUNGUN's blog

What exactly is a TFT LCD?

Let's start with the basics. What does the abbreviation TFT LCD stand for? Thick-film Transistor (TFT) and Liquid Crystal Display (LCD) are two types of electronic displays. A TFT LCD display is a flat-panel display that can be found in computer monitors, televisions, and mobile devices such as smartphones and tablets, among other applications.

What is a thin-film transistor (TFT) display?

Massive sheets of transistors, each of which can be controlled individually, are used to construct TFT displays. A TFT screen is an active-matrix screen, which means that each pixel is illuminated individually.


Advantages of using a TFT

Luminosity and clarity – TFT displays have a higher level of clarity and brightness than LCD displays. As well as being faster than an ordinary LCD, it allows for more fluid movements to be made on it.

TFT displays consume significantly more electricity than LCD displays. They are more expensive to purchase as well as to operate.

TFT displays module – critical subassemblies and components

Layer 1a: Protective glass that is rigid

We'll start with the toughened glass on the front cover. Chemistry-strengthened glass (CSG) and Gorilla GlassTM are two of the most popular options. It is available in two finishes: gloss and matte. After that, you can add static backlit images. The buttons on the cover glass are either capacitive or mechanical in nature.

Glass that has been chemically treated is dipped in an ion exchange solution. Smaller potassium molecules are replaced by larger potassium molecules, which results in a reduction in surface flaws.

Gorilla GlassTM is a type of glass that has excellent impact resistance. Smartphones and smartwatches that are widely used.

The majority of the time, glass strength is a matter of equilibrium. Protective glass manufacturers are constantly striving to develop new glass technologies in order to meet market demands and expectations. The popularity of flexible protection options is expected to increase in the future.

Layer 1b: Flexible cover glass for the first layer.

It is necessary to use a flexible cover glass to create a TFT LCD resistive touch screen that responds to pressure in order to use it. Consequently, the same material that is used for the top layer of a membrane switch can be used to construct a resistive touch screen with membrane switch functions.

What is the operation of a resistive touch screen glass layer? A resistive touch screen overlay detects touch input by measuring the amount of physical pressure applied to the screen. Two layers make up this touch screen: an exterior flexible layer on the outside and an interior glass layer on the inside. The air space between the two layers is maintained by the microdots. This layer configuration can only process single touch events, resulting in a 20%-30% reduction in display transmittance (brightness).


Touch sensor is the second layer.

PCAP screens are displayed.

They were developed long before resistive touch screens became popular, but they have recently gained in popularity as a result of the proliferation of consumer electronics such as smartphones and tablets.

Touch panels from PCAP are extremely sensitive and respond almost instantly. In this case, the screens are made of ITO, which is transparent and conducts electricity.

PCAP screens, in contrast to resistive touch displays, do not rely on mechanical pressure to function. As an alternative, they make use of the electroconductivity of the body (which is naturally conductive). As a result, PCAP screens only function when human fingers or styluses are exposed.

Tactile-resistive materials are used in the construction of tactile-resistive materials.

A resistive touch screen is made up of two layers: a glass panel and a thin film screen. They are separated by a thin metallic layer. When the user presses on the screen, the two metallic layers come into contact, resulting in an electrical current to flow through them. The controller receives the voltage change and converts it into X and Y coordinates for further processing by the computer.

Notes: It is critical to choose a touch sensor that is compatible with the requirements of your application, such as exposure to moisture or gloved hands.

Resistive touch displays are widely used in a variety of applications, including manufacturing, ATMs, kiosks, and medical equipment. The fact that resistive screens do not require exposed human skin or a capacitive stylus makes them particularly well suited for industries where gloves must be worn.

PCAP screens, on the other hand, are increasingly replacing resistive options due to their improved moisture and glove handling characteristics.

TFT display is the third layer.

The TFT display technology itself is divided into two categories: TFT IPS and TFT TN. TFT IPS is the more common of the two technologies.

When it comes to viewing angles and color conversion, many businesses prefer In-Plane Switching (IPS) displays over TFT TN displays in general. Although IPS provides better contrast, it consumes more power. In addition, this technology is more expensive: an IPS panel costs 30-50% more than a TFT TN screen, for example.

TFT IPS (Thin Film Transistor) Display


Advantages: The images are stable and clear, rather than sparkly.

Colors that are more vivid and clear, and wall mounting that is simple due to the compact design and shallow depth.

In addition to providing a greater viewing angle (170°), super-IPS panels also provide better clarity and viewing at night.

Improved battery and screen life (on smaller screens), as well as a reduction in heat release.

There are a plethora of options.

Cons: Expensive; colors do not always translate correctly or accurately; high resolutions may not always be available for personal applications; color fidelity is not always guaranteed.

TFT NT (thin-film transistor) display

Advantages include more screens, less electricity, and lower initial and ongoing costs.

Excellent response time as well as physical screen design.

Cons: insufficient viewing angles, static resolution (cannot change resolution – newer models handle this well), color accuracy of the display may not be optimal (especially for strong blacks and bright whites), and limited battery life.


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By GUNGUN
Added Feb 8

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