Difference Between TFT and QVGA

TFT (thin film transistor) and QVGA (quarter video graphics array) are two display screen technologies. While TFT is a type of technology used to make displays, QVGA is a display resolution.

TFT is a display technology that allows for high-quality images, whereas QVGA is a particular resolution used in displays that is commonly found in small devices such as mobile phones.

Read this article to find out more about TFT and QVGA and how they are different from each other.

What is TFT?

TFT is an abbreviation for thin film transistor, a form of technology used in the production of liquid crystal displays. TFT screens are made up of a matrix of tiny pixels, each controlled by a thin film transistor. The transistor functions as a switch, controlling how much light passes through the pixel.

TFT displays use liquid crystals sandwiched between two pieces of glass or plastic, with electrodes on either side. On one side, the electrodes are connected to thin-film transistors, which allow them to control the voltage applied to the liquid crystals. When a voltage is applied to liquid crystals, they twist and untwist, allowing or preventing light depending on the angle of the twist.

A TFT display's individual pixels are made up of three sub-pixels: red, green, and blue. (RGB). Each sub-pixel is controlled by its own thin-film transistor, allowing for precise control of the pixel's colour and brightness. The display can produce a wide variety of colours and shades by varying the voltage applied to each sub- pixel.

TFT technology has progressed in recent years with the introduction of in-plane switching (IPS) and other advanced variations. These innovations provide even broader viewing angles, improved colour accuracy, and higher resolution displays. TFT technology is constantly evolving and improving, making it a vital component of modern display technology.

What is QVGA?

QVGA (Quarter Video Graphics Array) is a display screen resolution. It has a resolution of 320x240 pixels, which is one-quarter of the VGA (Video Graphics Array) standard's size. (640x480 pixels).

QVGA displays use a backlight to illuminate a layer of liquid crystals, identical to other LCD displays. These liquid crystals are arranged in a grid of pixels, each of which can be controlled separately to allow or block light. Images and words can be displayed on a screen by selectively blocking light at specific pixels.

QVGA resolution has the advantage of consuming less power than higher- resolution displays. As a result, it is well-suited for usage on mobile devices where battery life is important. Lower resolution also requires less processing ability to render images and videos, which can enhance overall performance.

QVGA displays have some limitations. When reading text or images with tiny details, the lower resolution can result in a loss of detail and clarity. Furthermore, the lower pixel density may be incompatible with bigger screens, where a higher resolution is required to produce clear and sharp images.

QVGA displays have been largely replaced in recent years by higher-resolution displays such as WVGA (Wide Video Graphics Array), which offer even higher pixel density and better picture clarity. Despite this, QVGA displays are still preferred on small devices where space and resource limitations make higher resolution displays impractical.

Difference between TFT and QVGA

The following table highlights the major differences between TFT and QVGA −





TFT is a form of technology used in the production of liquid crystal displays (LCDs).

QVGA refers to a specific display screen resolution.


Range from VGA to 4K

range from 320 x 240 pixels

Density of pixel

TFT pixel density is high.

QVGA pixel density is low.

Color Representation

24-bit RGB

24-bit RGB

Refresh Rate

The refresh rate of TFT is fast.

The refresh rate of QVGA is 60 Hz.

Energy Efficient

It consumes more power compared to QVGA displays.

It consumes little power.

Used in

TFT is used in TVs and monitors.

QVGA is used in mobile phones and digital cameras.


It is limited to imaging at room temperature and in air or liquid environments.

It is limited to conductive samples and requires a conductive substrate.


In conclusion, TFT and QVGA display technology are two different aspects of display technology. TFT is a type of technology used to make liquid crystal displays, whereas QVGA is a display screen resolution that is frequently found in smaller devices.

While TFT offers better image clarity and faster refresh rates than older technologies, QVGA resolution allows for higher pixel density on smaller screens. As a result, the decision between TFT and QVGA would depend on the device's size, purpose, and intended usage.

Updated on: 17-Apr-2023


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