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How to Calculate the Size of a TFT Display?


Calculating the size of a Thin-Film Transistor (TFT) display is a fundamental step when choosing a display for various applications, whether it's for a smartphone, computer monitor, or any other device. Understanding the dimensions of a TFT display is crucial to ensure it fits your device's requirements and offers an optimal viewing experience. In this article, we will guide you through the process of calculating the size of a TFT display.

1. Aspect Ratio:

The aspect ratio of a display refers to the proportional relationship between its width and height. Common aspect ratios include 4:3, 16:9, and 16:10. To calculate the size of a TFT display, you need to determine the aspect ratio that suits your application.

2. Diagonal Measurement:

The size of a TFT display is typically specified by its diagonal measurement, which is the distance from one corner of the display to the opposite corner. This measurement is given in inches for most consumer displays.

3. Use the Pythagorean Theorem:

To calculate the width and height of the display, you can use the Pythagorean Theorem, which relates the diagonal measurement (D), width (W), and height (H) of a rectangle as follows:

D² = W² + H²

This formula allows you to calculate the width or height when you know the diagonal measurement and the aspect ratio. For example, if you have a 16:9 display with a 20-inch diagonal, you can calculate the width (W) and height (H) as follows:

W = D × (9 / √(9² + 16²)) H = D × (16 / √(9² + 16²))

4. Calculate the Size:

Once you've determined the width and height, you can calculate the size of the display. The formula for calculating the size in square inches (in²) is:

Size = Width × Height

Remember to use consistent units for width and height (e.g., both in inches), and the result will be in square inches.

5. Convert to Desired Units:

If you need the size in a different unit (e.g., centimeters or millimeters), you can use appropriate conversion factors to convert from square inches to the desired unit. For example, 1 square inch is approximately equal to 6.4516 square centimeters.

6. Consider Bezels:

Keep in mind that the calculated size is for the actual screen area. Displays often have bezels or frames around the active screen area, so if you need to know the overall dimensions of the display including bezels, you should add the bezel width to the width and height calculated above.


Calculating the size of a TFT display involves understanding the aspect ratio, using the Pythagorean Theorem to find the width and height, and then multiplying these dimensions to obtain the size. Make sure to consider the aspect ratio, diagonal measurement, and any bezels when selecting a TFT display for your specific application. Accurate sizing is crucial to ensure the display fits within your device and meets your visual requirements.



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