Calculating Pixel Size in LCD Displays

When determining the pixel size in a standard format liquid crystal display (LCD), several factors such as screen size, aspect ratio, and resolution come into play. Here’s how you can calculate the pixel size and sub-pixel size:

Pixel Size Calculation

1. Understanding Pixel Composition: In LCD displays, each pixel typically consists of three sub-pixels arranged in a square configuration (AxA). The sub-pixels are uniform in size, with the short side being one-third of the long side (A/3).

2. Given Parameters:

• Screen Size: Diagonal measurement of the display in inches.

• Aspect Ratio: Ratio of the width to the height of the display.

• Resolution: Number of pixels horizontally (H) and vertically (V).

3. Calculating Pixel Dimensions:

• Determine the physical dimensions of the display using the aspect ratio and screen size.

• Calculate the pixel pitch (distance between two adjacent pixels) using the formula:

Pixel Pitch Calculator

Here, 25.4 converts inches to millimeters.

• Determine the pixel size by dividing the pixel pitch by the square root of 3 (since each pixel is composed of three sub-pixels).

4. Adjustment for Manufacturing Precision: Due to the precision constraints in mask production and other factors, the calculated pixel size is typically rounded to the nearest 0.25μm increment during actual panel design.

5. Reverse Calculation: Conversely, knowing the actual pixel size allows for the determination of the screen’s physical dimensions, aiding in precise panel design and production.