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 The Technology of 4 Inch LCD Display Explained


 Everything to Know About 4 Inch LCD Display

An explanation of the technology behind a typical 4 Inch LCD Display and how it works have to discuss. The lines in the screen are consist of pixels, which use liquid crystals to generate colors by manipulating parts light as per user input signals from electronics circuit boards.

When no voltage runs through them, they look black but when voltage flows across their molecules change orientation causing polarizations that appear as varying levels of brightness are between white and dark grey tones depending upon intensity levels produced at each pixel location according to different color schemes programmed into micro-electronics circuitry underneath glass plates within backlight cases for front panel viewing.

4 inch LCD display

A liquid crystal display (LCD) is an electronic device that displays images with the use of a light source and liquid crystals. This technology makes it possible for your imagination to come alive on screen!

In order to create this “magical” experience, there are four basic principles that people should follow. The first is light can be polarizing so the orientation of liquid crystals can change when an electric current passes through it. Second, once these orientations have chang by a transparent substance with electrical conductivity you will see the colors shift and display different images on your screen!

What Really Happens Within Your LCD Screen?

As the screen is powered up, white light emits from the backlight 4 Inch LCD Display. The light goes through an LGP and disperses evenly across the upper surface of the panel. A diffuser sheet further disperses it so there are no hot spots seen outside of this plate. This recycling scattered light then enters prism sheets before reaching the bottom polarizer which only allows vertical wavelengths to pass while blocking all other orientations creating an image that can view by our eyes.

After that, the liquid crystals are controlling by passing a suitable voltage via the TFT and common electrode. Liquid crystals can block white light to a variable degree, which is controlling using filters in front of each subpixel that only allows through wavelengths corresponding with its color. To control brightness, pixels are switching on or off base on their primary colors for red/green/blue combinations.

LCD Components Disassembled

In 4 Inch LCD Display, the backlight source is either an ambient light or a separate artificial light located behind or to the side of the screen. The bottom chassis protects and houses all other components together while acting as a foundation for these parts. An LED-backlit LCD display is a thin panel that emits bright light. The backlight has many purposes, but the most important is to reduce power consumption and provide vivid colors for video displays.


The key properties of LGP panels are their transparency and weather resistance. The light guide is a sheet of plastic etchesing with a pattern that reflects light in one direction, converting the source into plane form. A matrix on the bottom directs this effect for V cutting where incoming lights exit from front sides to create uniformity across an area or space.

Diffuser Sheet

A diffuser sheet is a light-blocking screen that evenly distributes and softens the LED lights on your TV, projector, or laptop. It spreads out the bright spots of LEDs to make an even square with fewer hot spots.

Prism Sheet

The light waves are recycling off-axis through the prism sheet until they exit at an optimal viewing angle. The angles of the ridges on the front surface determine whether or not it exits brighter than other parts, and if so, is sent back to be reissuing again after passing through backlighting layers.

Bottom Polarized

A polarizer is made by stretching a plastic-like material to lengthen its fibers, then dipping the material in iodine to further lengthen and organize the material's fibers into a grid of dark parallel lines that are invisible. This acts as a filter only allowing light waves with vertical orientation to pass through while the rest of the lights are blocking.

Bottom Glass Substrate

The liquid crystal is sandwiching between 2 polarizing filters at 90 degrees to each other. The Polaris light enters the back of the liquid crystal from a LED. When it's not energizing, its 'twists' by 90° so that gets blocking by the second filter. However, if there's an electric field applying then no twist occurs.

Liquid Crystal

In an LCD display, the liquid crystals that make up a pixel are naturally twisting. When no voltage is applying to them, they block light from passing through and appear black on screen.

However when placed under an electric field due to charge in between electrodes of opposite polarities (positive or negative) at each end of a thin layer containing these molecules. This causes the molecules' orientation change which results in allocating less space for photons. Thus, allowing more visible wavelengths to pass right through it resulting in as white color image appearing on screen while other areas darken giving rise to different colors depending upon electrical polarity injected into certain pixels.

Common Electrode

The transparent electrode, commonly known as the ITO. It is critical in maintaining a uniform pixel voltage across the whole LCD screen. In color screens, it is separated into three colors: red, green, and blue (RGB).

Colour Filter

A color filter creates colors for an image on 4 Inch LCD Display. The color filter is comprising of red, green, and blue pigment. It is line up with a particular subpixel within the cell. This filter is composing of a thin glass substrate and color resistance. Three patterns (red, green, blue) are formating on this substrate called subpixels; each pattern represents one pixel in 3.


The simplicity with which 4 inch LCD display can be interfaced is one of the primary reasons they have grown so popular in recent years. Although an Arduino microcontroller is using to show this capability in this application note. The same result may achieve with a number of different microcontrollers. Similarly, an Arduino microcontroller and an LCD display may use for much more than.

Real-time clocks and thermometers, for example, maybe adding to the circuit describing here. It allowing the LCD to show the current time and temperature.

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