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What distinguishes LCD screens from OLED ones?

Views: 302     Author: Wendy     Publish Time: 2023-07-14      Origin: Site


What distinguishes LCD screens from OLED ones?

LCD and OLED are the two main display technologies that compete with one another today. The Organic Light Emitting Diode Display (OLED display) is the emerging rival to the established and dominant Liquid Crystal Display (LCD). How they produce light and the colors of the shown image is the primary distinction between LCD and OLED screens. This results in the benefits and drawbacks of any technology depending on the application.

How do OLED displays work?

OLEDs function using a solid-state technology, allowing each pixel to emit light in a range of colors and intensities without the use of an extra light source or color filter. Multiple layers of very precise organic semiconductor materials that can be altered to produce light at particular wavelengths make up the light-emitting section of an OLED display. These organic layers typically have a thickness of around 100 nm. Additionally, since there is no need for a backlight, the display module can be extremely tiny.

There are numerous electron transport layers, a recombination layer, and a hole transport layer among the organic layers that start on the cathode side of the device and end there. The OLED stack-up's electron transport layers enable the passage of electrons from the cathode toward holes provided by the anode. In the film stack-up's emissive recombination layer, electrons and holes mix once more. The electrons' energy levels are relaxed as a result of this recombination, which results in an emission of light. The chemical make-up of the organic materials utilized in the recombination layer determines the wavelength of the light that is emitted. The quantity of current passing through the organic layers of the OLED determines how bright the light is. OLEDs have individual pixels that may either emit white light, which must first pass through color filters, or red, green, or blue light.

How do LCD displays work?

The individual pixels in LCD display technology modify light. A pair of polarizers and a liquid crystal display work together to form a light shutter that can either block or permit light to pass through depending on the supplied voltage.Therefore, LCD displays need an additional light source, typically from a "backlight" (an array of LEDs positioned behind or next to the LCD panel), or from reflected ambient light. By incorporating color filters into the individual pixels, LCD color can be produced. OLED displays are substantially thinner than LCD displays of equal size and resolution since they don't need the extra backlight, polarizers, or color filter components of an LCD module.

OLED Display Advantages

It is crucial, especially for battery-powered applications like mobile phones, that OLED display technology can offer advantages over LCDs in terms of power conservation. Since light is only produced at the individual pixels required to display the image, an OLED's power consumption will vary with image content and brightness. On a black background, a dark image or graphic will use significantly less power than a bright one. On the other hand, LCD backlights have to be ON for the display to work. Although it is feasible to separately manage each illumination zone to save electricity, this increased complexity is typically only used with bigger panels.

If front surface reflections are effectively managed, OLEDs can attain a substantially greater contrast ratio. An OLED pixel does not produce light if there is no electricity flowing through it. The LCD pixel's shutter effect, in comparison, does not completely block the light. A small portion of the light produced by the backlight may escape, depending on the specific LCD technology employed and the viewing angle. Dark portions of an image may be washed off by this. Limiting this light leakage to the point where the contrast of an LCD and OLED panel is perceptually equal is feasible but expensive.

LCD display Advantages

In applications where a continuous static image is required, LCDs have an advantage over OLEDs. Luminance decay, which is a function of the total amount of current that has flowed through the pixel, has an impact on the light-emitting components of OLEDs. In terms of red, green, and blue, this deterioration varies. Although the dimming effect is slight, it can be seen as an undesirable brightness change or color shift when nearby pixels are illuminated at the same time. LCDs are a better option for applications with static images or images with static elements because they don't experience this dimming effect.

The extensive range of options provided by LCD technology is another benefit. Certain trade-offs can be highly alluring depending on the application. An illustration is how much less expensive a laptop display is than a tablet display. By enabling poor image performance when viewed from the direction that is typically blocked by the keyboard, this is accomplished. When good viewing performance is needed from any angle on a tablet, even more expensive LCDs or OLEDs must be employed.

OLED Display Applications

Glucometers, thermometers, fitness trackers, professional audio equipment, Wi-Fi hotspots, radar detectors, dive computers, biometric transaction devices, and military communications equipment are just a few of the applications where OLEDs are a great choice.

They can be used to upgrade industrial equipment by adding dynamic push buttons or replacing outdated TN LCDs. They can be manufactured in many resolutions, FPC configurations, colors, and unique OLED display shapes (such as octagonal, round, etc.). They can even be converted into flexible and transparent displays. OLED display panel suppliers can provide some intriguing features for their customers because of their adaptability—things that were previously impossible with LCDs,




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