LED Anatomy, Structure of LED | Working of LED

LED Screen Works

An LED display is a flat panel display, which uses an array of light-emitting diodes as pixels for a video display. LED displays are capable of providing general illumination in addition to a visual display, as when used for stage lighting or other decorative (as opposed to informational) purposes. But mainly we don’t focus on “working of led”, I mean how it works?

The first true all-LED flat panel television screen was possibly developed, demonstrated and documented by James P. Mitchell in 1977.

In my Article I will give some details about Overall TWO Type of LED display, in later I will make another article to describe Full LED.

They are :

• AMOLED
• QLED

In this article I will write about AMOLED Display, just keep your eyes on our next publication for nexy(QLED)

AMOLED (Active-Matrix Organic Light-Emitting Diode) is a display technology used in smartwatches, mobile devices, laptops, and televisions. OLED describes a specific type of thin-film-display technology in which organic compounds form the electroluminescent material, and active matrix refers to the technology behind the addressing of pixels.

Design Anatomy:

An AMOLED display consists of an active matrix of OLED pixels generating light (luminescence) upon electrical activation that have been deposited or integrated onto a thin-film transistor (TFT) array, which functions as a series of switches to control the current flowing to each individual pixel.

Typically, this continuous current flow is controlled by at least two TFTs at each pixel (to trigger the luminescence), with one TFT to start and stop the charging of a storage capacitor and the second to provide a voltage source at the level needed to create a constant current to the pixel, thereby eliminating the need for the very high currents required for passive-matrix OLED operation.

TFT backplane technology is crucial in the fabrication of AMOLED displays. In AMOLED, the two primary TFT backplane technologies, polycrystalline silicon (poly-Si) and amorphous silicon (a-Si), are currently used offering the potential for directly fabricating the active-matrix backplanes at low temperatures (below 150 °C) onto flexible plastic substrates for producing flexible AMOLED displays.

In the market, there are approx 7 types of display available :

1. Super AMOLED
2. Super AMOLED Advanced
3. Super AMOLED Plus
4. HD Super AMOLED
5. HD Super AMOLED Plus
6. Full HD Super AMOLED
7. Quard HD Super AMOLED

Details : –

Super AMOLED: “Super AMOLED” is a marketing term created by device manufacturers for an AMOLED display with an integrated digitizer: the layer that detects touch is integrated into the screen, rather than overlaid on top of it. The display technology itself is not improved. According to Samsung, Super AMOLED reflects one-fifth as much sunlight as the first generation AMOLED

Super AMOLED Advanced: Super AMOLED Advanced is a term marketed by Motorola to describe a brighter display than Super AMOLED screens, but also a higher resolution — qHD or 960×540 for Super AMOLED Advanced than WVGA or 800×480 for Super AMOLED and 25% more energy efficient

Super AMOLED Plus: This variant of AMOLED is brighter and therefore more energy efficient than Super AMOLED displays[29] and produces a sharper, less grainy image because of the increased number of subpixels. In comparison to AMOLED and Super AMOLED displays, they are even more energy efficient and brighter.

HD Super AMOLED: HD Super AMOLED is a branding from Samsung for an HD-resolution (above 1280×720) Super AMOLED display. The first device to use it was the Samsung Galaxy Note. 

HD Super AMOLED Plus: A variant of the Samsung Galaxy S3 using TizenOS 1 was benchmarked using a non-pentile HD Super AMOLED Plus screen in 2012.

Full HD Super AMOLED: As featured on the Samsung Galaxy S4, Samsung Galaxy S5, and Samsung Galaxy Note 3, this display has a 1920×1080 resolution that is better known as 1080p. It has a color gamut of up to 97% of the Adobe RGB color space.

Quad HD Super AMOLED: Quad HD Super AMOLED technology was first used by AU Optronics in April 2014.[34] After AU Optronics released their phone which used a Quad HD Super AMOLED screen, other companies such as Samsung released phones utilizing the technology such as the Samsung Galaxy Note 4 and Samsung Galaxy Note 5 Broadband LTE-A and Samsung Galaxy S6 and S7.

Below is a mapping table of marketing terms versus resolutions and sub-pixel types. Note how the pixel density relates to choices of sub-pixel type.

Table Diagram:

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