Due to the relatively low cost, high stability, and large operating temperature range of LEDs, LEDs have become increasingly popular as backlights for LCDs in a variety of devices over the past few years, especially in handheld devices. In the field of large-screen LCD TVs, billboards and automobiles.
Market research firm iSuppli points out that the growth drivers for the solid-state lighting (SSL) product industry are shifting from small LCD backlighting applications to new applications requiring high-brightness LEDs and ultra-high-brightness LEDs. Large-screen LCDs such as LCD TVs, billboards and automotive exterior lights will be the main driving force behind the development of SSL in the electronics field.
Despite the increasing demand for new applications, optoelectronics suppliers such as Avago, Displaytech, Osram and OPTEK continue to develop thinner and smaller products for mobile devices.
Avago Technologies claims to offer the industry's thinnest surface mount LEDs in a 0603 package, enabling mobile device designers to develop smaller, thinner mobile phones, handheld game consoles and more. The LED size is only 1.6 (length) x 0.8 (width) x 0.25 mm (height).
These low-power LEDs are only the size of a pencil tip and provide superior illumination with minimal current consumption. In addition, the company's best-emitting LEDs can replace electroluminescent (EL) backlights, eliminating the need for high voltages and high-frequency electrical noise.
Avago These ChipLEDs are available in blue and phosphor white, two of the most popular colors for mobile phone manufacturers. Its ultra-thin HSMR-CL25 (blue) and HSMW-CL25 (white) LEDs are ideal for backlit keyboards and status indicators in the thinnest handsets, as well as office automation equipment and consumer electronics.
The lead-free architecture of the HSMx-CL25 lead-free ChipLED series allows heat to be diverted from the LED, allowing it to operate over a wide temperature range of -40 °C to 85 °C.
OSRAM Opto Semiconductors' new generation of side-emitting MicroSIDE LED series is also oriented to small screen LCDs, but with a smaller form factor and a height of only 0.6mm, which is 0.2mm lower than the company's previous products, and its brightness is also better than previous products. 30% higher. Due to the development of thin film technology, a single MicroSIDE LED is now capable of emitting 1.6 cd of light, higher than the previous 0.9 cd, making it suitable for a variety of small LCD backlight applications.
A complete line of RGB LEDs developed by OPTEK Technology can be used in a range of backlight applications, from automotive lighting to portable devices. The LEDs are available in a variety of sizes and viewing angles and are available in full color surface mount devices that include flat or hemispherical LED modules.
OPTEK's RGB Series LEDs can be used in cell phones, pagers, automotive interior and exterior lights, indoor and outdoor billboards and displays, telecommunication equipment, camera flash lamps, and as flat-panel backlights for liquid crystal displays, membrane switches and markers. Operating temperatures range from -40 °C to 100 °C, -30 °C to 80 °C, and -30 °C to 85 °C.
Displaytech also offers a range of RGB LEDs for handheld devices that consume as little as 60 mA - 120 mA and operate at 3.2V. Designed for the company's COG LCD, the LEDs are available in red, green and blue colors and can be used individually or in combination to create a purple, yellow, blue-green and white background color. Can be designed according to user requirements.
In the case of medium-sized applications, a white LED from Global Lighting Technologies is used in a 7-inch TFT LCD using the company's MicroLens die-guide technology to provide a smaller number of LEDs. Higher brightness reduces the number and cost of LEDs.
These GLT high-brightness, fully integrated LEDs provide 3,500 to 8,000 cd/m2 of brightness depending on the number of LEDs, and a medium-sized LCD display for perfect consistency in a variety of applications, including portable DVD, automotive GPS and DVD systems. Other daylight-readable displays in cars and vans.
Vishay Intertechnology's VLM series of high-density surface mount LEDs can be used for backlighting of larger LCDs, a RoHS-compatible version of its existing TLM series of LEDs. VLM Series LEDs can be used as backlights for automotive dashboards, car broadcasts and switches, and can be used as indicators and backlights in telecommunications systems, A/V equipment and office equipment, as well as flat backlights in LCDs, switches and markers. .
The RoHS-compliant VLM series LEDs and TLM series have the same functions and are compatible with lead-free reflow soldering in accordance with JEDEC-STD-020b and CECC 00802 standards. These can replace the TLM type LED MiniLED (50 mcd), PLCC-2 (240 mcd) and PLCC-4 (1250 mcd) models to meet the lead-free package requirements.
1
Sunhe Lighting Co., Ltd , http://www.dgledlight.com