LED Technology continued from page 47
Individual character flashing and blinking of all characters
Scrolling function Eight brightness levels Stackable in x- and y-direction for larger display needs
Broadcom offers serial interface LED alphanumeric displays with 4, 8, and 16 characters like the 8-character, 5-mm green HCMS-3977 and the 8-character, 3.8 mm red HCMS-2912, both in plastic packages and the 4-character, 0.2 inch yellow-green HCMS-2333 in an extended temperature range glass/ceramic package. Features of these serial LED displays include: 128 ASCII, ISO 15924 Japanese Katakana script, and custom fonts
Serial interface that supports high character count displays with minimal data lines
Can interface directly with an MCU to simplify system design
Sleep mode when the equipment is on standby
64 brightness levels Stackable in x- and y-directions supporting high character-count displays LED dot matrix display
When the application requires a visual
LED display for more complex information, designers can use the LDM-6432-P3- UR-1 from Lumex Opto. This 64 x 32-pixel RGB display has a 3 mm LED pitch (Figure 6). This display includes a UART interface, USB power socket plus 1.5 A current protector, and BLE 4.0 module. Developers can use a personal computer to develop the display software. Features include: Can handle HEX or Arduino AT commands Built-in fonts and basic shapes Can run in mixed character and graphic modes
Multiple display modules can be stacked for larger displays
Can be integrated with any MCU No driver or library needed Can display animation Different languages are available on request
e-paper display and dev board Applications that benefit from an EPD can turn to the ED078KC2 from E Ink. It’s a reflective electrophoretic EPD module on an active matrix TFT substrate. It has 1404 x 1872 pixels in an active area of 7.8”. Depending on the controller, this EPD can display up to 16 levels of grey (Figure 7). Pervasive Displays offers the B3000MS044, ext3, and the B3000MS037, ext3 giant, EPD extension boards to integrate this EPD into systems. The basic ext3 kit can drive 1.54” to 12” EPDs. For large EPDs, from 9.7” and 12”, the ext3 giant is also needed. This dev platform has an onboard driving circuit to simplify the development of EPD applications. In addition, Pervasive Displays offers expansion options, several open source driving codes, design resources, and development libraries for graphic and interactive capabilities.
Summary
Figure 6: This 64 x 32-pixel RGB LED display can be used to present more complex information. (Image source: Lumex Opto)
IIoT edge devices that require an HMI can benefit from a range of compact and low- power technologies. Gesture recognition provides a way to provide commands and controls even in challenging environments. Alphanumeric LED displays are rugged, can
Figure 7: This bistable EPD has 1404 x 1872 pixels in an active area of 7.8” and features very low power consumption. (Image source: DigiKey)
be seen in high-light environments, and can be stacked to support larger information needs. LED dot matrix displays and EPDs can present more complex information. LED dot matrices can present RGB colour displays and animations, while EPDs can be used for high-contrast greyscale displays that require very little power.
www.digikey.co.uk
New water treatment units from Stanley Electric
Using Stanley proprietary optical technology developed over many years for automotive headlamps and LED components from its in-house UV LED manufacturing process, the company has incorporated UV C LED light modules inside water treatment reactors.
T start up.
STANLEY 265nm UV C LEDs are designed to have the highest performance against viruses, bacteria and chlorine resistant parthenogenic organisms. It’s well established that 265nm UV C light disinfection is effective
48 February 2024
he heart of STANLEY Electric Japan water disinfection units is the highest class 265nm UV C LED. Designed to achieve single pass water disinfection
and extend filter lifetime by reducing maintenance intervals, Stanley continues the development of a variety of disinfection products including larger flow rate UV C water treatment products.
The disinfection effect is immediate upon
against waterborne diseases and conditions caused by micro-organisms too small to be seen with the naked eye.
For large water flow rate, it’s possible for multiple modules to be installed. The configuration of high power and ultra- high power (200mW) UV LEDs are used to improve the performance of UV LED modules. Comparing to mercury lamp – the power of UV LEDs can be obtained instantly – the quartz window for each module can be made thinner, allowing customers to manage the pressure resistance inside of a reactor. Optimisation of the distribution of UV dose by rectification and light distribution technology means UV efficiency can achieve six times higher results over mercury lamps
Components in Electronics
and the reactor size can reduce installation space to 50 per cent. Running water six LED
enables achieved lifetime of L70 10,000hr
using Stanley’s
reactors are just 187mm length by 73.5mm diameter.
The LEDs are fully hermetically sealed (metal bonding on glass) preventing “sudden drop out” due to humidity effect. This
self-developed LED dies and packages. Heat dissipation with water cooling means 45,000 hr life is realizable by driving at optimum current. STANLEY water disinfection units are designed so there is no need to drain the water when replacing the light source module. STANLEY can support each application by adding power supply and control systems upon request.
www.stanley.co.jp/e/product/uvc_product/alnuv/#head www.cieonline.co.uk
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