tft lcd backlight driver in stock

Now, I do not have experience with backlight, but it seems to me that their choice of a driver is far from optimal. First, MIC2289 is a booster designed to drive up to 34V diodes in series, while the display has five LEDs in parallel. Second, the chip requires external components for soft-start, while many of the alternatives have that built-in.

While looking through LED drivers at digikey I realized that this particular application falls into weird "grey area" because of the way the LEDs are connected. The majority of chips are either step-ups designed to drive series of diodes from single lithium battery in mobile applications, or step-downs designed for higher voltage sources in lighting/automotive applications.

The display datasheet says backlight should be driven by constant current 100mA and "for the reference only" implies that this would require 2.8V to 3.4V. In my case there is 3.3V available from on-board DC-DC, which falls smack-dab in that range. So, any step-up seems to be wrong, for that potential 0.1V difference. Step-downs could be OK, but I don"t know if they really necessary. There are some linear chips like BCR421U that can do the job just fine with only one external resistor, while dissipating 0.05 Watt in the worst case and supporting nice 25kHz PWM dimming.

QUESTION: Which driver topology would you recommend? Do you know of any drivers better suitable for this application and requiring minimum external components?

This breakout board is something we designed in-house to help us work with "dot-clock" 40-pin TFT displays that require the RGB pixel data to be clocked in continuously. These displays have 40-pin Flex PCB (FPC) cables and often require a boost converter for the backlight LED, which makes them annoying to breadboard. To make them breadboardable, we stuck a 40-pin FPC and a FAN5333-based backlight driver with adjustable current onto a labeled breakout board. Now you can poke and probe each pin!

The backlight driver defaults to 25mA and can boost up to 24VDC for up to 7-LED strings. Check your display datasheet for the string configuration, and short out the jumpers to increase the backlight current.

Comes with one assembled and tested PCB. Header and TFT display is not included! We have 4.3" with touchscreen and 5.0" (withandwithout touchscreen) displays in the shop that work well with this. The 4.3" tend to like 25mA backlight drive, the 5.0" look good with 50mA backlight.

We don"t have a tutorial on using this breakout or how to interface with these displays and you must have a processor that can drive the display! This is a tool designed for more advanced makers who already have a microprocessor that has dot-clock-type TFT support built in and just want a wiring assistant. You can grab the Eagle CAD files here

SAN JOSE, Calif.-Aug. 21, 2018-Automotive infotainment designers can now upgrade to bigger, higher resolution displays with greater ease, reduced cost and smaller solution size with the MAX20069 from Maxim Integrated Products, Inc. The MAX20069 provides the industry"s first solution integrating four I2C-controlled, 150mA LED backlight drivers and a four-output thin-film-transistor liquid-crystal display (TFT-LCD) bias in a single chip. The IC can reduce design footprint up to one-third compared to the closest competitor"s parts

MAX20069 supports larger screen sizes and higher resolution by providing positive analog supply voltage (PAVVD) and negative analog supply voltage (NAVDD), both of which are required for low-temperature polysilicon panels (LTPS) that deliver higher resolution and lower cost than amorphous silicon panels now currently in use. The IC also supports the high currents that next-generation displays require, with 150mA per channel in the four-channel LED driver for 8-inch or larger displays and higher resolutions. MAX20069 operates over the minus 40°C to 105°C ambient temperature range and is available in a 6mm x 6mm TQFN package.

Safety and Built-in Diagnostics: An easy-to-use I2C interface quickly pinpoints problems, directing the microcontroller to adjust to conditions or alert the driver of a failure

"Automakers are using displays to transform vehicle interiors into a futuristic digital user experience for instrument clusters, center stacks, heads-up displays, eMirrors and other functions," said Kevin Anderson, senior analyst, Power IC Research at IHS Markit. "We forecast that shipments of automotive panels will increase by 12 percent this year to reach 165 million units. Maxim"s integrated TFT-LCD bias and LED backlight driver aligns with the growth trends in this category. Anything that helps designers to lower cost, save design space or enhance safety will draw interest."

"Automotive manufacturers are using more screens, larger panels and brighter displays across several vehicle lines to support a safer and more engaging experience on the road," said Szukang Hsien, executive business manager, Automotive Business Unit, Maxim Integrated. "Maxim"s integrated LED backlight driver and TFT-LCD bias solution supports newer panel types to help automotive manufacturers adopt lower cost yet higher resolution panels with smaller solution size and a high level of integration."

A backlight is a form of illumination used in LCD. As LCD do not produce light by itself, unlike CRT. LCD display needs illumination, ambient light or backlight, to produce image. Currently, there are two types of backlight in the market, CCFL and LED.

CCFL：Traditionally, TFT LCD used Cold Cathode Fluorescent Lamp as backlight. It was the major player in market, before LED backlight was introduced. CCFL is a mature technology, and provides stable color light source. However, CCFL backlight is relatively bulky and is not energy efficient. It is phasing out of market now.

LED:LED backlight on the other hand is small, low power consumption, has high brightness and long service time. That is why LED is taking over LCD backlight market share from CCFL.

LED, in full Light Emitting Diode, is a semiconductor diode that emits light when electric voltage is applied to it. We can separate LED backlights into two groups, based on their installation locations.

Edge-lit: LED light bulbs are affixed on the edge of TFT LCD display. A light guide plate (acrylic panel typically made from pure PMMA resin) is used to direct light out the front. Edge-lit LCD backlight can be very thin. But its efficiency is low. The thinner edge-lit backlight is, the lesser efficient it will be.

Bottom-lit: As its name states, LED light bulbs are installed evenly across the back of TFT LCD display. The advantages of bottom-lit backlight is its uniformity and brightness. But bottom-lit backlight is thicker than edge-lit, and heating could be a problem.

LED light bulbs are serially connected. When applying constant current to LED backlight, LED temperature goes up. Since supply current is not changed, voltage applied on LED backlight will drop. And LED backlight will produce even brightness.

Because of LED"s unique volt-ampere property, when supplying constant voltage to serially connected LED backlight, higher temperature leads to higher current. And higher current brings more heat. Such effect will be magnified for serial circuit. High current speeds up LED"s degradation and shortens its life span. Further more, since each LED has slightly different volt-ampere property, individual LED will have different pass-thru current. Thus, LED backlight will have uneven brightness.

Therefore, when using TFT LCD with LED backlight, engineer should apply constant current to LED backlight"s power supply, and use PWM function to control brightness.

lcd backlight driver (also known as inductive proximity sensors or proximity switches) are electrical command devices that can replace other mechanical types of switches such as limit switches, microswitches, and many others. They are able to detect metal and aluminum targets or designated positions without contact.

lcd backlight driver can be used for a number of industrial applications including in warehousing and material handling as they are able to check the position of lifting arms. Other applications include usage in heavy machinery such as forklifts, trucks, as well as the monitoring parts of hydraulic machines.

Some of the lcd backlight driver available can operate with no noise, bounce, and reaction, and are able to operate without any sensitivity to vibrations and shock. The lcd backlight driver come with the core components: coils, an oscillator, an output amplifier, as well as a Schmitt trigger. There are different versions of this sensor available, including unshielded (which allows for wider sensing distances) and shielded (with an electromagnetic field that is concentrated at the front).

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