Backlighting Membrane Switches mean that there is a light source from the backside to light the graphic overlay and provide the indication information to users. When the product is used in the night or dark environment it can light the graphic and make the users or workers make buttons press operation correctly and avoid pressing wrong buttons.
There are several types of backlighting ways for the membrane switches
Fiber backlighting membrane switches (are seldom used nowadays due to their complex manufacturing process and very high cost. It has been replaced by EL lamp backlighting and LGF backlighting technology
LED Backlighting Effective
For the LED backlighting effective, the graphic overlay is lighted by the backside LEDs assembled on the flex or rigid circuit layer. In this way, it is very simple and also economical.
But it couldn’t get an even lighting effect on the surface. For this backlighting method, the LEDs can be assembled under centered buttons and also can be assembled beside the buttons or other areas. The products that need each button to be backlighted, usually design the LEDs under the center of the buttons, then use the center-holed metal domes and print transparent color on the graphic overlay.
In this way, the center button will be much brighter than the sides of it. But this way is easy to achieve and also its cost is the lowest. This is suitable for those products with no very high requirement for the evenness of the backlighting.
EL Lamp Backlighting Membrane Effective
For the EL lamp backlighting membrane effective, the graphic overlay will be backlighted by the EL lamp layer under the overlay. EL( Electroluminescence)：
Electroluminescence means luminescence produced by high energy generated from electrons which are accelerated within phosphors when an alternating current is applied to a luminous layer consisting of phosphor powder.
EL lamp’s light is very even and the manufacturing process is also simple. But the end-users need to design an additional connection port for the EL lamp layer.
Also, this kind of backlighting keypad needs another driver to match the EL lamp in the keypad. We can provide the EL driver to match our EL lamp backlighting membrane keypads.
LGF backlighting membrane Effective
The LGF backlighting membrane effective, it is the current most popular backlighting technology. LGF is a light guide film. LGF itself is not a light source. It couldn’t produce light. It still needs the LEDs assembled on the circuit layer to produce the light source.
But LGF can guide the light from the LEDs to the top overlay evenly. This backlighting keypad can save the LEDs quantity and it also can get an even backlighting effect with fewer LEDs.
But in this way, the difficulty is adjusting the refraction dots on the LGF layer. Adjust the direction of dots, density, position, etc. And its tool fees are higher.
Bellow is their difference and advantages and disadvantages for your reference:
Item
LED Backlighting
EL Lamp Backlighting
LGF Backlighting
Manufacturing Difficulty Level
Easy
Easy
Difficulty
Backlighting Uniformity
Bad
Much Better
Better
Tool Cost
Low
Middle
High
Product Cost
Normal
Higher
Middle
LED backlighting
El background
translucent emboss
LGF backlighting
Membrane switches operate all sorts of products,from household appliances to industrial and medical equipment.Manufacturer produces quality membrane switches and touchscreen panels in a variety of sizes,designs, and functions. Please visit our factory and see how things operate here!
LuphiTouch,a professional OEM manufacturer of user interface subassembly products.LuphiTouch is located in south of China in Dongguan,and since 2008 the core of its business is manufacturing an export of membrane switches & keypads, capacitive switches, silicone Rubbert keypads, graphic overlays, and touchscreen panels. Besides,they also offer mechanical design and PCBA development, as well as development of single-chip solutions, Keypad Backlighting Solutions, and turnkey assembly.
The production of high-tech interface products requires clean and well functioning operations.let's get to know that how LuPhi complies with industry requirements.
The factory has many strengths-we use high quality imported raw materials and have a skillful team of workers,as well as modern production and testing equipment,our facility is certified with ISO 9001,medical ISO13485,environmental ISO14001,health and safety ISO45001, and the production areas are equipped with 10000 and 1000 class cleanrooms.our products obtain main quality certificates for major markets, such as Europe,North America and Australia.
80% customers of LuphiTouch are from USA, Australia, UK, Germany, Austria, France, Italy, Belgium, Sweden, Newzealand etc. countries and areas. We've established good cooperation relations with them already.
