The new Chip Scale Packaged (Flip Chip) LED technology

With the development of LED lighting and the high demands of consumers, LED chip manufacturers are continuously improving and innovating.

The development of Chip Scale Packaged (Flip Chip or CSP) LEDs is such an innovation. A CPS is a light emitting device with no substrate, solderless cabling, small size and high optical density.

CSP, or Chip Scale Package, is defined as an LED package with a size equivalent to an LED chip, or no larger than 20%. The CSP product has integrated component features that do not require soldered wire connections, reducing thermal resistance, reducing the heat transfer path, and reducing potential sources of error.

Usually, a light emitting diode (LED) has two key components, the LED chip that emits the light and the LED package which focuses it, enables assembly into lighting products and transfers the heat away to the heat sink.

 

 

Some common examples of packaged LED with power from 0.2 Watt or less (Mid-Power LED), to 10 Watt or less (High-Power LED) or 2 to 50 Watt for Chip on Board LEDs (COB).

A mid-power LED package (left) compared to CSP LED (right). Everything except the LED chip, yellow phosphor and connection pads have been removed. This process has results in a significant reduction in scale, leading to further miniaturization of LED based lighting.

Below, some examples of Samsung CSP LEDs, with different single variations and two array types (2x2 and 3x3).

 This bare-bones approach to LED structure has two goals: lower cost and more efficient heat transfer. In theory, this can result in a CSP LED fixture with lower price and a slimmer design compared with one that uses a packaged LED.

A CSP LED also has by default a wider viewing angle, of up to 180 degrees because the phosphor is applied on the sides too (see image below). This can be very important advantage for applications such as backlight modules, replacement of traditional form factor lamps and tubes.

 

 

CSP LEDs are smaller size but feature high intensity per unit with less heat. CSP is ideal for applications like LED backlights, streetlights, ultra wide view angle modules, headlights. Some LED light manufacturers use CSP chip to replicate the size and location of the tungsten filament in a halogen bulb to create beam patterns much like halogen bulbs.

We can summarize the advantages of CSP LEDs:

• Better heat dissipation
• Higher lumen density
• No holder and alloy wire, less production processes, more reliable
• More flexible

At Lumitrips you will find the CSP LEDs from Nichia in single LED module format and as multi-LED arrays: