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ANSYS 2019 R3

How Simulation can Optimize an LCD Screen’s LED Backlight

LCD screen simulation shows that they don’t work without a proper backlight.

Without a proper backlight, liquid crystal displays (LCDs) become an expensive paperweight.

This is why most LCD screens are lit up by light-emitting diodes (LEDs). Ensuring that these LED backlights uniformly brighten an LCD screen is a challenge for engineers.

The LED backlights are positioned at the edge of the screen to keep from adding to its thickness. The problem is that light entering at the edge of the screen will want to pass through it instead of dissipating evenly over the screen’s surface.

Using ANSYS SPEOS, engineers can design a backplate that changes the direction of the light, so it properly brightens the LCD screen.

Optimizing an LCD Screen’s LED Backlight with ANSYS SPEOS

An LCD backplate is designed to have millions of micro shapes on its surface topography. The goal is to optimize this topography, so the LED backlight uniformly brightens the LCD screen. Traditionally, designing the backplate topography was complex and time-consuming.

Simulations of the backlight and LCD screen before (top) and after (bottom) backplate optimizations.

SPEOS, however, is able to optimize the design of the backplate topology using these variables:

  • The size of the screen.
  • The placement of LEDs.
  • The backplate’s material.
  • The backplate’s curvature.
  • The backplate’s shape.

The optimization of the backplate’s topology can also take manufacturing processes into consideration. For instance, the topology of a backplate produced by additive manufacturing will be different from one that is sculpted. Even the shape of the sculpting tool can be considered when optimizing the backplate’s topology.

Simulations of the backlight and LCD screen before (left) and after (right) backplate optimization.

SPEOS can also simulate and optimize other screens, including:

  • Mobile screens.
  • Projector screens.
  • Digital light processing (DLP) screens.
  • Organic LED (OLED) screens.

To learn more, read ANSYS SPEOS Capabilities.

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