Possibility to define a huge number of microelements
No proportional increase of calculation time as the number of microelements increases
Overview of the backlight. A huge number of microelements called "microlens array" (MLA) is formed on the top face of the light guide plate (LGP) to control its output luminance. One corner of the LGP has an LED as a light source. A reflection sheet exists below the bottom face. Side and the bottom faces are covered with a case.
Microlenses lie on concentric circles whose centers coincide with the light source position*1. Simulation of 1, 5 and 10 million microelements is performed. In order to control the distribution of output luminance, each lens is transformed according to its position.
Shape of a microlens. Its geometry is not simple as several curved surfaces form its complex comb-like shape. Each microlens can be scaled in three directions and rotated around the Z axis.
Relation between calculation time and achieved accuracy. The graph shows that just 10 minutes of calculation gives the result sufficient for initial evaluation. Note that the calculation time does not change much along with the increased number of microlenses.
Result of the simulation. 10 millions microlenses are formed and calculation is performed for 1 hour. The image shows luminance distribution. Each luminance range is colored differently in the image. A conventional PC was used for calculation.
(upper right) Initial luminance distribution on the output surface
(lower left) Final luminance distribution after the design
Overview of the backlight. A huge number of microelements called "microlens array" (MLA) is formed on the top face of the light guide plate (LGP) to control its output luminance. One corner of the LGP has an LED as a light source. A reflection sheet exists below the bottom face. Side and the bottom faces are covered with a case.
Microlenses lie on concentric circles whose centers coincide with the light source position*1. Simulation of 1, 5 and 10 million microelements is performed. In order to control the distribution of output luminance, each lens is transformed according to its position.
Shape of a microlens. Its geometry is not simple as several curved surfaces form its complex comb-like shape. Each microlens can be scaled in three directions and rotated around the Z axis.
Relation between calculation time and achieved accuracy. The graph shows that just 10 minutes of calculation gives the result sufficient for initial evaluation. Note that the calculation time does not change much along with the increased number of microlenses.
Result of the simulation. 10 millions microlenses are formed and calculation is performed for 1 hour. The image shows luminance distribution. Each luminance range is colored differently in the image. A conventional PC was used for calculation.