Pattern optimization in a light guide plate and positioning of light sources for improving the optical characteristics of large-area, flat-type lighting systems

Study on light guide plate design technology for improving optical efficiency of flat-type lighting device

“…Therefore, adopting an optimal pattern to improve the optical efficiency characteristics of the LGP of a device is an important design measure. Based on the results of previous studies, 21 – 26 , 29 the V-groove pattern size used in the simulation was designed to have a width and depth of 0.5 mm. This was similar to the ratio of the pattern size processed in the LPG using an actual laser, i.e., 504×545 μm (width × depth).…”

“…The trend of the light loss inside the LGP was identified for 10 models, in which the viewing angle was varied to induce light rays from the light source and sufficiently deliver them to the corners of the LGP. While conducting preliminary research, 21 – 26 , 29 we analyzed the results from various perspectives. Specifically, we focused on the illuminance values that varied as the viewing angle increased by 10 deg from 30 deg to 120 deg for each pattern interval.…”

“…Prior research has revealed that adjusting the processing variables of the geometric patterns and location of the light source of flat-type lighting devices play decisive roles in improving their illuminance uniformity. 23,25,29 However, adjusting the depth of some patterns to satisfy the uniformity by sufficiently transmitting the light emitted from the center of LEDs can damage the light guide plate (LGP), and the process is difficult to simplify. In addition, if the LED output is increased to prevent dark parts at the corners and center, the illuminance distribution becomes uneven, and hotspot generation in the light-incident part cannot be avoided.…”

“…Therefore, current research and development aim to adjust the emitted light of LEDs during diffusion efficiently 11 – 31 …”