Colour Gamut Enhancement with Remote Light Conversion Mechanism

The backlight unit spectrum of liquid crystal displays (LCD) directly affects the colour gamut. With the invention of GaN based blue light emitting diodes (LED), phosphors and quantum dots have gained considerable... [ view full abstract ]

The backlight unit spectrum of liquid crystal displays (LCD) directly affects the colour gamut. With the invention of GaN based blue light emitting diodes (LED), phosphors and quantum dots have gained considerable scientific interest due to their broad range of applications especially in lighting and display technologies. These phosphors and quantum dots are used to convert the blue light of the LEDs into white in general lighting. On the other hand, in display systems, they are used to generate red and green bands. There are different application methods such as on-chip and remote configurations of these particles. In this study, we concentrate on remote phosphor and quantum dot backlight configurations where the light conversion is done away from the chips. We use the GaN based blue LED flip-chips, since they are more efficient in terms of the light output and thermal management. Light conversion layers were placed in backlight units as a thin film for the emission of green and red bands. The composition of these layers were arranged to match the emission spectrum of the blue LEDs and the light conversion layer to the colour filters of the LCD, so that the green, blue, and red bands efficiently widens the colour space. The results were compared with the on-chip phosphor arrangements.