Backlight driver circuit and liquid crystal display device having the same

Abstract

In a backlight driver circuit and a liquid crystal display (LCD) device employing the same, separate forward driving currents are applied to red (R), green (G) and blue (B) backlights, respectively, thereby overcoming the problem of brightness variation resulting from forward voltage Vf variation in a light emitting diode (LED). The LCD includes: a backlight unit provided with R, G and B backlights for emitting light toward an LCD panel in sequence; and a backlight driver for supplying driving currents and pulse width modulation (PWM) signals to the backlight unit so as to control brightness and chromaticity of the R, G and B backlights. The backlight driver includes: a driving current generator for supplying R, G and B driving currents to the respective R, G and B backlights, and for causing the respective R, G and B backlights to emit light with predetermined brightness; and a PWM signal generator for supplying R, G and B PWM signals to the R, G and B backlights, respectively, so as to adjust the chromaticity of the light emitted from the R, G and B backlights, respectively.

Dependencies are inferred from the claim text.