Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2006-01-03
2009-10-13
Hjerpe, Richard (Department: 2629)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S100000, C345S098000, C345S204000
Reexamination Certificate
active
07602372
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.
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Bushnell , Esq. Robert E.
Hjerpe Richard
Samsung Mobile Display Co., Ltd.
Tryder Gregory J
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