Abstract: A light-merging control unit applied in a backlight module. The backlight module comprises first and second light emitting units respectively driven by first and second frequencies. Light from the first and second light emitting units is merged into merged light. The light detector detects the merged light and generates a detection signal. The controller calculates the power of the first and second frequencies according to the detection signal. The controller controls the first driver to adjust the power of the first frequency and the second driver to adjust the power of the second frequency.

Abstract: The provided backlight module includes a reflection sheet, a retardation plate, a light-guide plate, a light source, and a sub-wavelength grating plate. The retardation plate is set over the reflection sheet. The light-guide plate is disposed over the retardation plate, and the surface of the light-guide plate comprises a plurality of micro-structures. The light source is set beside the light-guide plate, and the light from the light source transferring into the light-guide plate passes through one of its end and out through the micro-structures. The sub-wavelength grating plate is disposed over the light-guide plate: (i) to transmit light having a polarization oriented parallel to the rows of bars and to define a transmitted light, corresponding to the light, as P-ray, and (ii) to reflect light having a polarization oriented perpendicular to the rows of bars and to define a reflected light, corresponding to the light, as S-ray.

Abstract: A lighting system comprises a plurality of light-emitting devices of different color emissions, a plurality of current drivers delivering electric currents to the light-emitting devices in response to drive signals, and a control circuit operable to configure the drive signals in response to a difference between the light outputs from the light-emitting devices and preset light intensity references. In a control method, the drive signals are configured to adjust the respective light outputs of specific colors to the light intensity references. The color temperature of the lighting system can be thereby kept constant.