Hong Kong Applied Science and Technology Research Institute Company, Limited

Shou Lung Chen

Ying Liu

Chen Jung Tsai

Chen-Jung Tsai

Danding Huang

Kwan Wah Ng

Pak Hong Ng

Methods and apparatuses for backlight calibration are described. The apparatuscomprises a backlight unitcomprising a plurality of light sources, at least one photo-sensoradapted to measure the light emitted by the backlight unit, a photo-sensor controllercoupled to the photo-sensorfor controlling the photo-sensor(s), a backlight driving circuitcoupled to the light sourcesfor providing individual driving on each light source, a signal generatorcoupled to the photo-sensor controllerand the backlight driving circuitfor controlling the operation timing of photo-sensorsand each of the light sourcesuch that lighting conditions from each of the light source can be acquired, and a processing unitcoupled to the photo-sensorand the backlight driving circuitfor analyzing the measurement data from the photo-sensorsand providing an adjustment signal to the backlight driving circuitto achieve uniform lighting conditions of the backlight unit. Also described is a method comprising the steps of providing saved settings for backlight driver, providing a modified timing sequence to backlight driver and photo sensor, measuring light conditions of each individual light source or each individual group of light sources in backlight unit, comparing measurement data with predefined light conditions, calculating the adjustment required on backlight drivel to achieve desired light conditions, and saving calculated adjustment as new settings for backlight driver

Methods and apparatus for backlight calibration

Apparatuses for backlighting and manufacturing processes thereof are disclosed. There is provided a backlight module. The backlight module comprises a double-sided circuit board with thermal conducting material as one of the core layers; a plurality of light source components mounted on the first surface of the circuit board; and, a plurality of electronic components mounted on the second surface of the circuit board. The thermal conducting core layer discharges heat generated by the light source components. The circuit board has at least one window on the surface layer at the second surface to expose the thermal conducting core layer for thermal dissipation. As such, the component heights on the illuminating side of the circuit board are unified, and the reflector can be made as a smooth planar sheet to provide a more uniform backlight illumination compared to a single-side circuit board design. Further, such an arrangement reduces the complexity in manufacturing the reflector and hence the cost thereof.

Backlighting apparatus and manufacturing process

A light-emitting assembly for conditioning the light output of at least one light-emitting source for light guide coupling, comprising a lens and at least one light-emitting source, the light-emitting source having an optical output axis and the lens comprising a beam diverging portion for diverging or spreading light about the output axis, wherein the beam diverging portion of the lens is along the optical output axis and forward of the light-emitting source, and at least one beam converging portion for converging or compressing light away from the optical axis is adjacent the beam diverging portion.

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Hong Kong, China

Shou Lung Chen