Samsung Display Co., Ltd.

Samsung Electronics Co., Ltd.

Hwanwoong Lee

Min-Soo Choi

Won Sik Oh

Taegon Im

Eun Chul Shin

Dae-Sik Lee

Kyunho Kim

Junpyo Lee

Myoung-Soo Kim

Moonshik Kang

Jin-won Jang

Seunghwan Moon

Youngsup Kwon

Byungkil Jeon

SeungYoung Choi

Gwangteak Lee

Woojung Jung

Yongho Sung

A timing controller includes: a compensator to receive an image signal and to output a compensation image signal; a dimming range adjustor to receive a backlight dimming signal and to output a dimming range signal to adjust an active section of the backlight dimming signal; a smoothing processor to output a smoothing image signal to smooth the compensation image signal in response to the dimming range signal; and a data output part to output an image data signal by adding the smoothing image signal to the image signal.

Timing controller and display device including the same

A backlight unit includes a power converter configured to generate a light source driving voltage in response to a voltage control signal, a plurality of light emitting diode strings, where each of the light emitting diode strings receives the light source driving voltage through a first terminal thereof, a plurality of transistors corresponding to the light emitting diode strings, where each of the transistors includes: a first electrode connected to a second terminal of a corresponding light emitting diode string thereof; a second electrode; and a control electrode, and a controller connected to the control electrode and the second electrode, where the controller outputs a plurality of current control signals to control electrodes of the transistors and generate the voltage control signal, where the controller generates an over-current detection signal when any one of the current control signals has a pulse width less than a predetermined reference width.

Backlight unit with over-current detection and display device having the same

In a display device, a backlight unit including a power converter configured to generate a light source driving voltage in response to a voltage control signal, a plurality of light emitting diode strings each configured to receive the light source driving voltage through an end thereof, and a controller connected to the other end of each of the plurality of light emitting diode strings and configured to generate a plurality of current control signals used to control a current flowing through each of the plurality of light emitting diode strings and the voltage control signal. The controller is configured to generate the voltage control signal in response to a current control signal from among the plurality of current control signals, which is applied to a light emitting diode string configured to receive a lowest forward driving voltage among the plurality of light emitting diode strings.

Backlight unit and display device having the same

A backlight unit includes a power supply converter including a primary winding connected to an input power supply voltage, and a secondary winding which is connected to an output node and outputs a light emitting diode drive voltage to the output node in response to a mode signal and a switching control signal; and a light emitting diode string connected to the output node of the power supply converter, where the power supply converter serially connects a boosting winding to the secondary winding and the output node and when the mode signal represents a three dimensional image display mode, and outputs a boosted light emitting diode drive voltage to the output node through the boosting winding.

Backlight unit and display device including the same

A backlight assembly outputs scan signals having a scanning frequency synchronized with a frame frequency to sequentially drive light emitting blocks providing a light to a display panel. A dimming step of each light emitting block corresponds to one of a plurality of dimming steps in response to local dimming data. A dimming clock having a value obtained by dividing a value obtained by multiplying the scanning frequency and the number is dimming steps by a duty ratio of each scan signal is generated. The dimming step of each light emitting block is counted using the dimming clock, and the counted values are combined with the scan signals to generate dimming signals having a dimming duty ratio corresponding to the dimming step of the light emitting blocks.

Method of driving backlight assembly and display apparatus having the same

A backlight unit includes light source groups, a converter, a compensator, a detector and a protector. Each of the light source groups includes a light source, and the converter boosts an input voltage to a driving voltage that is supplied to the light source groups. The compensator is connected to the light source groups and compensates a deviation between currents fed back to the compensator from each of the light source groups. The detector is connected between the compensator and the light source groups and detects a maximum voltage from among feedback voltages fed back to the compensator from each of the light source groups. The protector is connected to the detector and receives the maximum voltage, and compares the maximum voltage to a reference voltage to generate a compared result. The protector outputs a protection signal to the converter based on the compared result.

Backlight unit, display apparatus having the same and method of inspecting the same

Growing community of inventors

Asan-si, South Korea

Hwanwoong Lee