Lumens Co., Ltd.

Lg Display Co., Ltd.

Samsung Electronics Co., Ltd.

Jong Il Kim

Kyung Ho Yoo

Myeong-Kook Gong

Yong-Wook Cho

Young June Lee

Seung Jong Han

Kil Ho Choo

Jae Young Oh

Seung Hee Nam

Dong Seob Jang

Jae Heon Noh

Seong Ho Youn

Chang Hyun Kim

Jong Dam Kim

Byung Duck Song

Sun Gil Kim

The purpose of the present invention is to reduce heat generated through a switching IC circuit in order to protect a switching IC circuit by connecting a resistor to an LED unit in which a plurality of LEDs are connected so as to disperse heat in the resistor when a rated voltage or more is inputted. To this end, the LED lighting device comprises: a rectification circuit unit for receiving input power from a power source unit and outputting a rectified power; an LED unit having a plurality of LED channels connected in series and a resistor unit connected to the last end of the LED channels; a current sensing resistor; and a switch circuit unit comprising a plurality of switches, wherein an nth switch is connected to the rear end of an nth LED channel so as to control an operation of the nth LED channel and is controlled by a sum of a current of the nth switch and a current of an (n+1)th switch, which flows through the current sensing resistor.

LED lighting device

A light emitting diode (LED) lighting device includes a circuit for receiving an input power from a power source and outputting a rectified power, an LED unit including a plurality of LED channels connected in series, each LED channel having a front end and a rear end, a current sensing resistor, and a switch circuit unit. The switch circuit unit includes a plurality of switches, and an Nswitch is connected to the rear end of an NLED channel so as to control an operation of the nth LED channel, and is controlled by a sum of a current of the Nswitch and a current of an (N+1)switch, which flows through the current sensing resistor. Forward voltages of the LED channels are unevenly redistributed so as to keep power consumption between the Nswitch and the (N+1)switch substantially same, and N is a positive integer.

An LED lighting device comprises: a rectification circuit unit for receiving input power from a power source unit and outputting a rectified power; an LED unit having a plurality of LED channels connected in series and a resistor unit connected to the last end of the LED channels; a current sensing resistor; and a switch circuit unit comprising a plurality of switches, wherein an nth switch is connected to the rear end of an nth LED channel so as to control an operation of the nth LED channel and is controlled by a sum of a current of the nth switch and a current of an (n+1)th switch, which flows through the current sensing resistor.

An exposure apparatus for a photosensitive film includes: light-emitting diodes for generating rays to expose a photosensitive film; a light shield positioned between the light-emitting diodes to prevent noise; a stage for receiving a substrate having the photosensitive film thereon; and a parallelizer positioned between the light-emitting diodes and the stage for redirecting the rays from the light-emitting diodes to be perpendicularly incident upon the photosensitive film.

Exposure method and exposure apparatus for photosensitive film

A display device including a plurality of light sources spaced apart from one another, a refracting plate disposed over the plurality of light sources, and first and second refracting surfaces formed at both surfaces of the refracting plate to allow light emitted from the light sources to be scattered plural times by passing through the refracting plate, the first and second refracting surfaces having different shapes from each other. With the display device, light emitted from the light sources can be uniformly diffused, whereby high brightness uniformity can be accomplished even at positions relatively close to the light source, resulting in a reduction in a thickness of the display device.

Display device having high brightness uniformity at positions close to light source

A liquid crystal display device includes a data line, a source electrode, a drain electrode, and a pixel electrode disposed on a lower substrate, an island-shaped semiconductor layer overlapping the source and drain electrodes, a gate insulating layer along an entire surface of the lower substrate including the semiconductor layer, a gate line and a gate electrode on the gate insulating layer, a passivation layer along an entire surface of the lower substrate including the gate line, an upper substrate facing the lower substrate, and a liquid crystal layer between the lower and upper substrates.

Thin film transistor device, liquid crystal display device using the same, and method of fabricating the same

A back light unit and a manufacturing method thereof capable of improving efficiency of a manufacturing process are disclosed. The back light unit includes a light source, a light guiding plate which uniformly transmits a light beam generated by the light source, and a cover portion which forms an external appearance and fixes the light guiding plate, wherein a resin material is charged between the light guiding plate and the cover portion to couple the light guiding plate and the cover portion.

Growing community of inventors

Gyeonggi-do, South Korea

Jong Il Kim