Lg Display Co., Ltd.

Postech Academy-industry Foundation

Joung-Woo Lee

Mi-Seong Kim

Seung-Hee Kuk

Se-Jun Cho

Kyung-Min Lee

Jun-Hyeok Yang

Bong-Koo Kang

Chang-Hyun Sung

Ho-Young Yoon

An organic light emitting display device includes a substrate including a plurality of pixels defined thereon; a first electrode disposed at each pixel; a bank exposing the first electrode of each pixel; a spacer including, sequentially on the bank, a first layer of a first negative photoreactive acryl and a second layer of a second negative photoreactive acryl having a greater photoreactivity than a photoreactivity of the first negative photoreactive acryl, wherein the first layer has a negative taper and the second layer has a positive taper; an organic layer on the bank and the first electrode, the organic layer including an organic light emitting layer; and a second electrode on the bank, the spacer, and the organic layer.

Organic light emitting display device and method of manufacturing the same

Disclosed is an organic light-emitting diode display panel, which may effectively reduce or prevent spreading of the peeling of an organic light-emitting layer by using a bar-shaped reversed spacer, regardless of the direction in which the organic layer peels off. The organic light-emitting diode display panel may include a reversed spacer, which is disposed on a bank insulation layer having an opening and includes a reversed-trapezoidal cross section, the reversed spacer having a bar shape when viewed from the front side of the organic light-emitting diode display panel.

Organic light-emitting diode display panel

A DC-DC converter control circuit with enhanced driving efficiency while securing circuit stability during light-load driving of the DC-DC converter through variation of an on/off duty ratio of a burst mode according to load. The control circuit includes a detection unit for detecting an amount of current and a voltage at an output stage of a DC-DC converter, and generating and outputting a differential voltage according to a level of the detected voltage, a comparison unit for comparing the differential voltage with a reference voltage having a triangle or sawtooth waveform, thereby generating a duty signal, and a converter controller for generating an on/off control signal corresponding to a duty ratio of the duty signal, and supplying the on/off control signal to the DC-DC converter, to control on/off of the DC-DC converter.

DC-DC converter control circuit, image display device using the same and driving method thereof

A method and a circuit for synchronizing input and output synchronizing signals are disclosed. The method for synchronizing input and output synchronizing signals includes detecting an Nth (N is a positive integer) input period of the input synchronizing signal, determining whether the detected Nth input period is the same with a prior (N&#x2212;1) the output period of the output synchronizing signal, detecting a difference between an end time of the (N&#x2212;1)the output period and an end time of the Nth input period, if the detected Nth input period is not the same with the (N&#x2212;1)the output period, operating the detected difference with the Nth input period, and setting the operated value as an Nth output period, and generating and outputting the output synchronizing signal having the set Nth output period.

Method and circuit for synchronizing input and output synchronizing signals, backlight driver in liquid crystal display device using the same, and method for driving the backlight driver

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Seoul, South Korea

Joung-Woo Lee