COMMON VOLTAGE DISTORTION DETECTION CIRCUIT, LIQUID CRYSTAL DISPLAY DEVICE AND METHOD OF DRIVING THE SAME

• Main Authors: KIM, YUN NAM, CHOI, HYONG DO
• Format: Patent
• Language: English; Korean
• Published: 17.02.2016
• Subjects: ADVERTISING; ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION; CRYPTOGRAPHY; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; DISPLAY; EDUCATION; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; SEALS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

Disclosed are a common voltage distortion detection circuit which can modify an inversion method in real time by monitoring distortion of common voltage, a liquid crystal display device having the same, and a driving method thereof. The common voltage distortion detection circuit comprises: a current detection unit, a voltage difference detection unit, and a comparator. The current detection unit is arranged between a common voltage apply unit for generating common voltage applied to a liquid crystal panel, and an input power terminal for supplying power to the common voltage apply unit, and converting a current level corresponding to input power applied to the common voltage apply unit into voltage. The voltage difference detection unit outputs difference voltage by detecting the voltage difference between both ends of the current detection unit. The comparator outputs an overcurrent signal for requesting to change the inversion method of the liquid crystal panel if the difference voltage is greater than reference voltage by comparing the difference voltage and the reference voltage. 공통전압의 왜곡을 모니터링하여 액정표시패널의 반전방식을 실시간으로 변경할 수 있는 공통전압 왜곡 검출 회로, 이를 갖는 액정표시장치 및 이의 구동 방법이 개시된다. 공통전압 왜곡 검출 회로는 전류 검출부, 전압차 검출부 및 비교기를 포함한다. 전류 검출부는 액정표시패널에 인가되는 공통전압을 생성하는 공통전압 인가부와 공통전압 인가부에 전원을 공급하는 입력전원단 사이에 배치되어 공통전압 인가부에 인가되는 입력전원에 대응하는 전류의 크기를 전압으로 변환한다. 전압차 검출부는 전류 검출부의 양단 사이의 전압차를 검출하여 차전압을 출력한다. 비교기는 차저압과 기준전압을 비교하여 차전압이 기준전압보다 크면 액정표시패널의 반전방식을 변경하도록 요청하는 과전류 신호를 출력한다.