KR100748500B1 - Calibration circuit of flat panel display device - Google Patents

Calibration circuit of flat panel display device Download PDF

Info

Publication number
KR100748500B1
KR100748500B1 KR1020010033545A KR20010033545A KR100748500B1 KR 100748500 B1 KR100748500 B1 KR 100748500B1 KR 1020010033545 A KR1020010033545 A KR 1020010033545A KR 20010033545 A KR20010033545 A KR 20010033545A KR 100748500 B1 KR100748500 B1 KR 100748500B1
Authority
KR
South Korea
Prior art keywords
display device
emission time
light emission
organic electroluminescent
flat panel
Prior art date
Application number
KR1020010033545A
Other languages
Korean (ko)
Other versions
KR20020095352A (en
Inventor
장성진
Original Assignee
엘지전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to KR1020010033545A priority Critical patent/KR100748500B1/en
Priority to US10/080,352 priority patent/US6795045B2/en
Publication of KR20020095352A publication Critical patent/KR20020095352A/en
Application granted granted Critical
Publication of KR100748500B1 publication Critical patent/KR100748500B1/en

Links

Images

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3216—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using a passive matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness

Abstract

본 발명은 평판 표시소자의 구동회로에 관한 것으로, 종래에는 평판 표시소자 구동회로의 패널 의존성에 의해 개별 유기 전계발광 표시소자의 밝기편차가 발생되는 문제점이 있으며, 이를 방지하기 위해서는 패널의 특성에 따른 개별적인 구동회로를 사용하여야 하지만, 일반적인 경우 회로의 설계는 집적화된 반도체 칩을 제작하는 것을 의미하므로, 일괄 제작이 불가능하여 제작이 까다롭고, 제조비용을 상승시키는 요인이 되고 있다. 또한, 상기 개별적인 구동회로를 사용할 경우에도 밝기편차가 발생한 경우에는 회로를 다시 설계하여야 하는 문제점이 있었다. 따라서, 본 발명은 유기 전계발광 표시소자의 패널에 정전류를 공급하는 전류구동부와; 상기 개별 유기 전계발광 표시소자 각각의 발광시간을 검출하는 발광시간 검출부와; 상기 발광시간 검출부로부터 개별 유기 전계발광 표시소자 각각의 발광시간을 입력받아 상기 전류구동부를 제어함으로써, 개별 유기 전계발광 표시소자 각각의 발광시간을 제어하는 디지털 신호처리부를 구비하여 구성되는 평판 표시소자의 구동회로를 제공함으로써, 하나의 설계된 회로를 사용하여 특성이 각각 다른 다수의 패널을 구동할 수 있을 뿐만 아니라 회로를 재설계할 필요가 없어지므로, 평판 표시소자의 구동회로에 대한 개발비용을 대폭적으로 줄일 수 있는 효과가 있다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving circuit of a flat panel display device. In the related art, there is a problem in that brightness deviations of individual organic electroluminescent display devices are caused by panel dependence of the flat panel display device driving circuit. Although individual drive circuits should be used, in general, the design of a circuit means fabricating an integrated semiconductor chip, and thus, it is difficult to manufacture a batch and is a factor that increases manufacturing costs. In addition, even when the individual driving circuit is used, there is a problem that the circuit must be redesigned when a brightness deviation occurs. Accordingly, the present invention includes a current driver for supplying a constant current to the panel of the organic electroluminescent display; A light emission time detector for detecting a light emission time of each of the individual organic light emitting display elements; A flat panel display device comprising a digital signal processor for controlling the light emission time of each organic light emitting display device by receiving the light emission time of each individual organic light emitting display device from the light emission time detector. By providing a driving circuit, it is possible to drive a large number of panels having different characteristics using a single designed circuit and to eliminate the need for redesigning the circuit, thereby greatly reducing the development cost of the driving circuit of the flat panel display element. There is an effect that can be reduced.

Description

평판 표시소자의 구동회로{CALIBRATION CIRCUIT OF FLAT PANEL DISPLAY DEVICE}CALIBRATION CIRCUIT OF FLAT PANEL DISPLAY DEVICE

도1은 일반적인 단위 유기 전계발광 표시소자의 구동회로도.1 is a driving circuit diagram of a general unit organic electroluminescent display device.

도2는 도1에 있어서, 전계발광 표시소자에 공급되는 정전류와 유기 전계발광 표시소자의 양단간 전압의 시간에 따른 그래프도.FIG. 2 is a graph of the constant current supplied to the electroluminescent display device and the time-dependent voltage of the organic electroluminescent display device.

도3은 도1에 있어서, 발광이 종료되는 시간에서 개별 유기 전계발광 표시소자의 밝기편차를 보인 그래프도.3 is a graph showing the brightness deviation of individual organic electroluminescent display elements at the time when light emission ends in FIG.

도4는 본 발명의 일 실시예를 보인 블록구성도.Figure 4 is a block diagram showing an embodiment of the present invention.

도5는 도4에 있어서, 발광시간 검출부의 상세 예시도.FIG. 5 is a detailed illustration of a light emission time detector in FIG. 4; FIG.

도6은 도5에 있어서, 비교기의 출력 제어전압을 보인 그래프도.FIG. 6 is a graph showing the output control voltage of the comparator in FIG. 5; FIG.

도7은 본 발명에 의해 개별 유기 전계발광 표시소자가 일정한 밝기를 갖도록 발광 종료시점을 제어한 예를 보인 그래프도.7 is a graph showing an example in which the end point of light emission is controlled so that an individual organic electroluminescent display device has a constant brightness according to the present invention;

***도면의 주요부분에 대한 부호의 설명****** Explanation of symbols for main parts of drawing ***

11:유기 전계발광 표시소자의 패널 12:전류구동부11: Panel 12 of organic electroluminescent display element: current driver

13:발광시간 검출부 14:디지털 신호처리부13: Light emitting time detector 14: Digital signal processor

본 발명은 평판 표시소자의 구동회로에 관한 것으로, 특히 유기(organic) 전계발광(electroluminescent) 표시소자의 패널 특성에 따른 밝기 편차를 보상하기에 적당하도록 한 평판 표시소자의 구동회로에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving circuit of a flat panel display device, and more particularly, to a driving circuit of a flat panel display device suitable for compensating for brightness variations due to panel characteristics of an organic electroluminescent display device.

종래 평판 표시소자의 구동회로를 첨부한 도면을 일 예로 하여 상세히 설명하면 다음과 같다.Referring to the accompanying drawings a driving circuit of a conventional flat panel display as an example in detail as follows.

도1은 일반적인 단위 유기 전계발광 표시소자의 구동회로도로서, 이에 도시한 바와같이 유기 전계발광 표시소자(1)에 정전류(IO)를 공급하는 전류구동부(2)와; 상기 전류구동부(2)로부터 유기 전계발광 표시소자(1)에 공급되는 정전류를 스위칭시키는 스위치부(3)로 구성된다.1 is a driving circuit diagram of a general unit organic electroluminescent display device, and as shown therein, a current driver 2 for supplying a constant current I 0 to the organic electroluminescent display device 1; The switch unit 3 is configured to switch the constant current supplied from the current driver 2 to the organic electroluminescent display device 1.

한편, 도2는 상기 유기 전계발광 표시소자(1)에 공급되는 정전류(IEL)와 유기 전계발광 표시소자(1)의 양단간 전압(VEL)의 시간(T)에 따른 그래프도이다. 이때, Ith와 Vth는 각각 유기 전계발광 표시소자(1)가 발광하게 되는 임계값을 나타낸다.FIG. 2 is a graph showing the time T of the constant current I EL supplied to the organic electroluminescent display 1 and the voltage V EL between both ends of the organic electroluminescent display 1. At this time, Ith and Vth represent thresholds at which the organic electroluminescent display 1 emits light, respectively.

상기한 바와같은 종래 유기 전계발광 표시소자의 구동회로는 스위치부(3)가 △d의 시간동안 턴온되어 전류구동부(2)에서 정전류(IEL)가 유기 전계발광 표시소자(1)에 공급됨으로써, 유기 전계발광 표시소자(1)의 양단간 전압(VEL)이 증 가하게 되고, 그 전압(VEL)이 임계값을 넘어서면, 유기 전계발광 표시소자(1)가 발광하게 된다.In the driving circuit of the conventional organic electroluminescent display device as described above, the switch unit 3 is turned on for a period of Δd so that the constant current I EL is supplied to the organic electroluminescent display device 1 from the current driver 2. When the voltage V EL between the both ends of the organic electroluminescent display element 1 increases, and the voltage V EL exceeds the threshold, the organic electroluminescent display element 1 emits light.

이때, 유기 전계발광 표시소자(1)에서 발광되는 빛의 밝기는 유기 전계발광 표시소자(1)에 공급되는 전류의 크기와 시간에 의해 결정된다.In this case, the brightness of light emitted from the organic electroluminescent display 1 is determined by the magnitude and time of the current supplied to the organic electroluminescent display 1.

따라서, 일정한 밝기의 빛을 발생시키기 위해서는 상기 유기 전계발광 표시소자(1)에 공급되는 전류의 크기와 시간을 일정하게 하여야 하지만, 일반적으로 유기 전계발광 표시소자(1)의 발광 특성이 패널에 따라 달라지기 때문에 정해진 크기와 시간동안 일정하게 전류를 공급하더라도 일정한 밝기의 빛을 발생시킬 수 없다.Therefore, in order to generate light having a constant brightness, the magnitude and time of the current supplied to the organic electroluminescent display 1 should be constant, but in general, the emission characteristics of the organic electroluminescent display 1 depend on the panel. Because of the change, even if a constant current is supplied for a predetermined size and time, it cannot generate light of a constant brightness.

즉, 도3의 그래프도에 도시한 바와같이 발광이 종료되는 시간(Te)에서 유기 전계발광 표시소자에 따른 밝기편차가 발생함을 알 수 있다.That is, as shown in the graph of FIG. 3, it can be seen that a brightness deviation occurs according to the organic light emitting display device at the time Te is emitted.

상기의 밝기편차는 패널 의존적인 회로에 의해 발생되는 것으로, 이를 방지하기 위해서는 패널의 특성에 따른 개별적인 구동회로를 사용하여야 하지만, 일반적인 경우 회로의 설계는 집적화된 반도체 칩을 제작하는 것을 의미하므로, 일괄 제작이 불가능하여 제작이 까다롭고, 제조비용을 상승시키는 요인이 되고 있다.The brightness deviation is caused by panel-dependent circuits. In order to prevent this, individual driving circuits have to be used according to the characteristics of panels. However, in general, circuit design means fabricating integrated semiconductor chips. It is difficult to manufacture due to the impossibility of manufacturing, and it is a factor which raises manufacturing cost.

또한, 상기 개별적인 구동회로를 사용할 경우에도 밝기편차가 발생한 경우에는 회로를 다시 설계하여야 하는 문제점이 있다.In addition, even when the individual driving circuit is used, there is a problem that the circuit must be redesigned when the brightness deviation occurs.

따라서, 본 발명은 상기한 바와같은 종래의 문제점을 해결하기 위하여 창안한 것으로, 본 발명의 목적은 유기 전계발광 표시소자의 패널 특성에 따른 밝기편차를 보상할 수 있는 평판 표시소자의 구동회로를 제공하는데 있다.Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a driving circuit of a flat panel display device capable of compensating for brightness variations due to panel characteristics of an organic electroluminescent display device. It is.

상기한 바와같은 본 발명의 목적을 달성하기 위한 평판 표시소자의 구동회로는 유기 전계발광 표시소자의 패널에 정전류를 공급하는 전류구동부와; 상기 개별 유기 전계발광 표시소자 각각의 발광시간을 검출하는 발광시간 검출부와; 상기 발광시간 검출부로부터 개별 유기 전계발광 표시소자 각각의 발광시간을 입력받아 상기 전류구동부를 제어함으로써, 개별 유기 전계발광 표시소자 각각의 발광시간을 제어하는 디지털 신호처리부를 구비하여 구성되는 것을 특징으로 한다.The driving circuit of the flat panel display device for achieving the object of the present invention as described above includes a current driver for supplying a constant current to the panel of the organic electroluminescent display device; A light emission time detector for detecting a light emission time of each of the individual organic light emitting display elements; It is characterized by comprising a digital signal processing unit for controlling the light emission time of each of the organic light emitting display device by receiving the light emission time of each of the organic light emitting display device from the light emission time detector to control the current driver. .

이때, 상기 발광시간 검출부는 상기 개별 유기 전계발광 표시소자 각각의 양단간 전압(VEL)과 유기 전계발광 표시소자 각각의 발광 임계전압(Vth)을 비교하여 그 차이에 따른 제어전압(VC)으로부터 개별 유기 전계발광 표시소자 각각의 발광시간을 검출하는 다수의 비교기로 구성되는 것을 특징으로 한다.In this case, the emission time detection unit compares the voltage V EL between each end of each of the individual organic electroluminescent display elements and the emission threshold voltage Vth of each of the organic electroluminescent display elements and separates them from the control voltage VC according to the difference. The organic electroluminescent display device is characterized by comprising a plurality of comparators for detecting the light emission time.

상기한 바와같은 본 발명에 의한 평판 표시소자의 구동회로를 첨부한 도면을 일 실시예로 하여 상세히 설명하면 다음과 같다.The driving circuit of the flat panel display device according to the present invention as described above will be described in detail with reference to an embodiment as follows.

먼저, 도4는 본 발명의 일 실시예를 보인 블록구성도로서, 이에 도시한 바와같이 유기 전계발광 표시소자의 패널(11)에 정전류를 공급하는 전류구동부(12)와; 상기 유기 전계발광 표시소자 패널(11)로부터 개별 유기 전계발광 표시소자 각각의 발광시간을 검출하는 발광시간 검출부(13)와; 상기 발광시간 검출부(13)로부터 개별 유기 전계발광 표시소자 각각의 발광시간을 입력받아 상기 전류구동부(12)를 제어함으로써, 개별 유기 전계발광 표시소자 각각의 발광시간을 제어하는 디지털 신호처리부(14)로 구성된다. First, Figure 4 is a block diagram showing an embodiment of the present invention, as shown in the current driving unit 12 for supplying a constant current to the panel 11 of the organic electroluminescent display device; An emission time detection unit 13 for detecting emission time of each of the organic electroluminescent display elements from the organic electroluminescent display element panel 11; The digital signal processor 14 controls the light emission time of each of the organic light emitting display devices by controlling the current driver 12 by receiving the light emission time of each individual organic light emitting display device from the light emission time detector 13. It consists of.                     

그리고, 도5는 단위 유기 전계발광 표시소자에 대한 상기 발광시간 검출부(13)의 상세 예시도로서, 이에 도시한 바와같이 상기 유기 전계발광 표시소자의 패널(11)로부터 단위 유기 전계발광 표시소자의 양단간 전압(VEL)과 유기 전계발광 표시소자의 발광 임계전압(Vth)을 비교하여 그 차이에 따른 제어전압(VC)을 출력하는 비교기(21)로 구성된다.FIG. 5 is a detailed illustration of the light emission time detector 13 for a unit organic electroluminescent display device. As shown in FIG. 5, the panel of the organic electroluminescent display device is used to display the unit organic electroluminescent display device. And a comparator 21 for comparing the voltage V EL between the two ends and the emission threshold voltage Vth of the organic electroluminescent display and outputting the control voltage VC according to the difference.

이하, 상기한 바와같은 본 발명에 의한 평판 표시소자의 구동회로에 대한 일 실시예의 동작을 상세히 설명한다.Hereinafter, the operation of one embodiment of the driving circuit of the flat panel display device according to the present invention as described above will be described in detail.

먼저, 도4에 도시한 바와같이 상기 전류구동부(12)에서 유기 전계발광 표시소자의 패널(11)에 정전류를 공급하면, 개별 유기 전계발광 표시소자의 양단간 전압(VEL)이 증가하게 되고, 그 전압(VEL)이 임계값을 넘어서면, 개별 유기 전계발광 표시소자가 발광하게 된다.First, as shown in FIG. 4, when the current driver 12 supplies a constant current to the panel 11 of the organic electroluminescent display, the voltage V EL between both ends of the individual organic electroluminescent display increases. When the voltage V EL exceeds the threshold, the individual organic electroluminescent display emits light.

그리고, 도5에 도시한 바와같이 상기 비교기(21)는 개별 유기 전계발광 표시소자 각각의 양단간 전압(VEL)을 정단자(+)에 입력받고, 발광 임계전압(Vth)을 부단자(-)에 입력받아 그 차이에 따른 제어전압(VC)을 출력한다.As shown in FIG. 5, the comparator 21 receives the voltage V EL between the two ends of each of the organic electroluminescent display elements to the positive terminal (+) and the emission threshold voltage Vth to the negative terminal (−). ) And outputs the control voltage VC according to the difference.

따라서, 비교기(21)의 출력 제어전압(VC)은 도6의 그래프도에 도시한 바와같이 개별 유기 전계발광 표시소자 각각의 발광이 시작되는 시간(Ti)에 상승에지를 갖고, 발광이 끝나는 시간(Te)에 하강에지를 갖는 펄스형태의 제어전압(VC)이 출력되며, 이때 출력되는 제어전압(VC)의 펄스구간이 상기 유기 전계발광 표시소자 각각의 발광시간(△T)에 대한 정보가 된다. Therefore, the output control voltage VC of the comparator 21 has a rising edge at a time Ti at which light emission of each of the individual organic electroluminescent display elements starts, as shown in the graph of FIG. The control voltage VC in the form of a pulse having a falling edge is output to Te, and the pulse duration of the output control voltage VC indicates information on the emission time ΔT of each of the organic electroluminescent display elements. do.                     

상기 디지털 신호처리부(14)는 상기 발광시간 검출부(13)로부터 개별 유기 전계발광 표시소자 각각의 발광시간(△T)에 대한 정보(즉, 제어전압(VC))를 입력받아 상기 개별 유기 전계발광 표시소자 각각의 발광이 끝나는 시간(Te)을 제어할 수 있도록 전류구동부(12)로부터 개별 유기 전계발광 표시소자에 공급되는 정전류를 제어하는 제어신호를 출력함으로써, 전체 유기 전계발광 표시소자를 제어하여 유기 전계발광 표시소자의 패널(11)이 일정한 밝기의 빛을 발광할 수 있도록 한다.The digital signal processor 14 receives the information (that is, the control voltage VC) of the light emission time ΔT of each of the organic light emitting display elements from the light emission time detector 13 and receives the individual organic electroluminescence. The entire organic electroluminescent display is controlled by outputting a control signal for controlling the constant current supplied to the individual organic electroluminescent display from the current driver 12 so as to control the time Te of each display element. The panel 11 of the organic light emitting display device emits light of constant brightness.

한편, 도7은 3개 유기 전계발광 표시소자의 특성에 따른 밝기 곡선을 보인 그래프도로서, 이에 도시한 바와같이 각 유기 전계발광 표시소자의 발광이 끝나는 시간(Te1,Te2,Te3)을 제어하여 일정한 밝기의 빛이 발광되도록 한다.FIG. 7 is a graph showing brightness curves according to the characteristics of three organic electroluminescent display devices. As shown in FIG. 7, the time (Te1, Te2, Te3) at which the emission of each organic electroluminescent display device is terminated is controlled. Allow light of constant brightness to emit light.

상기한 바와같은 본 발명에 의한 평판 표시소자의 구동회로는 개별 유기 전계발광 표시소자 각각의 발광시간을 검출하여 개별 유기 전계발광 표시소자로부터 일정한 밝기의 빛이 발광되도록 제어함으로써, 하나의 설계된 회로를 사용하여 특성이 각각 다른 다수의 패널을 구동할 수 있을 뿐만 아니라 회로를 재설계할 필요가 없어지므로, 평판 표시소자의 구동회로에 대한 개발비용을 대폭적으로 줄일 수 있는 효과가 있다.The driving circuit of the flat panel display device according to the present invention as described above detects the emission time of each organic electroluminescent display device and controls the light of a constant brightness to be emitted from the individual organic electroluminescent display device, thereby controlling one designed circuit. In addition, since it is possible to drive a plurality of panels having different characteristics, and there is no need to redesign the circuit, the development cost of the driving circuit of the flat panel display device can be greatly reduced.

Claims (2)

유기 전계발광 표시소자의 패널에 정전류를 공급하는 전류구동부와; 상기 개별 유기 전계발광 표시소자 각각의 발광시간을 검출하는 발광시간 검출부와; 상기 발광시간 검출부로부터 개별 유기 전계발광 표시소자 각각의 발광시간을 입력받아 상기 전류구동부를 제어함으로써, 개별 유기 전계발광 표시소자 각각의 발광시간을 제어하는 디지털 신호처리부를 구비하여 구성되는 것을 특징으로 하는 평판 표시소자의 구동회로.A current driver for supplying a constant current to the panel of the organic electroluminescent display; A light emission time detector for detecting a light emission time of each of the individual organic light emitting display elements; And a digital signal processor for controlling the light emission time of each of the organic light emitting display elements by receiving the light emission time of each of the organic light emitting display elements from the light emission time detector. Driving circuit of flat panel display element. 제 1 항에 있어서, 상기 발광시간 검출부는 상기 개별 유기 전계발광 표시소자의 양단간 전압(VEL)과 유기 전계발광 표시소자의 발광 임계전압(Vth)을 비교하여 그 차이에 따른 제어전압(VC)으로부터 개별 유기 전계발광 표시소자의 발광시간을 검출하는 비교기로 구성되는 것을 특징으로 하는 평판 표시소자의 구동회로.The display device of claim 1, wherein the emission time detection unit compares the voltage V EL between the respective ends of the individual organic light emitting display elements and the emission threshold voltage Vth of the organic light emitting display elements, and controls the control voltage VC according to the difference. And a comparator for detecting the light emission time of each organic electroluminescent display device from the flat panel display device.
KR1020010033545A 2001-06-14 2001-06-14 Calibration circuit of flat panel display device KR100748500B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020010033545A KR100748500B1 (en) 2001-06-14 2001-06-14 Calibration circuit of flat panel display device
US10/080,352 US6795045B2 (en) 2001-06-14 2002-02-21 Driving circuit for flat panel display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020010033545A KR100748500B1 (en) 2001-06-14 2001-06-14 Calibration circuit of flat panel display device

Publications (2)

Publication Number Publication Date
KR20020095352A KR20020095352A (en) 2002-12-26
KR100748500B1 true KR100748500B1 (en) 2007-08-13

Family

ID=27709175

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020010033545A KR100748500B1 (en) 2001-06-14 2001-06-14 Calibration circuit of flat panel display device

Country Status (1)

Country Link
KR (1) KR100748500B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11501712B2 (en) 2019-03-20 2022-11-15 Samsung Display Co., Ltd. Display device and driving method of the display device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05224624A (en) * 1992-02-12 1993-09-03 Matsushita Electric Ind Co Ltd Light emitting diode display device and its lighting time synchronizing method
JPH05265399A (en) * 1992-03-23 1993-10-15 Toshiba Corp Display device
JPH11109918A (en) * 1997-10-03 1999-04-23 Futaba Corp Organic el display device
JP2000187467A (en) * 1998-12-24 2000-07-04 Stanley Electric Co Ltd Control device for lighting organic el element and its method
KR20020095349A (en) * 2001-06-14 2002-12-26 엘지전자 주식회사 Calibration circuit of flat panel display device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05224624A (en) * 1992-02-12 1993-09-03 Matsushita Electric Ind Co Ltd Light emitting diode display device and its lighting time synchronizing method
JPH05265399A (en) * 1992-03-23 1993-10-15 Toshiba Corp Display device
JPH11109918A (en) * 1997-10-03 1999-04-23 Futaba Corp Organic el display device
JP2000187467A (en) * 1998-12-24 2000-07-04 Stanley Electric Co Ltd Control device for lighting organic el element and its method
KR20020095349A (en) * 2001-06-14 2002-12-26 엘지전자 주식회사 Calibration circuit of flat panel display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11501712B2 (en) 2019-03-20 2022-11-15 Samsung Display Co., Ltd. Display device and driving method of the display device

Also Published As

Publication number Publication date
KR20020095352A (en) 2002-12-26

Similar Documents

Publication Publication Date Title
US9997559B2 (en) Optoelectronic semiconductor component
EP1532611B1 (en) Display device
EP1768093B1 (en) Light emitting device and method of driving the same
US10649509B2 (en) Display device capable of detecting whether a power cable is abnormally connected
US8222838B2 (en) Light-emitting-element driving circuit
US20050078065A1 (en) Self light emitting type display device
US20080048737A1 (en) Voltage Generating Circuit, Constant Current Circuit and Light Emitting Diode Driving Circuit
US7071905B1 (en) Active matrix display with light emitting diodes
KR101415621B1 (en) Led control circuit and method therefor
EP1313353A1 (en) Method and device for operating a light emitting diode
US20120194076A1 (en) Lighting control device
US7535023B2 (en) Display devices and power devices
JP2001298849A (en) Electric load drive apparatus
CN114708839A (en) Backlight module and display device
KR100748500B1 (en) Calibration circuit of flat panel display device
KR20140076098A (en) Back light unit and mehtod for driving the same
KR100690606B1 (en) Calibration circuit of flat panel display device
US8461777B1 (en) Protection from short cathode condition in LED driver and method therefor
US10334690B1 (en) Driving device and driving method thereof
US6795045B2 (en) Driving circuit for flat panel display device
JP2010062327A (en) Light emitting element drive circuit
KR102510375B1 (en) Display device
CN112133247A (en) Display panel
CN112585670A (en) Driving circuit, driving method thereof and display device
KR102411963B1 (en) Power supply system with current compensation

Legal Events

Date Code Title Description
N231 Notification of change of applicant
A201 Request for examination
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20120727

Year of fee payment: 6

FPAY Annual fee payment

Payment date: 20130724

Year of fee payment: 7

FPAY Annual fee payment

Payment date: 20140724

Year of fee payment: 8

FPAY Annual fee payment

Payment date: 20150724

Year of fee payment: 9

FPAY Annual fee payment

Payment date: 20160722

Year of fee payment: 10