KR20010056031A - Liquid Crystal Display Driver - Google Patents
Liquid Crystal Display Driver Download PDFInfo
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- KR20010056031A KR20010056031A KR1019990057426A KR19990057426A KR20010056031A KR 20010056031 A KR20010056031 A KR 20010056031A KR 1019990057426 A KR1019990057426 A KR 1019990057426A KR 19990057426 A KR19990057426 A KR 19990057426A KR 20010056031 A KR20010056031 A KR 20010056031A
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- 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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
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- 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
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/041—Temperature compensation
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- Computer Hardware Design (AREA)
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- Liquid Crystal Display Device Control (AREA)
Abstract
목적 : 직류/직류 변환기(DC/DC Converter) 내에 온도보상수단을 장착하여 직류/직류 변환기 자체의 출력효율을 제어함으로써 액정표시소자에 온도 보상된 구동전압을 공급하는 액정표시소자의 구동수단에 대해 개시한다.Purpose: To control the output efficiency of the DC / DC converter itself by installing the temperature compensation means in the DC / DC converter, and to the driving means of the liquid crystal display device to supply the temperature compensated driving voltage to the liquid crystal display device. It starts.
구성 : 본 발명의 액정표시소자의 구동수단은, 입력되는 직류전압을 충전기에 의해 전하 펌핑하여 출력전압의 레벨을 변화시키는 출력전압 변화수단과, 레벨 변화되어 출력되는 전압을 온도 변화에 따라 보상하여 출력시키기 위해 충전기에 접속한 온도보상수단을 포함하여 이루어진 직류/직류 변환기와; 직류/직류 변환기로부터 출력된 출력전압을 안정화시켜 액정표시소자에 구동전압을 인가하는 임피던스 버퍼부;를 포함하여 이루어진 것을 특징으로 한다.Configuration: The driving means of the liquid crystal display device of the present invention comprises: output voltage changing means for changing the level of the output voltage by charge pumping the input DC voltage by a charger, and compensating the voltage outputted with the level change according to temperature change A DC / DC converter comprising a temperature compensating means connected to a charger for outputting the battery; And an impedance buffer unit for stabilizing the output voltage output from the DC / DC converter to apply a driving voltage to the liquid crystal display device.
효과 : 직류/직류 변환기에 온도보상수단을 내장시킴으로써 액정표시소자 구동수단의 회로구성이 간단해진다. 이에 따라 비용을 절감할 수 있을 뿐만 아니라 액정표시소자의 경량화 및 고집적화가 가능하다.Effect: By incorporating the temperature compensation means into the DC / DC converter, the circuit configuration of the liquid crystal display element driving means is simplified. Accordingly, not only the cost can be reduced, but also the light weight and high integration of the liquid crystal display device can be achieved.
Description
본 발명은 액정표시소자에 관한 것으로, 특히 직류/직류 변환기 내에 온도보상수단을 장착하여 직류/직류 변환기 자체의 출력효율을 제어함으로써 액정표시소자에 온도 보상된 구동전압을 공급하는 액정표시소자의 구동수단에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device. In particular, a temperature compensating device is mounted in a DC / DC converter to control the output efficiency of the DC / DC converter itself. It is about means.
최근, 액정표시소자는 소형 전자계산기에서부터 대형 디스플레이장치에 이르기까지 널리 사용되고 있으며, 가급적이면 외부의 여러 가지 변화요인들에 대해서도 최상의 디스플레이 기능을 발휘하는 것이 중요한 관건이다. 액정표시소자의 액정을 구동하기 위해서는 배터리 또는 직류/직류 변환기를 이용하여 액정의 구동에 필요한 전압을 공급하게 된다.Recently, liquid crystal display devices are widely used from small electronic calculators to large display devices, and it is important to display the best display function even with various external change factors. In order to drive the liquid crystal of the liquid crystal display device, a voltage required for driving the liquid crystal is supplied by using a battery or a DC / DC converter.
액정표시소자는 그 특성상, 주변환경의 온도가 상승하면 승압회로의 효율이 상승하여 출력전압이 커지게 되는데 반해, 액정 자체는 온도가 상승하면 낮은 구동전압을 요구하여 상반되는 특성을 가지고 있다. 마찬가지로 온도가 하강하면 승압회로의 효율이 떨어져 출력전압이 낮아지게 되는데 반해, 액정 자체는 온도가 하강하면 높은 구동전압을 요구하여 상반되는 특성을 가지고 있다.In the liquid crystal display device, when the temperature of the surrounding environment rises, the efficiency of the booster circuit increases and the output voltage increases, whereas the liquid crystal itself requires a low driving voltage when the temperature rises. Similarly, when the temperature decreases, the efficiency of the booster circuit is lowered, and the output voltage is lowered. On the other hand, the liquid crystal itself requires a high driving voltage when the temperature decreases.
이와 같이, 액정의 온도 변화에 따라 구동전압이 변하게 되므로 이를 해결하기 위해서, 온도 변화에 대응하여 액정에서 요구하는 구동전압을 공급하기 위해 온도보상방법이 많이 이용되고 있다.As such, since the driving voltage changes according to the temperature change of the liquid crystal, a temperature compensation method is widely used to supply the driving voltage required by the liquid crystal in response to the temperature change.
한편, 전압레벨은 직류/직류 변환기에서 출력되는 전압에 가장 크게 의존함으로써 여러가지 조건 변화에도 불구하고 일정 레벨을 출력하는 직류/직류 변환기는 필수적이다.On the other hand, the voltage level is most dependent on the voltage output from the DC / DC converter, so a DC / DC converter that outputs a constant level in spite of various conditions change is essential.
그러면, 종래의 액정표시소자의 온도보상회로에 대해 도면을 참조하여 설명하기로 한다.Then, the temperature compensation circuit of the conventional liquid crystal display device will be described with reference to the drawings.
도 2는 종래의 온도보상회로가 적용된 액정표시소자 구동회로의 일부분을 나타낸 도면이다. 도 2를 참조하면, 상기 액정표시소자의 구동회로는 크게 입력전압(VIN)을 승압시키는 직류/직류 변환기(10)와, 상기 직류/직류 변환기(10)로부터 출력된 출력전압(VOUT)의 변화를 최소화시킴과 동시에 안정화시키는 임피던스 버퍼회로(20)와, 상기 임피던스 버퍼회로(20)에서 안정화된 출력전압(VOUT)을 온도 변화에 따라 보상을 수행하는 온도보상회로(30)로 이루어져 있다.2 is a view showing a portion of a liquid crystal display element driving circuit to which a conventional temperature compensation circuit is applied. Referring to FIG. 2, the driving circuit of the liquid crystal display device includes a DC / DC converter 10 for boosting an input voltage V IN and an output voltage V OUT output from the DC / DC converter 10. Impedance buffer circuit 20 to minimize and at the same time stabilize the change, and the temperature compensation circuit 30 to compensate the output voltage (V OUT ) stabilized in the impedance buffer circuit 20 according to the temperature change have.
상기 직류/직류 변환기(10)에는 입력전압을 소정의 전압으로 승압시킨 변환전압을 저장할 수 있도록 배압기(11)가 접속되며, 상기 배압기(11)는 2배압, 3배압, 및 4배압 이상의 전압을 저장시킬 수 있도록 다수 접속되어 있다. 본 실시예에서는 3배압시키기 위해 3개의 캐패시터(C1, C2, C3)가 접속되어 있음을 알 수 있다.The DC / DC converter 10 is connected to a back voltage 11 so as to store a converted voltage by boosting the input voltage to a predetermined voltage, and the back voltage 11 is a double, three, and four times or more pressure. Many are connected to store the voltage. In the present embodiment, it can be seen that three capacitors C 1 , C 2 , and C 3 are connected in order to triple back pressure.
또한, 상기 임피던스 버퍼회로(20)는 저항 R1및 R2와 트랜지스터 TR1(Q1)로 이루어져 있다. 상기 출력전압(VOUT)을 받아 분배하는 저항 R1및 R2가 순차적으로 구성되어 접지되어 있다. 상기 저항 R1및 R2는 액정표시수단의 액정 고유값에 따라 정해지는 값이다. 상기 트랜지스터 TR1(Q1)은, 출력전압(VOUT)을 컬렉터로 입력받으며, 베이스는 상기 저항 R1과 저항 R2사이에 접속되고, 에미터는 온도보상회로(30)에 접속되어 있다.In addition, the impedance buffer circuit 20 includes resistors R 1 and R 2 and transistors TR 1 (Q 1 ). Resistors R 1 and R 2 , which receive and distribute the output voltage V OUT , are sequentially configured and grounded. The resistors R 1 and R 2 are values determined according to the liquid crystal intrinsic value of the liquid crystal display means. The transistor TR 1 (Q 1 ) receives an output voltage V OUT as a collector, a base is connected between the resistor R 1 and a resistor R 2 , and an emitter is connected to the temperature compensation circuit 30.
그리고, 상기 온도보상회로(30)는 서미스터(RTH), 저항 R3, 및 R4와 트랜지스터 TR2(Q2)로 이루어져 있다. 상기 안정화된 출력전압(VOUT)을 받아 온도변화에 따라저항값을 변화시키는 서미스터(RTH)와, 상기 안정화된 출력전압(VOUT)을 분배하는 저항 R3및 R4가 순차적으로 구성되어 접지되어 있다. 상기 저항 R3및 R4는 액정표시수단의 액정의 고유값에 따라 정해지는 값이다. 상기 트랜지스터 TR2(Q2)은, 안정화된 출력전압(VOUT)을 컬렉터 입력으로 하고, 베이스는 상기 저항 R3와 저항 R4사이에 접속되며, 에미터는 액정패널에 접속되어 구동전압(VLCD)을 출력하도록 구성되어 있다.The temperature compensation circuit 30 includes a thermistor R TH , a resistor R 3 , and R 4 and a transistor TR 2 (Q 2 ). The thermistor (R TH ) receiving the stabilized output voltage (V OUT ) and changing the resistance value according to the temperature change, and the resistors R 3 and R 4 for distributing the stabilized output voltage (V OUT ) are sequentially configured. It is grounded. The resistors R 3 and R 4 are values determined according to the intrinsic value of the liquid crystal of the liquid crystal display means. The transistor TR 2 (Q 2 ) has a stabilized output voltage V OUT as a collector input, a base is connected between the resistor R 3 and a resistor R 4 , and an emitter is connected to the liquid crystal panel so that the driving voltage V LCD ) is configured to output.
상기와 같이 구성된 종래의 구동회로는 온도가 변화됨에 따라 서미스터(RTH)의 저항값이 변화되어 구동전압(VLCD)의 보상이 이루어지게 된다. 이 서미스터(RTH)는 온도가 변화됨에 따라 저항값이 상승하거나 하강하여 전류량을 조절함으로써 구동전압(VLCD)을 안정화시키게 된다. 구체적으로 일반적인 저항은 온도가 상승함에 따라 저항값이 상승하게 되어 전류량이 작아지게 되는 반면, 서미스터(RTH), 예를들어 네가티브형 서미스터(RTH)인 경우에 저항값은 작아지게 되어 줄어든 전류량이 보상되어 일정한 전압을 출력시키게 된다. 물론, 온도가 하강하는 경우는 상보적인 동작에 의해 일정한 전압을 출력시키게 된다.In the conventional driving circuit configured as described above, the resistance value of the thermistor R TH is changed as the temperature is changed to compensate for the driving voltage V LCD . The thermistor R TH stabilizes the driving voltage V LCD by adjusting the amount of current by increasing or decreasing the resistance value as the temperature is changed. Specifically, the general resistance has a decrease in the amount of current as the resistance value increases as the temperature increases, whereas in the case of a thermistor (R TH ), for example, a negative type thermistor (R TH ), the resistance value becomes smaller and the amount of current decreased. This is compensated to output a constant voltage. Of course, when the temperature falls, a constant voltage is output by the complementary operation.
그러나, 종래의 온도보상회로(30)는, 온도변화에 따라 트랜지스터 TR1, TR2의 VBE값이 민감하게 변화됨에 따라 보상의 신뢰성이 감소될 뿐만 아니라 회로구성이어려워지며, 이와 동시에 전압변화의 폭도 제한된다는 단점이 있었다. 또한, 상기한 바와 같이 별도의 온도보상회로(30)를 마련함으로써 구성이 복잡해지고 이에 따라, 비용이 상승할 뿐만 아니라 경량화 및 고집적화에 불리하다는 단점이 있었다.However, in the conventional temperature compensation circuit 30, as the V BE values of the transistors TR 1 and TR 2 are sensitively changed according to the temperature change, the reliability of compensation is not only reduced but also the circuit configuration becomes difficult, and at the same time, the voltage change It also had the disadvantage of being limited in width. In addition, as described above, by providing a separate temperature compensation circuit 30, the configuration is complicated, and thus, there is a disadvantage in that the cost is increased and the weight and high integration are disadvantageous.
따라서, 본 발명의 목적은 직류/직류 변환기 내에 온도보상수단을 장착하여 직류/직류 변환기 자체의 출력효율을 제어함으로써 액정표시소자에 온도 보상된 구동전압을 공급하는 액정표시소자의 구동수단을 제공하는데 있다.Accordingly, an object of the present invention is to provide a driving means of a liquid crystal display device for supplying a temperature compensated driving voltage to the liquid crystal display device by controlling the output efficiency of the DC / DC converter itself by mounting a temperature compensation means in the DC / DC converter. have.
도 1은 본 발명의 일 실시예에로서, 서미스터가 내장된 직류/직류 변환기의 개략적인 구성도,1 is a schematic diagram of a DC / DC converter with a thermistor built in an embodiment of the present invention;
도 2는 종래의 온도보상회로가 적용된 액정표시소자 구동회로의 일부분을 나타낸 도면이다.2 is a view showing a portion of a liquid crystal display element driving circuit to which a conventional temperature compensation circuit is applied.
**도면의 주요부분에 대한 부호의 설명**** Description of the symbols for the main parts of the drawings **
100 : 직류/직류 변환기 110 : 배압기100: DC / DC converter 110: back pressure
200 : 임피던스 버퍼회로200: impedance buffer circuit
상기한 목적을 달성하기 위해 본 발명의 액정표시소자의 구동수단은, 입력되는 직류전압을 충전기에 의해 전하 펌핑하여 출력전압의 레벨을 변화시키는 출력전압 변화수단과, 상기 레벨 변화되어 출력되는 전압을 온도 변화에 따라 보상하여 출력시키기 위해 상기 충전기에 접속한 온도보상수단을 포함하여 이루어진 직류/직류 변환기와; 상기 직류/직류 변환기로부터 출력된 출력전압을 안정화시켜 액정표시소자에 구동전압을 인가하는 임피던스 버퍼부;를 포함하여 이루어진 것을 특징으로 한다.In order to achieve the above object, the driving means of the liquid crystal display device of the present invention, the output voltage changing means for changing the level of the output voltage by charge pumping the input DC voltage by the charger, A DC / DC converter comprising a temperature compensating means connected to the charger for compensating and outputting the temperature according to the change of temperature; And an impedance buffer unit for stabilizing an output voltage output from the DC / DC converter to apply a driving voltage to the liquid crystal display device.
이 때, 상기 온도보상수단과 충전기는, 온도 변화에 따라 임피던스를 변화시키기 위해 직렬 및 병렬 접속방식에서 선택된 어느 하나의 접속방식으로 접속되는 것이 바람직하다.At this time, the temperature compensation means and the charger is preferably connected in any one of the connection method selected from the series and parallel connection method in order to change the impedance according to the temperature change.
또한, 상기 온도보상수단으로는 서미스터를 사용하며, 다수의 충전기에 선택적으로 접속되는 것이 바람직하다.In addition, it is preferable that a thermistor is used as the temperature compensating means and is selectively connected to a plurality of chargers.
이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예에 대해 설명한다.Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.
본 발명의 도면에 있어서, 종래와 동일 기능을 수행하는 구성요소에 대해서는 종래와 동일한 기호를 사용한다.In the drawings of the present invention, the same symbols as those of the prior art are used for components that perform the same functions as in the prior art.
도 1은 본 발명의 일 실시예에로서, 서미스터가 내장된 직류/직류 변환기의 개략적인 구성도이다. 도 1을 참조하면, 본 발명의 액정표시소자의 구동회로는 크게, 입력전압(VIN)을 승압시킴과 동시에 온도변화에 따라 출력전압(VOUT)을 보상할 수 있도록 서미스터(RTH)를 내장시켜 자체적으로 출력전압(VOUT)의 효율을 조절하는 직류/직류 변환기(100)와, 상기 직류/직류 변환기(100)로부터 출력된 출력전압(VOUT)의 변화를 최소화시켜 안정된 구동전압(VLCD)을 출력시키는 임피던스 버퍼회로(200)로 이루어져 있다.1 is a schematic diagram of a DC / DC converter with a thermistor according to an embodiment of the present invention. Referring to FIG. 1, the driving circuit of the liquid crystal display device of the present invention greatly increases the input voltage V IN and adjusts the thermistor R TH to compensate for the output voltage V OUT according to temperature change. The built-in DC / DC converter 100 to adjust the efficiency of the output voltage (V OUT ) by itself, and the stable driving voltage (Minimum) by minimizing the change of the output voltage (V OUT ) output from the DC / DC converter (100) V LCD ) outputs an impedance buffer circuit 200.
상기 직류/직류 변환기(100)에는 입력전압(VIN)을 소정의 전압으로 승압시킨 변환전압을 저장할 수 있도록 배압기(110)가 접속되며, 상기 배압기(110)는 2배압, 3배압, 및 4배압 이상의 전압을 저장시킬 수 있도록 다수 캐패시터가 접속되어 있다. 본 실시예에서는 3배압시키기 위해 3개의 캐패시터(C1, C2, C3)가 접속되어 있음을 알 수 있다.A back pressure 110 is connected to the DC / DC converter 100 so as to store a converted voltage obtained by boosting the input voltage V IN to a predetermined voltage. And a plurality of capacitors are connected to store voltages equal to or greater than 4 times the voltage. In the present embodiment, it can be seen that three capacitors C 1 , C 2 , and C 3 are connected in order to triple back pressure.
여기에 본 발명의 특징부로서, 직류/직류 변환기(100)에 형성된 캐패시터(C1)에 서미스터(RTH)를 직렬로 접속하여 온도에 따른 등가직렬저항(Equivalant Series Resistance; ESR)값을 조절하고 있다. 특히, 입력전압(VIN)을 승압하는 C1의 ESR값에 따라 출력전압(VOUT)이 크게 변화되므로 상기 캐패시터(C1)에 직렬로 접속한다.As a feature of the present invention, the thermistor R TH is connected in series to a capacitor C 1 formed in the DC / DC converter 100 to adjust an equivalent series resistance (ESR) value according to temperature. Doing. In particular, since the output voltage V OUT varies greatly according to the ESR value of C 1 that boosts the input voltage V IN , the capacitor C 1 is connected in series.
물론, 캐패시터 C2및 C3에도 직렬로 접속하여 전체적인 ESR값을 조절할 수 있다. 또한, 서미스터(RTH)가 포지티브형 및 네가티브형 중에서 선택된 어느 하나를 이용할 경우에 선택적으로 직렬 또는 병렬 접속방식을 이용한다.Of course, it is also possible to adjust the overall ESR value by connecting the capacitors C 2 and C 3 in series. In addition, when the thermistor R TH uses any one selected from a positive type and a negative type, an optional serial or parallel connection method is used.
또한, 상기 임피던스 버퍼회로(200)는 저항 R1및 R2와 트랜지스터 TR1(Q1)로 이루어져 있다. 상기 출력전압(VOUT)을 받아 분배하는 저항 R1및 R2가 순차적으로 구성되어 접지되어 있다. 상기 저항 R1및 R2는 액정표시수단의 액정의 고유값에 따라 정해지는 값이다. 상기 트랜지스터 TR1(Q1)은, 출력전압(VOUT)을 컬렉터로 입력받으며, 베이스는 상기 R1과 R2사이에 접속되고, 에미터는 안정화된 구동전압(VLCD)을 액정패널로 출력한다.In addition, the impedance buffer circuit 200 includes resistors R 1 and R 2 and transistors TR 1 (Q 1 ). Resistors R 1 and R 2 , which receive and distribute the output voltage V OUT , are sequentially configured and grounded. The resistors R 1 and R 2 are values determined according to the intrinsic value of the liquid crystal of the liquid crystal display means. The transistor TR 1 (Q 1 ) receives an output voltage (V OUT ) as a collector, a base is connected between the R 1 and R 2 , and an emitter outputs a stabilized driving voltage (V LCD ) to a liquid crystal panel. do.
상기와 같이 구성된 본 발명의 액정표시소자의 구동회로는, 상기 직류/직류 변환기(100)에서 상기 입력전압(VIN)을 분배한 분배전압과 기준전압을 비교하여 전류를 늘리거나 줄여서 승압시키게 되고, 이 승압된 전압을 배압기에 저장하게 된다. 이 때, 온도가 변화됨에 따라 서미스터(Rth)의 저항값이 변화되어 서미스터와 캐패시터의 임피던스 변화에 따라 배압기에 충전되는 전류량이 제어된다. 이에 따라, 직류/직류 변환기(100)의 출력전압 효율을 제어하게 된다.In the driving circuit of the liquid crystal display device of the present invention configured as described above, the DC / DC converter 100 boosts the current by increasing or decreasing the current by comparing the divided voltage with which the input voltage V IN is divided and the reference voltage. The boosted voltage is stored in the back voltage. At this time, as the temperature is changed, the resistance value of the thermistor R th is changed to control the amount of current charged in the back voltage according to the impedance change of the thermistor and the capacitor. Accordingly, the output voltage efficiency of the DC / DC converter 100 is controlled.
결국, 본 발명의 액정표시소자의 구동회로는 직류/직류 변환기(100)에서 온도보상이 이루어짐을 알 수 있다. 또한, 최초 전원 인가시에 나타나는 러시전류(Rush Current)를 최소화하여 전체 회로의 안정화를 구현할 수 있다.As a result, it can be seen that the driving circuit of the liquid crystal display device of the present invention performs temperature compensation in the DC / DC converter 100. In addition, it is possible to implement the stabilization of the entire circuit by minimizing the rush current (Rush Current) appearing when the power is initially applied.
상술한 바와 같이, 본 발명에 따른 액정표시소자의 구동수단은, 직류/직류 변환기에 온도보상수단을 내장시킴으로써 액정표시소자 구동수단의 회로구성이 간단해진다. 이에 따라 비용을 절감할 수 있을 뿐만 아니라 액정표시소자의 경량화 및 고집적화가 가능하다.As described above, the driving means of the liquid crystal display element according to the present invention simplifies the circuit configuration of the liquid crystal display element driving means by incorporating a temperature compensating means in the DC / DC converter. Accordingly, not only the cost can be reduced, but also the light weight and high integration of the liquid crystal display device can be achieved.
본 발명은 상술한 실시예에 한정되지 않으며, 본 발명의 기술적 사상 내에서 당분야에서 통상의 지식을 가진 자에 의하여 많은 변형이 가능함은 명백하다.The present invention is not limited to the above-described embodiment, and it is apparent that many modifications are possible by those skilled in the art within the technical spirit of the present invention.
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| KR1019990057426A KR100315121B1 (en) | 1999-12-14 | 1999-12-14 | Liquid Crystal Display Driver |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7460112B2 (en) | 2003-06-02 | 2008-12-02 | Seiko Epson Corporation | Electro-optical module, power supply substrate, wiring substrate, and electronic apparatus |
| US7764265B2 (en) | 2005-07-26 | 2010-07-27 | Samsung Electronics Co., Ltd. | Driving apparatus for display device and display device including the same and method of driving the same |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101193111B1 (en) | 2005-10-18 | 2012-10-22 | 삼성디스플레이 주식회사 | Circuit for generating temperature compensated driving voltage and liquid crystal display device having the same and method for generating driving voltage |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7460112B2 (en) | 2003-06-02 | 2008-12-02 | Seiko Epson Corporation | Electro-optical module, power supply substrate, wiring substrate, and electronic apparatus |
| US8860698B2 (en) | 2003-06-02 | 2014-10-14 | Seiko Epson Corporation | Electro-optical module, power supply substrate, wiring substrate, and electronic apparatus |
| US9144154B2 (en) | 2003-06-02 | 2015-09-22 | Seiko Epson Corporation | Electro-optical module, power supply substrate, wiring substrate, and electronic apparatus |
| US9451703B2 (en) | 2003-06-02 | 2016-09-20 | Seiko Epson Corporation | Electro-optical module, power supply substrate, wiring substrate, and electronic apparatus |
| US9947261B2 (en) | 2003-06-02 | 2018-04-17 | Seiko Epson Corporation | Electro-optical module, power supply substrate, wiring substrate, and electronic apparatus |
| US10769981B2 (en) | 2003-06-02 | 2020-09-08 | 138 East Lcd Advancements Limited | Electro-optical module, power supply substrate, wiring substrate, and electronic apparatus |
| US11170697B2 (en) | 2003-06-02 | 2021-11-09 | 138 East Lcd Advancements Limited | Electro-optical module, power supply substrate, wiring substrate, and electronic apparatus |
| US11587495B2 (en) | 2003-06-02 | 2023-02-21 | 138 East Lcd Advancements Limited | Electro-optical module, power supply substrate, wiring substrate, and electronic apparatus |
| US7764265B2 (en) | 2005-07-26 | 2010-07-27 | Samsung Electronics Co., Ltd. | Driving apparatus for display device and display device including the same and method of driving the same |
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