KR20000027770A - Common signal circuit for lcd - Google Patents
Common signal circuit for lcd Download PDFInfo
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- KR20000027770A KR20000027770A KR1019980045787A KR19980045787A KR20000027770A KR 20000027770 A KR20000027770 A KR 20000027770A KR 1019980045787 A KR1019980045787 A KR 1019980045787A KR 19980045787 A KR19980045787 A KR 19980045787A KR 20000027770 A KR20000027770 A KR 20000027770A
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- South Korea
- Prior art keywords
- common signal
- adjusting unit
- adjusting
- level
- signal circuit
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- Legal status (The legal status 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 status listed.)
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- 239000004973 liquid crystal related substance Substances 0.000 claims description 12
- 238000010586 diagram Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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
- G09G3/34—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
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
- G09G3/3655—Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
-
- 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
- G09G3/3648—Control of matrices with row and column drivers using an active 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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0204—Compensation of DC component across the pixels in flat panels
-
- 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
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0252—Improving the response speed
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Power Engineering (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
Description
본 발명은 액정 표시 장치의 공통신호 회로에 관한 것으로, 보다 구체적으로는 플리커(flicker)를 완전히 제거할 수 있는 액정 표시 장치의 공통신호 회로에 관한 것이다.The present invention relates to a common signal circuit of a liquid crystal display device, and more particularly, to a common signal circuit of a liquid crystal display device capable of completely removing flicker.
일반적으로 액정 표시 장치는 차세대 표시 장치로서 막대한 시장이 형성될 전망이며, 액정 디스플레이 기술도 현저히 발전하는 추세이며, 디스플레이의 표시 성능도 크게 향상되었다.In general, the liquid crystal display device is expected to form a huge market as a next-generation display device, the liquid crystal display technology is also significantly developed, and the display performance of the display is greatly improved.
그러나, 이러한 액정 표시 장치는 대면적 고용량 추세로 감에 따라, 박막 트랜지스터의 크기도 커지게 됨으로 인하여, 박막 트랜지스터의 기생 캐패시턴스에 의하여 픽셀 전압의 쉬프트가 발생된다.However, as the liquid crystal display device tends to have a large area and a high capacity, the size of the thin film transistor is also increased, so that the shift of pixel voltage is generated by the parasitic capacitance of the thin film transistor.
이로인하여, 시간에 따라 투과도가 점점 저하되어, 화면에 반짝거리는 현상이 발생되는데, 이를 플리커 현상이라 한다.As a result, the transmittance gradually decreases with time, thereby causing a phenomenon of flickering on the screen, which is called a flicker phenomenon.
종래에는 이러한 플리커 현상을 제거하기 위하여, 공통신호(Vcom) 회로장치에 공통신호의 센터 레벨(center level)을 조정하는 회로부와, 공통신호의 진폭을 조정하는 회로부를 동시에 설치하여, 픽셀 전압이 쉬프트되었을 때, 공통신호의 센터 레벨 및 진폭을 조정하여, 플리커가 발생되지 않도록 하였다.Conventionally, in order to eliminate such a flicker phenomenon, the circuit portion for adjusting the center level of the common signal and the circuit portion for adjusting the amplitude of the common signal are simultaneously provided in the common signal (Vcom) circuit device to shift the pixel voltage. In this case, the center level and amplitude of the common signal are adjusted to prevent flicker.
그러나, 상기한 액정 표시 장치의 공통신호 회로 장치는 다음과 같은 문제점이 있다.However, the common signal circuit device of the liquid crystal display device has the following problems.
먼저, 상기 공통 신호 회로 장치를 구성하는 센터 레벨 조절회로부와 진폭 조절부는 포지티브 레벨(positive level) 및 네가티브 레벨(negative level)을 동시에 조절하게 된다.First, the center level adjusting circuit part and the amplitude adjusting part constituting the common signal circuit device simultaneously adjust the positive level and the negative level.
그러나, 이렇게 포지티브 레벨과 네가티브 레벨이 동시에 조절되면, 포지티브 프레임에서의 킥백 전압(ΔVp)과 네가티브 프레임에서의 킥백 전압이 동일할 경우에는 플리커를 제거할 수 있으나, 대개의 경우 포지티브 프레임에서와 네가티브 프레임에서의 킥백 전압이 약간씩 상이하므로, 완전하게 플리커를 제거할 수 없다.However, if the positive level and the negative level are simultaneously adjusted, flicker can be eliminated when the kickback voltage (ΔVp) in the positive frame and the kickback voltage in the negative frame are the same, but in most cases, the positive frame and the negative frame are removed. Since the kickback voltage at is slightly different, flicker cannot be completely removed.
따라서, 본 발명의 목적은 플리커 현상을 완벽하게 제거할 수 있는 액정 표시 장치의 공통신호 회로를 제공하는 것을 목적으로 한다.Accordingly, an object of the present invention is to provide a common signal circuit of a liquid crystal display device capable of completely eliminating the flicker phenomenon.
도 1은 본 발명에 따른 액정 표시 장치의 공통 신호 회로를 개략적으로 나타낸 회로도.1 is a circuit diagram schematically showing a common signal circuit of a liquid crystal display according to the present invention.
(도면의 주요 부분에 대한 부호의 설명)(Explanation of symbols for the main parts of the drawing)
1 : 제 1 조절부 5 : 제 2 조절부1: first adjusting unit 5: second adjusting unit
10 : 제어부 15 : 극성 선택라인10: control unit 15: polarity selection line
상기한 본 발명의 목적을 달성하기 위하여, 본 발명의 일 실시예에 따르면, 포지티브 레벨의 공통 신호의 레벨의 진폭을 조절하는 제 1 조절부와, 네가티브 레벨의 공통 신호의 진폭을 조절하는 제 2 조절부, 및 제 1 조절부와 제 2 조절부에 의하여 조절된 신호가 입력되어, 극성 선택에 따라 제 1 조절부로부터 입력된 값 또는 제 2 조절부로부터 입력된 값을 선택적으로 출력하는 제어부를 포함하는 것을 특징으로 한다.In order to achieve the above object of the present invention, according to an embodiment of the present invention, the first control unit for adjusting the amplitude of the level of the common signal of the positive level, and the second adjusting the amplitude of the common signal of the negative level A control unit and a control unit for inputting a signal adjusted by the first control unit and the second control unit to selectively output a value input from the first control unit or a value input from the second control unit according to the polarity selection; It is characterized by including.
이때, 제 1 조절부 및 제 2 조절부는 가변 저항이다.In this case, the first adjusting part and the second adjusting part are variable resistors.
상기 제어부는 멀티플렉서이다.The control unit is a multiplexer.
본 발명에 의하면, 공통 신호의 포지티브 레벨과 네가티브 레벨의 각각 조절하므로써, 포지티브 프레임에서의 킥백 전압(ΔVp)과 네가티브 프레임에서의 킥백 전압을 동일하게 한다.According to the present invention, the kickback voltage [Delta] Vp in the positive frame and the kickback voltage in the negative frame are made equal by adjusting each of the positive level and the negative level of the common signal.
이에따라, 플리커를 용이하게 제어할 수 있다.Accordingly, flicker can be easily controlled.
(실시예)(Example)
이하 첨부한 도면에 의거하여 본 발명의 바람직한 실시예를 자세히 설명하도록 한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
첨부한 도면 도 1은 본 발명에 따른 액정 표시 장치의 공통신호 회로를 개략적으로 나타낸 도면이다.1 is a diagram schematically illustrating a common signal circuit of a liquid crystal display according to the present invention.
본 발명에서는 킥백 전압이 포지티브 프레임에서와 네가티브 프레임에서 각각 다르므로 발생되는 플리커 현상을 제거하기 위하여, 공통 신호를 포지티브 레벨 및 네가티브 레벨별로 각각 조절할 수 있는 회로를 제공한다.In the present invention, in order to eliminate the flicker phenomenon that occurs because the kickback voltage is different in the positive frame and the negative frame, a circuit capable of adjusting the common signal for each of the positive level and the negative level is provided.
본 발명에 따른 액정 표시 장치의 공통 신호 회로는, 포지티브 레벨의 공통 신호의 진폭을 조절하는 제 1 조절부(1)와, 네가티브 레벨의 공통 신호의 진폭을 조절하는 제 2 조절부(5), 및 제 1 조절부(1)와 제 2 조절부(5)에 의하여 조절된 신호가 입력되고, 극성 선택 라인의 신호에 따라 제 1 조절부(1)로부터 입력된 값 또는 제 2 조절부(2)로부터 입력된 값을 선택적으로 출력하는 제어부(10)를 포함한다.The common signal circuit of the liquid crystal display according to the present invention includes a first adjusting unit 1 for adjusting the amplitude of the common signal at the positive level, a second adjusting unit 5 for adjusting the amplitude of the common signal at the negative level, And a signal adjusted by the first adjusting unit 1 and the second adjusting unit 5 is input, and a value input from the first adjusting unit 1 or the second adjusting unit 2 according to the signal of the polarity selection line. It includes a control unit 10 for selectively outputting the value input from the ().
이때, 제 1 및 제 2 조절부(1,5)는 가변 저항으로 입력 전압을 분배하여 원하는 전압 레벨을 만든다.At this time, the first and second adjusters 1 and 5 distribute the input voltage to the variable resistor to make a desired voltage level.
또한, 상기 제어부(10)는 멀티 플렉서로 구성된다.In addition, the control unit 10 is composed of a multiplexer.
이러한 구성을 갖는 액정 표시 장치의 공통 신호 회로의 동작을 설명한다.The operation of the common signal circuit of the liquid crystal display device having such a configuration will be described.
가변 저항으로 된 제 1 조절부(1)와 제 2 조절부(5)를 조절하여, 멀티플렉서에 원하는 전압값을 입력시킨다.The first regulator 1 and the second regulator 5 of the variable resistor are adjusted to input a desired voltage value to the multiplexer.
멀티플렉서로 된 제어부(10)에서는 제 1 및 제 2 조절부(1,5)로부터 입력되어진 DC 레벨의 전압을 공통 신호(Vcom) 구형파를 만든다. 이때, 제어부(10)에는 극성 선택 라인(15)이 구비되어, 이 극성 선택 라인(15)으로부터 입력되는 신호에 따라 포지티브 레벨인지 네가티브 레벨인지를 결정하고, 이에 따라, 제 1 조절부(1) 또는 제 2 조절부(5)로부터 입력받은 신호를 선택적으로 출력한다.In the multiplexer control unit 10, a common signal Vcom square wave is generated from the DC level voltages input from the first and second control units 1 and 5. At this time, the control unit 10 is provided with a polarity selection line 15, and determines whether it is a positive level or a negative level according to the signal input from the polarity selection line 15, and accordingly, the first adjusting unit 1 Alternatively, the signal received from the second control unit 5 is selectively output.
이상에서 자세히 설명된 바와 같이, 본 발명에 의하면, 공통 신호의 포지티브 레벨과 네가티브 레벨의 각각 조절하므로써, 포지티브 프레임에서의 킥백 전압(ΔVp)과 네가티브 프레임에서의 킥백 전압을 동일하게 한다.As described in detail above, according to the present invention, the kickback voltage [Delta] Vp in the positive frame and the kickback voltage in the negative frame are made equal by adjusting each of the positive level and the negative level of the common signal.
이에따라, 플리커를 용이하게 제어할 수 있다.Accordingly, flicker can be easily controlled.
기타, 본 발명은 그 요지를 일탈하지 않는 범위에서 다양하게 변경하여 실시할 수 있다.In addition, this invention can be implemented in various changes within the range which does not deviate from the summary.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019980045787A KR20000027770A (en) | 1998-10-29 | 1998-10-29 | Common signal circuit for lcd |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019980045787A KR20000027770A (en) | 1998-10-29 | 1998-10-29 | Common signal circuit for lcd |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR20000027770A true KR20000027770A (en) | 2000-05-15 |
Family
ID=19556106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019980045787A Ceased KR20000027770A (en) | 1998-10-29 | 1998-10-29 | Common signal circuit for lcd |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR20000027770A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH075431A (en) * | 1993-11-08 | 1995-01-10 | Toshiba Corp | Active matrix type liquid crystal display device |
| JPH07219484A (en) * | 1994-02-02 | 1995-08-18 | Fujitsu Ltd | Liquid crystal display |
| JPH10260664A (en) * | 1997-01-16 | 1998-09-29 | Nec Corp | Liquid crystal driving circuit and liquid crystal device using the same |
-
1998
- 1998-10-29 KR KR1019980045787A patent/KR20000027770A/en not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH075431A (en) * | 1993-11-08 | 1995-01-10 | Toshiba Corp | Active matrix type liquid crystal display device |
| JPH07219484A (en) * | 1994-02-02 | 1995-08-18 | Fujitsu Ltd | Liquid crystal display |
| JPH10260664A (en) * | 1997-01-16 | 1998-09-29 | Nec Corp | Liquid crystal driving circuit and liquid crystal device using the same |
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