KR100605726B1 - Noise Reduction Method of Digital Flat Panel Display - Google Patents
Noise Reduction Method of Digital Flat Panel Display Download PDFInfo
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- KR100605726B1 KR100605726B1 KR1020040109478A KR20040109478A KR100605726B1 KR 100605726 B1 KR100605726 B1 KR 100605726B1 KR 1020040109478 A KR1020040109478 A KR 1020040109478A KR 20040109478 A KR20040109478 A KR 20040109478A KR 100605726 B1 KR100605726 B1 KR 100605726B1
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- 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
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- 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
- G09G3/2092—Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto
- G09G3/2096—Details of the interface to the display terminal specific for a flat panel
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- H04N9/00—Details of colour television systems
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Abstract
본 발명은 디지털 평판 디스플레이장치의 노이즈 제거 방법에 관한 것으로, 특히 디지털 평판 디스플레이 장치에서 영상을 디스플레이 하기 위해 아날로그 영상신호를 디지털 영상신호로 컨버터 하는 과정에서 기준점으로 삼는 그라운드 전위를 디텍트 한 후 디스플레이 할 때 그라운드 전위의 역 위상을 실제 영상에 보정하여 노이즈를 제거함으로써 최적의 영상신호를 디스플레이 할 수 있도록 한 디지털 평판 디스플레이장치의 노이즈 제거 방법에 관한 것이다.The present invention relates to a method for removing noise of a digital flat panel display device. In particular, in order to display an image on a digital flat panel display device, a ground potential serving as a reference point is detected after the analog video signal is converted into a digital video signal. The present invention relates to a noise reduction method of a digital flat panel display device which displays an optimum image signal by correcting an inverse phase of ground potential to an actual image to remove noise.
평판 디스플레이장치, 디지털, 전위, 그라운드Flat Panel Display, Digital, Potential, Ground
Description
도 1 은 본 발명에 의한 디지털 평판 디스플레이장치의 노이즈 제거 방법을 설명하기 위한 도면.1 is a view for explaining a noise removing method of a digital flat panel display device according to the present invention.
<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>
10 : 제 1 A/D 컨버터10: first A / D converter
20 : 제 2 A/D 컨버터20: second A / D converter
30 : 기준전압 발생기30: reference voltage generator
본 발명은 디지털 평판 디스플레이장치의 노이즈 제거 방법에 관한 것으로, 보다 상세하게는 디지털 평판 디스플레이 장치에서 영상을 디스플레이 하기 위해 아날로그 영상신호를 디지털 영상신호로 컨버터 하는 과정에서 기준점으로 삼는 그라운드 전위를 디텍트 한 후 디스플레이 할 때 그라운드 전위의 역위상을 실제 영상에 보정하여 노이즈를 제거함으로써 최적의 영상신호를 디스플레이 할 수 있도록 한 디지털 평판 디스플레이장치의 노이즈 제거 방법에 관한 것이다.The present invention relates to a noise removing method of a digital flat panel display device. More particularly, the present invention relates to detecting a ground potential that serves as a reference point in the process of converting an analog video signal to a digital video signal for displaying an image on a digital flat panel display device. The present invention relates to a noise reduction method of a digital flat panel display device that can display an optimal image signal by correcting an inverse phase of ground potential in a real image when removing the noise.
표시 장치 분야에서 음극선관(CRT : Cathode-Ray tube)은 공간을 많이 차지하고 전력 소비가 크기 때문에 점차 평판 디스플레이 장치로 대체되고 있는 추세이다. 특히, 액정 표시 장치(LCD : Liquid Crystal Display)는 대형화, 고화질, 경박화, 저소비 전력화의 진행에 따라, 이러한 평판 디스플레이 분야에서도 특히 각광받고 있다.Cathode-ray tubes (CRTs) are increasingly being replaced by flat panel display devices in the display device field because they occupy a lot of space and consume high power. In particular, liquid crystal displays (LCDs) are in the spotlight in the field of flat panel displays as the size, size, lightness, and low power consumption of the LCDs increase.
이러한 액정 표시 장치에서는 그래픽 데이터를 생성하는 모듈과 액정 표시 모듈 사이, 또는 액정 표시 모듈 내에서 타이밍 제어 IC와 데이터 드라이버 IC 사이의 데이터 전송을 위해 디지털 인터페이스(digital interface)가 요구된다. 이러한 디지털 인터페이스는 디지털 처리된 화상 데이터를 부가적인 데이터 처리회로 없이 직접적으로 전송하는 것을 가능하게 하므로, 저비용, 저소비전력 및 고품질의 표시장치를 구현시킨다.In such a liquid crystal display device, a digital interface is required for data transmission between a module for generating graphic data and a liquid crystal display module or between a timing control IC and a data driver IC within a liquid crystal display module. Such a digital interface enables direct transmission of digitally processed image data without additional data processing circuitry, thereby realizing a low cost, low power consumption, and high quality display device.
한편, 디지털 평판 디스플레이 장치는 아날로그 영상신호를 디지털 영상신호로 디스플레이 하기 위해 A/D 컨버터를 거친다. 그런데 영상신호가 아날로그로 존재할 때 전원의 불안정과 PCB 패턴 등의 영향으로 노이즈가 유입된다.Meanwhile, the digital flat panel display device goes through an A / D converter to display an analog video signal as a digital video signal. However, when the video signal is analog, noise is introduced due to the instability of the power supply and the PCB pattern.
이러한 아날로그 영상신호에 노이즈가 유입되는 것을 제거하기 위한 방법으로는 저역 통과 필터를 통한 고주파 성분의 제거 방법과 프레임 비교를 통한 노이 즈 제거 방법이 있다.As a method for removing noise from the analog video signal, there are a method of removing high frequency components through a low pass filter and a method of removing noise through frame comparison.
먼저, 저역 통과 필터를 통해 고주파 성분을 제거하는 방법은 고주파 성분의 노이즈만 제거가 가능하여 실제 영상에 노이즈에 의한 영향을 완전히 해소하지 못하고 샤프니스(SHARPNESS) 구현도 감소시키며 고주파와 같은 영상신호도 노이즈로 인지하여 필터링하는 문제점이 있다.First, the method of removing the high frequency components through the low pass filter can remove only the noise of the high frequency components, which does not completely eliminate the effect of noise on the real image, reduces the sharpness and reduces the image signal such as the high frequency. There is a problem of recognizing and filtering.
또한, 프레임 비교를 통한 노이즈 제거 방법은 복수개의 프레임 간에 비교를 통해 그 비교 결과 값에 따라 노이즈를 제거 하였으나, 움직임이 많은 동영상 처리 시 이를 노이즈로 인식하여 필터링하므로 영상신호의 선명도가 떨어지고 프레임을 저장하기 위한 메모리의 추가 비용도 증가하는 문제점이 있다. In addition, the noise elimination method using frame comparison removes noise according to the comparison result through comparison between a plurality of frames. However, when processing a moving video, the noise is recognized and filtered to reduce the sharpness of the image signal and save the frame. There is also a problem in that the additional cost of memory to increase.
본 발명은 상기와 같은 종래 기술의 문제점을 해결하기 위해 창안된 것으로, 디지털 평판 디스플레이 장치에서 영상을 디스플레이 하기 위해 아날로그 영상신호를 디지털 영상신호로 컨버터 하는 과정에서 기준점으로 삼는 그라운드 전위를 디텍트 한 후 디스플레이 할 때 그라운드 전위의 역 위상을 실제 영상에 보정하여 노이즈를 제거함으로써 최적의 영상신호를 디스플레이 할 수 있도록 한 디지털 평판 디스플레이장치의 노이즈 제거 방법을 제공하는데 그 목적이 있다.
The present invention has been made to solve the above problems of the prior art, and after detecting the ground potential as a reference point in the process of converting an analog video signal to a digital video signal to display an image in a digital flat panel display device It is an object of the present invention to provide a noise reduction method of a digital flat panel display device that displays an optimum image signal by correcting an inverse phase of ground potential on an actual image during display to remove noise.
상기와 같은 목적을 달성하기 위한 본 발명은 디지털 평판 디스플레이장치의 노이즈 제거 방법에 있어서, 상기 디지털 평판 디스플레이 장치에서 아날로그 R,G,B 영상신호를 디지털 영상신호로 컨버터하는 과정에서 기준으로 하는 그라운드 전위를 A/D 컨버터하고 상기 A/D 컨버터한 그라운드 전위를 상기 디지털 R,G,B 영상신호에 가감하여 그라운드를 보상한 후 다시 기준전압만큼 복원하여 영상 데이터를 보정함을 특징으로 한다.According to the present invention for achieving the above object, in the noise reduction method of the digital flat panel display device, the ground potential as a reference in the process of converting the analog R, G, B video signal into a digital video signal in the digital flat panel display device The A / D converter and the ground potential of the A / D converter are added to or subtracted from the digital R, G, and B video signals to compensate for the ground, and then restored to a reference voltage.
본 발명에서, 상기 그라운드 보상은 A/D 전환된 R,G,B 8bit의 디지털 영상데이터에서 A/D 전환된 그라운드 8bit 데이터를 차감하여 보정하고 보정된 데이터는 기준전압만큼 다시 복원시켜 그라운드의 노이즈 성분을 제거함을 특징으로 한다.In the present invention, the ground compensation is corrected by subtracting A / D-converted ground 8-bit data from A / D-converted R, G, B 8-bit digital image data and restoring the corrected data to a reference voltage again to reduce noise of the ground. Removing the component.
본 발명에서, 상기 보정된 데이터의 복원은 상기 그라운드 전위를 A/D 하기 위해 기준이 되는 정전압을 발생시키는 기준전압 발생기를 이용하여 상기 보정된 데이터에서 상기 기준전압 발생기의 정전압 만큼을 차감하여 복원함을 특징으로 한다.In the present invention, the restoration of the corrected data is performed by subtracting the constant voltage of the reference voltage generator from the corrected data by using a reference voltage generator for generating a constant voltage as a reference to A / D the ground potential. It is characterized by.
위와 같이, 본 발명은 디지털 평판 디스플레이 장치에서 영상을 디스플레이 하기 위해 아날로그 영상신호를 디지털 영상신호로 컨버터 하는 과정에서 기준점으로 삼는 그라운드 전위를 디텍트 한 후 디스플레이 할 때 그라운드 전위의 역 위상을 실제 영상에 보정하여 노이즈를 제거함으로써 최적의 영상신호를 디스플레이 할 수 있도록 하는 것이다.As described above, the present invention detects the ground potential as a reference point in the process of converting an analog video signal into a digital video signal in order to display an image on a digital flat panel display device, and then displays the reverse phase of the ground potential on the actual image. By correcting the noise, the optimal video signal can be displayed.
이하, 본 발명의 바람직한 실시예를 첨부한 도면을 참조하여 상세히 설명한다.Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.
도 1 은 본 발명에 의한 디지털 평판 디스플레이장치의 노이즈 제거 방법을 설명하기 위한 도면이다.1 is a view for explaining a noise removing method of a digital flat panel display device according to the present invention.
도 1 에 도시한 바와 같이, 본 발명은 디지털 평판 디스플레이장치의 노이즈 제거 방법에 있어서, 상기 디지털 평판 디스플레이 장치에서 아날로그 R,G,B 영상신호를 디지털 영상신호로 컨버터 하는 과정에서 기준으로 하는 그라운드 전위를 A/D 컨버터 하고 상기 A/D 컨버터 한 그라운드 전위를 상기 디지털 R,G,B 영상신호에 가감하여 그라운드를 보상한 후 다시 기준전압만큼 복원하여 영상 데이터를 보정하는 것이다.As shown in FIG. 1, the present invention provides a noise reduction method for a digital flat panel display device, wherein the ground potential as a reference in the process of converting an analog R, G, and B video signal into a digital video signal in the digital flat panel display device. The A / D converter and the ground potential of the A / D converter are added to or subtracted from the digital R, G, and B image signals to compensate for the ground, and then restored by the reference voltage to correct the image data.
먼저, 입력되는 아날로그 R,G,B 영상신호를 제 1 A/D 컨버터(10)에서 8bit의 디지털 R,G,B 영상신호로 컨버터 한다.First, the input analog R, G, B video signals are converted into 8-bit digital R, G, B video signals by the first A /
이때, 상기 A/D 컨버터(10)의 기준전위가 되는 그라운드 전위 역시 제 2 A/D 컨버터(20)에서 8bit의 디지털 그라운드 전위로 컨버터 한다.At this time, the ground potential that becomes the reference potential of the A /
그러고 나서, 상기 8bit의 디지털 R,G,B 영상신호에 8bit의 디지털 그라운드 전위만큼 가감하여 보정한다.Then, the 8-bit digital R, G, and B video signals are corrected by adding or subtracting 8-bit digital ground potentials.
그리고, 상기 보정된 데이터는 상기 그라운드 전위를 A/D 하기 위해 기준이 되는 정전압을 발생시키는 기준전압 발생기(30)를 이용하여 상기 보정된 데이터에서 상기 기준전압 발생기의 정전압 만큼을 차감하여 복원한다.The corrected data is restored by subtracting the corrected voltage of the reference voltage generator from the corrected data by using the
이처럼, 본 발명은 영상신호가 아날로그로 존재할 때 전원의 불안정과 PCB 패턴 등의 영향으로 유입되는 노이즈를 아날로그 R,G,B 영상신호를 디지털 영상신호로 컨버터하는 과정에서 기준으로 하는 그라운드 전위를 A/D 컨버터하고 상기 A/D 컨버터한 그라운드 전위를 상기 디지털 R,G,B 영상신호에 가감하여 그라운드를 보상한 후 다시 기준전압만큼 복원하여 영상 데이터를 보정하여 노이즈를 제거함으로써 최적의 영상신호를 디스플레이할 수 있는 것이다.As described above, according to the present invention, when the video signal exists in analog, the ground potential referred to as A in the process of converting the analog R, G, B video signal into a digital video signal by the noise introduced due to the instability of the power supply and the PCB pattern. The ground potential of the / D converter and the A / D converter is added to or subtracted from the digital R, G, and B video signals to compensate for the ground, and then restored to the reference voltage to correct the video data to remove noise to remove the optimum video signal. It can be displayed.
상술한 바와 같이, 본 발명은 디지털 평판 디스플레이 장치에서 영상을 디스플레이 하기 위해 아날로그 영상신호를 디지털 영상신호로 컨버터 하는 과정에서 기준점으로 삼는 그라운드 전위를 디텍트 한 후 디스플레이 할 때 그라운드 전위의 역 위상을 실제 영상에 보정하여 노이즈를 제거함으로써 최적의 영상신호를 디스플레이 할 수 있는 이점이 있다.
As described above, the present invention actually detects the ground potential as the reference point in the process of converting an analog video signal into a digital video signal in order to display an image in a digital flat panel display device. There is an advantage in that an optimal video signal can be displayed by correcting an image to remove noise.
Claims (3)
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0385085A (en) * | 1989-08-28 | 1991-04-10 | Fujitsu Ltd | Loop monitoring circuit and ground fault detection circuit |
| US5245341A (en) | 1991-02-23 | 1993-09-14 | Motorola, Inc. | Video analog-to-digital converter |
| KR20010083331A (en) * | 2000-02-10 | 2001-09-01 | 윤종용 | Analog to digital converter |
| KR100536543B1 (en) | 2002-11-28 | 2005-12-14 | 산요덴키가부시키가이샤 | Sequential comparing type ad converter and microcomputer |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0385085A (en) * | 1989-08-28 | 1991-04-10 | Fujitsu Ltd | Loop monitoring circuit and ground fault detection circuit |
| US5245341A (en) | 1991-02-23 | 1993-09-14 | Motorola, Inc. | Video analog-to-digital converter |
| KR20010083331A (en) * | 2000-02-10 | 2001-09-01 | 윤종용 | Analog to digital converter |
| KR100536543B1 (en) | 2002-11-28 | 2005-12-14 | 산요덴키가부시키가이샤 | Sequential comparing type ad converter and microcomputer |
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