KR100464047B1 - Compensation circuit for lamp current of liquid crystal display tv - Google Patents
Compensation circuit for lamp current of liquid crystal display tv Download PDFInfo
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- KR100464047B1 KR100464047B1 KR10-2002-0025938A KR20020025938A KR100464047B1 KR 100464047 B1 KR100464047 B1 KR 100464047B1 KR 20020025938 A KR20020025938 A KR 20020025938A KR 100464047 B1 KR100464047 B1 KR 100464047B1
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- 239000004973 liquid crystal related substance Substances 0.000 title 1
- 238000001514 detection method Methods 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract 2
- 238000010586 diagram Methods 0.000 description 5
- 230000005856 abnormality Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 125000001475 halogen functional group Chemical group 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Classifications
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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
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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
- G09G3/3406—Control of illumination source
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/24—Circuit arrangements in which the lamp is fed by high frequency AC, or with separate oscillator frequency
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters
- H05B41/282—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices
- H05B41/2821—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices by means of a single-switch converter or a parallel push-pull converter in the final stage
- H05B41/2824—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices by means of a single-switch converter or a parallel push-pull converter in the final stage using control circuits for the switching element
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Mathematical Physics (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
본 발명은 엘씨디 티브이에서 각 엘씨디 램프의 구동전류를 개별적으로 보상하여 보다 안정된 구동 상태를 유지하는 기술에 관한 것이다. 이러한 본 발명은, 후광용 램프(LA-LD)에 대한 각각의 피드백 전류를 검출하고, 각각의 검출 결과를 비교하여 그에 상응되는 검출신호를 출력하는 램프전류 검출부(110)와; 상기 램프전류 검출부(110)에서 출력되는 검출신호에 따라 펄스폭 변조신호를 조정하기 위한 제어신호를 출력하는 마이크로컴퓨터(120)와; 상기 마이크로컴퓨터(120)로부터 입력되는 제어신호에 상응되게 펄스폭 변조신호를 각기 조정하여 출력하는 PWM 집적소자부(130)와; 상기 PWM 집적소자부(130)로부터 입력되는 각각의 펄스폭 변조신호에 의해 각각의 트랜스가 구동되어 상기 후광용 램프(LA-LD)에 구동전류를 공급하는 트랜스부(140)에 의해 달성된다.The present invention relates to a technique for maintaining a more stable driving state by individually compensating the drive current of each LED lamp in the LCD TV. The present invention includes a lamp current detection unit 110 for detecting respective feedback currents for the backlight lamp LA-LD, comparing the respective detection results, and outputting corresponding detection signals; A microcomputer (120) for outputting a control signal for adjusting a pulse width modulation signal according to the detection signal output from the lamp current detection unit (110); A PWM integrated device unit (130) for adjusting and outputting a pulse width modulation signal in accordance with a control signal input from the microcomputer (120); Each transformer is driven by each pulse width modulation signal input from the PWM integrated device unit 130 to be achieved by the transformer unit 140 supplying a driving current to the backlight lamp LA-LD.
Description
본 발명은 엘씨디 티브이에서 엘씨디 램프를 안정되게 구동시키는 기술에 관한 것으로, 특히 각 램프의 구동전류를 체크하여 그 체크 결과에 따라 해당 램프의 구동전류를 자동으로 보상해줄 수 있도록 한 엘씨디 티브이의 램프전류 보상회로에 관한 것이다.The present invention relates to a technology for stably driving an LCD lamp in an LCD TV, and in particular, to check the driving current of each lamp and to automatically compensate the driving current of the corresponding lamp according to the result of the lamp. It relates to a compensation circuit.
엘씨디 모듈에서는 영상을 디스플레이하기 위해 반드시 후광 램프를 사용하도록 되어 있다. 따라서, 종래의 엘씨디 티브이에 있어서는 안정된 디스플레이 동작을 보장하기 위해 엘씨디 램프의 구동전류를 소정 주기로 감시하고, 그 감시 결과 정상 범위에서 벗어난 것으로 판명되면 시스템에서 자동으로 보상해 주었다.The LCD module must use a backlight lamp to display the image. Therefore, in the conventional LCD TV, the drive current of the LCD lamp is monitored at a predetermined cycle to ensure stable display operation, and the system automatically compensates if the monitoring current is found to be out of the normal range.
그러나, 종래의 엘씨디 티브이에 있어서는 각 램프의 전류를 각기 검출하는 것이 아니라 램프 전체의 전류를 검출하여 이상 여부를 판단하게 되어 있었다. 따라서, 각 램프 전류가 어떤 편차를 가지고 있는지 알수 없게 되고, 각 편차가 클 경우 인버터 불량을 유발시키게 되는 문제점이 있었다. 더욱이 램프의 전류 편차가 있는 경우 화면의 백색균일성(White Uniformity)이 일정하지 않고 램프에 무리가 가해져 램프의 수명이 단축되는 등의 문제점이 있었다.In the conventional LCD, however, the current of each lamp is not detected, but the current of the entire lamp is detected to determine whether there is an abnormality. Therefore, it is not possible to know what deviation each lamp current has, and if each deviation is large, there is a problem of causing an inverter failure. In addition, when there is a current deviation of the lamp, there is a problem that the white uniformity of the screen is not constant and the lamp is applied to the lamp to shorten the life of the lamp.
따라서, 본 발명의 목적은 각 램프의 구동전류를 각기 체크하여 그 체크 결과에 따라 해당 램프의 구동전류를 자동으로 보상해 주는 엘씨디 티브이의 램프전류 보상회로를 제공함에 있다.Accordingly, an object of the present invention is to provide a lamp current compensation circuit of an LCD that checks the driving current of each lamp individually and automatically compensates the driving current of the corresponding lamp according to the check result.
도 1은 본 발명에 의한 엘씨디 티브이의 램프전류 보상회로의 블록도.1 is a block diagram of an LED lamp current compensation circuit according to the present invention.
도 2는 램프전류 검출부에서의 램프 전류 검출기의 상세 회로도.2 is a detailed circuit diagram of a lamp current detector in the lamp current detector.
도 3은 램프전류 검출부에서의 비교검출부의 상세 회로도.3 is a detailed circuit diagram of a comparison detection unit in a lamp current detection unit.
도 4는 PWM 집적소자부 및 트랜스부의 접속관계를 보인 상세 블록도.4 is a detailed block diagram showing a connection relationship between a PWM integrated device unit and a transformer unit;
***도면의 주요 부분에 대한 부호의 설명****** Description of the symbols for the main parts of the drawings ***
110 : 램프전류 검출부 111A-111D : 전류 검출기110: lamp current detector 111A-111D: current detector
112A,112B : 비교검출부 120 : 마이크로컴퓨터112A, 112B: Comparative detection unit 120: Microcomputer
130 : PWM 집적소자부 131A-131D : PWM 집적소자130: PWM integrated device section 131A-131D: PWM integrated device
140 : 트랜스부 141A-141D : 트랜스140: transformer 141A-141D: trance
150 : 램프부150: lamp unit
도 1은 본 발명에 의한 엘씨디 티브이의 램프전류 보상회로의 일실시 구현예를 보인 블록도로서 이에 도시한 바와 같이, 후광용 램프(LA-LD)에 대한 각각의 피드백 전류를 검출하고, 각각의 검출 결과를 비교하여 그에 상응되는 검출신호를 출력하는 램프전류 검출부(110)와; 상기 램프전류 검출부(110)에서 출력되는 검출신호에 따라 펄스폭 변조신호를 조정하기 위한 제어신호를 출력하는 마이크로컴퓨터(120)와; 상기 마이크로컴퓨터(120)로부터 입력되는 제어신호에 상응되게 펄스폭 변조신호를 각기 조정하여 출력하는 PWM 집적소자부(130)와; 상기 PWM 집적소자부(130)로부터 입력되는 각각의 펄스폭 변조신호에 의해 각각의 트랜스가 구동되어 상기 후광용 램프(LA-LD)에 구동전류를 공급하는 트랜스부(140)와; 상기 트랜스부(140)에서 출력되는 구동전류에 의해 구동되어 엘씨디 모듈의 디스플레이를 위한 후광을 출력하는 램프부(150)로 구성한 것으로, 이와 같이 구성한 본 발명의 작용을 첨부한 도 2 내지 도 4를 참조하여 상세히 설명하면 다음과 같다.Figure 1 is a block diagram showing an embodiment of the LCD current compensation circuit of the LCD according to the present invention, as shown therein, to detect the respective feedback current for the backlight lamp (LA-LD), each A lamp current detection unit 110 comparing the detection results and outputting a detection signal corresponding thereto; A microcomputer (120) for outputting a control signal for adjusting a pulse width modulation signal according to the detection signal output from the lamp current detection unit (110); A PWM integrated device unit (130) for adjusting and outputting a pulse width modulation signal in accordance with a control signal input from the microcomputer (120); A transformer unit 140 driving each transformer by a pulse width modulation signal input from the PWM integrated device unit 130 to supply a driving current to the backlight lamp LA-LD; It is composed of a lamp unit 150 which is driven by the drive current output from the transformer unit 140 to output a halo for the display of the LCD module, Figures 2 to 4 attached to the operation of the present invention configured as described above Detailed description with reference to the following.
티브이의 엘씨디 모듈에는 여러개의 후광용 램프(LA-LD)가 설치되어 있는데, 램프전류 검출부(110)의 전류 검출기(111A-111D)에서는 그들의 피드백 전류를 검출하여 그에 따른 검출전압(VA-VD)을 출력한다.TV backlight module (LA-LD) is installed, the current detector (111A-111D) of the lamp current detector 110 detects their feedback current and accordingly the detection voltage (VA-VD) Outputs
또한, 상기 램프전류 검출부(110)에서 비교검출부(112A),(112B)의 비교기(CP1),(CP2)는 상기 검출전압(VA,VB),(VC,VD)을 비교하여 그에 따른 정보를 마이크로컴퓨터(120)에 출력한다. 예를 들어, 상기 비교기(CP1)는 상기검출전압(VA,VB)을 비교하여 검출전압(VA)이 더 높으면 "로우" 신호를 출력하고, 검출전압(VB)이 더 높으면 "하이" 신호를 출력하며, 그들의 차값이 일정치(예: +- 0.5%) 이하이면 "제로" 신호를 출력한다.Also, the comparators CP1 and CP2 of the comparison detection units 112A and 112B in the lamp current detection unit 110 compare the detection voltages VA, VB, and VC and VD to obtain corresponding information. Output to the microcomputer 120. For example, the comparator CP1 compares the detection voltages VA and VB and outputs a "low" signal when the detection voltage VA is higher, and outputs a "high" signal when the detection voltage VB is higher. If the difference is less than a certain value (eg + -0.5%), a " zero " signal is output.
상기 마이크로컴퓨터(120)는 상기 램프전류 검출부(110)의 비교기(CP1),(CP2)로부터 입력되는 상기와 같은 정보를 근거로 하여, PWM 집적소자부(130)의 PWM 집적소자(131A-131D) 중에서 해당 PWM 집적소자의 펄스폭 변조신호 출력을 조정하게 된다.The microcomputer 120 based on the above information input from the comparators CP1 and CP2 of the lamp current detection unit 110, and the PWM integrated elements 131A-131D of the PWM integrated element unit 130. ), The pulse width modulated signal output of the corresponding PWM integrated device is adjusted.
이에 따라, 트랜스(141A-141D) 중에서 해당 트랜스의 스위칭 주파수가 조정되고, 이에 의해 상기 램프(LA-LD) 중에서 해당 램프의 구동전류가 보상된다. 따라서, 사용자가 별다른 조치를 취하지 않는 경우에도 상기 램프(LA-LD)가 항상 정상적인 조도를 유지할 수 있게 된다.Accordingly, the switching frequency of the transformer among the transformers 141A to 141D is adjusted, thereby compensating for the driving current of the lamp among the lamps LA-LD. Therefore, even when the user does not take any action, the lamp LA-LD can always maintain normal illuminance.
이상에서 상세히 설명한 바와 같이 본 발명은 각 램프의 구동전류를 각기 체크하여 그 체크 결과에 따라 해당 램프의 구동전류를 자동으로 보상해 줌으로써, 각 램프전류간의 편차가 줄어들어 인버터가 안정되게 구동되고 화면의 백색균일성이 보장되어 램프의 수명이 연장되는 등의 효과가 있었다.As described in detail above, the present invention checks the driving current of each lamp and automatically compensates the driving current of the corresponding lamp according to the check result, so that the deviation between each lamp current is reduced and the inverter is driven stably and the screen White uniformity was ensured, such that the life of the lamp was extended.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| KR10-2002-0025938A KR100464047B1 (en) | 2002-05-10 | 2002-05-10 | Compensation circuit for lamp current of liquid crystal display tv |
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| KR10-2002-0025938A KR100464047B1 (en) | 2002-05-10 | 2002-05-10 | Compensation circuit for lamp current of liquid crystal display tv |
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| KR20030087856A KR20030087856A (en) | 2003-11-15 |
| KR100464047B1 true KR100464047B1 (en) | 2005-01-03 |
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| KR10-2002-0025938A Expired - Fee Related KR100464047B1 (en) | 2002-05-10 | 2002-05-10 | Compensation circuit for lamp current of liquid crystal display tv |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100659531B1 (en) * | 2003-11-27 | 2006-12-19 | 삼성에스디아이 주식회사 | Backlight driving circuit |
| KR100658674B1 (en) * | 2004-08-05 | 2006-12-15 | 삼성에스디아이 주식회사 | Backlight driving circuit |
| KR100677568B1 (en) | 2005-02-07 | 2007-02-02 | 삼성전자주식회사 | Method for Determining Transmission Rate of Control Response Frame for Data Reception on WLAN |
| KR100691630B1 (en) * | 2006-04-25 | 2007-03-12 | 삼성전기주식회사 | Detection of LC backlight drive using true-balancing loop |
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| JPH09148083A (en) * | 1995-11-21 | 1997-06-06 | Murata Mfg Co Ltd | Cold-cathode tube driving device |
| JPH09180889A (en) * | 1995-12-25 | 1997-07-11 | Murata Mfg Co Ltd | Cold cathode tube lighting device |
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