KR100686070B1 - Method and apparatus of controlling brightness in display - Google Patents

Method and apparatus of controlling brightness in display Download PDF

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KR100686070B1
KR100686070B1 KR1020040082959A KR20040082959A KR100686070B1 KR 100686070 B1 KR100686070 B1 KR 100686070B1 KR 1020040082959 A KR1020040082959 A KR 1020040082959A KR 20040082959 A KR20040082959 A KR 20040082959A KR 100686070 B1 KR100686070 B1 KR 100686070B1
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lamp
dmd
section
image display
display device
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KR1020040082959A
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Korean (ko)
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KR20060034329A (en
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이정균
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엘지전자 주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
    • G02B26/0833—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2053—Intensity control of illuminating light
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/57—Control of contrast or brightness

Abstract

본 발명에 따른 투사형 영상표시기기의 밝기조정방법은, 상기 투사형 영상표시기기의 램프를 디밍하는 단계와, 상기 램프 디밍에 의한 램프구동신호의 변형에 대응되게 영상신호를 표시하기 위한 DMD 개폐정도를 가변하는 단계를 포함하고, 특히 상기 방법은 상기 램프 디밍에 의한 RGB 구간의 레벨과 램프구동신호의 ND 구간의 레벨간의 비율의 변화량에 대응되게 상기 ND 구간에 대한 DMD 개폐정도를 가변하는 단계를 포함하는 것을 특징으로 한다. The brightness adjustment method of the projection image display device according to the present invention includes the steps of dimming the lamp of the projection image display device, and the degree of DMD opening and closing for displaying an image signal corresponding to the deformation of the lamp driving signal by the lamp dimming. In particular, the method includes varying the degree of DMD opening and closing for the ND interval corresponding to the amount of change in the ratio between the level of the RGB interval and the level of the ND interval of the lamp driving signal by the lamp dimming Characterized in that.

그리고, 본 발명에 따른 투사형 영상표시기기의 밝기조정장치는, 램프와, 램프제어회로와, VDP와, DMD와, DMD 제어부와, 제어부를 포함하고, 상기 제어부는, 상기 램프 디밍에 의한 RGB 구간의 레벨과 램프구동신호의 ND 구간의 레벨간의 비율의 변화량에 대응되게 상기 ND 구간에 대한 DMD 개폐정도를 가변함을 특징으로 한다. The brightness adjusting device of the projection image display device according to the present invention includes a lamp, a lamp control circuit, a VDP, a DMD, a DMD controller, and a controller, wherein the controller comprises: an RGB section by the lamp dimming. The DMD opening and closing degree of the ND section may be varied to correspond to the amount of change in the ratio between the level of the ramp driving signal and the level of the ND section of the lamp driving signal.

컬러 휠, 디밍Color wheel, dimming

Description

영상표시기기의 밝기조정방법 및 장치{METHOD AND APPARATUS OF CONTROLLING BRIGHTNESS IN DISPLAY}Method and device for adjusting brightness of image display device {METHOD AND APPARATUS OF CONTROLLING BRIGHTNESS IN DISPLAY}

도 1은 램프구동신호의 파형도.1 is a waveform diagram of a lamp driving signal.

도 2는 본 발명의 바람직한 실시예에 따른 영상표시장치의 개략적인 구성도. 2 is a schematic structural diagram of an image display apparatus according to a preferred embodiment of the present invention;

도 3은 본 발명의 바람직한 실시예에 따른 밝기조정방법의 흐름도. 3 is a flow chart of a brightness adjustment method according to a preferred embodiment of the present invention.

* 도면의 주요부분에 대한 설명 *Description of the main parts of the drawing

200 : 제어부200: control unit

202 : 램프제어회로202: lamp control circuit

204 : 램프204 lamp

206 : VDP206: VDP

208 : DMD 제어부208: DMD control unit

210 : DMD210: DMD

본 발명은 투사형 영상표시기기에 관한 것으로, 특히 투사형 영상표시기기의 밝기 조정방법 및 장치에 관한 것이다. The present invention relates to a projection image display device, and more particularly to a method and apparatus for adjusting brightness of a projection image display device.

일반적으로 투사형 영상표시기기는 VDP(VIDEO DATA PROCESSOR)의 밝기값을 변경함으로써 밝기를 조정한다.  In general, the projection type video display device adjusts the brightness by changing the brightness value of the VDP (VIDEO DATA PROCESSOR).

그러나 광원에서 출사되는 광은 그대로 유지한채 비디오 데이터의 밝기를 조정하는 것은 램프 수명과 콘트라스트 비율에 비효율적이며 밝기값에 따라 광원의 광량을 줄이는 램프 디밍(DIMMING) 기술이 제안되고 있다. However, adjusting the brightness of video data while maintaining the light emitted from the light source is inefficient in lamp life and contrast ratio, and a lamp dimming technique for reducing the amount of light of the light source according to the brightness value has been proposed.

상기한 램프 디밍 기술에 따라 램프의 광량을 조절하는 경우에는, 램프구동펄스의 RGB 구간의 크기만 변경되고 ND 구간은 그 크기가 유지된다. When the amount of light of the lamp is adjusted according to the lamp dimming technique described above, only the size of the RGB section of the lamp driving pulse is changed and the size of the ND section is maintained.

이에따라 상기 램프 디밍 기술에 따라 램프의 광량을 조절하는 경우에, 상기 램프구동펄스의 RGB 구간의 크기와 ND 구간간의 크기간의 비가 맞지 않았으며, 그 결과 휘도 레벨이 비선형적으로 표현되었다. Accordingly, in the case of adjusting the light amount of the lamp according to the lamp dimming technique, the ratio between the size of the RGB section of the lamp driving pulse and the size between the ND section does not match, and as a result, the luminance level is represented nonlinearly.

이에따라 종래에는 상기 램프 디밍에 의한 램프 광량 조절에 의해 휘도 레벨이 비선형적으로 표현되던 문제를 해소할 수 있는 기술의 개발이 절실하게 요망되었다. Accordingly, in the related art, there is an urgent need for the development of a technology that can solve the problem of the luminance level being expressed non-linearly by adjusting the lamp light amount by the lamp dimming.

따라서 본 발명의 목적은 램프 디밍에 의한 램프 광량 조절에 의해 휘도 레벨이 비선형적으로 표현되던 문제를 해결하기 위한 투사형 영상표시기기의 밝기조정방법 및 장치를 제공함에 있다. Accordingly, an object of the present invention is to provide a method and apparatus for adjusting brightness of a projection image display device to solve the problem that the luminance level is nonlinearly expressed by adjusting the lamp light amount by lamp dimming.

상기한 목적을 달성하기 위한 본 발명에 따르는 투사형 영상표시기기의 밝기조정방법은, 상기 투사형 영상표시기기의 램프를 디밍하는 단계와, 상기 램프 디밍 에 의한 램프구동신호의 변형에 대응되게 영상신호를 표시하기 위한 DMD 개폐정도를 가변하는 단계로 구성됨을 특징으로 한다. According to an aspect of the present invention, there is provided a method of adjusting a brightness of a projection image display device, the method including dimming a lamp of the projection image display device and corresponding to a deformation of a lamp driving signal by the lamp dimming. And varying the degree of DMD opening and closing for displaying.

특히 상기 방법은 상기 램프 디밍에 의한 RGB 구간의 레벨과 램프구동신호의 ND 구간의 레벨간의 비율의 변화량에 대응되게 상기 ND 구간에 대한 DMD 개폐정도를 가변하는 단계로 구성됨을 특징으로 한다. In particular, the method is characterized in that it comprises a step of varying the DMD opening and closing degree for the ND section corresponding to the amount of change in the ratio between the level of the RGB section by the lamp dimming and the level of the ND section of the lamp driving signal.

그리고 본 발명에 따르는 투사형 영상표시기기의 밝기조정장치는, 광을 발광하는 램프와, 램프를 구동하는 램프제어회로와, 상기 비디오 데이터를 처리하는 VDP와, 상기 램프가 발광하는 광을 반사하는 DMD와, 상기 VDP가 출력하는 비디오 데이터에 대응되게 상기 DMD를 개폐하는 DMD 제어부와, 상기 투사형 영상표시기기의 밝기조정을 위해 상기 램프를 디밍하도록 램프구동신호를 조정하도록 상기 램프제어회로를 제어함과 아울러, 상기 램프 디밍에 의한 램프구동신호의 변형에 대응되게 영상신호를 표시하기 위한 DMD 개폐정도를 가변하도록 상기 DMD 제어부를 제어하는 제어부로 구성됨을 특징으로 한다. The brightness adjusting device of the projection image display device according to the present invention includes a lamp for emitting light, a lamp control circuit for driving the lamp, a VDP for processing the video data, and a DMD for reflecting light emitted by the lamp. And a DMD controller for opening and closing the DMD corresponding to the video data output from the VDP, and controlling the lamp control circuit to adjust a lamp driving signal to dimm the lamp for adjusting the brightness of the projection image display device. In addition, the control unit for controlling the DMD control unit to vary the degree of opening and closing the DMD for displaying the video signal corresponding to the deformation of the lamp driving signal by the lamp dimming.

특히 상기 제어부는, 상기 램프 디밍에 의한 RGB 구간의 레벨과 램프구동신호의 ND 구간의 레벨간의 비율의 변화량에 대응되게 상기 ND 구간에 대한 DMD 개폐정도를 가변함을 특징으로 한다. In particular, the control unit may vary the degree of DMD opening and closing for the ND section to correspond to the amount of change in the ratio between the level of the RGB section by the lamp dimming and the level of the ND section of the lamp driving signal.

도 1은 램프구동신호를 도시한 것으로, RGB 구간(A)의 램프구동신호의 레벨은 ND 구간(B)의 램프구동신호의 레벨보다 높으며, 상기 RGB 구간의 램프구동신호의 레벨은 ND 구간의 램프구동신호의 레벨의 비율이 일정하게 유지되어야 휘도레벨이 선형적으로 표현된다. 1 illustrates a lamp driving signal, wherein the level of the lamp driving signal in the RGB section A is higher than the level of the lamp driving signal in the ND section B, and the level of the lamp driving signal in the RGB section is equal to that of the ND section. The luminance level is expressed linearly only when the ratio of the level of the lamp driving signal is kept constant.

도 2는 본 발명의 바람직한 실시예에 따른 영상표시기기의 개략적인 구성도이다. 2 is a schematic structural diagram of an image display apparatus according to an exemplary embodiment of the present invention.

상기 영상표시기기의 제어부(200)는 상기 영상표시기기를 전반적으로 제어함은 물론이며, 본 발명의 바람직한 실시예에 따라 DMD(210)를 조절한다. The controller 200 of the image display device not only controls the image display device as a whole, but also adjusts the DMD 210 according to a preferred embodiment of the present invention.

램프제어회로(202)는 상기 제어부(200)의 제어에 따라 램프구동신호의 레벨을 디밍함으로써 램프(204)의 광량을 조절한다. The lamp control circuit 202 adjusts the amount of light of the lamp 204 by dimming the level of the lamp driving signal under the control of the controller 200.

상기 램프(204)는 상기 램프제어회로(202)가 제공하는 램프구동신호에 의거한 광을 발광한다. The lamp 204 emits light based on the lamp driving signal provided by the lamp control circuit 202.

VDP(206)는 영상신호를 처리하여 DMD(210)를 개폐함으로써 컬러휠을 투과한 광을 반사시켜 영상을 형성한다. 또한 상기 VDP(206)는 제어부(200)의 제어에 따라 상기 DMD(210)의 개폐를 조절한다. The VDP 206 processes the image signal to open and close the DMD 210 to reflect the light transmitted through the color wheel to form an image. In addition, the VDP 206 controls the opening and closing of the DMD 210 under the control of the controller 200.

DMD 제어부(208)는 상기 VDP(206)가 제공하는 영상데이터에 대응되게 DMD(210)를 개폐한다. The DMD controller 208 opens and closes the DMD 210 to correspond to the image data provided by the VDP 206.

상기한 영상표시기기에 적용가능한 본 발명의 바람직한 실시예에 따른 밝기조정방법을 도 3의 흐름도를 참조하여 설명한다. A brightness adjusting method according to a preferred embodiment of the present invention applicable to the image display apparatus will be described with reference to the flowchart of FIG. 3.

상기 제어부(200)는 밝기조정이 요청되는지를 체크한다(300단계). 상기 제어부(200)는 밝기조정이 요청되면, 그 밝기조정요청에 따라 램프구동신호를 조정하도록 램프제어회로(202)를 제어한다(302단계).The control unit 200 checks whether the brightness adjustment is requested (step 300). When the brightness adjustment is requested, the control unit 200 controls the lamp control circuit 202 to adjust the lamp driving signal according to the brightness adjustment request (step 302).

이후 상기 제어부(100)는 상기 밝기조정요청에 따라 ND 구간의 DMD 개폐비율을 조정하며, 상기 DMD 개폐비율은 수학식 1에 따라 산출된다. Thereafter, the controller 100 adjusts the DMD opening and closing ratio of the ND section according to the brightness adjustment request, and the DMD opening and closing ratio is calculated according to Equation 1.

PPR = (ND구간의 전류치)/(RGB 구간의 전류)PPR = (current value in ND section) / (current in RGB section)

ND 구간과 RGB 구간간의 비율 = (N-6)*8+100/100Ratio between ND and RGB intervals = (N-6) * 8 + 100/100

ND 구간의 퍼센티지 = (ND 블랙)/(그린 블랙)Percentage of ND interval = (ND Black) / (Green Black)

DMD 개폐비율 조정값 = ND 구간의 퍼센티지 *PPRDMD open / close ratio adjustment value = percentage of ND interval * PPR

상술한 바와 같이 본 발명은 램프디밍에 의해 RGB 구간의 램프구동신호의 레벨과 ND 구간의 램프구동신호의 레벨간의 가변된 비율을 비디오 데이터를 통해 보정한다. As described above, according to the present invention, the variable ratio between the level of the lamp driving signal in the RGB section and the level of the lamp driving signal in the ND section is corrected through the video data by lamp dimming.

상술한 바와 같이 본 발명은 램프디밍에 의해 RGB 구간의 램프구동신호의 레벨과 ND 구간의 램프구동신호의 레벨간의 가변된 비율을 비디오 데이터를 통해 보정함으로써, 램프 디밍에 의한 램프 광량 조절에 의해 휘도 레벨이 비선형적으로 표현되던 문제를 해결할 수 있는 이점이 있다. As described above, the present invention corrects the variable ratio between the level of the lamp driving signal in the RGB section and the level of the lamp driving signal in the ND section through the video data by lamp dimming, thereby adjusting the luminance by controlling the amount of lamp light by the lamp dimming. This has the advantage of solving the problem of the level being expressed nonlinearly.

Claims (4)

투사형 영상표시기기의 밝기조정방법에 있어서,In the brightness adjustment method of the projection image display device, 상기 투사형 영상표시기기의 램프를 디밍하는 단계와, Dimming a lamp of the projection image display device; 상기 램프 디밍에 의한 RGB 구간의 레벨과, 램프구동신호의 ND 구간의 레벨간의 비율의 변화량에 대응되게 상기 ND 구간에 대한 DMD 개폐비율을 가변하는 단계로 구성됨을 특징으로 하는 투사형 영상표시기기의 밝기조정방법. And varying the DMD opening and closing ratio for the ND section in correspondence to the amount of change in the ratio between the level of the RGB section by the lamp dimming and the level of the ND section of the lamp driving signal. How to adjust. 제1항에 있어서, The method of claim 1, 상기 DMD 개폐비율은, The DMD opening and closing ratio is, " PPR = (ND구간의 전류치)/(RGB 구간의 전류),"PPR = (current value in ND section) / (current in RGB section), ND 구간과 RGB 구간간의 비율 = (N-6)*8+100/100,Ratio between ND and RGB intervals = (N-6) * 8 + 100/100, ND 구간의 퍼센티지 = (ND 블랙)/(그린 블랙),Percentage of ND interval = (ND black) / (green black), DMD 개폐비율 조정값 = ND 구간의 퍼센티지 * PPR "DMD opening / closing ratio adjustment value = percentage of ND interval * PPR " 로 산출되는 것을 특징으로 하는 투사형 영상표시기기의 밝기조정방법. Method for adjusting the brightness of the projection image display device, characterized in that calculated by. 투사형 영상표시기기의 밝기조정장치에 있어서, In the brightness adjustment device of the projection image display device, 광을 발광하는 램프와, A lamp that emits light, 램프를 구동하는 램프제어회로와, A lamp control circuit for driving a lamp, 상기 비디오 데이터를 처리하는 VDP와, A VDP for processing the video data; 상기 램프가 발광하는 광을 반사하는 DMD와, A DMD reflecting light emitted by the lamp; 상기 VDP가 출력하는 비디오 데이터에 대응되게 상기 DMD를 개폐하는 DMD 제어부와, A DMD controller configured to open and close the DMD corresponding to the video data output from the VDP; 상기 투사형 영상표시기기의 밝기조정을 위해 상기 램프를 디밍하도록 램프구동신호를 조정하도록 상기 램프제어회로를 제어함과 아울러, 상기 램프 디밍에 의한 RGB 구간의 레벨과 램프구동신호의 ND 구간의 레벨간의 비율의 변화량에 대응되게 상기 ND 구간에 대한 DMD 개폐비율을 가변하도록 상기 DMD 제어부를 제어하는 제어부로 구성됨을 특징으로 하는 투사형 영상표시기기의 밝기조정장치.The lamp control circuit is controlled to adjust a lamp driving signal to dimm the lamp for adjusting the brightness of the projection image display device, and between the level of the RGB section by the lamp dimming and the level of the ND section of the lamp driving signal. And a controller for controlling the DMD controller to vary the DMD opening / closing ratio for the ND section to correspond to a change amount of the ratio. 제3항에 있어서, The method of claim 3, 상기 DMD 개폐비율은, The DMD opening and closing ratio is, " PPR = (ND구간의 전류치)/(RGB 구간의 전류),"PPR = (current value in ND section) / (current in RGB section), ND 구간과 RGB 구간간의 비율 = (N-6)*8+100/100,Ratio between ND and RGB intervals = (N-6) * 8 + 100/100, ND 구간의 퍼센티지 = (ND 블랙)/(그린 블랙),Percentage of ND interval = (ND black) / (green black), DMD 개폐비율 조정값 = ND 구간의 퍼센티지 * PPR "DMD opening / closing ratio adjustment value = percentage of ND interval * PPR " 로 산출되는 것을 특징으로 하는 투사형 영상표시기기의 밝기조정장치.Brightness adjusting device of the projection image display device, characterized in that calculated by.
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JP2003121926A (en) 2001-10-12 2003-04-23 Seiko Epson Corp Projection type display device and its driving method
JP2003186107A (en) 2001-12-17 2003-07-03 Seiko Epson Corp Projection display device and driving method therefor
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JP2004085961A (en) 2002-08-28 2004-03-18 Seiko Epson Corp Display apparatus
JP2004163518A (en) 2002-11-11 2004-06-10 Seiko Epson Corp Device and method for image display
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Publication number Priority date Publication date Assignee Title
JP2003121926A (en) 2001-10-12 2003-04-23 Seiko Epson Corp Projection type display device and its driving method
JP2003186107A (en) 2001-12-17 2003-07-03 Seiko Epson Corp Projection display device and driving method therefor
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