KR0139179B1 - One panel lcd projector - Google Patents

One panel lcd projector

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Publication number
KR0139179B1
KR0139179B1 KR1019930010242A KR930010242A KR0139179B1 KR 0139179 B1 KR0139179 B1 KR 0139179B1 KR 1019930010242 A KR1019930010242 A KR 1019930010242A KR 930010242 A KR930010242 A KR 930010242A KR 0139179 B1 KR0139179 B1 KR 0139179B1
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KR
South Korea
Prior art keywords
light
color
liquid crystal
color correction
crystal projector
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Application number
KR1019930010242A
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Korean (ko)
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KR950001338A (en
Inventor
이훈영
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김광호
삼성전자주식회사
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Priority to KR1019930010242A priority Critical patent/KR0139179B1/en
Publication of KR950001338A publication Critical patent/KR950001338A/en
Application granted granted Critical
Publication of KR0139179B1 publication Critical patent/KR0139179B1/en

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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
    • 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
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • 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]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H04N9/3105—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Projection Apparatus (AREA)

Abstract

본 발명의 단패널식 액정프로젝터는 액정에 의해 광강도 변조할려는, 파장대역의 색상광들과 다른 색상광들의 광투과율을 다르게 설정한 색보정핫미러를 사용하므로써 광원의 광스펙트럼에 의해 결정되는 투과광의 색을 변화시킨다. 따라서, 색온도를 향상시켜 액정패널에 입사하는 광이 백색광에 가깝게 될뿐만 아니라, 화면에 현시되는 화상의 화질을 향상시키는 효과를 가져온다.The single-panel liquid crystal projector of the present invention is determined by the light spectrum of the light source by using a color correction hot mirror which sets the light transmittance of the color light of the wavelength band and the other color light differently to modulate the light intensity by the liquid crystal. The color of the transmitted light is changed. Therefore, the light incident on the liquid crystal panel by improving the color temperature is not only close to the white light, but also the effect of improving the image quality of the image displayed on the screen.

Description

단패널식 액정프로젝터Single Panel Liquid Crystal Projector

제1도는 일반적인 메탈할라이드램프의 광스펙트럼,1 is a light spectrum of a typical metal halide lamp,

제2도는 핫미러(Hot Mirror) 및 메탈할라이드램프의 광스펙트럼,2 shows the light spectrum of the hot mirror and the metal halide lamp,

제3도는 일반적인 단패널식 액정프로젝터의 개략도,3 is a schematic view of a typical single-panel liquid crystal projector,

제4도는 CIE색도도이다.4 is a CIE chromaticity diagram.

*도면의 주요부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *

10: 메탈할라이드램프11: 색보정핫미러10: metal halide lamp 11: color correction hot mirror

13: 편광자14: 액정패널13: polarizer 14: liquid crystal panel

15: 투사렌즈16: 화면15: Projection Lens 16: Screen

본 발명은 단패널식 액정프로젝터에 관한 것으로서, 영상신호가 인가되는 액정패널에 의해 광강도 변조되는 투사광을 이용하여 화면상에 표시하는 액정프로젝터에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a short panel liquid crystal projector, and more particularly, to a liquid crystal projector displayed on a screen by using projection light whose intensity is modulated by a liquid crystal panel to which an image signal is applied.

인공적인 광원은 자연광과 마찬가지로 적외선과 가시광선등을 포함하는 광스펙트럼을 갖는다. 따라서, 액정프로젝터는 인공광원으로부터 투사되는 광중에서 원하는 파장대역인 가시광선만을 선택적으로 투과시키기 위해 색필터(color filter)인 핫미러(Hot Mirror)를 이용한다.Artificial light sources, like natural light, have a light spectrum that includes infrared light and visible light. Accordingly, the liquid crystal projector uses a hot mirror, which is a color filter, to selectively transmit only visible light, which is a desired wavelength band, among light projected from an artificial light source.

제1도는 일반적인 메탈할라이드램프의 광스펙트럼을 나타낸다. 제1도에서 가로축은 nm단위의 파장을 나타내고, 세로축은 메탈할라이드램프에 의해 발생하는 광의 각 파장에 대응하는 광강도의 분포를 보여준다.1 shows the light spectrum of a typical metal halide lamp. In FIG. 1, the horizontal axis represents wavelength in nm, and the vertical axis represents distribution of light intensity corresponding to each wavelength of light generated by the metal halide lamp.

제2도는 핫미러의 투과율과 메탈할라이드램프의 광스펙트럼을 나타낸 것이다. 제2도의 가로축은 nm단위의 파장으로 표시되고, 그 세로축은 광원으로부터 투사되는 광의 강도 또는 광투과율을 나타낸 것이다. 제2도에서, “A”와 “B”및 “C”는 동일한 파장대역에 대한 광스펙트럼을 보여주는 것이나, 스펙트럼 “B”는 광강도로 표시되는 반면 스펙트럼 “A”와 “C”는 광투과율을 보여준다. 단패널식 액정프로젝터에 제2도의 광투과특성 “A”를 갖는 색보정필터를 사용하면, 색보정필터는 메탈할라이드 램프로부터 투사되는 광중에서 약 400nm부터 700nm정도까지의 파장대역을 갖는 가시광선만을 선택적으로 투과시킨다.2 shows the transmittance of the hot mirror and the light spectrum of the metal halide lamp. The horizontal axis of FIG. 2 is represented by the wavelength in nm, and the vertical axis represents the intensity or light transmittance of the light projected from the light source. In Fig. 2, “A”, “B” and “C” show the light spectrum for the same wavelength band, but the spectrum “B” is expressed in light intensity while the spectra “A” and “C” are light transmittance. Shows. When the color correction filter having the light transmittance “A” of FIG. 2 is used for a single panel liquid crystal projector, the color correction filter only displays visible light having a wavelength band of about 400 nm to 700 nm in the light projected from the metal halide lamp. Selectively permeate.

제2도의 광투과특성 “A”를 갖는 종래의 색보정필터는 전체 가시광선대역에 대해 동일한 광투과율을 가지므로, 액정프로젝터에 의해 화면상에 현시되는 화상의 색상은 메탈할라이드램프에서 발생되는 광의 색에 의존한다. 따라서, 광원에 의해 발생되는 광의 색이 나쁘면 액정프로젝터에 의해 화면상에 현시되는 화상의 색 역시 나빠지는 문제가 있다.Since the conventional color correction filter having the light transmittance “A” of FIG. 2 has the same light transmittance for the entire visible light band, the color of the image displayed on the screen by the liquid crystal projector is the color of light generated by the metal halide lamp. Depends on color Therefore, when the color of light generated by the light source is bad, the color of the image displayed on the screen by the liquid crystal projector is also bad.

상술의 문제점을 해결하기 위한 본 발명의 목적은 가시광선만을 투과시키는 핫미러에 파장대역에 따라 광투과특성이 다른 색필터(color filter)기능을 추가하므로써 광원에 의해 결정되는 광의 색을 개선할 수 있는 액정프로젝터를 제공함에 있다.An object of the present invention for solving the above problems is to improve the color of the light determined by the light source by adding a color filter function having different light transmission characteristics depending on the wavelength band to the hot mirror that transmits only visible light. The present invention provides a liquid crystal projector.

이와같은 본 발명의 목적은, 파장대역에 따라 광강도를 달리하는 스펙트럼을 갖는 광원과, 광원으로부터 투사되는 광에 영상신호를 인가하기 위한 액정을 갖는 액정프로젝터에 있어서, 상기 광원과 액정사이에 위치하고, 파장에 따라 투과율을 달리하는 광투과특성을 갖는 색보정필터를 포함하는 단패널식 액정프로젝터에 의해 달성된다.An object of the present invention is to provide a liquid crystal projector having a light source having a spectrum of varying light intensity according to a wavelength band and a liquid crystal projector for applying an image signal to light projected from the light source. The present invention is accomplished by a single-panel liquid crystal projector including a color correction filter having a light transmission characteristic of varying the transmittance according to the wavelength.

이하, 본 발명을 구현한 바람직한 일 실시예를 첨부된 도면을 참조하여 상세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

제3도는 일반적인 단패널식 액정프로젝터의 개략적인 구성을 나타낸 것이다. 제3도의 단패널식 액정프로젝터는 제2도의 광스펙트럼 “B”를 갖는 메탈할라이드램프(10)와, 제2도의 광투과특성 “C”를 가지고 파장에 따라 각 색상광의 광투과정도를 달리하는 색필터기능을 갖는 핫미러(이하, “색보정핫미러”라함)(11)와, 투과광을 광강도변조시키는 액정패널(14)을 구비한다. 그리고, 액정패널(14)의 앞과 뒤에는 액정패널의 광강도변조를 보조하는 편광자(13)가 설치되고, 편광자(13)의 화면(16) 사이에는 투과광의 초점조절을 위한 투사렌즈(115)가 위치한다. 메탈할라이드램프(10)로부터 투사되는 광은 색보정핫미러(11)의 광투과특성에 의해 선택적으로 투과된다. 색보정핫미러(11)에 의해 광강도가 조절되는 것은 추후 설명한다. 색보정핫미러(11)를 투과한 광은 편광자(13)와 편광된 후 액정패널(14)로 입사한다. 액정패널(12)에 의해 광강도변조된 투과광은 투사렌즈(15)에 의해 화면(16)상에 영상으로 현시된다.3 shows a schematic configuration of a typical single-panel liquid crystal projector. The single-panel liquid crystal projector of FIG. 3 has a metal halide lamp 10 having a light spectrum “B” of FIG. 2 and a light transmission characteristic of each color light depending on the wavelength with the light transmission characteristic “C” of FIG. A hot mirror (hereinafter referred to as "color correction hot mirror") 11 having a color filter function and a liquid crystal panel 14 for modulating the transmitted light intensity are provided. Then, the front and rear of the liquid crystal panel 14 is provided with a polarizer 13 to assist the light intensity modulation of the liquid crystal panel, between the screen 16 of the polarizer 13, the projection lens 115 for focusing the transmitted light Is located. Light projected from the metal halide lamp 10 is selectively transmitted by the light transmission characteristic of the color correction hot mirror 11. The adjustment of the light intensity by the color correction hot mirror 11 will be described later. The light transmitted through the color correction hot mirror 11 is incident to the liquid crystal panel 14 after being polarized with the polarizer 13. The transmitted light modulated with the light intensity by the liquid crystal panel 12 is displayed as an image on the screen 16 by the projection lens 15.

메탈할라이드램프(10)로부터 발생하며 제2도의 광스펙트럼 “B”를 갖는 투사광은 색보정핫미러(11)에 의해 파장에 따라 광강도가 변화된다. 480∼510nm정도의 파장대역을 갖는 청색광, 520∼560nm정도의 녹색광, 610∼650nm정도의 적색광처럼 광투과율이 높은 파장대역에 속하는 색상광은 색보정핫미러(11)에 의해 광강도가 약해지는 정도가 작다. 반면에, 약 450nm의 파장을 갖는 색상광처럼 색보정필터의 투과율이 낮은 파장대역에 속하는 색상광은 색보정핫미러를 투과하면서 상대적으로 광강도가 약해진다. 따라서, 액정패널(14)은 색보정핫미러(11)에 의해 광강도가 변경된 색상광들을 입사받게 된다. 그 결과, 화면에 현시되는 화상의 화질은 광원에 의해 제한되지 않게 되므로, 화상의 화질은 색보정필터의 광투과특성의 조절에 의해 향상된다. 색보정핫미러의 광투과특성조절에 의한 이점을 제4도를 이용하여 보다 상세히 설명한다.The projection light generated from the metal halide lamp 10 and having the light spectrum “B” in FIG. 2 is changed by the color correction hot mirror 11 according to the wavelength. Color light belonging to a wavelength range with high light transmittance such as blue light having a wavelength band of about 480 to 510 nm, green light of about 520 to 560 nm, and red light of about 610 to 650 nm is weakened by the color correction hot mirror 11. The degree is small. On the other hand, color light belonging to a wavelength band having a low transmittance of the color correction filter, such as color light having a wavelength of about 450 nm, transmits the color correction hot mirror and is relatively weak in light intensity. Therefore, the liquid crystal panel 14 receives the color lights whose light intensity is changed by the color correction hot mirror 11. As a result, since the image quality of the image displayed on the screen is not limited by the light source, the image quality of the image is improved by adjusting the light transmission characteristics of the color correction filter. Advantages of the light transmission characteristics of the color correction hot mirror will be described in more detail with reference to FIG. 4.

제4도는 CIE 색도도(chromaticity diagram)이다. 제4도에서, A1은 메탈할라이드램프(10)와 종래의 핫미러를 이용하는 경우의 CIE 색좌표이며, B1은 메탈할라이드램프(10)에 의한 CIE색좌표이다. 그리고, C1은 램프(10)와 본 발명에 의한 색보정핫미러(11)를 이용하는 경우의 CIE색좌표이다. 일반적인 광원은 광원의 온도를 상승시키면 백색광에 가까운 광을 복사한다. 이것을 CIE색도도상에 나타내면 제4도의 흑체궤적(Blackbody Curve)(BC)으로 표시된다. 소정 색의 색도가 흑체궤적(BC)상에 존재하면 그 색은 완전방사체(ideal radiator)의 온도인 “색온도”로 나타낼 수 있다. 제2도의 광스펙트럼 “B”를 갖는 메탈할라이드램프를 광원으로 사용하는 경우, 메탈할라이드램프(10)로부터 복사되는 광은 소정 조건하에서 그 색좌표가 X=0.335 Y=0.390이 된다. 동일한 조건하에서 제2도의 광투과특성 “A”를 갖는 종래의 핫미러는 그 색좌표가 X=0.337 Y=0.395인 광을 방출한다. 그리고, 동일 조건하에서 제2도의 광투과특성 “C”를 갖는 색보정핫미러는 그 색좌표가 X=0.324 Y=0.374인 광을 복사한다. 상술의 색좌표들은 제4도의 흑체궤적 주변에서 제2도의 광스펙트럼들에 대응하는 영문자로 표시되어 있다. 제4도에서 알 수 있는 바와같이 종래 핫미러의 색좌표 “A”보다 본 발명의 일 실시예에서 이용한 색보정핫미러의 색좌표 “C”가 흑체궤적에 가깝게 위치한다. 즉, 동일한 메탈할라이드램프에 대해 본 발명의 일 실시예는 종래의 경우보다 높은 색온도를 제공한다. 결과적으로, 동일한 광원에 대해 백색광에 가까운 광의 복사가 가능하므로, 본 발명의 색보정핫미러를 이용하는 단패널식 액정프로젝터는 액정패널에 의해 광강도 변조되어 화면상에 현시되는 화상의 화질을 향상시킨다.4 is a CIE chromaticity diagram. In FIG. 4, A 1 is a CIE color coordinate when the metal halide lamp 10 and a conventional hot mirror are used, and B 1 is a CIE color coordinate by the metal halide lamp 10. In FIG. C 1 is a CIE color coordinate when the lamp 10 and the color correction hot mirror 11 according to the present invention are used. A general light source emits light close to white light when the temperature of the light source is raised. When this is shown on the CIE chromaticity diagram, it is represented by the blackbody curve BC of FIG. If the chromaticity of a predetermined color is present on the blackbody trajectory BC, the color may be represented as a "color temperature" which is a temperature of an ideal radiator. When the metal halide lamp having the light spectrum “B” in FIG. 2 is used as a light source, the light radiated from the metal halide lamp 10 has a color coordinate of X = 0.335 Y = 0.390 under predetermined conditions. Under the same conditions, a conventional hot mirror having the light transmission characteristic "A" of FIG. 2 emits light whose color coordinate is X = 0.337 Y = 0.395. Then, under the same conditions, the color correction hot mirror having the light transmission characteristic "C" of FIG. 2 radiates light whose color coordinate is X = 0.432 Y = 0.337. The above-described color coordinates are shown in English letters corresponding to the light spectra of FIG. 2 around the blackbody trajectory of FIG. As can be seen in FIG. 4, the color coordinate "C" of the color correction hot mirror used in the embodiment of the present invention is located closer to the black body trajectory than the color coordinate "A" of the conventional hot mirror. That is, one embodiment of the present invention for the same metal halide lamp provides a higher color temperature than the conventional case. As a result, since light close to white light can be radiated to the same light source, the single-panel liquid crystal projector using the color correction hot mirror of the present invention improves the image quality of the image displayed on the screen by modulating the light intensity by the liquid crystal panel. .

상술의 일 실시예에서는 메탈할라이드램프를 이용하여 본 발명을 설명하였으나, 광원으로부터 복사되는 광의 색온도를 향상시켜 백색광에 가까운 광을 투과하는 가져오는 다양한 변형실시예가 본 발명의 기술범주내에서 가능하다.In the above-described embodiment, the present invention has been described using a metal halide lamp. However, various modifications to improve the color temperature of light radiated from the light source to transmit light close to white light are possible within the technical scope of the present invention.

상술한 본 발명의 단패널식 액정프로젝터는 액정에 의해 광강도변조할려는 파장대역의 색상광들과 다른 색상광들의 광투과율을 다르게 설정한 색보정필터인 핫미러를 사용하여 광원의 광스펙트럼에 의해 결정되는 투과광의 색을 변화시킨다. 따라서, 색온도를 향상시켜 액정패널에 입사하는 광이 백색광에 가깝게 될뿐만 아니라, 화면에 현시되는 화상의 화질을 향상시키는 효과를 가져온다.The above-described short-panel liquid crystal projector of the present invention uses a hot mirror, which is a color correction filter that sets different light transmittances of color light and other color light in the wavelength band to be modulated by the liquid crystal, to the light spectrum of the light source. The color of the transmitted light determined by this is changed. Therefore, the light incident on the liquid crystal panel by improving the color temperature is not only close to the white light, but also the effect of improving the image quality of the image displayed on the screen.

Claims (4)

파장대역에 따라 광강도를 달리하는 스펙트럼을 갖는 광원과, 광원으로부터 투사되는 광에 영상신호를 인가하기 위한 액정을 갖는 액정프로젝터에 있어서,In the liquid crystal projector having a light source having a spectrum of varying light intensity according to the wavelength band, and a liquid crystal for applying an image signal to the light projected from the light source, 상기 광원과 액정사이에 위치하고, 파장에 따라 투과율을 달리하는 광투과특성을 갖는 색보정필터를 포함하는 단패널식 액정프로젝터.And a color correction filter positioned between the light source and the liquid crystal and having a light transmission characteristic of varying transmittance according to a wavelength. 제1항에 있어서, 상기 색보정필터는 입사광을 백색광에 가까운 색상광으로 투과시키는 광투과특성을 갖는 것을 특징으로 하는 단패널식 액정프로젝터.The liquid crystal projector according to claim 1, wherein the color correction filter has a light transmission characteristic for transmitting incident light to color light close to white light. 제2항에 있어서, 상기 색보정필터는 액정에 의해 광강도 변조할려는 색상광들의 광투과율을 다른 색상광들보다 높게 설정하는 것을 특징으로 하는 단패널식 액정프로젝터.The liquid crystal projector of claim 2, wherein the color correction filter sets a light transmittance of color lights to be modulated by the liquid crystal higher than other color lights. 제3항에 있어서, 상기 색보정필터는 소정 파장대역의 적색·녹색·청색광의 투과율을 다른 색상광보다 높게 하는 것을 특징으로 하는 단패널식 액정프로젝터.4. The short-panel liquid crystal projector according to claim 3, wherein the color correction filter makes transmittance of red, green, and blue light in a predetermined wavelength band higher than other color light.
KR1019930010242A 1993-06-07 1993-06-07 One panel lcd projector KR0139179B1 (en)

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