KR100253071B1 - Active dynamic lcd - Google Patents

Active dynamic lcd Download PDF

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KR100253071B1
KR100253071B1 KR1019970079092A KR19970079092A KR100253071B1 KR 100253071 B1 KR100253071 B1 KR 100253071B1 KR 1019970079092 A KR1019970079092 A KR 1019970079092A KR 19970079092 A KR19970079092 A KR 19970079092A KR 100253071 B1 KR100253071 B1 KR 100253071B1
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South Korea
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light
liquid crystal
irradiated
phosphor
ultraviolet
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KR1019970079092A
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Korean (ko)
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KR19990058907A (en
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박도형
허경재
정좌영
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손욱
삼성에스디아이주식회사
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    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133553Reflecting elements
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133617Illumination with ultraviolet light; Luminescent elements or materials associated to the cell

Abstract

PURPOSE: An LCD device of an active luminescence type is provided to prevent a noxious light in a near ultraviolet area from reaching to a user by forming a near ultraviolet reflecting film. CONSTITUTION: A light in a near ultraviolet area irradiated from a back-light(2) passes through a liquid crystal layer(6) through a polarizer(4). The light is irradiated to a phosphor(12) formed in a front glass board(10) through an analyzer(8) by switching of the liquid crystal layer(6) and radiates. A reflecting film(14) is formed in an external side of the front glass board(10) to block a light in a near ultraviolet area irradiated from the back-light(2).

Description

능동 발광형 액정표시소자Active light emitting liquid crystal display device

본 발명은 능동 발광형 액정표시소자에 관한 것으로서, 특히 인체에 유해한 자외선이 소자의 전면으로 노출되는 것을 차단할 수 있도록 한 자외선 차단막을 갖는 능동 발광형 액정표시소자에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active light emitting liquid crystal display device, and more particularly, to an active light emitting liquid crystal display device having an ultraviolet blocking film for preventing exposure of ultraviolet rays harmful to a human body to the front surface of the device.

능동 발광형 액정표시소자는 백라이트에서 조사되는 빛이 편광자를 거쳐 액정층을 통과되게 하고, 상기 액정층은 배향성을 이용하여 백라이트의 빛을 통과시키거나 통과되지 않게 스위칭하여 주는 작용을 함으로써, 상기 백라이트의 빛이 정해진 표시 형태를 이루게 하는 것이며, 이렇게 액정층을 통과한 백라이트의 빛은 다시 검광자를 거쳐 대응되는 형광체에 조사됨에 따라 화상을 구현하는 구성으로 되어 있다.In the active light emitting display device, the light emitted from the backlight passes through the polarizer and passes through the liquid crystal layer, and the liquid crystal layer functions to switch the light of the backlight to pass through or not to pass through the polarization by using an orientation. The light of the backlight passes through the liquid crystal layer, and the light of the backlight passes through the analyzer again and is irradiated to the corresponding phosphor to form an image.

이와 같은 구조를 가지는 능동 발광형 액정표시소자에서 백라이트는 394nm를 메인 피크로 하고 380∼420nm의 파장 영역을 갖는 근자외선 광이 사용되는 바, 그 광에 의해 형광체가 여기 발광되어야 하므로, 여기에 적용될 수 있는 형광체는 상당한 정도의 고휘도를 갖는 것이어야 한다.In an active light emitting liquid crystal display having such a structure, a backlight is used as near-ultraviolet light having a wavelength range of 380 to 420 nm and having a main peak of 394 nm. Phosphors that can be used should have a high degree of brightness.

지금까지 알려진 능동 발광형 액정표시소자에서 형광체는 380∼420nm의 파장 영역의 광원에 의해 여기 발광되는 적색 형광체, 녹색 형광체 및 청색 형광체가 사용되고 있다.In the active light-emitting liquid crystal display devices known so far, phosphors are used as red phosphors, green phosphors and blue phosphors which are excited by a light source in a wavelength region of 380 to 420 nm.

그런데 이렇게 형성된 능동 발광형 액정표시소자의 전면에서 광 스펙트럼을 측정해 보면, 도 4와 같이 그 전면으로 380∼420nm의 파장에 속하는 근자외선의 일부가 투과되어 나오는 것이 측정되었다.However, when the light spectrum was measured on the front surface of the active light emitting liquid crystal display device thus formed, it was measured that a portion of near ultraviolet rays belonging to a wavelength of 380 to 420 nm was transmitted to the front surface as shown in FIG. 4.

이러한 근자외선은 인체에 해를 끼치는 것으로 알려져 있는 바, 결국 사용자에게 피해를 주게 되는 것이며, 근자외선이 투과되어 밖으로 노출된다는 것은 형광체의 발광에 참여하지 못하는 것이므로, 결과적으로 발광 효율을 저하시키게 되는 것이다.Such near ultraviolet rays are known to cause harm to the human body, which in turn causes damage to the user, and the exposure of the near ultraviolet rays to the outside does not participate in the light emission of the phosphors, resulting in lowering the luminous efficiency. .

따라서, 본 발명은 인체에 유해한 근자외선을 차단하고, 이것을 반사시켜 형광체의 여기 발광에 기여하므로 휘도를 향상시킬 수 있도록 한 능동 발광형 액정표시소자를 제공함에 그 목적이 있는 것이다.Accordingly, an object of the present invention is to provide an active light-emitting liquid crystal display device which can improve luminance by blocking near ultraviolet rays harmful to a human body and reflecting them, thereby contributing to excitation light emission of phosphors.

상기의 목적을 구현하는 수단으로서, 본 발명은 백라이트에서 조사된 빛이 액정층의 스위칭 작용에 의해 소망의 형광체에 조사되어 여기 발광되도록 하는 능동 발광형 액정표시소자에 있어서, 상기 형광체가 형성된 프론트 글라스판의 바깥쪽면에 근자외선 반사막이 형성된 구성으로 이루어진다.As a means for achieving the above object, the present invention is an active light emitting liquid crystal display device in which the light irradiated from the backlight is irradiated to the desired phosphor by the switching action of the liquid crystal layer to emit light, the front glass having the phosphor It consists of a structure in which a near-ultraviolet reflecting film was formed in the outer surface of the board.

근자외선 반사막은 굴절율이 서로 다른 게르마늄과 실리카 옥사이드의 적층 구조로 이루어져, 백라이트에서 조사된 근자외선 영역의 빛을 차단하여 전면으로 노출되는 것을 막고, 그 빛을 형광체로 반사시켜 디스플레이의 휘도를 향상시킨다.The near-ultraviolet reflecting film has a laminated structure of germanium and silica oxide having different refractive indices, and blocks the light in the near-ultraviolet region irradiated from the backlight to prevent it from being exposed to the front, and reflects the light with a phosphor to improve the brightness of the display. .

도 1은 본 발명에 의한 능동 발광형 액정표시소자를 보인 전체 구성도.1 is an overall configuration showing an active light emitting liquid crystal display device according to the present invention.

도 2는 본 발명에 의한 파장별 투과율을 보인 도면.2 is a view showing the transmittance for each wavelength according to the present invention.

도 3은 본 발명에 의한 구동 스펙트럼을 보인 도면.3 is a view showing a driving spectrum according to the present invention.

도 4는 종래 능동 발광형 액정표시소자의 구동 스펙트럼을 보인 도면.4 is a view showing a driving spectrum of a conventional active light emitting liquid crystal display device;

* 도면의 주요 부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

2-백라이트 10-프론트 글라스판2-backlit 10-front glass

12-형광체 14-근자외선 반사막12-phosphor 14-near ultraviolet reflection film

이하, 본 발명을 실현하기 위한 바람직한 실시예를 첨부된 도면에 의거하여 보다 상세하게 설명한다.BEST MODE Hereinafter, preferred embodiments for realizing the present invention will be described in detail with reference to the accompanying drawings.

도 1에서 자세하게 표시된 바와 같이, 본 발명의 능동 발광형 액정표시소자는 백라이트(2)에서 조사된 근자외선 영역의 빛을 편광자(4)를 통해 액정층(6)으로 통과되게 하고, 그 액정층(6)의 스위칭 작용에 의해 검광자(8)를 거쳐 프론트 글라스판(10)에 형성된 소망의 형광체(12)에 조사되어 여기 발광되게 하는 구성으로 되어 있다.As shown in detail in FIG. 1, the active light-emitting liquid crystal display of the present invention allows light in the near-ultraviolet region emitted from the backlight 2 to pass through the polarizer 4 to the liquid crystal layer 6, and the liquid crystal layer thereof. By the switching action of (6), the fluorescent substance 12 is irradiated to the desired fluorescent substance 12 formed in the front glass plate 10 via the analyzer 8, and is made to excite light emission.

여기서, 본 발명은 형광체(12)에 조사되지 않고 프론트 글라스판(10)을 거쳐 그 전면으로 투과되어 나오는 근자외선 영역의 빛을 사용자에게 도달되지 않게 함과 동시에 다시 형광체의 발광에 기여할 수 있도록 하는 기술적 수단을 제공하는 것이다.Here, the present invention prevents the light of the near-ultraviolet region transmitted through the front glass plate 10 to the front surface of the phosphor 12 from being irradiated to the user and at the same time contributes to the emission of the phosphor. To provide technical means.

이를 위하여, 본 발명은 프론트 글라스판(10)의 바깥쪽면에 백라이트(2)에서 조사된 근자외선 영역의 빛을 차단하는 반사막(14)을 형성한다.To this end, the present invention forms a reflective film 14 to block light in the near ultraviolet region irradiated from the backlight 2 on the outer surface of the front glass plate 10.

본 발명의 목적물인 근자외선 반사막(14)은 굴절률이 4.0인 게르라늄과 굴절률이 1.7인 실리카 옥사이드를 다중 박막으로 코팅한 적층 구조로 실현될 수 있다.The near-ultraviolet reflecting film 14, which is the object of the present invention, can be realized in a multilayer structure coated with multiple thin films of germanium having a refractive index of 4.0 and silica oxide having a refractive index of 1.7.

본 출원인은 상기 근자외선 반사막(14)을 이용하여 백라이트(2)에서의 투과율을 측정한 결과, 도 2와 같이 380∼420nm의 근자외선 영역에서 투과율이 10% 정도로 효과적임을 알 수 있었다.Applicant measured the transmittance in the backlight 2 using the near-ultraviolet reflecting film 14, it was found that the transmittance is about 10% effective in the near-ultraviolet region of 380 ~ 420nm as shown in FIG.

또한, 본 출원인은 도 1과 같이 프론트 글라스판(10)의 전면에 자외선 반사막(14)을 형성하고 소자를 구동시켜 광 스펙트럼을 측정한 결과, 도 3과 같이 380∼420nm의 파장에 속하는 근자외선 영역의 피크가 무시될 수 있을 정도로 제거되고, 발광 피크의 강도가 10% 정도 향상됨을 알 수 있었다.In addition, the applicant has formed the ultraviolet reflecting film 14 on the front surface of the front glass plate 10 as shown in FIG. 1 and measured the light spectrum by driving the device, and as shown in FIG. 3, near-ultraviolet rays belonging to a wavelength of 380 to 420 nm. It was found that the peak of the region was removed to a negligible extent, and the intensity of the emission peak was improved by about 10%.

여기서, 발광 효율의 상승은 형광체(12)를 여기 발광시키지 못하고 전면으로 투과되는 빛이 자외선 반사막(14)에 의해 반사되어 다시 형광체(12)의 발광에 기여하는 까닭인 것으로 확인되었다.In this case, it is confirmed that the increase in the luminous efficiency is due to excitation of the phosphor 12 and the light transmitted to the front side is reflected by the ultraviolet reflective film 14 to contribute to the emission of the phosphor 12 again.

따라서 본 발명에 의하면, 백라이트(2)에서 조사된 근자외선 영역이 빛은 편광자(4)를 거쳐 액정층(6)으로 통과되면서 그 액정층(6)의 배향성을 이용하여 스위칭되고, 검광자(8)를 거쳐 소망의 형광체(12)에 1차적으로 조사되는 것이고, 다시 근자외선 반사막(14)에 의해 반사되어 형광체(12)에 2차적으로 조사됨으로써, 근자외선의 외부 노출을 차단함과 동시에 발광 휘도를 향상시키는 것이다.Therefore, according to the present invention, the near-ultraviolet region irradiated from the backlight 2 is switched by using the alignment of the liquid crystal layer 6 while the light passes through the polarizer 4 and into the liquid crystal layer 6. 8) is primarily irradiated to the desired phosphor 12, again reflected by the near-ultraviolet reflecting film 14 and irradiated to the phosphor 12 secondary, thereby blocking the external exposure of the near-ultraviolet It is to improve the luminescence brightness.

이상에서 설명된 구성 및 작용을 통하여 알 수 있듯이, 본 발명에 의한 능동 발광형 액정표시소자는 종래 기술의 문제점을 실질적으로 해소하고 있다.As can be seen through the configuration and operation described above, the active light-emitting liquid crystal display device according to the present invention substantially solves the problems of the prior art.

즉, 본 발명은 굴절율이 서로 다른 게르마늄과 실리카 옥사이드를 적층하여 근자외선 반사막을 형성하므로, 백라이트에서 조사된 유해한 근자외선 영역의 빛이 사용자에게 도달하는 것을 막는 효과를 얻을 수 있다.That is, according to the present invention, since the germanium and the silica oxide having different refractive indices are stacked to form a near-ultraviolet reflecting film, it is possible to obtain an effect of preventing the light in the harmful near-ultraviolet region irradiated from the backlight from reaching the user.

또한, 본 발명에 의하면 형광체를 여기 발광시키지 못하고 소자의 전면으로 투과되는 빛을 다시 반사시키므로, 상기 형광체의 발광 효율을 높이고 궁극적으로 고휘도의 화질을 갖는 디스플레이를 실현하게 되는 것이다.In addition, according to the present invention, since the phosphor does not excite light and reflects light transmitted to the front surface of the device again, the light emitting efficiency of the phosphor is increased and ultimately, a display having high brightness image quality is realized.

한편, 본 발명은 상술한 특정의 바람직한 발명에 한정되지 아니하며, 특허 청구의 범위에서 청구하는 본 발명의 요지를 벗어남이 없이 당해 발명이 속하는 분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변경 실시가 가능할 것이다.On the other hand, the present invention is not limited to the above-described specific preferred invention, any person having ordinary skill in the art to which the invention belongs without departing from the gist of the invention claimed in the claims. It will be possible.

Claims (2)

백라이트에서 조사된 빛이 액정층의 스위칭 작용에 의해 소망의 형광체에 조사되어 여기 발광되도록 하는 능동 발광형 액정표시소자에 있어서, 상기 형광체가 형성된 프론트 글라스판에 근자외선 반사막이 형성되어서, 상기 백라이트에서 조사된 근자외선 영역의 빛이 전면으로 노출되는 것을 차단하고 상기 형광체로 반사되도록 한 구성을 특징으로 하는 능동 발광형 액정표시소자.In an active light emitting liquid crystal display device in which light irradiated from a backlight is irradiated to a desired phosphor by a switching action of a liquid crystal layer to emit excitation light, a near-ultraviolet reflecting film is formed on the front glass plate on which the phosphor is formed, thereby An active light emitting liquid crystal display device, characterized in that the light of the near-ultraviolet region irradiated to the front is blocked and reflected by the phosphor. 제 1 항에 있어서, 근자외선 반사막은 게르마늄과 실리카 옥사이드가 적층된 구성임을 특징으로 하는 능동 발광형 액정표시소자.The active light emitting liquid crystal display device according to claim 1, wherein the near-ultraviolet reflecting film has a structure in which germanium and silica oxide are laminated.
KR1019970079092A 1997-12-30 1997-12-30 Active dynamic lcd KR100253071B1 (en)

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