KR100918873B1 - Direct lighting type backlight unit using led lamps - Google Patents
Direct lighting type backlight unit using led lampsInfo
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- KR100918873B1 KR100918873B1 KR1020080015261A KR20080015261A KR100918873B1 KR 100918873 B1 KR100918873 B1 KR 100918873B1 KR 1020080015261 A KR1020080015261 A KR 1020080015261A KR 20080015261 A KR20080015261 A KR 20080015261A KR 100918873 B1 KR100918873 B1 KR 100918873B1
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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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
-
- 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
-
- 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
-
- 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
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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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
- Led Device Packages (AREA)
Abstract
본 발명은 프리즘 형상의 반사체들을 마름모 형태의 공간이 형성되도록 배치한 후 그 공간에 발광다이오드(LED) 램프를 위치시켜 화면의 균일도를 개선한 직하 조광형 백라이트 장치에 관한 것이다. 본 발명의 백라이트 장치는, 다수의 발광다이오드(LED) 램프가 배열되어 정면으로 빛을 조광하는 직하 조광형 백라이트 장치에 있어서, 상기 발광다이오드(LED) 램프를 실장하기 위한 커버 버텀 프레임과, 상기 커버 버텀 프레임의 평면 공간을 구획하여 마름모 형상의 발광다이오드 램프 실장공간을 형성하도록 배치되는 돌출반사체와, 상기 발광다이오드 램프 실장공간에 실장되는 다수의 발광다이오드 램프들로 이루어진 LED 광원모듈;과 상기 LED 광원모듈을 통해 입사되는 상기 LED 램프의 빛을 확산시켜 균일도를 향상시킨 패턴 확산판을 포함하여 구성된다. 본 발명의 백라이트 장치는 LED의 삼각배열은 LED 사이의 간격을 최소화하여 균일도 향상에 기여하고, LED의 사각(斜角)방향의 광은 돌출반사체에 의해 상부로 반사되어 LED 램프 사이의 암부(暗部) 발생을 줄이고, 반사된 광과 상부로 향하는 광은 확산판의 하면 패턴에 의해 광광(廣光)되어 균일도와 휘도를 증가시키는 효과가 있다.The present invention relates to a direct dimming backlight device in which prism-shaped reflectors are arranged to form a rhombus-shaped space and then a light emitting diode (LED) lamp is placed in the space to improve uniformity of the screen. The backlight device of the present invention is a direct-lighting type backlight device in which a plurality of light emitting diode (LED) lamps are arranged to illuminate light in front, a cover bottom frame for mounting the light emitting diode (LED) lamp, and the cover bottom An LED light source module comprising a projecting reflector arranged to form a light emitting diode lamp mounting space having a rhombus shape by dividing the planar space of the frame, and a plurality of light emitting diode lamps mounted in the light emitting diode lamp mounting space; and the LED light source module It is configured to include a pattern diffusion plate to improve the uniformity by diffusing the light of the LED lamp incident through. In the backlight device of the present invention, the triangular array of LEDs contributes to the improvement of uniformity by minimizing the spacing between the LEDs, and the light in the rectangular direction of the LEDs is reflected upward by the projecting reflector so that the dark portions between the LED lamps ), The reflected light and the light directed upward are lighted by the lower surface pattern of the diffusion plate, thereby increasing uniformity and brightness.
Description
본 발명은 발광다이오드 램프를 이용한 백라이트 장치에 관한 것으로, 더욱 상세하게는 프리즘 형상의 반사체들을 마름모 형태의 공간이 형성되도록 배치한 후 그 공간에 발광다이오드(LED) 램프를 위치시켜 화면의 균일도를 개선한 직하 조광형 백라이트 장치에 관한 것이다.The present invention relates to a backlight device using a light emitting diode lamp. More particularly, the prism-shaped reflectors are arranged to form a rhombus-shaped space, and then a light emitting diode (LED) lamp is placed in the space to improve the uniformity of the screen. One direct illuminant backlight device is disclosed.
일반적으로, 액정표시장치의 백라이트(Back light)는 광원으로 CCFL(Cold Cathode Fluorescent Lamp), HCFL(Hot Cathode Fluorescent Lamp), EEFL(External Electrode Fluorescent Lamp) 등의 형광램프나 LED(Light Emitting Diode)소자, EL(Electro Luminescence)소자 등을 주로 사용하고, 광원이 배치되는 방식에 따라 측면 조광형(Edge-lighting)과 직하 조광형(Direct-lighting) 백라이트로 구분된다. 통상, 측면 조광형 백라이트 장치는 비교적 얇은 두께로 인하여 노트북이나 컴퓨터 모니터용 LCD에 주로 사용되고, 직하 조광형 백라이트 장치는 높은 광효율에 의해 TV 등과 같은 대화면을 목적으로 하는 LCD에 주로 이용된다. In general, a backlight of a liquid crystal display is a light source such as a cold cathode fluorescent lamp (CCFL), a hot cathode fluorescent lamp (HCFL), an external electrode fluorescent lamp (EEFL), or a light emitting diode (LED) device. , EL (Electro Luminescence) devices are mainly used, and are classified into side-lighting and direct-lighting backlights according to the way the light source is arranged. In general, side dimming backlight devices are mainly used in LCDs for notebooks or computer monitors because of their relatively thin thickness, and direct dimming backlight devices are mainly used in LCDs for large screens such as TVs due to high light efficiency.
종래에 발광다이오드(LED) 램프를 이용한 직하 조광형 백라이트(10)는 도 6a에 도시된 바와 같이, 커버 버텀(11)위에 실장되는 LED 램프(12) 어레이, LED 램프 어레이로부터의 빛을 확산시켜 균일도를 향상시키는 확산판(13)으로 구성된다. In the conventional direct-illuminated backlight 10 using a light emitting diode (LED) lamp, as shown in FIG. 6A, the LED lamp 12 is mounted on the cover bottom 11, and uniformity by diffusing light from the LED lamp array. It consists of a diffusion plate 13 to improve the.
그런데 LED 램프(12)는 전방향(全方向)으로 광을 방사하는 형광램프와는 달리 소정의 각도에서만 광을 방사하는 특징이 있어 각도에 따라 정면 조광율이 달라 휘도의 차이로 인해 균일도가 떨어지게 된다. 예컨대, 종래의 발광다이오드(LED) 램프(12)를 이용한 직하 조광형 백라이트(10)에서 일반 확산판(13)을 사용할 경우 도 6b에 도시된 바와 같이, 수직방향의 광에 대해서는 대략 73%의 정면조광이 이루어지고, 15°방향에서는 대략 91%의 정면조광이 이루어지며, 30°방향에서는 대략 73%의 정면 조광이 이루어져 도 6c에 도시된 바와 같이 휘도의 최고치와 최저치 사이의 편차가 크게 나타난다.However, unlike the fluorescent lamp which emits light in all directions, the LED lamp 12 emits light only at a predetermined angle, so that the front dimming rate varies depending on the angle, so that the uniformity is decreased due to the difference in luminance. do. For example, when the general diffuser plate 13 is used in the direct dimming backlight 10 using the conventional LED lamp 12, as shown in FIG. 6B, approximately 73% of the front face is perpendicular to the vertical light. Dimming is performed, approximately 91% front dimming is performed in the 15 ° direction, and approximately 73% front dimming is performed in the 30 ° direction, so that the deviation between the highest value and the lowest value of luminance is large as shown in FIG. 6C.
발광다이오드(LED) 램프를 이용한 종래의 직하 조광형 백라이트 장치는 확산판으로 입사되는 입사광의 각도에 따라 정면 조광율이 달라져 휘도의 차이로 인해 균일도가 떨어지는 문제점이 있다.The conventional direct dimming type backlight device using a light emitting diode (LED) lamp has a problem in that the front dimming ratio is changed according to the angle of incident light incident on the diffuser plate, resulting in inferior uniformity due to the difference in luminance.
본 발명은 상기와 같은 문제점을 해결하기 위하여 제안된 것으로, 본 발명의 목적은 프리즘 형상의 반사체들을 마름모 형태의 공간이 형성되도록 배치한 후 그 공간에 발광다이오드(LED) 램프를 위치시켜 화면의 균일도를 개선한 직하 조광형 백라이트 장치를 제공하는 것이다The present invention has been proposed to solve the above problems, and an object of the present invention is to arrange the prism-shaped reflectors to form a rhombus-shaped space and then place a light emitting diode (LED) lamp in the space to achieve uniformity of the screen. It is to provide a direct dimming backlight device that is improved
본 발명의 다른 목적은 확산판의 하면에 꼭지면이 둥근 프리즘 패턴을 형성하여 균일도와 휘도를 개선한 발광다이오드 램프를 이용한 직하 조광형 백라이트 장치를 제공하는 것이다.Another object of the present invention is to provide a direct dimming backlight device using a light emitting diode lamp having a rounded prism pattern on the bottom surface of a diffuser plate to improve uniformity and brightness.
상기와 같은 목적을 달성하기 위하여 본 발명의 백라이트 장치는, 다수의 발광다이오드(LED) 램프가 배열되어 정면으로 빛을 조광하는 직하 조광형 백라이트 장치에 있어서, 상기 발광다이오드(LED) 램프를 실장하기 위한 커버 버텀 프레임과, 상기 커버 버텀 프레임의 평면 공간을 구획하여 마름모 형상의 발광다이오드 램프 실장공간을 형성하도록 배치되는 돌출반사체와, 상기 발광다이오드 램프 실장공간에 실장되는 다수의 발광다이오드 램프들로 이루어진 LED 광원모듈;과 상기 LED 광원모듈을 통해 입사되는 상기 LED 램프의 빛을 확산시켜 균일도를 향상시킨 패턴 확산판을 포함하여 구성된 것을 특징으로 한다.In order to achieve the above object, the backlight device of the present invention is a direct-lighting type backlight device in which a plurality of light emitting diode (LED) lamps are arranged to illuminate the front, for mounting the light emitting diode (LED) lamp. An LED comprising a cover bottom frame, a projecting reflector arranged to divide a plane space of the cover bottom frame to form a light emitting diode lamp mounting space having a rhombus shape, and a plurality of light emitting diode lamps mounted in the light emitting diode lamp mounting space. And a pattern diffuser plate which improves uniformity by diffusing light of the LED lamp incident through the LED light source module.
상기 돌출반사체는 삼각 프리즘 형상으로서 밑변의 각도(θa)가 45° 내지 64° 사이의 값을 갖고, 해당 LED 램프로부터 입사되는 광에 대해 95% 이상의 반사 특성을 갖는 것이고, 상기 확산판의 하면에는 꼭지면이 둥근 프리즘 패턴이 형성되어 있고, 상기 프리즘 패턴은 꼭지면이 곡률반경(R)이 50㎛ 내지 100㎛ 사이의 값을 갖는 곡면으로 되어 있으며, 빗면을 연장해 형성되는 꼭지각(θb)은 60°내지 100°사이의 값을 갖는 것이다.The protruding reflector has a triangular prism shape and has a base angle (θ a ) of between 45 ° and 64 ° and a reflection characteristic of 95% or more with respect to light incident from the LED lamp. In the prism pattern is formed a round prism pattern, the prism pattern is a curved surface having a radius of curvature (R) between 50㎛ 100㎛, the vertex angle (θ b ) formed by extending the oblique surface Is a value between 60 ° and 100 °.
본 발명에 따른 백라이트를 이용한 직하 조광형 백라이트 장치는 LED의 삼각배열은 LED 사이의 간격을 최소화하여 균일도 향상에 기여하고, LED의 사각(斜角)방향의 광은 돌출반사체에 의해 상부로 반사되어 LED 램프 사이의 암부(暗部) 발생을 줄이고, 반사된 광과 상부로 향하는 광은 확산판의 하면 패턴에 의해 광광(廣光)되어 균일도와 휘도를 증가시키는 효과가 있다.In the direct illuminating backlight device using the backlight according to the present invention, the triangular arrangement of the LED minimizes the gap between the LEDs and contributes to improving the uniformity, and the light in the rectangular direction of the LED is reflected upwards by the projecting reflector and the LED. The occurrence of dark parts between the lamps is reduced, and the reflected light and the light directed upward are lighted by the lower surface pattern of the diffusion plate, thereby increasing uniformity and brightness.
도 1은 본 발명에 따른 발광다이오드 램프를 이용한 직하 조광형 백라이트 장치를 도시한 사시도,1 is a perspective view showing a direct dimming backlight device using a light emitting diode lamp according to the present invention;
도 2는 본 발명에 따른 LED 램프의 평면 배열 구조를 도시한 도면,2 is a view showing a planar arrangement of the LED lamp according to the invention,
도 3a는 본 발명에 따른 돌출반사체의 형상을 도시한 도면,Figure 3a is a view showing the shape of the projecting reflector according to the present invention,
도 3b는 본 발명에 따른 돌출반사체의 측단면도,Figure 3b is a side cross-sectional view of the projecting reflector according to the present invention,
도 4는 본 발명에 따른 확산판의 하면 패턴을 확대 도시한 도면, 4 is an enlarged view of a bottom pattern of a diffusion plate according to the present invention;
도 5a 및 도 5b는 본 발명에 따른 발광다이오드 램프를 이용한 직하 조광형 백라이트 장치의 광학 특성을 설명하기 위해 도시한 도면,5A and 5B are diagrams for explaining optical characteristics of a direct dimming backlight device using a light emitting diode lamp according to the present invention;
도 6a 내지 도 6c는 종래의 발광다이오드 램프를 이용한 직하 조광형 백라이트 장치의 광학 특성을 설명하기 위해 도시한 도면이다.6A to 6C are diagrams for explaining optical characteristics of a direct dimming backlight device using a conventional light emitting diode lamp.
** 도면의 주요 부분에 대한 부호의 설명 **** Description of symbols for the main parts of the drawing **
100: 직하 조광형 백라이트 장치 110: LED 광원모듈100: direct illuminating backlight 110: LED light source module
112: 커버 버텀 프레임 114: LED 램프112: cover bottom frame 114: LED lamp
116: 돌출반사체 120: 패턴 확산판116: projecting reflector 120: pattern diffuser plate
본 발명과 본 발명의 실시에 의해 달성되는 기술적 과제는 다음에서 설명하는 본 발명의 바람직한 실시예들에 의하여 보다 명확해질 것이다. 다음의 실시예들은 단지 본 발명을 설명하기 위하여 예시된 것에 불과하며, 본 발명의 범위를 제한하기 위한 것은 아니다. The technical problems achieved by the present invention and the practice of the present invention will be more clearly understood by the preferred embodiments of the present invention described below. The following examples are merely illustrated to illustrate the present invention and are not intended to limit the scope of the present invention.
도 1은 본 발명에 따른 발광다이오드(LED) 램프를 이용한 직하 조광형 백라이트 장치를 도시한 사시도이고, 도 2는 본 발명에 따른 LED 램프의 평면 배열 구조를 도시한 도면이다. 도 3a는 본 발명에 따른 돌출반사체의 형상을 도시한 도면이고, 도 3b는 본 발명에 따른 돌출반사체의 측단면도이며, 도 4는 도 1에 도시된 확산판의 하면 패턴을 확대 도시한 도면이다.1 is a perspective view showing a direct dimming backlight device using a light emitting diode (LED) lamp according to the present invention, Figure 2 is a view showing a planar arrangement of the LED lamp according to the present invention. Figure 3a is a view showing the shape of the projecting reflector according to the present invention, Figure 3b is a side cross-sectional view of the projecting reflector according to the invention, Figure 4 is an enlarged view showing the bottom pattern of the diffuser plate shown in FIG. .
도 1을 참조하면, 본 발명에 따른 발광다이오드(LED) 램프를 이용한 직하 조광형 백라이트 장치(100)는 CCFL 대신에 광원기능을 하는 LED 램프(114)를 실장하기 위한 LED 광원모듈(110)과, LED 램프의 빛을 확산시켜 균일하게 하는 패턴 확산판(120)으로 구성된다.Referring to FIG. 1, a direct dimming backlight device 100 using a light emitting diode (LED) lamp according to the present invention includes an LED light source module 110 for mounting an LED lamp 114 functioning as a light source instead of a CCFL; It consists of a pattern diffuser plate 120 to diffuse the light of the LED lamp to uniform.
LED 광원모듈(110)은 발광다이오드(LED) 램프들을 실장하기 위한 커버 버텀 프레임(112)과, 커버 버텀 프레임(112)의 평면 공간을 구획하여 마름모꼴의 발광다이오드 램프 실장공간을 형성하도록 배치되는 돌출반사체(116)와, 발광다이오드 램프 실장공간에 각각 실장되는 다수의 발광다이오드 램프들(114)로 구성된다. The LED light source module 110 is disposed to form a rhombus light emitting diode lamp mounting space by dividing a cover bottom frame 112 for mounting light emitting diode (LED) lamps and a planar space of the cover bottom frame 112. A reflector 116 and a plurality of light emitting diode lamps 114 mounted in the light emitting diode lamp mounting space, respectively.
LED광원모듈의 LED 실장공간에 배치되는 LED 램프들(114)은 도 2에 도시된 바와 같이, 삼각배열을 이루어 LED 램프(114) 사이의 간격을 최소화하여 균일도 향상에 기여하는데, 동일 수평선상에서 이웃하는 LED 램프(114)와의 거리를 A 라 하고, 서로 이웃하는 수평선들 사이의 거리를 B라 하며, 이웃하는 수평선상의 가장 가까운 LED 램프와의 거리를 C라 할 경우에 다음 수학식1과 같은 관계가 있다.As shown in FIG. 2, the LED lamps 114 disposed in the LED mounting space of the LED light source module form a triangular array, thereby minimizing the gap between the LED lamps 114, thereby improving uniformity. A distance from the LED lamp 114 is referred to as A, a distance between neighboring horizons is called B, and a distance from the nearest LED lamp on the neighboring horizon is called C. There is.
또한 LED 실장공간을 형성하는 돌출반사체(116)는 도 3a 및 도 3b에 도시된 바와 같이, 측단면이 삼각형인 프리즘 형상으로 돌출되어 있고 좌우 사선방향으로 교차 배치되어 마름모꼴의 LED 실장공간을 형성한다. 그리고 마름모꼴의 LED 실장공간에는 도 3a에 도시된 바와 같이 각각의 실장공간마다 LED 램프(114)가 하나씩 실장되어 있고, 각 LED 램프(114)는 도 2에 도시된 바와 같이 R,G,G,B LED 칩들로 이루어져 백색광을 발광하도록 되어 있다.In addition, as shown in FIGS. 3A and 3B, the protruding reflector 116 forming the LED mounting space protrudes in a prism shape having a lateral cross section and is disposed to cross in a left and right diagonal direction to form a diamond-shaped LED mounting space. . In addition, as shown in FIG. 3A, one LED lamp 114 is mounted in each of the mounting spaces in the rhombic LED mounting space, and each LED lamp 114 is R, G, G, and the like as shown in FIG. 2. It consists of B LED chips to emit white light.
도 3b에서 돌출반사체(116)의 밑변의 각도(θa)는 45° 내지 64° 사이의 값을 갖고, 해당 LED 램프(114)로부터 입사되는 광에 대해 95% 이상의 반사 특성을 제공한다.In FIG. 3B, the angle θ a of the bottom side of the protruding reflector 116 has a value between 45 ° and 64 °, and provides 95% or more of reflection characteristics for light incident from the corresponding LED lamp 114.
패턴 확산판(120)은 도 1 및 도 4에 도시된 바와 같이, 하면에 연속된 양각 프리즘 패턴(P1)이 형성되어 있는데, 통상의 프리즘 패턴과 달리 본 발명에 따라 패턴 확산판(120)의 하면에 형성된 프리즘 패턴(P1)은 꼭지면이 곡률반경(R)이 50㎛ 내지 100㎛ 사이의 값을 갖는 곡면으로 되어 있다. 그리고 빗면을 그대로 연장할 경우에 형성되는 꼭지각(θb)은 60°내지 100°사이의 값을 가진다.As shown in FIGS. 1 and 4, the pattern diffuser plate 120 has an embossed prism pattern P1 formed on a lower surface thereof. Unlike the conventional prism pattern, the pattern diffuser plate 120 may be formed according to the present invention. The prism pattern P1 formed on the lower surface has a curved surface whose curvature radius R has a value between 50 micrometers and 100 micrometers. And the vertex angle (θ b ) formed when extending the inclined surface as it has a value of 60 ° to 100 °.
이와 같이 구성되는 본 발명에 따른 발광다이오드(LED) 램프를 이용한 직하 조광형 백라이트 장치(100)의 광학특성을 자세히 살펴보면 다음과 같다.Looking at the optical characteristics of the direct-dimming backlight device 100 using a light emitting diode (LED) lamp according to the present invention configured as described above in detail as follows.
도 5a 및 도 5b는 본 발명에 따른 발광다이오드 램프를 이용한 직하 조광형 백라이트 장치의 광학 특성을 설명하기 위해 도시한 도면이다.5A and 5B are diagrams for explaining optical characteristics of a direct dimming backlight device using a light emitting diode lamp according to the present invention.
도 5a를 참조하면, 본 발명에 따른 발광다이오드(LED) 램프를 이용한 직하 조광형 백라이트(100)에서 하면에 프리즘 패턴(P1)이 형성된 패턴 확산판(120)으로 입사되는 광에서 수직방향의 광에 대해서는 대략 100%의 정면조광이 이루어지고, 15°방향의 광에 대해서는 대략 100%의 정면조광이 이루어지며, 30°방향의 광에 대해서도 대략 100%의 정면 조광이 이루어지는 것을 알 수 있다.Referring to FIG. 5A, the light incident to the pattern diffuser 120 having the prism pattern P1 formed on the lower surface of the direct dimming backlight 100 using the light emitting diode (LED) lamp according to the present invention is applied to the light in the vertical direction. It can be seen that approximately 100% front dimming is performed, approximately 100% front dimming is performed for the light in the 15 ° direction, and approximately 100% front dimming is made for the light in the 30 ° direction.
그리고 이와 같이 넓은 각도 범위에서 대략 100%의 정면 조광이 이루어지므로 도 5b에 도시된 바와 같이 휘도의 최고치와 최저치 사이의 편차가 작아 전체적으로 휘도가 균일하게 되는 것을 알 수 있다.Since the front dimming of approximately 100% is achieved in such a wide angle range, as shown in FIG. 5B, the deviation between the highest value and the lowest value of the luminance is small and the luminance is uniform.
더욱이 본 발명에 따른 광학특성(도 5a 및 도 5b)과 종래의 광학특성(도 6b 및 도 6c)을 대비해 보면, 본 발명에 따른 백라이트 장치(100)가 종래의 백라이트 장치(10)에 비해 광효율이 높고, 휘도의 편차가 작아져 균일도가 향상되는 것을 확인할 수 있다.Furthermore, when comparing the optical characteristics (FIGS. 5A and 5B) and the conventional optical characteristics (FIGS. 6B and 6C) according to the present invention, the backlight device 100 according to the present invention has a light efficiency compared to the conventional backlight device 10. It is confirmed that this is high and the variation in luminance is small, so that the uniformity is improved.
이상에서 본 발명은 도면에 도시된 일 실시 예를 참고로 설명되었으나, 본 기술분야의 통상의 지식을 가진 자라면 이로부터 다양한 변형 및 균등한 타 실시 예가 가능하다는 점을 이해할 것이다. Although the present invention has been described with reference to one embodiment shown in the drawings, it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible therefrom.
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| PCT/KR2008/004781 WO2009104846A1 (en) | 2008-02-20 | 2008-08-18 | Direct lighting type backlight unit using led lamps |
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| CN105137652A (en) * | 2015-07-20 | 2015-12-09 | 京东方科技集团股份有限公司 | Diffuser plate, backlight module, and display device |
| CN115167035B (en) * | 2022-09-08 | 2022-12-23 | 惠科股份有限公司 | Backlight module and display device |
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