CN100521861C - light emitting device - Google Patents

Abstract

A light-emitting device comprises a light source concentration block and a lamp tube. The light source concentration block comprises a concentration block body and a reflecting material. The concentrating block body is provided with an arc-shaped groove, and the reflecting material is formed on the groove wall of the arc-shaped groove. The lamp tube is arranged on the light source concentration block in a way of being embedded with the arc-shaped groove, and the tube body of part of the lamp tube is coated by the reflecting material.

Description

light emitting device

technical field

The present invention relates to a lighting device, and in particular to a lighting device which uses a light source concentration block to control the light divergence angle of a lamp tube.

Background technique

With the rapid progress of liquid crystal display (liquid crystal display, LCD) production technology, and its advantages of thinness, lightness, power saving and radiation-free, liquid crystal displays are widely used in personal digital assistants (personal digital assistants, PDAs) ), notebook computers, digital cameras, digital camcorders, mobile phones, computer screens and LCD TVs and other electronic products. However, since the liquid crystal display panel in the liquid crystal display is a non-self-illuminating display panel, it needs the light provided by the backlight assembly to produce the display function. Wherein, the light of the backlight assembly comes from a light source provided inside it, such as a fluorescent tube or a light emitting diode.

Please refer to FIG. 1 , which is a cross-sectional view of a traditional fluorescent tube. In Fig. 1, the fluorescent tube 100 includes a glass tube 102, a fluorescent layer 104 and a reflective layer 106, the fluorescent layer 104 is coated on the inner wall of the tube body of the glass tube 102, and the reflective layer 106 is coated on the glass tube 102 on the outer wall of the tube body. Wherein, the reflective layer 106 has a light emitting port 108 for determining the light divergence angle θ2 of the fluorescent tube 100 .

When a high voltage is applied to the electrode portions (not shown in FIG. 1 ) at both ends of the fluorescent lamp tube 100, electrons are emitted from the electrode portion to the center of the tube body of the fluorescent lamp tube 100, and the electrons will be connected to the glass tube 102. Mercury (Hg) strikes. After the mercury is hit by electrons accelerated by high voltage, the mercury will rapidly return from an unstable state to a stable state, and release excess energy with ultraviolet rays with a wavelength of 253.7 nanometers (nm). The ultraviolet light will be absorbed by the fluorescent layer 104 and converted into visible light. After being reflected by the reflective layer 102 , the light is emitted out of the fluorescent tube 100 through the light emitting port 108 .

In the process of forming the reflective layer 106 on the outer wall of the tube body of the glass tube 102, a layer of reflective material is usually first coated on the outer wall of the tube body of the glass tube 102, and then the part corresponding to the light emitting port 108 is scraped off. reflective material to form the reflective layer 106. However, it is difficult to control the size of the light emitting port 108 with such a design, thus causing the light divergence angle Θ2 to be not as expected. In addition, during the process of scraping off part of the reflective material, the fluorescent tube 100 is easily scratched, which shortens the life of the fluorescent tube 100 . In addition, since the reflective layer 106 has limited adhesion to the outer wall of the glass tube 102 , the reflective layer 106 is easily peeled off when subjected to external force, and the light divergence angle of the fluorescent tube 100 cannot be kept constant.

Contents of the invention

In view of this, the purpose of the present invention is to provide a light emitting device, which is designed with a light source concentration block with a reflective layer to carry the lamp tube, which can prevent the reflective layer from falling off due to external force, and accurately control the light divergence angle of the lamp tube.

According to the present invention, a light emitting device is provided, which includes a light source concentrating block and a lamp tube. The light source concentrating block includes a concentrating block body and a reflective material. The concentrating block body has an arc-shaped groove, and the reflective material is formed on the groove wall of the arc-shaped groove. The lamp tube is arranged on the light source concentrating block in a manner of fitting with the arc-shaped groove, and part of the tube body of the lamp tube is covered by a reflective material.

According to the present invention, a backlight assembly is provided, which includes a frame and a light emitting device. An accommodating groove is formed on the top surface of the frame. The light emitting device is arranged in the accommodating groove, and the light emitting device includes a light source concentrating block and a lamp tube. The light source concentrating block includes a concentrating block body and a reflective material, and the reflective material is formed on the groove wall of the arc-shaped groove of the concentrating block body. The lamp tube is arranged on the light source concentrating block in a manner of fitting with the arc-shaped groove, and part of the tube body of the lamp tube is covered by a reflective material.

According to the present invention, a backlight assembly is provided, which includes a frame, a reflector, a light guide plate, a reflector and a light emitting device. The reflection plate is arranged on the bottom plate of the frame, and the light guide plate is arranged on the reflection plate. The reflection cover is arranged between the frame side plate and the side surface of the light guide plate, and the reflection cover has a reflection cover bottom plate, a reflection cover side plate and a reflection cover top plate. The bottom plate of the reflector, the side plates of the reflector and the top plate of the reflector jointly form a groove of the reflector. touch. The light emitting device is arranged in the groove of the reflection cover, and the light emitting device includes a light source concentration block and a lamp tube. The light source concentrating block includes a concentrating block body and a reflective material. The concentrating block body has an arc-shaped groove, the opening of the arc-shaped groove faces the side of the light guide plate, and the reflective material is formed on the groove wall of the arc-shaped groove. The lamp tube is arranged on the light source concentrating block in a manner of fitting with the arc-shaped groove, and part of the tube body of the lamp tube is covered by a reflective material.

In order to further illustrate the above-mentioned purpose, structural features and effects of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings.

Description of drawings

FIG. 1 is a sectional view of a conventional fluorescent lamp tube.

FIG. 2 is a cross-sectional view of a backlight assembly according to Embodiment 1 of the present invention.

FIG. 3 is an exploded perspective view of the light emitting device of FIG. 2 .

Fig. 4 is a cross-sectional view of a light source concentrating block according to Embodiment 2 of the present invention.

FIG. 5 is a cross-sectional view of a backlight assembly according to Embodiment 3 of the present invention.

Detailed ways

Embodiment one

Please refer to FIG. 2 , which is a cross-sectional view of a backlight assembly according to Embodiment 1 of the present invention. In FIG. 2 , the backlight assembly 200 at least includes a frame 202 , several light emitting devices 300 and a multilayer optical film 206 . An accommodating groove 204 is formed on the top surface of the frame 202 , and each light emitting device 300 is disposed in the accommodating groove 204 by being adjacent to each other and arranged in parallel. The multilayer optical film 206 is disposed on the top surface of the frame 202 in a manner of sealing the opening of the accommodating groove 204 , and is located above the light emitting device 300 . It should be noted that the multilayer optical film 206 is, for example, a combination of a diffusing plate, a prism sheet, and a brightness enhanced film (BEF).

Please refer to FIG. 3 , which is an exploded perspective view of the light emitting device according to FIG. 2 . Please refer to FIG. 2 at the same time. In FIG. 3 , the lighting device 300 includes a light source concentrating block 302 and a lamp tube 310. The light source concentrating block 302 includes a concentrating block body 304 and a reflective material 308. The top surface of the concentrating block body 304 has An arc groove 306 . The reflective material 308 is formed on the groove wall of the arc-shaped groove 306. The reflective material 306 is, for example, a metal reflective film formed by coating method, and the material of the reflective material 308 is metal or metal alloy such as silver, aluminum, and copper. The lamp tube 310 is arranged on the light source concentrating block 302 in a manner of fitting with the arc-shaped groove 306 , and part of the tube body of the lamp tube 310 is covered by the reflective material 308 . Wherein, the lamp 310 is, for example, a cold cathode fluorescent lamp (CCFL). Generally speaking, the curvature of the groove wall of the arc-shaped groove 306 corresponds to the curvature of the tube body of the lamp tube 310, so that the light source concentration block 302 can support the lamp tube 310, and the reflective material 308 can cover part of the lamp tube 310. Tube body.

Because the tube body of part of the lamp tube 310 is covered by the reflective material 308, the tube body of the other part of the lamp tube that is not covered by the reflective material 308 forms a light exit 312, and the light exit 312 is facing to FIG. 2 multilayer optical film 206 . With the reflection of the reflective material 308 , the light of the lamp tube 310 is emitted from the light emitting port 312 out of the lamp tube 310 , and directed toward the multilayer optical film 206 in FIG. 2 .

When the curvature of the groove wall of the arc-shaped groove 306 remains unchanged, the size D of the light emitting port 312 is determined by the height H of the concentrating block body 304 . When the height H of the concentrating block body 304 is higher, the size D of the light emitting port 312 will be smaller, and the light divergence angle Z of the light tube 310 will also be reduced accordingly. Therefore, through the control of the height H of the central block body 304 , the corresponding size D of the light emitting port 312 can be obtained.

Embodiment two

Please refer to FIG. 4 , which is a cross-sectional view of the light source concentration block according to the present invention. In FIG. 4 , the light source concentrating block 302 a includes a first concentrating block body 3041 , a second concentrating block body 3042 , a first reflective material 3081 and a second reflective material 3082 . The first concentration block body 3041 has a first joint surface 3043 and a first concave surface 3045 connected thereto, and the second concentration block body 3042 has a second joint surface 3044 and a second concave surface 3046 connected thereto. The first reflective material 3081 and the second reflective material 3082 are respectively formed on the first concave surface 3045 and the second concave surface 3046 . When the first joint surface 3043 is connected with the second joint surface 3044, the first concentrating block body 3041 and the second concentrating block body 3042 constitute the concentrating block body 304 of FIG. The groove wall of the arc-shaped groove 306, and the first reflective material 3081 and the second reflective material 3082 are composed of the reflective material 308 in FIG. 3 . It can be seen from this that the light source concentrating block of the present invention may be composed of a plurality of separated concentrating block bodies and a plurality of separated reflective materials.

Embodiment three

Please refer to FIG. 5 , which is a cross-sectional view of a backlight assembly according to Embodiment 3 of the present invention. In FIG. 5 , the backlight assembly 500 includes a frame 502 , a reflector 504 , a light guide plate 506 , a reflector 508 and a light emitting device 600 .

The frame 502 has a frame bottom plate 5021 and a frame side plate 5022 , the reflection plate 504 is disposed on the frame bottom plate 5021 , and the light guide plate 506 is disposed on the reflection plate 504 . The reflector 508 is arranged between the frame side plate 5022 and the side of the light guide plate 506, and the reflector 508 has a reflector bottom plate 5081, a reflector side plate 5082 and a reflector top plate 5083, wherein the reflector side plate 5082 is Connect the bottom plate 5081 of the reflector and the top plate 5083 of the reflector.

Reflector bottom plate 5081, reflector side plate 5082 and reflector top plate 5083 form a reflector groove 5084, the opening of reflector groove 5084 faces the side of light guide plate 506, and one side of the bottom surface of reflector top plate 5083 is connected to light guide plate One side of the top surface of 506 is in contact.

The light emitting device 600 includes a light source concentrating block 602 and a lamp tube 610 , and the light emitting device 600 is disposed in the groove 5084 of the reflector. The light source concentrating block 602 includes a concentrating block body 604 and a reflective material 608 . The top surface of the concentrating block body 604 has an arc-shaped groove 606 . The opening of the arc-shaped groove 606 faces the side of the light guide plate 506 . The reflective material 608 is formed on the groove wall of the arc-shaped groove 606 .

The lamp tube 610 is set on the light source concentrating block 602 in a manner of fitting with the arc-shaped groove 606, and part of the tube body of the lamp tube 610 is covered by the reflective material 608, and the light of the lamp tube 610 is passed through the light guide plate The sides of the light guide plate 506 enter into the light guide plate 506 . It should be noted that the structure of the light source concentrating block 602 may also be the same as that of the light source concentrating block 302a in the second embodiment.

The light-emitting device disclosed in the above-mentioned embodiments of the present invention is designed to carry the light tube with a light source concentration block with a reflective layer, which can prevent the reflective layer from falling off due to external force, accurately control the light divergence angle of the light tube, and improve the backlight assembly. The brightness quality is many.

Although the present invention has been described with reference to the current specific embodiments, those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention, and other modifications can be made without departing from the spirit of the present invention. Various equivalent changes and modifications, therefore, as long as the changes and modifications to the above embodiments are within the spirit of the present invention, they will all fall within the scope of the claims of the present invention.

Claims (16)

1. A lighting device, comprising: A light source concentrating block, comprising: a concentrating block body having an arcuate groove; and A reflective material is formed on the groove wall of the arc-shaped groove; and A light tube is arranged on the light source concentrating block in a manner of fitting with the arc-shaped groove, and part of the tube body of the light tube is covered by the reflective material and is in contact with the reflective material. 2. The lighting device according to claim 1, characterized in that the centralized block body comprises: A first concentrating block body having a first joint surface and a first concave surface connected thereto; and A second concentrating block body has a second joint surface and a second concave surface connected to each other, and the second joint surface is used to connect with the first joint surface, so that the second concave surface and the first concave surface form the arc The groove wall of the groove. 3. The light emitting device according to claim 2, wherein the reflective material comprises: a first reflective material is formed on the first concave surface; and A second reflective material is formed on the second concave surface. 4. The lighting device according to claim 1, wherein the material of the collecting block body is acrylic. 5. The light emitting device as claimed in claim 1, wherein the reflective material is metal. 6. A backlight assembly, comprising: a frame, the top surface of which is to form a receiving groove; and A light emitting device is arranged in the accommodating tank, and the light emitting device includes: A light source concentrating block, comprising: a concentrating block body having an arcuate groove; and A reflective material is formed on the groove wall of the arc-shaped groove; and A light tube is arranged on the light source concentrating block in a manner of fitting with the arc-shaped groove, and part of the tube body of the light tube is covered by the reflective material and is in contact with the reflective material. 7. The backlight assembly as claimed in claim 6, wherein the concentrating block body comprises: A first concentrating block body having a first joint surface and a first concave surface connected thereto; and A second concentrating block body has a second joint surface and a second concave surface connected to each other, and the second joint surface is used to connect with the first joint surface, so that the second concave surface and the first concave surface form the arc The groove wall of the groove. 8. The backlight assembly as claimed in claim 7, wherein the reflective material comprises: a first reflective material is formed on the first concave surface; and A second reflective material is formed on the second concave surface. 9. The backlight assembly as claimed in claim 6, wherein the material of the light source concentrating block is acrylic. 10. The backlight assembly as claimed in claim 6, wherein the reflective material is metal. 11. The backlight assembly according to claim 6, wherein the backlight assembly further comprises a multilayer optical film, and the multilayer optical film is arranged on the top surface of the frame to seal the opening of the receiving groove on and above the light emitting device. 12. A backlight assembly, comprising: A frame has a frame bottom plate and a frame side plate; a reflection plate is arranged on the bottom plate of the frame; A light guide plate is arranged on the reflection plate; A reflector is arranged between the frame side plate and the side of the light guide plate, the reflector has a reflector bottom plate, a reflector side plate and a reflector top plate, the reflector side plate is connected to the reflector The bottom plate and the reflector top plate, the reflector bottom plate, the reflector side plate and the reflector top plate form a reflector groove, the opening of the reflector groove faces the light guide plate, and the bottom surface of the reflector top plate one side is in contact with the side of the top surface of the light guide plate; and A light emitting device is arranged in the groove of the reflector, and the light emitting device includes: A light source concentrating block, comprising: A concentrating block body has an arc-shaped groove, and the opening of the arc-shaped groove is facing the side of the light guide plate; and A reflective material is formed on the groove wall of the arc-shaped groove; and A lamp tube is arranged on the light source concentrating block in a manner of fitting with the arc-shaped groove, and part of the tube body of the lamp tube is covered by the reflective material and is in contact with the reflective material. The light enters the light guide plate through the side of the light guide plate. 13. The backlight assembly according to claim 12, wherein the concentrating block body comprises: A first concentrating block body having a first joint surface and a first concave surface connected thereto; and A second concentrating block body has a second joint surface and a second concave surface connected to each other, and the second joint surface is used to connect with the first joint surface, so that the second concave surface and the first concave surface form the arc The groove wall of the groove. 14. The backlight assembly as claimed in claim 13, wherein the reflective material comprises: a first reflective material is formed on the first concave surface; and A second reflective material is formed on the second concave surface. 15. The backlight assembly as claimed in claim 12, wherein the light source concentrating block is made of acrylic. 16. The backlight assembly as claimed in claim 12, wherein the reflective material is metal.

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