CN102494284A

CN102494284A - Lateral illumination type backlight module capable of improving LED (light emitting diode) luminous efficiency

Info

Publication number: CN102494284A
Application number: CN2011104314061A
Authority: CN
Inventors: 赵圣杰; 王世林
Original assignee: Nanjing CEC Panda LCD Technology Co Ltd
Current assignee: Nanjing CEC Panda LCD Technology Co Ltd
Priority date: 2011-12-21
Filing date: 2011-12-21
Publication date: 2012-06-13

Abstract

The invention discloses a lateral illumination type backlight module capable of improving the LED (light emitting diode) luminous efficiency. The backlight module comprises a light guide panel and at least one LED, wherein the light guide panel is provided with at least one incident surface and at least one emergent surface; the LED and the incident surface of the light guide panel are oppositely arranged; the LED is provided with an emergent surface facing to the incident surface of the light guide panel; the LED is positioned on at least one corner of the light guide panel; and the emergent surface of the LED is of a convex structure. According to the lateral illumination type backlight module, the light utilization rate of the LED is improved, so that the emergent angle of the light emitted from the LED is of 90 degrees, and the light emitted from the LED is guaranteed to completely enter the light guide panel to achieve the aim of uniform backlight emission.

Description

Improve the side incident type module backlight of LED light efficiency

Technical field

The present invention relates to a kind of module backlight, particularly a kind of side incident type module backlight that improves the LED light efficiency.

Background technology

Liquid crystal indicator comprises a liquid crystal panel and a module backlight.This liquid crystal panel is made up of layer glass substrate therebetween one liquid crystal layer, and the outer surface up and down of glass substrate posts polaroid; Because liquid crystal panel itself is not luminous, therefore need module backlight bright dipping uniform surface light source system to be provided for it.The light source that module backlight uses mainly contains CCFL (Cold Cathode Fluorescent Lamp; Cathode fluorescent tube) and LED; Wherein LED has pollution-free, long-life, vibration resistance, shock resistance, low energy consumption, efficient luminous characteristics, is widely used at present.Side incident type LED-backlit module comprises: a metal backing is used to hold and support of optical diaphragm and LED lamp bar; A LGP, this LGP have at least one incidence surface and an exiting surface; At least one LED lamp bar is oppositely arranged with the LGP incidence surface, and this LED lamp bar has an exiting surface towards this LGP incidence surface, is arranged in a side of this LGP at least; One reflector plate, many blooming pieces and a glue frame.Along with the luminous power of single LEDs is increasingly high; The use number of LED is fewer and feweri in the side incident type module backlight, and it is at the arrangement of LGP side: only need arrange respectively that at 4 end points places of LGP a LEDs light source can reach the requirement of backlight illumination.Because LED self has 120 ° luminous angle, and four end points places of LGP are 90 ° of right angles, there is part to fail to enter into LGP in this light that will cause LED to send, make part light waste, cause the light utilization of LED low.

Summary of the invention

Goal of the invention:, the purpose of this invention is to provide the side incident type module backlight of the light utilization of a kind of LED of raising to the problem and shortage that above-mentioned prior art exists.

Technical scheme: for realizing the foregoing invention purpose; The technical scheme that the present invention adopts is a kind of side incident type module backlight that improves the LED light efficiency, comprises LGP and at least one LEDs, and said LGP has at least one incidence surface and an exiting surface; Said LED and LGP incidence surface are oppositely arranged; Said LED has an exiting surface towards said LGP incidence surface, and said LED is positioned at the place, at least one angle of LGP, and the exiting surface of said LED is a convex structure.

Too assemble for the light of avoiding getting into LGP, reach the purpose of even light inlet, can be and the corresponding concave structure of said convex structure with the corresponding LGP incidence surface of the exiting surface of said LED.

Said convex structure can be circular arc or zigzag; Make that the left and right sides beam angle of LED is 90 °; And the exiting surface lateral length of LED makes the upper and lower sides beam angle less than the left and right sides beam angle greater than the structure of longitudinal length, so the light that LED sends can get in the LGP the most efficiently.

Said concave structure can be circular arc or zigzag.

For guaranteeing do not have light from LGP, to overflow, the available reflector plate of said LGP other faces except that incidence surface attaches.

For guaranteeing enough brightness, the quantity of said LED can be 4, and the quantity of said LGP incidence surface is 4.

Beneficial effect: the present invention can improve the light utilization of LED, makes that the beam angle of the light that LED sends is 90 °, ensures that the light that LED sends all enters into LGP, reaches emitting uniform purpose backlight.

Description of drawings

Fig. 1 (A) is LED and the structural representation of LGP of a kind of side incident type module backlight of prior art, and Fig. 1 (B) is the enlarged diagram of Fig. 1 (A) circle part;

Fig. 2 (A) is the LED of the embodiment of the invention 1 side incident type module backlight and the structural representation of LGP, and Fig. 2 (B) is the enlarged diagram of Fig. 2 (A) circle part;

Fig. 3 is the LED of the embodiment of the invention 2 side incident types module backlight and the structural representation of LGP;

Fig. 4 (A) is for the master of LED looks sketch map, and Fig. 4 (B) looks sketch map for the left side of LED;

Fig. 5 (A) is first kind of structural representation of LGP incidence surface, and Fig. 5 (B) is second kind of structural representation of LGP incidence surface.

The specific embodiment

Below in conjunction with accompanying drawing and specific embodiment; Further illustrate the present invention; Should understand these embodiment only be used to the present invention is described and be not used in the restriction scope of the present invention; After having read the present invention, those skilled in the art all fall within the application's accompanying claims institute restricted portion to the modification of the various equivalent form of values of the present invention.

Prior art:

As shown in Figure 1, four jiaos of LGP 1 respectively are provided with a LEDs 2, and the exiting surface of each LED is over against the incidence surface of LGP.(arrow is depicted as the exit direction of rim ray among the figure because the light that sends of LED has beam angle about 120 °; Down together; The angle that can find out two arrows is about 120 °), and the angle of LGP two adjacent edges is the right angle, therefore has part light to fail to enter into LGP.

Embodiment 1:

Shown in Fig. 2 (A) and Fig. 2 (B); The present embodiment difference with the prior art is: the exiting surface of LED is the arc-shaped structure of evagination; Make that the left and right sides beam angle of LED is 90 °; The LGP incidence surface is and the arc-shaped structure (referring to Fig. 5 (A)) of the corresponding indent of exiting surface of LED that the light of avoiding getting into LGP is too assembled, and reaches the purpose of even light inlet.Shown in Fig. 4 (A) and Fig. 4 (B), the exiting surface lateral length of LED make upper and lower sides beam angle (about 60 °) less than left and right sides beam angle (90 °), so the light that LED sends can get in the LGP the most efficiently greater than the structure of longitudinal length.

Embodiment 2:

As shown in Figure 3, the difference of present embodiment and embodiment 1 is: the four edges of LGP except incidence surface all attaches with the reflector plate 3 of strip, and guaranteeing does not have light from LGP, to overflow.

Embodiment 3:

Shown in Fig. 5 (B), the difference of present embodiment and embodiment 2 is: the LGP incidence surface is a zigzag.Because light is assembled when the circular arc exiting surface of LED evagination penetrates, therefore zigzag LGP incidence surface is broken up the incident light of assembling, and makes the equalizing light rays that gets into LGP.

Claims

1. side incident type module backlight that improves the LED light efficiency; Comprise LGP and at least one LEDs; Said LGP has at least one incidence surface and an exiting surface, and said LED and LGP incidence surface are oppositely arranged, and said LED has an exiting surface towards said LGP incidence surface; Said LED is positioned at the place, at least one angle of LGP, and the exiting surface of said LED is a convex structure.

2. according to the side incident type module backlight of the said raising of claim 1 LED light efficiency, it is characterized in that: be and the corresponding concave structure of said convex structure with the corresponding LGP incidence surface of the exiting surface of said LED.

3. according to the side incident type module backlight of the said raising of claim 1 LED light efficiency, it is characterized in that: said convex structure is circular arc or zigzag.

4. according to the side incident type module backlight of the said raising of claim 2 LED light efficiency, it is characterized in that: said concave structure is circular arc or zigzag.

5. according to the side incident type module backlight of the said raising of claim 1 LED light efficiency, it is characterized in that: said LGP other faces except that incidence surface attach with reflector plate.

6. according to the side incident type module backlight of the said raising of claim 1 LED light efficiency, it is characterized in that: the quantity of said LED is 4, and the quantity of said LGP incidence surface is 4.