CN102121623A - A light emitting diode light source structure - Google Patents

Abstract

The invention provides a light source structure of a light emitting diode, which is suitable for a backlight module of a liquid crystal display device and comprises: a supporting cover with a containing space, one side of the supporting cover is provided with a bending wall bending outwards, so that an opening is formed on the side, and a plurality of gaps are arranged at the bending line of the bending wall; the light bar is provided with a plurality of light emitting diodes, the light bar is accommodated in the accommodating space of the supporting cover, and the light emitting diodes face the opening; the adhesive tape is adhered to the upper surface of the bending wall, one side of the adhesive tape is provided with a plurality of convex parts corresponding to the notches, the lower surface of each convex part is provided with an elastic body layer, the lower surface of the elastic body layer is provided with a reflecting layer, and the convex parts extend into the supporting cover from the notches corresponding to the convex parts to cover the light-emitting diodes; a frame adhered to the bent wall of the support cover by an adhesive tape. The light-emitting diode light source structure provided by the invention can avoid the phenomenon of uneven development caused by light leaking from the gap.

Description

A light emitting diode light source structure

technical field

The invention relates to a light source structure, in particular to a light emitting diode light source structure suitable for a backlight module of a liquid crystal display device.

Background technique

With the development of technology and the advent of the digital age, the liquid crystal display market is booming. Liquid crystal displays have many advantages such as high image quality, small size, light weight, low driving voltage and low power consumption. Therefore, it is widely used in consumer communication or electronic products such as personal digital assistants (PDAs), mobile phones, video recorders, notebook computers, desktop monitors, car monitors, and projection TVs, and gradually replaces cathodes. Ray tubes became the mainstream of displays.

In order to meet the needs of light and thin LCD, the light source will be placed on the side of the panel. At present, the widely used light source is light-emitting diode, which has the advantages of energy saving, environmental protection, long life, low power consumption, low heat, high brightness, and miniature. The backlight module structure of the known liquid crystal display device includes a light bar, on which there are a plurality of light emitting diodes as light sources, a support cover, a light guide plate and other necessary optical films, frames and adhesive tapes for fixing. Wherein, the light guide plate is clamped in the opening of the support cover, and the light-emitting surface of the light-emitting diode is close to the side section of the light guide plate to emit light, so that the light source emitted by the light-emitting diode can be transmitted and diffused through the light guide plate, so that the backlight module can be effectively used. . The adhesive tape is used to fix the support cover and the frame so that the two can be effectively combined.

However, due to factors such as the manufacturing tolerance of the LED, the shape tolerance of the printed circuit board or the flexible circuit board, and the radius of the naturally formed arc at the bend of the support cover, it is often difficult to accurately align the position of the LED with the center of the light guide plate. When the position of the light-emitting diode cannot be correctly matched with the light guide plate, the light emitted by it will escape from the gap between the light guide plate and the support cover, and cannot be scattered through the light guide plate. The upper edge jumps out, forming uneven development (mura), which affects the display quality.

The currently commonly used method to reduce uneven development is to reduce the distance between LEDs, but this method will inevitably increase the number of LEDs arranged, and the cost will also increase proportionally. Secondly, microstructures are added to the plane of the light-incident side of the light guide plate, but the injection of the microstructures is not easy to control during the production process of the light guide plate, and cannot be 100% formed, and this production process must increase the cost of mold manufacturing.

Therefore, how to improve the existing light source structure so as to eliminate the phenomenon of uneven development has become an urgent problem to be solved in the industry.

Contents of the invention

In view of this, the object of the present invention is to provide a light emitting diode light source structure for eliminating uneven development.

According to an embodiment of the present invention, a light emitting diode light source structure is proposed, which is suitable for a backlight module of a liquid crystal display device, comprising: a support cover with an accommodating space, one side of the support cover has an outwardly bent The wall is bent to form an opening on the side, and there are multiple gaps at the bending line of the bent wall; a light bar has a plurality of light-emitting diodes on it, and the light bar is accommodated in the accommodation space of the support cover, and the light-emitting diodes face Opening; an adhesive tape, pasted on the upper surface of the bent wall, has a plurality of protrusions corresponding to the gap on one side, each protrusion has an elastic body layer on the lower surface, and the elastic body layer has a lower surface The reflective layer, the protruding part protrudes from the corresponding gap into the support cover to cover the light emitting diode; and a frame, which is bonded with the bending wall of the support cover by adhesive tape.

Preferably, the LED light source structure further includes a light guide plate, extending into the support cover from the opening of the support cover, and closely adhering to the light emitting diodes.

Preferably, the light guide plate is covered with an optical film.

Preferably, the light strip is a rigid printed circuit board.

Preferably, the light strip is a flexible circuit board.

Preferably, the protrusion has the same width as the notch.

The advantage of using the light-emitting diode light source structure provided by the present invention is that the unevenness of the support cover can be avoided by squeezing the elastomer layer of the protruding part of the tape, so that the adhesive tape and the light guide plate are tightly bonded, eliminating the need for support between the support cover and the light guide plate. When the light-emitting diode assembly position is not good, the light can be reflected back to the light guide plate through the reflective layer of the tape covering it, so as to avoid the light from leaking from the gap between the light guide plate and the support cover and cause uneven development Phenomenon.

Description of drawings

In order to make the above and other objects, features, advantages and embodiments of the present invention more comprehensible, the detailed description of the accompanying drawings is as follows:

FIG. 1 is a schematic diagram illustrating the structure of a light source of an existing liquid crystal display device;

2 is a schematic diagram of a support cover according to an embodiment of the present invention;

FIG. 3 shows a schematic diagram of an adhesive tape according to an embodiment of the present invention;

Fig. 4a shows a cross-sectional view of a light source structure according to an embodiment of the present invention; and

Fig. 4b shows another cross-sectional view of a light source structure according to an embodiment of the present invention.

Detailed ways

The following will clearly illustrate the spirit of the present invention with the accompanying drawings and detailed descriptions. After understanding the preferred embodiments of the present invention, any person of ordinary skill in the art can make changes and modifications based on the technology disclosed in the present invention, and without departing from the spirit and scope of the present invention.

Please refer to FIG. 1 , which shows a schematic diagram of a light source structure of a conventional liquid crystal display device. The light guide plate 100 is used for refracting and diffusing the light incident from the light source and emitting it uniformly. There is an accommodating space inside the supporting cover 102 for accommodating the light bar 104 . On one side of the support cover 102, there is a bent wall 110 that is horizontally bent outward, thereby forming an opening on the side, and the light guide plate 100 is clamped in the opening and extends into the support cover 102, and the light guide plate 100 is covered There are various optical films 112 for displaying colors. The light strip 104 is a strip-shaped hard printed circuit board or flexible circuit board, on which a plurality of light emitting diodes 108 are evenly arranged at a certain distance as light sources, and the light emitting diodes 108 are arranged toward the opening and abut against the light guide plate 100, thereby The light is injected into the light guide plate 100 and diffused evenly. A layer of double-sided adhesive tape 116 is pasted on the upper surface of the bending wall 110 to effectively combine the frame 118 with the support cover 102 .

In an ideal state, the horizontal positions of the light guide plate 100 and the light-emitting diodes 108 are aligned, and the processing size of the support cover 102 matches the thickness of the light guide plate 100 , then all the light emitted by the light-emitting diodes 108 enters the light guide plate 100 . However, in actual situations, affected by factors such as the manufacturing tolerance of the light-emitting diode 108, the shape tolerance of the printed circuit board or the flexible circuit board, and the radius of the naturally formed arc at the bend of the support cover 102, the bending wall 110 of the support cover 102 is in contact with the guide. A horizontal gap 106 will be formed between the upper surfaces of the light plate 100, and at the same time, the light emitting surface of the light emitting diode 108 will be slightly higher than the side of the light guide plate 100, then the light emitted by the part of the light emitting diode 108 higher than the side of the light guide plate 100 will be emitted from the light guide plate 100 is emitted from the gap 106 between the upper surface of the support cover 102 and cannot be refracted by the light guide plate 100, thus forming uneven development (mura) and affecting the display quality.

Next, please refer to FIG. 2 , which shows a schematic diagram of a support cover according to an embodiment of the present invention. There is an accommodating space inside the supporting cover 102 for accommodating the light bar 104 . A side surface of the supporting cover 102 has a bent wall 110 horizontally bent outward, thereby forming an opening on the side surface, and the light guide plate 100 is clamped in the opening and protrudes into the supporting cover 102 . There are a plurality of notches 200 evenly distributed at a certain distance at the bending line of the bending wall 110 .

Please refer to FIG. 3 , which shows a schematic diagram of an adhesive tape according to an embodiment of the present invention. The adhesive tape 116 is pasted on the upper surface of the bending wall 110, and its side has a plurality of protrusions 300 evenly distributed at a certain distance, and these protrusions 300 correspond to the gaps 200 of the support cover 102 shown in FIG. 2 one by one. , and the width of the protrusion 300 is the same as the width of the notch 200 . The lower surface of each protrusion 300 has an elastomer layer 302, and the lower surface of the elastomer layer also has a reflective layer 304. The protrusion 300 extends into the support cover 102 from the corresponding notch 200 and covers the A portion of light emitting diodes 108 .

Next, please refer to FIG. 4 a , which shows a cross-sectional view of a light source structure according to an embodiment of the present invention. There is an accommodating space inside the supporting cover 102 for accommodating the light bar 104 . A side surface of the supporting cover 102 has a bent wall 110 horizontally bent outward, thereby forming an opening on the side surface, and the light guide plate 100 is clamped in the opening and protrudes into the supporting cover 102 . The light guide plate 100 is covered with various optical films 112 for displaying colors. The light strip 104 is a strip-shaped hard printed circuit board or flexible circuit board, on which a plurality of light emitting diodes 108 are evenly arranged at a certain distance as light sources, and the light emitting diodes 108 are arranged toward the opening and abut against the light guide plate 100, thereby The light is injected into the light guide plate 100 and diffused evenly. There are a plurality of notches 200 evenly distributed at a certain distance at the bending line of the bending wall 110 . Adhesive tape 116 is pasted on the upper surface of bending wall 110, in order to effectively combine frame 118 and support cover 102, and its side has a plurality of protrusions 300 evenly distributed at regular intervals, these protrusions 300 and support cover 102 The notches 200 correspond one-to-one, and the width of the protrusion 300 is the same as the width of the notch 200 . The lower surface of each protrusion 300 has an elastomer layer 302, and the lower surface of the elastomer layer also has a reflective layer 304. The protrusion 300 extends into the support cover 102 from the corresponding notch 200 and covers the A portion of light emitting diodes 108 .

After the assembly of the light source structure is completed, the frame 118 will exert pressure on the adhesive tape 116, so that the elastomer layer 302 of the protrusion 300 is in a compressed state. When the light emitting diode 108 is aligned with the horizontal position of the light guide plate 100, the The elastic body layer 302 can avoid the unevenness of the support cover 102 so as to eliminate the gap 106 shown in FIG. 1 , so that light will not leak out and cause uneven development.

Please refer to FIG. 4 b , which shows another cross-sectional view of a light source structure according to an embodiment of the present invention. When the light-emitting surface of the light-emitting diode 108 is slightly higher than the side of the light guide plate 100, the light-emitting diode 108 will push up the protruding portion 300 of the adhesive tape 116 covering it, and the reflective layer 304 can emit it. The light is reflected back to the light guide plate 100 to avoid light leakage.

The advantage of using the light-emitting diode light source structure provided by the present invention is that the unevenness of the support cover can be avoided by squeezing the elastomer layer of the protruding part of the tape, so that the adhesive tape and the light guide plate are tightly bonded, eliminating the need for support between the support cover and the light guide plate. When the light-emitting diode assembly position is not good, the light can be reflected back to the light guide plate through the reflective layer of the tape covering it, so as to avoid the light from leaking from the gap between the light guide plate and the support cover and cause uneven development Phenomenon.

Although the present invention has been disclosed above in terms of implementation, it is not intended to limit the present invention. Any person skilled in the art may make various modifications and modifications without departing from the spirit and scope of the present invention. Therefore, The scope of protection of the present invention should be defined by the scope of the appended patent application.

Claims (6)

1. A light-emitting diode light source structure, which is applicable to the backlight module of a liquid crystal display device, is characterized in that, the light source structure comprises at least: A support cover having an accommodating space, one side of the support cover has a bent wall bent outward, so as to form an opening on the side, and a plurality of gaps are formed at the bending line of the bent wall; a light bar with a plurality of light emitting diodes on it, the light bar is accommodated in the accommodating space of the support cover, and the light emitting diodes face the opening; An adhesive tape, pasted on the upper surface of the bent wall, has a plurality of protruding parts corresponding to the notch on one side, and has an elastomer layer on the lower surface of each of the protruding parts, and the elastic body The lower surface of the layer has a reflective layer, and the protruding part protrudes from the corresponding gap into the supporting cover to cover the light emitting diode; and A frame bonded to the bent wall of the support cover by the adhesive tape. 2. The light-emitting diode light source structure according to claim 1, characterized in that, the light-emitting diode light source structure further comprises a light guide plate, extending into the support cover from the opening of the support cover, and clinging to the light emitting diodes. 3. The LED light source structure according to claim 2, wherein the light guide plate is covered with an optical film. 4. The LED light source structure according to claim 1, wherein the light strip is a rigid printed circuit board. 5. The LED light source structure according to claim 1, wherein the light strip is a flexible circuit board. 6 . The light emitting diode light source structure according to claim 1 , wherein the width of the protrusion is the same as that of the notch. 6 .

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