TWM466278U - Thinized direct type LED backlight module - Google Patents

Description

Thinized direct type LED backlight module

The present invention belongs to the technical field of backlight modules, and particularly relates to a thin-type direct-lit LED backlight module, which achieves uniform light mixing effect under the combined structure of a light-emitting diode, a lens and a light guide plate.

Since the liquid crystal display is a passive display device that does not have a self-illuminating function, a backlight module needs to be added to provide a display light source required for the display panel. Thus, whether the surface light source generated by the backlight module has sufficient and uniform brightness is directly Affect the display quality of liquid crystal displays. In addition, the LED has the characteristics of high luminous efficiency, long life and low power consumption, and has become the first choice for the application of the backlight module. Currently, the backlight module can be classified into an edge light type and a direct type (Direct) according to its structure. Lighting) two. Wherein, the direct type backlight module arranges a plurality of LED light sources through a matrix or parallelly arranges a plurality of LED light tubes on a back plate, and then reflects the light source upwards through the reflection plate on the back plate, and then uniformly disperses through the diffusion plate, with a view to A flat uniform light-emitting effect is obtained on the light-emitting surface. Therefore, the direct type backlight module has a high luminance, a good light viewing angle, and a high light utilization efficiency, and is suitable for an oversized display, but requires a quantity. More LED light sources or LED tubes and larger light source placement spaces result in an increase in the overall thickness, weight and power consumption of the module, which is not conducive to the current miniaturization of electronic products and environmental protection and energy conservation.

As shown in FIG. 1 , it is a structural cross-sectional view of a conventional direct type backlight module. The backlight module 1 is provided with a plurality of LEDs 10 , a plurality of lenses 11 , a plurality of reflecting surfaces 12 , and a light emitting surface 13 . The LEDs 10 are arranged in a matrix below the light-emitting surface 13 . The reflective surfaces 12 are respectively disposed on the lower sides of the light-emitting surface 13 , and the lenses 11 respectively cover the corresponding LEDs 10 . The light emitted by the LEDs 10 is guided to the sides of the backlight module 1 by the refracting or reflecting optical effects, that is, the reflecting surfaces 12 are emitted. A light mixing space 14 is disposed between the lens 11 and the light emitting surface 13 , and after the reflecting surface 12 further reflects the light emitted by the LEDs 10 , the light emitted by the LEDs 10 is mixed. The space 14 is mixed with air using a medium as a medium, so that the light-emitting surface 13 produces a uniform illumination effect. In other words, the backlight module 1 needs to have a certain space for the light mixing space 14 to generate uniform illumination brightness. If the distance between the lens 11 and the light exit surface 13 is reduced for thinning the product, each of the LEDs 10 will As shown in FIG. 2 to FIG. 4, the luminance projected onto the light-emitting surface 13 between the light-emitting angles of +20 degrees and -20 degrees exhibits an uneven distribution state and affects the light-mixing effect, so that the light-emitting surface 13 has a dark spot, which seriously affects The illumination quality of the backlight module 1.

In view of this, how to improve the structure of the backlight module to form an excellent planar uniform light-emitting effect by using different component combinations, and having the characteristics of thinning, high light intensity, environmental protection and energy saving, etc., so as to benefit the liquid crystal display The further development of the industry and the higher economic value is the subject that the creative office wants to solve.

In view of the problems of the prior art, the purpose of the present invention is to provide a thin-type direct-lit LED backlight module, which uses a light guide plate instead of the conventional air as a light-mixing medium to reduce the thickness of the cavity of the module, which is in line with the current electronic industry. The concept of development of thin and light products.

According to the purpose of the present invention, the thinned direct type LED backlight module is provided with at least one substrate, a plurality of light emitting diodes and a plurality of lenses, and the light emitting diodes are disposed on the substrate, and each of the light emitting diodes is disposed on the substrate The lens is disposed to correspond to the light-emitting diode for conducting an optical action to guide the light path of the light emitted by the light-emitting diodes to realize light on one of the light-emitting surfaces of the thin-type direct-lit LED backlight module The light-emitting effect of the uniform intensity distribution is characterized in that: the thinned direct-type LED backlight module is provided with a light guide plate, and the light guide plate is provided with a plurality of grooves corresponding to the positions of the light-emitting diodes for accommodating the light-emitting diodes The equal-lens and the light-emitting diodes are configured such that the light emitted by each of the light-emitting diodes is guided by the lens, and then uniformly distributed to the light-emitting surface by using the light guide plate as a transmission medium.

Each of the grooves is disposed in an arc shape or a square shape corresponding to one side of each of the light-emitting diodes. The bottom end of the light guide plate is disposed at a distance of 0 to 1 cm (cm) from the top surface of the substrate, and the light emitting diodes are spaced apart from each other on the substrate at a pitch of 0 to 20 cm.

In summary, the present invention uses the light guide plate as a light mixing medium to have excellent light path divergence capability, so that the LED backlight module 2 can use only the original one-half of the number of the light-emitting diodes. It has excellent luminous efficiency under the conditions of high economic efficiency and environmental protection benefit, and the light transmission coefficient of the light guide plate and the structural design of the grooves can reduce the distance required for light mixing, so as to effectively reduce the module. The thickness of the cavity is only one-fifth of the thickness of the conventional direct-lit backlight module, which is beneficial to the development of thin products.

Conventional technology

1‧‧‧Backlight module

10‧‧‧LED

11‧‧‧ lens

12‧‧‧reflecting surface

13‧‧‧Glossy

14‧‧‧Hybrid space

This creation

2‧‧‧LED backlight module

20‧‧‧ cavity

200‧‧‧Substrate

201‧‧‧Lighting diode

202‧‧‧ lens

2020‧‧‧ convex

203‧‧‧Light guide plate

2030‧‧‧ Groove

21‧‧‧Glossy

210‧‧‧Optical film

211‧‧‧Diffuser

Fig. 1 is a cross-sectional view showing the structure of a conventional direct type backlight module.

Figure 2 is a light distribution curve of a conventional direct type backlight module.

Figure 3 is a horizontal luminance curve of the light-emitting surface of a conventional direct-lit backlight module.

Figure 4 is a vertical luminance curve of the light-emitting surface of a conventional direct-lit backlight module.

Figure 5 is a cross-sectional view showing the structure of an embodiment of the preferred embodiment of the present invention.

Figure 6 is a schematic view showing the structure of the second embodiment of the preferred embodiment of the present invention.

Figure 7 is a cross-sectional view showing the structure of the second embodiment of the preferred embodiment of the present invention.

Figure 8 is a light distribution graph of the second embodiment of the preferred embodiment of the present invention.

Figure 9 is a graph showing the horizontal luminance of the exit surface of the second embodiment of the preferred embodiment.

Fig. 10 is a vertical luminance curve of the light-emitting surface according to the second embodiment of the preferred embodiment of the present invention.

In order for your review board to have a clear understanding of the contents of the present invention, please refer to the following description for matching drawings.

Please refer to FIG. 5, which is a cross-sectional view showing the structure of an embodiment of the preferred embodiment of the present invention. As shown in the figure, the thin-type direct-lit LED backlight module 2 is composed of a cavity 20 and a light-emitting surface 21, and the cavity 20 is provided with at least one substrate 200 and a plurality of light-emitting diodes 201. And a plurality of lenses 202 and a light guide plate 203 for enhancing the optical path distribution of the light emitted by the light emitting diodes 201 through the optical functions of the lenses 202 and the light guide plate 203, so as to reduce the height of the cavity 20 Still has an excellent blending effect. The light emitting diodes 201 are mounted on the substrate 200. Each of the lenses 202 is provided with the corresponding light-emitting diode 201 for guiding the optical path of the light emitted by the light-emitting diodes 201 to perform an optical action, so as to achieve uniform distribution of light intensity on the light-emitting surface 21. Light effect. The light guide plate 203 is provided with a plurality of grooves 2030 corresponding to the positions of the light-emitting diodes 201 for accommodating the lenses 202 and the light-emitting diodes 201, and each of the grooves 2030 corresponds to the light-emitting diodes. One side of the light exiting portion of the diode 201 is arcuate or square, so that the light emitted by the light emitting diode 201 is guided by the lens 202, and then uniformly distributed to the light emitting surface 21 by using the light guide plate 203 as a transmission medium. . In this way, the light guide plate 203 replaces the light mixing space reserved by the conventional backlight module, that is, the light guide plate 203 is designed to form an optical transmission medium having a better light guiding effect than the conventional air medium. An excellent light mixing effect can be obtained even when the light emitted by the light-emitting diodes 201 has a short optical path distance.

Please refer to FIG. 6 and FIG. 7 together, which are respectively a structural schematic view and a structural cross-sectional view of the second embodiment of the preferred embodiment. As shown in the figure, the LEDs 201 are placed on the substrate 200 at a distance X between 0 and 20 cm, and the bottom end of the light guide plate 203 and the top surface of the substrate 200 are 0 to 1 cm. Height H is set apart. At least one optical film (BEF) 210 and a diffusing plate 211 are stacked on the light-emitting surface 21, and a convex portion 2020 is disposed at the center of the top side of each of the lenses 202, and each of the grooves 2030 is disposed in a tapered space. The top side has a concave-toothed curved surface, so that the light emitted from the center of the light-emitting diode 201 is dispersed by the convex portion 2020 and re-assembled by the concave teeth of the groove 2030, and the optical film 210 and the diffusion are used. The plate 211 further disperses the optical path to enhance the light intensity while enhancing the uniformity of the light-emitting surface 21 as shown in FIGS. 8-10.

The above description is only illustrative of preferred embodiments and not limiting. Any equivalent modification or change to the spirit and scope of this creation shall be included in The scope of the patent application is attached.

2‧‧‧LED backlight module

20‧‧‧ cavity

200‧‧‧Substrate

201‧‧‧Lighting diode

202‧‧‧ lens

203‧‧‧Light guide plate

2030‧‧‧ Groove

21‧‧‧Glossy

Claims (4)

A thin-type direct-lit LED backlight module is provided with at least one substrate, a plurality of light-emitting diodes and a plurality of lenses, wherein the light-emitting diodes are disposed on the substrate, and each of the lenses is covered The light-emitting diodes are configured to perform an optical action to guide the optical path of the light emitted by the light-emitting diodes, so as to achieve uniform distribution of light intensity on one of the light-emitting surfaces of the thin-type direct-lit LED backlight module. The light-emitting effect is characterized in that: the thin-type direct-lit LED backlight module is provided with a light guide plate, and the light guide plate is provided with a plurality of grooves corresponding to the positions of the light-emitting diodes for accommodating the lenses and the The light-emitting diodes are arranged such that the light emitted by the light-emitting diodes is guided by the lens, and then uniformly distributed to the light-emitting surface by using the light guide plate as a transmission medium. The thinned direct type LED backlight module of claim 1, wherein each of the grooves is curved or squared corresponding to one side of each of the light emitting diodes. The thinned direct type LED backlight module of claim 1, wherein the bottom end of the light guide plate is disposed at a distance of 0 to 1 cm from a top surface of the substrate. The thinned direct type LED backlight module of claim 1, wherein the light emitting diode systems are spaced apart from each other on the substrate at a pitch of 0 to 20 cm.