CN1629690A - Light source device and its backlight module - Google Patents

Abstract

A light source device includes a plurality of point light sources with at least two different emission colors and a fiber coupling device. The fiber coupling device includes a plurality of input ends and output ends, and the plurality of input ends are arranged opposite to the plurality of point light sources. The light source device can emit uniform variable color light.

Description

Light source device and its backlight module

【Technical field】

The invention relates to a light source device and a backlight module using the light source device.

【Background technique】

Backlight modules are widely used in display devices, such as liquid crystal displays, mobile phones, etc., but many display devices are non-self-illuminating displays, and the display function is mainly realized by controlling the passage or non-passage of light emitted by an external light source, so corresponding backlight or front lights are required. Light module, the backlight or front light module can guide the light emitted by the external light source to the display panel to realize the display function.

Please refer to FIG. 1 , which is a schematic side view of a prior art backlight module. The backlight module 1 includes a light guide plate 10 and a light source 11 , the light guide plate 10 includes a light incident surface 12 and a light output surface 13 , and the light source 11 is disposed opposite to the light incident surface 12 . The function of the light guide plate 10 is to guide the propagation direction of the light incident on the light guide plate 10 through the light incident surface 12 , so that the light is uniformly emitted from the light exit surface 13 of the light guide plate 10 . However, the backlight module 1 can only emit light of one color, and cannot meet the requirement of variable display colors when applied to display devices such as mobile phones that need to change colors.

Please refer to FIG. 2 , which is a schematic side view of a backlight module applied to a current mobile phone with variable display colors. The backlight module 2 includes a light guide plate 20 and a plurality of point light sources 211, 212, 213, 214, 215, 216. The light guide plate 20 includes two opposite light incident surfaces 22, 24 and a light output surface 23. The point light sources 211, 212, 213, 214, 215, and 216 are light emitting diodes (Light Emitting Diodes, LEDs) with different light emitting colors, which are respectively arranged opposite to the two light incident surfaces 22, 24. When working, according to the requirements of different display colors, the corresponding point light sources are selected and turned on through electronic signals, so as to achieve the function of variable display colors. However, when more colors are displayed, the required point light sources also increase correspondingly, which increases the cost, and the different display colors of the backlight module 2 are obtained through point light sources 211, 212, 213, 214, 215, 216 at different positions. Therefore, the display effect of the entire backlight module 2 is not uniform.

【Content of invention】

In order to overcome the disadvantages of high cost of the prior art variable light emitting color light source device, the present invention provides a low cost variable light emitting color light source device.

In order to overcome the shortcoming of the high cost of the variable light emitting color backlight module in the prior art, the present invention provides a low cost variable light emitting color backlight module.

The technical solution adopted by the present invention to solve the technical problem is: a light source device, including a plurality of point light sources with at least two different luminous colors and an optical fiber coupling device, the optical fiber coupling device includes a plurality of input ends and output ends, the plurality of The input terminals are arranged relative to the plurality of point light sources.

The technical solution adopted by the present invention to solve the technical problem is to provide a backlight module, including a light source device and a light guide plate, the light guide plate includes a light incident surface, and the light source device includes a plurality of A point light source and a fiber coupling device, the fiber coupling device includes a plurality of input ends and output ends, the plurality of input ends are arranged relative to the plurality of point light sources, and the plurality of output ends are arranged opposite to the light incident surface.

Compared with the prior art, the beneficial effect of the present invention is: using the optical fiber coupling device to form multiple light sources into the light guide plate, making the incident light more uniform and helping the backlight module to emit light evenly; through electronic signal selection, Light sources of different colors can be combined to enter the light guide plate to produce a backlight module with variable light color; and the present invention only uses one point light source of different light colors to emit light of various colors, avoiding the use of many different colors Point light sources, thus saving costs.

【Description of drawings】

FIG. 1 is a schematic side view of a prior art backlight module.

Fig. 2 is a schematic side view of another backlight module in the prior art.

FIG. 3 is a schematic side view of the first embodiment of the backlight module of the present invention.

FIG. 4 is a schematic front view of the first embodiment of the backlight module of the present invention.

FIG. 5 is a schematic front view of the second embodiment of the backlight module of the present invention.

【Detailed ways】

Please refer to FIG. 3 and FIG. 4 together, which are respectively a side schematic view and a front schematic view of the first embodiment of the backlight module of the present invention. The backlight module 3 includes a light guide plate 30 and a light source device 31, the light guide plate 30 includes a light incident surface 32 and a light output surface 33, the light source device 31 includes a plurality of point light sources 311, 312, 313, 314 and optical fibers The coupling device 34 , the multiple point light sources 311 , 312 , 313 , 314 are composed of light emitting diodes of different light colors, including blue light emitting diodes 311 , red light emitting diodes 312 , white light emitting diodes 313 and green light emitting diodes 314 . The optical fiber coupling device 34 is a multi-to-multiple optical fiber coupler, which is formed by winding multiple optical fibers and then fused at high temperature. 312, 313, 314; the fiber coupling device 34 also includes a plurality of output ends 345, 346, 347, 348, and the plurality of output ends 345, 346, 347, 348 are arranged relative to the light incident surface 32 of the light guide plate 30, and are lenses structure. The optical fiber coupling device 34 is made of high-purity glass spinning material, and can also be made of heat-resistant plastic, and its fiber radius is less than 1000 microns. Wherein the point light sources 311 , 312 , 313 , 314 and the input ends 341 , 342 , 343 , 344 of the fiber coupling device 34 are designed as proximity coupling light sources.

After the light is emitted from one or more of the point light sources 311, 312, 313, 314, it enters the optical fiber coupling device 34 through the input ports 341, 342, 343, 344 for coupling, and passes through the output ports 345, 346, 347, 348. The function of the lens structure makes the light converge and enter the light guide plate 30 through the light incident surface 32 , and is transformed by the light guide plate 30 , finally forming a plane light and exiting from the light exit surface 33 . Because the light emitted from the point light sources 311, 312, 313, 314 enters the light guide plate 30 from multiple branches at the light incident surface 32, it is equivalent to forming multiple point light sources, making the incident light more uniform; in addition, the coupling device can The light emitted by different light sources is effectively coupled, and the color, purity, and brightness of multiple light-emitting points after coupling can achieve high consistency, making the light output of the light guide plate more uniform and richer in color. The electronic signal is controlled by a driving device (not shown in the figure), and point light sources of different colors are selected to guide the colored light into the light guide plate 30 to form a backlight module 3 with variable light color; To a certain degree, light sources of other colors are combined by using the lightness and darkness of different color light sources, so that the variable colors of the backlight module 3 are more abundant.

Please refer to FIG. 5 , which is a schematic front view of the second embodiment of the backlight module of the present invention. The backlight module 4 includes a light guide plate 40 and a light source device 41, the light guide plate 40 includes a light incident surface 42 and a light output surface 43, the light source device 41 includes a plurality of point light sources 411, 412, 413 and fiber coupling devices 44. The plurality of point light sources 411, 412, and 413 are composed of light-emitting diodes with different light-emitting colors, including blue light-emitting diodes 411, red light-emitting diodes 412, and green light-emitting diodes 413. The optical fiber coupling device 44 is composed of a plurality of one-to-multiple optical fiber couplers 441, 442, 443, which are formed by winding multiple optical fibers and then fused at high temperature. The optical fiber couplers 441, 442, 443 respectively include an input end 4411 . In a certain area of the surface 42, at the light incident surface 42, they are respectively coupled by fiber couplers 445, 446, 447 to form a certain color light. The output ends of the multiple fiber couplers 445, 446, 447 are relatively The optical surface 42 is provided and is a lens structure. The optical fiber coupling device 44 is made of high-purity glass spinning material, and can also be made of heat-resistant plastic, and its fiber radius is less than 1000 microns. Wherein the point light sources 411, 412, 413 and the input ends 4411, 4421, 4431 are designed as proximity coupling light sources.

The backlight module of the present invention is not limited to the above-mentioned structure, for example: the shape of the light guide plate can also be wedge-shaped, bent or arc-shaped; the output end of the light-guiding fiber can also be a groove structure; the light source can also be a laser Diode; in order to enhance the brightness and uniformity of the light output of the backlight module, a diffuser plate and a prism sheet can be arranged on the light output surface adjacent to the light guide plate.

Claims (10)

1. A light source device, comprising a plurality of point light sources with at least two different luminescent colors, characterized in that: the light source device also includes a fiber coupling device, the fiber coupling device includes a plurality of input ports and output ports, the plurality of The input end is set relative to the plurality of point light sources. 2. The light source device according to claim 1, wherein the point light source is at least two of red light source, blue light source, green light source or white light source. 3. The light source device according to claim 2, wherein the point light source is at least two kinds of red light emitting diodes, blue light emitting diodes, green light emitting diodes or white light emitting diodes. 4. The light source device according to claim 2, wherein the point light source is at least two kinds of red laser diodes, blue laser diodes, green laser diodes or white laser diodes. 5. The light source device according to claim 1, wherein the fiber coupling device is composed of a plurality of one-to-many fiber couplers or many-to-many fiber couplers. 6 . The light source device according to claim 1 , wherein the optical fiber coupling device is made of fiberglass material or heat-resistant plastic optical fiber. 7. The light source device according to claim 1, wherein the fiber radius of the fiber coupling device is less than 1000 microns. 8. The light source device according to claim 1, wherein the output end of the fiber coupling device is a lens structure or a groove structure. 9. The light source device according to claim 1, further comprising a driving device for controlling electronic signals. 10. A backlight module, comprising a light source device and a light guide plate, the light guide plate includes a light-incident surface, the light source device includes a plurality of point light sources with at least two different luminous colors, it is characterized in that: the light source device also It includes a fiber coupling device, the fiber coupling device includes a plurality of input ends and output ends, the plurality of input ends are arranged relative to the plurality of point light sources, and the plurality of output ends are arranged relative to the light incident surface.

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