BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 (Prior Art) is a perspective view of a conventional LED light source;
FIG. 2 is a side view of a light device according to a first embodiment of the invention;
FIG. 3A is a perspective view of the holding structure in FIG. 2A;
FIG. 3B is a perspective view of another holding structure;
FIG. 4A is a front view of the light device in FIG. 2 with aligned LEDs;
FIG. 4B is a front view of the light device in FIG. 2 with alternated LEDs;
FIG. 5A is a front view of a light device according to a second embodiment of the invention;
FIG. 5B is a side view of the light device in FIG. 5A;
FIG. 6 is a front view of a light device according to a third embodiment of the invention; and
FIG. 7 shows the light device in FIG. 2 used as a backlight source of a side-type backlight module.
DETAILED DESCRIPTION OF THE INVENTION
In the following embodiments of the invention, a holding structure is used for positioning at least two light bars whose color lights have different colors, such that the light bars are parallel to and obliquely faces each other, and the lights with different colors are emitted into the light-mixing area to form a color-mixing light. A light device, which mixes three lights with three colors including the red light, the green light, and the blue light to form a white light, is exemplified below.
Referring to FIG. 2, a side view of a light device according to a first embodiment of the invention is shown. The light device 20 includes a red light bar 220, a green light bar 240, a blue light bar 260, and a holding structure 200. The holding structure 200 includes a first positioning portion, a second positioning portion, and a third positioning portion. The second positioning portion is adjacent to the first positioning portion, and the third positioning portion is adjacent to the second positioning portion. The first positioning portion is for positioning the red light bar 220, the second positioning portion is for positioning the green light bar 240, and the third positioning portion is for positioning the blue light bar 260, such that the red light bar 220, the green light bar 240, and the blue light bar 260 are disposed in parallel and obliquely face each other in pair.
Referring to FIG. 2, FIGS. 4A and 4B, preferably, the red light bar 220 includes a number of red light emitting diodes (LEDs) 222 extended along a first direction D1 in equal distance. The green light bar 240 includes a number of green light LEDs 242 extended along the first direction D1 in equal distance. The blue light bar 260 includes a number of blue light LEDs 262 extended along the first direction D1 in equal distance. As the red light, the green light, and the blue light are mixed to form a white light, the light device of the first embodiment is a white light bar extended along the first direction. Furthermore, the arrangement of every two different colored LEDs of the red light LED 222, the green light LED 242, and the blue light LED 262 can be aligned or alternated. As indicated in FIG. 4A, each red light LED 222 is aligned with the neighboring green light LED 242, and each green light LED 242 is aligned with the neighboring blue light LED 262, such that the red light LED 222, the green light LED 242, and the blue light LED 262 are aligned. As indicated in FIG. 4B, each green light LED 442 is positioned between two adjacent red light LEDs 422 and between two adjacent blue light LEDs 462, such that the red light LED 422, the green light LED 442, and the blue light LED 462 are alternated.
Referring to both FIG. 2 and FIG. 3A, FIG. 3A is a perspective view of the holding structure in FIG. 2. As indicated in FIG. 3A, the first positioning portion preferably has a number of first positioning holes 202a correspondingly engaged with a number of red light LEDs 222; the second positioning portion 204 preferably has a number of second positioning holes 204a correspondingly engaged with a number of green light LEDs 242; the third positioning portion 206 preferably has a number of third positioning holes 206a correspondingly engaged with a number of blue light LEDs 262. The holding structure 200 in FIG. 3A is a multi-angled structure and includes a first positioning piece 202, a second positioning piece 204, and a third positioning piece 206. The holding structure 200 has a light-mixing area positioned among the first positioning piece 202, the second positioning piece 204, and the third positioning piece 206. That is, the light-mixing area is enclosed by the first positioning piece 202, the second positioning piece 204, and the third positioning piece 206. The holding structure 200 further has a reflective surface 201 for reflecting the light to the light-mixing area. As indicated in FIG. 3A, the first positioning piece 202 and the second positioning piece 204 are connected to each other and have a first adjustable included angle A1; the second positioning piece 204 and the third positioning piece 206 are connected to each other and have a second adjustable included angle A2. The dimension of the first adjustable included angle A1 and the dimension of the second adjustable included angle A2 are adjusted according to the purposes, such that the area of the light-mixing area and the intensity of the light are adjusted accordingly. The larger the included angle is, the smaller the light-mixing area and the stronger the intensity of the light will be. The smaller the included angle is, the larger the area of the light-mixing area and the weaker the intensity of the light will be.
Referring to FIG. 3B, a perspective view of another holding structure is shown. The holding structure 300 in FIG. 3B is a curved sheet structure and includes a curved positioning piece 310 and a number of first positioning holes 302a, second positioning holes 304a, and third positioning holes 306a correspondingly engaged with a number of red light LEDs 222, green light LEDs 242, and blue light LEDs 262 of FIG. 2, respectively. The light-mixing area of the holding structure 300 is an area enclosed by the curved sheet structure. As indicated in FIG. 3B, the curvature of the curved sheet structure is adjusted according to the purposes, such that the area of he light-mixing area and the intensity of the light are adjusted accordingly.
Referring to FIG. 7, FIG. 7 shows the light device in FIG. 2 used as a backlight source of a side-type backlight module is shown. The backlight source of a side-type backlight module is disposed at two lateral sides of the light-guiding plate. As indicated in FIG. 7, the light device 20L and the light device 20R are respectively disposed at two lateral sides of the light-guiding plate 70. The holding structure 200I of the light device 20L has a light-mixing area Ml, and the structural design of the holding structure is multi-angled, such that the red light bar 220I, the green light bar 240I, and the blue light bar 260I obliquely face each other in pair. When the red light bar 220I, the green light bar 240I, and the blue light bar 260I respectively emit a red light, a green light, and a blue light at the same time, the red light, the green light, and the blue light are respectively emitted into the light-mixing area Ml to form a white light. Likewise, the holding structure 200r of the light device 20R has a light-mixing area Mr, and the structural design of the holding structure is multi-angled, such that the red light bar 220r, the green light bar 240r, and the blue light bar 260r obliquely face each other in pair. When the red light bar 220r, the green light bar 240r, and the blue light bar 260r respectively emit a red light, a green light, and a blue light at the same time, the red light, the green light, and the blue light are respectively emitted into the light-mixing area Mr to form a white light. Thus, the white light generated by the light device 20L and the white light generated by the light device 20R are respectively emitted into the light-guiding plate 70 from two lateral sides of the light-guiding plate 70, spread evenly and emitted out from the surface of the light-guiding plate 70.
The light device of the first embodiment forms a white light bar extended along a first direction D1. The light device of the second embodiment and the light device of the third embodiment are composed of several white light bars, and the white planar light source formed thereby can be used as a backlight source of the direct-type backlight module. Besides, the number and arrangement of the white light bars are determined according to the size of the panel.
Referring to both FIG. 5A and FIG. 5B, the light device of the second embodiment includes a number of white light bars 20a, 20b, 20c, 20d, 20e and 20f extended along the first direction D1. The white light bars 20a-f are arranged in parallel along a second direction D2 perpendicular to the first direction D1 and are mixed to compose the light device of the second embodiment to form a white planar light source. As indicated in FIG. 5B, several holding structures are arranged in parallel along a second direction to form a wave structure. Referring to FIG. 6, the light device of the third embodiment includes a number of white light bars 60a, 60b, 60c, 60d, 60e, 60f, 60g, 60h, 60i, 60j, 60k, 60l, 60m, 60n, 60o, and 60p extended along the first direction D1. The white light bars 60a-p are arranged in parallel along the first direction D1 and aligned in a second direction D2 perpendicular to the first direction D1 to compose the light device of the third embodiment so as to form another white planar light source. As indicated in FIG. 6, several holding structures are arranged in parallel along the first direction and the second direction to form a beehive structure.
According to the light device disclosed in the above embodiments of the invention, the holding structure has a multi-angled or curved design, such that the red light, the green light, and the blue light bar are disposed in parallel and obliquely face each other in pair to form a white light bar, thereby enabling the LED light source to achieve the color mixing effect. Furthermore, the invention replaces the conventional design of packaging three LED chips together by a structural design, not only significantly improving heat dissipation, but also saving power consumption due to the absence of light-mixing distance. According to the structural design of the invention, the currents of the three LEDs are separately controlled. Thus, respective currents are provided according to the needs of the red light LED, the green light LED, and the blue light LED. Moreover, by controlling the respective currents provided to the red light LED, the green light LED and the blue light LED, backlight sources with different luminance levels or different colors can be provided, hence increasing the luminance efficiency and color saturation of LED light sources.
While the invention has been described by way of example and in terms of a preferred embodiment, it is to be understood that the invention is not limited thereto. On the contrary, it is intended to cover various modifications and similar arrangements and procedures, and the scope of the appended claims therefore should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements and procedures.
Patent Application
20080084691
