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Surface light source

By designing the prism part and reflective side structure in the surface light source, the light mixing distance and light mixing effect of the beam are increased, the light spot problem in the narrow frame design is solved, and the uniformity of light output and cost reduction are achieved.

Inactive Publication Date: 2014-12-24
CORETRONIC CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This light spot can be solved by reducing the pitch P, but when the pitch P is reduced, the manufacturer must use a larger number of LED elements 124, resulting in an increase in cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0036] image 3 It is a schematic cross-sectional view of the surface light source according to the first embodiment of the present invention. Please refer to image 3 , the surface light source 200 of this embodiment includes a light guide plate 210 and a light source device 220 . The light guide plate 210 has a plate body 212 and a plurality of prism portions 214, wherein the plate body 212 has a light incident side 212a, a reflective side 212b opposite to the light incident side 212a, a bottom surface 212c, and a light exit surface 212d opposite to the bottom surface 212c, and The light-incident side 212a and the reflective side 212b are respectively connected to the bottom surface 212c and the light-out surface 212d. The prism portions 214 are substantially adjacent to the bottom surface 212c of the plate-shaped body 212, and each prism portion 214 has a first plane 214a and a second plane 214b adjacent to each other, and the included angle θ between the first plane 214a...

no. 2 example

[0080] Figure 6 It is a schematic cross-sectional view of the surface light source according to the second embodiment of the present invention. Please refer to Figure 6 , the surface light source 300 of this embodiment is similar to the surface light source 200 of the first embodiment, but the main difference between the two is: the reflective side 312b of this embodiment adopts the same Figure 5 In a similar design, the light guide plate 210' of this embodiment has a single prism portion 314, the prism portion 314 has a first plane 314a and a second plane 314b, and the distance d between the second plane 314b and the reflective side 312b is 0.

no. 3 example

[0082] Figure 7 It is a schematic cross-sectional view of the surface light source according to the third embodiment of the present invention. Please refer to Figure 7 , the surface light source 400 of this embodiment is similar to the surface light source 300 of the second embodiment, but the main difference between the two is that: the light guide plate 210 ″ of this embodiment has a single prism part 414, and the prism part 414 has a first The plane 414a and the second plane 414b, and the distance d between the second plane 414b and the reflective side 412b is not zero. For example, the length of the aforementioned distance d is smaller than the length of the bottom surface 212 c of the prism portion 414 in the direction Dy.

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Abstract

The invention discloses a surface light source which comprises a light guide plate and a light source device. The light guide plate comprises a platy body and at least one prism, the platy body is provided with an incident side surface, a reflecting side surface, a bottom surface and an emergent surface, the reflecting side surface is opposite to the incident side surface, the emergent surface is opposite to the bottom surface, the incident side surface and the reflecting side surface are respectively connected with the bottom surface and the emergent surface, and the height of the incident side surface, the height of the reflecting side surface and the thickness of the platy body are approximately identical to one another. The prisms are configured on the bottom surface of the platy body and are provided with first planes and second planes, the first planes and the second planes are abutted to one another, an included angle between each first plane and the bottom surface of the platy body is smaller than an included angle between each second plane and the bottom surface of the platy body, and the shortest distance from the first planes to the incident side surface is shorter than the shortest distance from the second planes to the incident side surface. The light source device is adjacent to the incident side surface. The surface light source has the advantage of excellent emergent light uniformity.

Description

technical field [0001] The present invention relates to a light source, and in particular to a plane light source. Background technique [0002] Since the liquid crystal display is a non-self-illuminating display, it needs the backlight module to provide the required light to realize the display function. With the improvement of environmental awareness, the light-emitting elements used in the backlight module have been gradually converted from cold cathode fluorescent lamps (CCFL) to more environmentally friendly light-emitting diode elements. When the LED element is applied in the backlight module, taking the side-illuminated backlight module as an example, the LED element is usually arranged on a strip-shaped printed circuit board to form an LED light bar (LED light bar), and emits light. The LED light bar is usually electrically connected to the control circuit board through a flexible printed circuit (FPC). [0003] figure 1 is a schematic top view of an existing surf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21S2/00F21V8/00F21Y101/02
CPCG02B6/0055G02B6/0036G02B6/0038G02B6/0045
Inventor 吴中豪刘劲谷
Owner CORETRONIC CORPORATION
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