JP2004349060A - Light emitting diode array light source, and backlight module using the light source - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To apply a light emitting diode array light source to a backlight module and enable it to be started at a low temperature and prevented from being overheated after lighting. <P>SOLUTION: The light emitting diode array light source is composed of at least a loading unit and several light emitting diodes. Of them, the loading unit is provided with a front face and a rear face, on which several pairs of contacts are provided. The light emitting diodes are arranged on the loading unit coupled with each pair of contacts respectively, and the light source provided by the light emitting diodes is irradiated from one side of the loading unit. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a kind of light source and a backlight module (abbreviated as B / L) using this kind of light source, and more particularly to a kind of light emitting diode (abbreviated as LED) / array. The present invention relates to a light source and a backlight module using such a light source.
[0002]
[Prior art]
With the development of high technology, visual products, especially digitized images or video devices, have become products that are already common in everyday life. In these digital image / video devices, the display is an important part of displaying relevant information. The user can read information from the display or control the operation of the device. In addition, the volume of image / video devices is becoming smaller, thinner and lighter every day according to the modern lifestyle. On the other hand, a traditional cathode ray tube display (CRT display) has some merits, but it takes up space and consumes large power. Therefore, a panel-type display that combines photoelectric technology and semiconductor manufacturing technology has evolved into a display product such as a liquid crystal display that is often seen today.
[0003]
A liquid crystal display belongs to a non-self-luminous display, and therefore cannot provide a display purpose unless a sufficient light source is provided. In addition, the liquid crystal display is classified into a transmissive LCD (transmissive LCD), a reflective LCD (reflective LCD), and a transflective liquid crystal display (trans-reflective LCD) according to a use form of the light source. Taking a transmissive LCD or a transflective LCD as an example, they usually use a backlight module as their main light source, and the backlight module usually includes a cold cathode fluorescent lamp (CCFL) as a light emitting source. , A light guide panel (abbreviated as LGP), a reflector, and a lamp holder, and the arrangement is as shown in FIG.
[0004]
FIG. 1 is a cross-sectional view of a widely known notebook PC backlight module. Please refer to FIG. The widely known backlight module 100 mainly includes components such as a cold cathode fluorescent lamp 102 as a light emitting source, a light guide plate 104, and a lamp holder 106, among which the light guide plate 104 includes a light incident surface 103a, It has a light exit surface 103b and a light scattering surface 103c. The lamp holder 106 is disposed at a position corresponding to the light incident surface 103a of the light guide plate 104, and the lamp tube 102 is disposed in the lamp holder 106. Light emitted from the lamp tube is concentrated on the light guide plate by the lamp holder. Incident.
[0005]
[Patent Document]
JP-A-2002-321397
Problems and Object to be Solved by the Invention
However, since it is limited by the tube diameter of the cold cathode fluorescent lamp 102, it is difficult to reduce the thickness of the entire backlight module. Further, after the cold cathode fluorescent lamp 102 is used for a long time, since the temperature always rises, the portion of the light guide plate 104 close to the cold cathode fluorescent lamp 102 is yellowed, causing color unevenness. The light guide plate 104 is bent. Further, the widely known cold cathode fluorescent lamp 102 is difficult to start at a low temperature, and the intended brightness cannot be obtained unless preheating (warm up) is always performed at the beginning of lighting.
[0007]
Accordingly, an object of the present invention is to provide a kind of light emitting diode array light source and a backlight module using this kind of light source in order to avoid yellowing and deformation of the light guide plate due to high temperature.
[0008]
It is another object of the present invention to provide a kind of light emitting diode array light source and a backlight module using this kind of light source to reduce the thickness of the whole backlight module.
[0009]
Another object of the present invention is to provide a kind of light emitting diode array light source and a backlight module using this kind of light source so that it can be started at low temperature and does not require preheating. is there.
[0010]
It is another object of the present invention to provide a kind of light emitting diode array light source and a backlight module using such a light source to increase the brightness.
[0011]
Based on these and other objects, the present invention comprises a loader having several sets of contacts on the front and back, and several light emitting diodes disposed on the loader, each light emitting diode having a respective set of contacts. A kind of light emitting diode array light source is provided, wherein the light source provided by the light emitting diode is emitted from one side of the loader in electrical connection.
[0012]
[Means for Solving the Problems]
The present invention comprises a two-fold flexible printed circuit (abbreviated as FPC) thin film and several light emitting diodes, and the two-fold flexible printed circuit thin film has a first bonding area, a second bonding area, And having a bent area connecting the first joint area and the second joint area, that there are several sets of first contacts on the first joint area, and that there are several sets of second contacts on the second joint area. A kind of light emitting diode array light source is provided. In addition, the light emitting diodes are disposed in the first junction area and the second junction area, and each light emitting diode is electrically connected to the first contact of each set and the second contact of each set, and the light source provided by the light emitting diode Are ejected from one side of the two-fold flexible printed circuit film.
[0013]
The present invention also provides a type of backlight module, comprising a light guide plate having a light incident surface, a light exit surface, and a light diffusion surface, and a light emitting diode array light source. The light emitting diode array light source is arranged on the light incident side of the light guide plate, and includes a loader having several sets of contacts on the front and rear sides and several light emitting diodes. The light emitting diodes are disposed on the loader, each light emitting diode is electrically connected to each of the set contacts, and a light source provided by the light emitting diode is emitted from one side of the loader.
[0014]
Further, the present invention comprises a light guide plate having a light incident surface, a light exit surface, and a light scattering surface, and a light emitting diode array light source, and the light emitting diode array light source is disposed on the light incident side of the light guide plate. Folded flexible printed circuit includes a thin film and several light emitting diodes, the two-folded flexible printed circuit has a first bonding area, a second bonding, and a bending area connecting the first bonding area and the second bonding area. A backlight module is also provided, characterized in that there are several first contacts on the first joining area and several second contacts on the second joining area. Further, the light emitting diode is disposed in the first junction area and the second junction area, each light emitting diode is electrically connected to each group first contact and each group second contact, the light source provided by the light emitting diode, Injected from one side of a two-fold flexible printed circuit film.
[0015]
The present invention uses a loader and several light emitting diodes as light sources to increase brightness and avoid the widely known problem of high temperatures caused by long operating lamp tubes. Can be. Further, the thickness of the backlight module is not limited by the tube diameter of the cold cathode fluorescent lamp, which is widely known. Furthermore, the light source of the present invention can be started at a low temperature, and the preheating time can be reduced.
[0016]
In order to more clearly show the above and other objects, features and advantages of the present invention, preferred embodiments will be described below in detail with reference to the drawings.
[0017]
【Example】
The main concept of the present invention is to form the light source of the backlight module of the liquid crystal display with a loader and several light emitting diodes, and the backlight module formed by this concept has at least three forms. . Hereinafter, description will be made with reference to FIGS. 2, 3-1, 3-2, 4-1 and 4-2.
[0018]
(Example 1)
FIG. 2 is a cross-sectional view of a backlight module (abbreviated as B / L) according to the first embodiment of the present invention.
[0019]
Please refer to FIG. The backlight module 200 of the present invention includes a light emitting diode (abbreviated as LED) / array light source 202, and a light guide plate (light guide panel, LGP) having a light incident surface 203a, a light exit surface 203b, and a light scattering surface 203c. 204). The light emitting diode array light source 202 is disposed on the light incident surface 203 a side of the light guide plate 204. The light emitting diode array light source 202 includes a loader 206 and several light emitting diodes 208. The loader 206 has a front surface 207a and a back surface 207b, and has several sets of contacts on the front surface 207a and the back surface 207b. 210. The loader 206 is, for example, a printed circuit board, and the light emitting diode 208 is, for example, a surface-adhesive light emitting diode element.
[0020]
Still referring to FIG. Regarding the positional relationship between the light emitting diode 208 and the loader 206, the light emitting diode 208 is disposed on the loader 206, and each diode 208 is electrically connected to each of the set contacts 210. The emitted light is emitted from one side of the loader 206. When the light emitting diodes 208 are surface-adhesive light emitting diode elements, each light emitting diode 208 has a pair of electrodes (not shown) and is electrically connected to the contact 210 through each electrode. At this time, the light emitting diodes 208 are arranged to be symmetrical to each other or to cross each other. Further, the light guide plate 204 has a reflection plate 205 on the light scattering surface 203c, and a slight optical film such as a diffusion film and a light-enhancing film can be arranged on the light exit surface 203b.
[0021]
(Example 2)
FIG. 3-1 is a cross-sectional view of a backlight module according to Embodiment 2 of the present invention.
[0022]
Please refer to FIG. The backlight module 300 of the present embodiment includes a light emitting diode array light source 302 and a light guide plate 304 having a light incident surface 303a, a light exit surface 303b, and a light scattering surface 303c. 304 is disposed on the side of the light incident surface 303a. The light emitting diode array light source 302 is composed of a two-fold flexible printed circuit thin film (abbreviated as FPC) 306 and several light-emitting diodes 308. A first joint area 307a having a first contact 310a, a second joint area 307b having several pairs of second contacts 310b, and a bent area 307c connecting the first joint area 307a and the second joint area 307b, The flexible printed circuit thin film 306 is a single-layer flexible printed circuit thin film or a multilayer flexible printed circuit thin film, and the light emitting diode 308 is, for example, a surface-adhesive light emitting diode element.
[0023]
Please refer to FIG. The light emitting diode 308 is arranged outside the first joint area 307a and the second joint area 307b. Each light emitting diode 308 is electrically connected to each set first contact 310a and each set second contact 310b. The light provided by the light emitting diode is emitted from one side of the two-folded flexible printed circuit thin film 306. Further, when the light-emitting diodes 308 are surface-adhesive light-emitting diode elements, each light-emitting diode 308 has a pair of electrodes (not shown), and a first contact 310a and a second contact 310b through each electrode. The light emitting diode 308 electrically connected to the first contact 310a and the light emitting diode 308 electrically connected to the second contact 310b are arranged symmetrically with each other or intersecting each other. You. In addition, a reflection plate 305 is provided on the light scattering surface 303c of the light guide plate 304, and an optical film such as a diffusion film or a brightening film can be disposed on the light exit surface 303b of the light guide plate 304.
[0024]
Further, please refer to FIG. 3B to describe the light emitting diode array light source 302 of this embodiment.
[0025]
FIG. 3B is a diagram of the light emitting diode array light source of the backlight module of FIG. Here, please refer to FIG. The flexible printed circuit thin film 306 in the light emitting diode array light source 302 has a first bonding area 307a, a second bonding area 307b, and a bent area 307c connecting the first bonding area 307a and the second bonding area 307b; The light emitting diode 308 is disposed on the flexible printed circuit thin film 306. Thereafter, the flexible printed circuit thin film 306 in the figure is folded in two from the bending line 320, and is put into the backlight module 300 in FIG.
[0026]
(Example 3)
FIG. 4-1 is a cross-sectional view of a backlight module according to Embodiment 3 of the present invention.
[0027]
Please refer to FIG. The biggest difference between the backlight module 400 of the present embodiment and the backlight module 300 of FIG. 3A is in the form of the light emitting diode array light source 402. The light emitting diode array light source 402 of the present embodiment includes a two-folded flexible printed circuit thin film 406 and several light-emitting diodes 408. The two-folded flexible printed circuit thin film 406 includes a first bonding area 407a, It has two joint areas 407b, a bent area 407c connecting the first joint area 407a and the second joint area 407b, and has several sets of first contacts 410a on the first joint area 407a, and a second joint area 407b. There are several sets of second contacts 410b on top. Refer to FIG. 4-2 for describing the light emitting diode array light source 402 of the present embodiment.
[0028]
FIG. 4-2 is a development view of the light emitting diode array light source of the backlight module of FIG. 4-1 when viewed from above. Here, please refer to FIG. The flexible printed circuit thin film 406 in the light emitting diode array light source 402 is folded in two from the bend line 420 and is inserted into the backlight module 400 in FIG.
[0029]
【The invention's effect】
Therefore, a feature of the present invention resides in that the loader and several light emitting diodes are used as the light source of the backlight module, thereby increasing the brightness. Further, since the present invention uses a light emitting diode as a light source, it is possible to avoid a widely known problem that a high temperature is generated by lighting a lamp tube for a long time. Further, the thickness of the backlight module of the present invention is not limited by the tube diameter of the cathode fluorescent lamp, which is widely known. Furthermore, by using the light source of the present invention, the light source can be started at a low temperature, and the preheating time can be reduced.
[0030]
Although the invention has been described above in terms of relatively preferred embodiments, it is not to be construed as limiting the invention. Those skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the technical scope covered by the present invention is based on the claims.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a widely known notebook PC backlight module.
FIG. 2 is a sectional view of a backlight module according to Embodiment 1 of the present invention.
FIG. 3-1 is a cross-sectional view of a backlight module according to Embodiment 2 of the present invention.
FIG. 3B is a development view of the light emitting diode / array light source of the backlight module of FIG.
FIG. 4-1 is a cross-sectional view of a backlight module according to Embodiment 3 of the present invention.
FIG. 4-2 is a development view of the light emitting diode array light source of the backlight module of FIG. 4-1 when viewed from above.
[Explanation of symbols]
100, 200, 300, 400: backlight module 102: cold cathode fluorescent lamps 103a, 203b, 303a: light incident surfaces 103b, 203b, 303b: light emitting surfaces 103c, 203c, 303c: light scattering surfaces 104, 204, 304: Light guide plate 106: lamp holder 200: backlight modules 202, 302, 402: light emitting diode array light source 203a: light incident surface 203b: light exit surface 203c: light scattering surface 204: light guide plate 205: reflective plate 206: stacker 207a : Front 207b: Back 208: Light emitting diode 210: Contact 208, 308, 408: Light emitting diode 210, 310a, 310b: Contact 305: Reflector 306, 406: Flexible printed circuit thin film 307a, 307c, 407a, 407b: Joint area 307 , 407c: bent area 320 and 420: crooked line

Claims (10)

A loader having a plurality of sets of contacts on each of the front and back sides, and a plurality of light emitting diodes arranged on the loader, wherein the light emitting diodes are respectively electrically connected to the plurality of sets of contacts, and A kind of light emitting diode array light source, wherein light provided by the light emitting diode is emitted from one side of the loader. Applied to a backlight module, the backlight module includes a light incident surface, a light exit surface, a light guide plate having a light scattering surface,
A loader having a plurality of sets of contacts on each of the front and back sides, and a plurality of light emitting diodes disposed on the loader, wherein the plurality of light emitting diodes are electrically connected to the plurality of sets of contacts, respectively. And a light source provided by the plurality of light emitting diodes is emitted from one side of a loader. 3. The light emitting diode array light source according to claim 1, wherein the loading device is selected from a printed circuit board, a single-layer flexible printed circuit thin film, and a multilayer flexible printed circuit thin film. The plurality of light-emitting diodes are all surface-adhesive light-emitting diode elements, the plurality of light-emitting diodes each have a set of electrodes, and the plurality of light-emitting diodes are each connected through the electrode. The light emitting diode array light source according to claim 1, wherein the light emitting diode array light source is electrically connected to the light emitting diode array light source. The arrangement method of the plurality of light emitting diodes is selected from an arrangement method that is symmetrical to each other, an arrangement method that intersects with each other, and an arrangement method that is partially symmetrical and partially intersects with each other. A light emitting diode array light source according to claim 2. A first joining area, a second joining area, and a bent area joining the first joining area and the second joining area; a plurality of first contacts on the first joining area; Having a plurality of sets of second contacts on the area, a two-fold flexible printed circuit thin film, and the plurality of sets of first contacts and the plurality of sets of second contacts arranged in the first bonding area and the second bonding area. A kind of light emitting diode array light source, comprising a plurality of light emitting diodes electrically connected to a contact and emitting light to be provided from one side of the two-folded flexible printed circuit thin film. . A two-fold flexible printed circuit thin film having a first joining area having a plurality of sets of first contacts, a second joining area having a plurality of sets of second contacts, and a bend area connecting the first joining area and the second joining area. The first contact of the plurality of sets and the second contact of the plurality of sets are electrically connected, and the light to be provided is emitted from one side of the two-fold flexible printed circuit thin film, The present invention is applied to a backlight module comprising a light guide plate having a light incident surface, a light exit surface, and a light scattering surface, comprising a plurality of light emitting diodes arranged in a junction area and the second junction area. A kind of light emitting diode array light source. The plurality of light-emitting diodes are all surface-adhesive light-emitting diode elements, each having one set of electrodes, and the plurality of first contacts and the plurality of second contacts through the plurality of sets of electrodes, respectively. The light emitting diode array light source according to claim 6, wherein the light emitting diode array light source is electrically connected to a contact. The plurality of light emitting diodes electrically connected to the plurality of first contacts and the plurality of light emitting diodes electrically connected to the plurality of sets of second contacts are arranged symmetrically to each other. The light emitting diode array light source according to claim 6, wherein the light emitting diode array light source is selected from a system, an intersecting arrangement, and an arrangement partially symmetric and partially intersecting with each other. The backlight module according to claim 2, further comprising a reflector disposed on the light scattering surface.

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