CN100370327C

CN100370327C - Backlight module

Info

Publication number: CN100370327C
Application number: CNB2003101124446A
Authority: CN
Inventors: 张仁淙
Original assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Current assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Priority date: 2003-11-29
Filing date: 2003-11-29
Publication date: 2008-02-20
Anticipated expiration: 2023-11-29
Also published as: CN1621907A

Abstract

The present invention discloses a back light module which comprises a light guide plate, at least one light source, a color filter with a plurality of color regions, and a driving gear used for moving the color filter, wherein the light guide plate comprises at least one light incident surface, a light emergent surface and a bottom surface, the light source is adjacent to the light incident surface of the light guide plate, and the color filter can be movably arranged between the light source and the light incident surface of the light guide plate. Light beams emitted by the light source are projected in one of the color regions of the color filter, and enter the light guide plate passing through the light incident surface.

Description

Module backlight

[technical field]

The invention relates to a kind of module backlight of module backlight, particularly a kind of convertible color.

[background technology]

Because the liquid crystal of panel of LCD itself does not have the characteristics of luminescence, thereby, for reaching display effect, need to give the LCD panel that one light-source system is provided, as module backlight, its function is to provide the area source that brightness is abundant and be evenly distributed to panel.

The module backlight of prior art mainly is made up of light source and light guide plate, and the effect of this light guide plate is the transmission direction of direct light source emitted light, changes it into brightness and the higher area source outgoing of homogeneity.This light source can be pointolite such as light emitting diode, also can be line source such as cold cathode fluorescent lamp.

For satisfying the demand that multicolour shows, cooperate the module backlight of light guide plate need use a plurality of pointolites with pointolite with different color, select needed colored the demonstration by lighting different pointolites, still, adopt a plurality of pointolites that the cost of module backlight is increased.

The module backlight that cooperates light guide plate with line source as depicted in figs. 1 and 2, it is exposed in No. the 542360th, the TaiWan, China patent of bulletin on July 11st, 2003.This module 20 backlight is arranged on the bottom of liquid crystal module 10 and forms LCD 1, and this module 20 backlight comprises light-guide device 21, a reflection horizon 22, a photochromic layer 26, a brightness enhancement layer 25 and a light source 23 made from transmitting substrate.This light-guide device 21 is wedge shape light guide plate, its top has an exiting surface (not indicating), the bottom has a light guiding surface 212, reflection horizon 22 is arranged on the bottom of this light guiding surface 212, light source 23 is arranged on incidence surface 215 1 sides of this light-guide device 21, and this light source 23 is at the catoptron 24 that is provided with an arc away from incidence surface 215 1 sides of light-guide device 21.This light-guide device 21 has been wholely set photochromic layer 26 and brightness enhancement layer 25 on exiting surface, this brightness enhancement layer 25 is made up of a plurality of optical particles 251, and the outside surface of these a plurality of optical particles 251 has a plurality of protuberances respectively, the colorant that these photochromic layer 26 blending are predetermined.

This module 20 backlight can change the white light X that light source 23 is sent into colorama Y by photochromic layer 26, this colorama Y is through transferring the light W outgoing of higher brightness to after the brightness enhancement layer 25, but, because this photochromic layer 26 and brightness enhancement layer 25 all are to be wholely set on light-guide device 21, this kind colour promptly can not be changed once setting again, and is difficult to realize different colored changes.

[summary of the invention]

For the module backlight that overcomes prior art is difficult to realize the problem that different color changes, the invention provides a kind of module backlight of convertible color.

The technical scheme that technical solution problem of the present invention is adopted is: a kind of module backlight is provided, and it comprises that a light guide plate, at least one light source, have the colored filter and in multicolour zone in order to move the drive unit of this colored filter.This light guide plate comprises at least one incidence surface, one exiting surface and a bottom surface, the incidence surface setting of contiguous this light guide plate of this at least one light source, this colored filter is arranged between this light source and the light guide plate incidence surface movably, the light beam that this light source sent is incident upon one of this colored filter multicolour zone after incidence surface enters light guide plate, this drive unit is in order to move this colored filter, this drive unit further comprises two stators, be enclosed within two rotating disks and a CD-ROM drive motor on this stator respectively, this colored filter is wound on the rotating disk and can moves with the rotation of rotating disk, and this CD-ROM drive motor can drive one of this rotating disk.

Compared to prior art,, can be converted to various coloramas and enter light guide plate having the light that sends in simple color glory source, thereby can form the module backlight of different color because module backlight of the present invention comprises that one has the colored filter in multicolour zone; Because the present invention only adopts the single color light source, also can reduce cost again.

[description of drawings]

Fig. 1 is the perspective view that prior art has the LCD of optically allochroic light-conducting element.

Fig. 2 is the light path synoptic diagram of LCD shown in Figure 1.

Fig. 3 is the three-dimensional exploded view of the present invention's module backlight.

Fig. 4 is the three-dimensional assembly diagram of the present invention's module backlight.

Fig. 5 is the light path synoptic diagram of the present invention's module backlight.

[embodiment]

Module backlight of the present invention as shown in Figure 3 and Figure 4, this module 5 backlight comprises a light source 51, a light guide plate 52, a framework 53, a colored filter 54 and a drive unit (indicate).This light source 51 is pointolite such as light emitting diode, and it is in order to send white light beam, and the transmission direction that these light guide plate 52 these light sources 51 of guiding send light beam is converted into the area source outgoing.

This light guide plate 52 is plate shaped, adopts transparent materials such as acryl, glass or polycarbonate to make, and it comprises exiting surface 522 and exiting surface 522 opposed bottom surface 523 and a plurality of side 524 that an incidence surface 521 links to each other with incidence surface 521.This incidence surface 521 is in order to receive the light beam that light source 51 sends.This exiting surface 522 can be processed as the uneven surface with certain roughness.The bottom surface 523 of light guide plate 52 is provided with a plurality of light scattering site (figure does not show), to improve the brightness and the homogeneity of light guide plate 52 outgoing beams.The size of this site is to increase progressively along the direction away from incidence surface 521, and it is a spherical shape.This site also can be cylindric, square, pyramid or other suitable shape.This site can be printed or mode such as ejection formation is distributed in the bottom surface 523 of light guide plate 52.In addition, also can be 523 a plurality of V-shaped grooves be set to substitute these a plurality of sites in the bottom surface.

This framework 53 comprises a base plate 531 and three frames 532 that are projected on this base plate 531, these three frames 532 surround a space of accommodating this light guide plate 52 (indicating), this light source 51 is arranged on this base plate 531, this base plate 531 and bottom surface of light guide plate 523 corresponding surfaces are reflecting surface, and these three

frames

532 and 524 corresponding surfaces, light guide plate side also are reflecting surface.

This colored filter 54 comprises multicolour zone 541,542 and 543 etc., this each color area 541,542 and 543 is a square pattern, its corresponding respectively location coding pattern 58, this colored filter 54 is arranged between this light source 51 and light guide plate 52 incidence surfaces 521 movably, and the light beam that this light source 51 is sent is incident upon one of these colored filter 54 multicolour zones 541,542 or 543 after incidence surface 521 enters light guide plate 52.

This drive unit is arranged on this base plate 531, it comprises two stators 55 between light source 51 and light guide plate 52 incidence surfaces 521 (figure only shows one), is enclosed within two rotating disks 56 and a CD-ROM drive motor 57 on this stator 55 respectively, this colored filter 54 is wound on the rotating disk 56 and can moves with the rotation of rotating disk 56, thereby this colored filter 54 is arranged on the base plate 531 of this framework 53 movably.One of these two rotating disks 56 can drive by CD-ROM drive motor 57.

Consult Fig. 5 together, select and conversion for accurately carrying out color, can carry out interpretation to location coding pattern 58 by a location device (figure does not show), the signal that institute's interpretation goes out feeds back to drive unit again, this drive unit drives colored filter 54, makes one of color area 541,542,543 that meets required color (being illustrated as color area 542) between light source 51 and incidence surface 521.The light 511 that this light source 51 is sent will all be incident upon on this color area 542, enter light guide plate 52 with specific colour through incidence surface 521 through after these color area 542 colour filters.Certainly, the light 511 that this light source 51 is sent also can be incident upon the two or more of this multicolour zone 541,542,543 simultaneously, to realize more color change.

Because module backlight of the present invention comprises that one has the colored filter 54 in multicolour zone 541,542,543, it can be converted to the light in simple color glory source 51 various coloramas and enter light guide plate 52, thereby can make module 5 backlight form different colors; Because the present invention only adopts single white light source, therefore can reduce cost again.

Module backlight of the present invention can have following other change design, for example:

This light source 51 can be line source such as cold cathode fluorescent lamp;

Can be by method plating one deck anti-reflection films such as electron beam evaporation plating or chemical vapour deposition techniques on these light guide plate 52 incidence surfaces 521, this exiting surface 522 can be atomization surface or the scattering netted dot that a plurality of regular distribution are set;

The shape of this light guide plate 52 also can be a wedge shape;

Each color area 541,542,543 shape of this colored filter 54 also can be circular or oval-shaped grating filter;

These light guide plate 52 exiting surfaces 522 1 sides can further be provided with a prismatic lens, a diffuser plate and a prismatic lens in regular turn.

Claims

1. module backlight, it comprises an at least one light source and a light guide plate, this light guide plate comprises at least one incidence surface, one exiting surface and a bottom surface, this incidence surface is corresponding with this light source, it is characterized in that: this module backlight comprises that further a drive unit and has the colored filter in multicolour zone, this colored filter is arranged between this light source and the light guide plate incidence surface, the light beam that this light source sent is incident upon one of this colored filter multicolour zone after incidence surface enters light guide plate, this drive unit is in order to move this colored filter, this drive unit further comprises two stators, be enclosed within two rotating disks and a CD-ROM drive motor on this stator respectively, this colored filter is wound on the rotating disk and can moves with the rotation of rotating disk, and this CD-ROM drive motor can drive one of this rotating disk.

2. module backlight according to claim 1 is characterized in that: this light source is light emitting diode or cold cathode fluorescent lamp.

3. module backlight according to claim 1, it is characterized in that: this module backlight further comprises a framework, this framework comprises a base plate and three frames that are projected on this base plate, these three frames surround a space of accommodating this light guide plate, this light source is arranged on this base plate, and this colored filter is arranged on this base plate movably.

4. module backlight according to claim 1 is characterized in that: this exiting surface is atomization surface or the scattering netted dot that is provided with a plurality of regular distribution.

5. module backlight according to claim 1 is characterized in that: this module backlight further comprises a prismatic lens, a diffuser plate and a prismatic lens that is positioned at light guide plate exiting surface one side and is provided with in regular turn.

6. module backlight according to claim 3 is characterized in that: the corresponding surface of this base plate and bottom surface of light guide plate is a reflecting surface, and the corresponding surface of this frame and light guide plate side is a reflecting surface.

7. module backlight according to claim 1 is characterized in that: the multicolour zone of this colored filter is grating filter.

8. module backlight according to claim 1 is characterized in that: each color region shape of this colored filter is square, circular or oval.

9. module backlight according to claim 1, it is characterized in that: this module backlight further comprises a location device, each color area of this colored filter comprises a location coding pattern respectively, but the location coding pattern of this each color area of locating device interpretation, and the signal that institute's interpretation is gone out feeds back to drive unit.