CN201407557Y

CN201407557Y - Backlight module with the function of finely tuning chrominance

Info

Publication number: CN201407557Y
Application number: CN200920072291XU
Authority: CN
Inventors: 蔡宗霖
Original assignee: SUZHOU XIANGLONG PLASTIC CO Ltd
Current assignee: SUZHOU XIANGLONG PLASTIC CO Ltd
Priority date: 2009-05-15
Filing date: 2009-05-15
Publication date: 2010-02-17
Anticipated expiration: 2019-05-15

Abstract

The utility model relates to a backlight module with the function of finely tuning chrominance, which comprises a first light conducting plate provided with a first surface and a second surface whichare opposite, a second light conducting plate which is provided with a first surface and a second surface, which are opposite, wherein the first surface of the second light conducting plate is mutually contacted with the second surface of the first light conducting plate, the second surface of the second light conducting plate is provided with a reflector plate. The backlight module further comprises a plurality of first chrominance white-light LEDs and a plurality of second chrominance white-light LEDs, wherein the plurality of first chrominance white-light LEDs are arranged on the side edgeof the first light conducting plate, and the first chrominance white-light LEDs are together connected with an independent first return circuit; the plurality of second chrominance white-light LEDs are arranged on the side edge of the second light conducting plate, and the second chrominance white-light LEDs are together connected with another independent second return circuit. The backlight module has the beneficial effects that the chrominance or the color-temperature can be finely tuned, and the cost is low.

Description

Backlight module with fine-tuning chromaticity function

Technical field

The utility model relates to a kind ofly can be applied to be the backlight module of light-emitting device, to relate in particular to the light-source structure of this backlight module such as make displays such as LCD TV, computer, mobile phones.

Background technology

For some electronic products, whether its operation-interface can be luminous except relating to illuminating effect, also is related to the surcharge of aspects such as visual appearance, texture.Described operation-interface with illumination effect, usually include a backlight module, the structure of this backlight module mainly includes a LGP and at least one light source, LGP comprises an exiting surface and at least one incidence surface, with the exiting surface opposed bottom surface usually as incidence surface, maybe can be with the side of LGP as incidence surface, and light source is set in this incidence surface; The front of the LGP blooming pieces such as brightening piece, diffusion sheet that can be sticked in regular turn by actual needs.As shown in Figure 1, the existing side-light type LGP that generally is used, promptly at least one side at LGP A is provided with light source D, and the bottom surface of LGP A is provided with reflector plate B usually, be recycled to rearrangement utilization in the LGP with the light reflection that will overflow LGP, and prevent the backlight module light leak, derive by predetermined visual angle or direction through the light of blooming piece C such as brightening piece and diffusion sheet, to present the good brilliant degree and the uniformity.Based on light conduction efficiency and inhomogeneity consideration, for the bigger LGP of length, some can be designed to the inclined-plane with bottom surface of light guide plate, reflector plate B then is affixed on this inclined-plane, light source D then is located at a side of light guide plate maximum, and this inclined-plane is light guide plate to be presented heal far away and the little trend that heals apart from light source, and it is evenly approaching to make light can try one's best when reflector plate reflects LGP, reduces the quantity of light source simultaneously.

Described light source can be light emitting diode (LED, light emitting diode) or cold-cathode tube (CCFL); Because the advantage of little, the little power consumption of volume, long service life, be used in the existing trend that replaces CCFL gradually by LED of light source of backlight module.The light source that is used in backlight module uses white light more, and the method for utilizing LED to produce white light has two kinds:

First kind is to add fluorescer to absorb blue light in blue light diode, and then discharges white light, and its colourity is by the wavelength and the decision of fluorescer composition of blue chip.Its advantage is that driver circuit is simple; Shortcoming then is once selected colourity or colour temperature, promptly can't adjust in actual applications.

Another kind of white light then reaches via suitable mixture of red, coloured light green, blue three-color.Its advantage is the collocation by the red, green, blue drive current, can adjust the light (comprising white light) of full gamut.Shortcoming is the design complexity of driver circuit, and cost is very high.

Summary of the invention

The utility model technical issues that need to address have provided a kind of backlight module with fine-tuning chromaticity function, are intended to solve the above problems.

In order to solve the problems of the technologies described above, the utility model is achieved through the following technical solutions:

The utility model comprises: one first LGP has relative first and second; One second LGP has relative first and second, and first of this second LGP and second face of first LGP are in contact with one another, and second face of this second LGP is provided with reflector plate; Also comprise: the plural first colourity white light LEDs, be located at the side of this first LGP, the described first colourity white light LEDs is common to connect first circuit loop independently; The plural number second colourity white light LEDs is located at the side of this second LGP, and the described second colourity white light LEDs is common to connect another second circuit loop independently.

Compared with prior art, the beneficial effects of the utility model are: can inching colourity or colour temperature, and with low cost.

Description of drawings

Fig. 1 is for showing the schematic diagram of backlight module basic structure in the prior art;

Fig. 2 is the decomposing schematic representation of the basic module syntagmatic of demonstration the utility model backlight module first embodiment;

After the combination of components of Fig. 3 for demonstration the utility model backlight module first embodiment, the conducting path schematic diagram of light;

The schematic top plan view of Fig. 4 after for the combination of components that shows the utility model backlight module first embodiment;

Fig. 5 is provided with the schematic diagram that possesses the color diaphragm for showing the structure of the utility model backlight module first embodiment between the incidence surface of the second colourity white light LEDs and second LGP;

Fig. 6 is the decomposing schematic representation of the basic module syntagmatic of demonstration the utility model backlight module second embodiment.

The specific embodiment

Below in conjunction with the accompanying drawing and the specific embodiment the utility model is described in further detail:

The utility model is with two mutual storehouses of LGP, and the white light LEDs of different colourities is set respectively at least one side of each LGP, the white light LEDs of identical colourity is one group and connects a circuit loop independently respectively, when feeding electric current, the white light LEDs of different colourities produces the different photochromic LGPs that enters separately respectively, the light that penetrates from a LGP can form mixed light when entering in another LGP, again, size by the control magnitude of current, can change brightness, adjust colourity by the change of the brightness ratio of two LGPs again, and this colourity is that (for example between the white light LEDs in described different colourities) fine setting changes in a specific chromaticity range.

A wherein technological means of the present utility model, provide one first LGP and one second LGP that relative two sides are the plane, second of first LGP with second LGP first contacts and storehouse, second of second LGP then is provided with reflector plate, and being respectively provided to few one first colourity white light LEDs and at least one second colourity white light LEDs at least one side of this first and second LGP, its light of injecting first and second LGP respectively is finally by first ejaculation of first LGP.The described first colourity white light LEDs and the second colourity white light LEDs can be located at the same side mutually of this first LGP and second LGP respectively, also can be arranged on an opposite side.

Another technological means of the present utility model, provide first and be first LGP on inclined-plane for plane and second, and first be that inclined-plane and second are second LGP on plane, the gradient on this two inclined-plane is identical, use second of first LGP with second LGP first contacted and during storehouse, make first face of first LGP be parallel to second of second LGP; Second of second LGP then is provided with reflector plate, and being respectively provided to few one first colourity white light LEDs and at least one second colourity white light LEDs in the maximum side of the thickness of this first and second LGP, its light of injecting first and second LGP respectively is finally by first ejaculation of first LGP.

A technological means more of the present utility model, can be between the incidence surface of the described first colourity white light LEDs and first LGP, and/or be provided with a diaphragm that possesses color between the incidence surface of second colourity white light LEDs and second LGP, inject light color in the LGP with change.

Adopt the method for fine-tuning chromaticity of the present utility model, by following steps:

With two mutual storehouses of LGP, and at least one side of each LGP the white light LEDs of different colourities is set respectively, the white light LEDs of identical colourity is one group and connects a circuit loop independently respectively;

When feeding electric current, the white light LEDs of different colourities produces the different photochromic LGPs that enters separately respectively, and the light that penetrates from a LGP can form mixed light when entering in another LGP;

By controlling the size of the magnitude of current respectively, change brightness;

Adjust colourity by the change of the brightness ratio of two LGPs again, and this colourity is that fine setting changes between the white light LEDs of described different colourities.

Consult Fig. 2 to shown in Figure 4, first embodiment of the present utility model, include one first LGP 1A and one second LGP 1B, this first LGP 1A has relative first 1A1 and second 1A2, this first plane that 1A1 is a level, second 1A2 is the inclined-plane, in a side of its maximum ga(u)ge at least one first colourity white light LEDs 4A is set; On first 1A1 the blooming piece of forming such as brightening piece, diffusion sheet etc. 3 is set then.The second LGP 1B also has first 1B1 and second 1B2 that is positioned at relative both sides, and this first 1B1 is the inclined-plane of second 1A2 of the corresponding first LGP 1A, and second 1B2 then is the plane of level; Described second 1A2 is identical with the gradient of first 1B1, and therefore, when second 1A2 contacted with first 1B1, first 1A1 and second 1B2 were parallel to each other; The second LGP 1B is provided with at least one second colourity white light LEDs 4B in a side of its maximum ga(u)ge equally, and at second 1B2 one reflector plate 2 is set.

The common connection one of the described plural first colourity white light LEDs 4A is first circuit loop independently, when feeding electric current, is produced ray cast and enter the first LGP 1A, and by the control magnitude of current, can change its brightness.The described plural second colourity white light LEDs 4B then connects another independently second circuit loop jointly, when feeding electric current, is produced ray cast and enters this second LGP 1B, by the control magnitude of current, also can change its brightness.The part light that the second colourity white light LEDs 4B injects in the second LGP 4B can directly enter in the first LGP 1A, part light then enters the first LGP 1A again by reflector plate 2 reflections, and then and form mixed light by the light that the first colourity white light LEDs is injected the first LGP 1A, control the different of first LGP and the second light guide plate luminance ratio via the change of the control magnitude of current, thereby reach the purpose of adjustment colourity.

Fig. 5 shows another embodiment of the present utility model, one diaphragm 5 with color can be set between the incidence surface of the second colourity white light LEDs 4B and the second LGP 1B, or a diaphragm with color is set between the incidence surface of the first colourity white light LEDs 4A and the first LGP 1A; Or between the incidence surface of first colourity white light LEDs and first LGP, and the diaphragm with color all is set between the incidence surface of second colourity white light LEDs and second LGP, also can change and enter the first LGP 1A or the interior light color of the second LGP 1B.

Shown in Figure 6 is to show another embodiment of the present utility model, be first 1A1 and second 1A2 with the first LGP 1A, and first 1B1 of the second LGP 1B all forms parallel plane with second 1B2, same, first 1A1 at the first LGP 1A is provided with plural blooming piece 3, second 1B2 of the second LGP 1B then is provided with second 1A2 of reflector plate 2, the first LGP 1A and first 1B1 of the second LGP 1B is in contact with one another; At least one side of the first LGP 1A then is provided with the plural first colourity white light LEDs 4A and connects independently circuit loop; At least one side of the second LGP 1B then is provided with the plural second colourity white light LEDs 4B and connects another independently circuit loop, and is luminous by circuit feeding electric current, and changes the brightness of light by changing the magnitude of current, and then does the fine setting of photochromism.

The above only is in order to explain preferred embodiment of the present utility model; be not that the attempt tool is to do any pro forma restriction to the utility model; be with; all have in that identical creation spirit is following do relevant any modification of the present utility model or change, all must be included in the intention protection domain of the present utility model.

Claims

1, a kind of backlight module with fine-tuning chromaticity function comprises: one first LGP has relative first and second; One second LGP has relative first and second, and first of this second LGP and second face of first LGP are in contact with one another, and second face of this second LGP is provided with reflector plate; It is characterized in that also comprising: the plural first colourity white light LEDs, be located at the side of this first LGP, the described first colourity white light LEDs is common to connect first circuit loop independently; The plural number second colourity white light LEDs is located at the side of this second LGP, and the described second colourity white light LEDs is common to connect another second circuit loop independently.

2, the backlight module with fine-tuning chromaticity function according to claim 1 is characterized in that: second of described first LGP and first face of second LGP are the plane.

3, the backlight module with fine-tuning chromaticity function according to claim 1, it is characterized in that: second of described first LGP and first face of second LGP are the identical inclined-plane of gradient, when this two inclined-plane contacted, first face of described first LGP was parallel to second of second LGP.

4, the backlight module with fine-tuning chromaticity function according to claim 1 and 2 is characterized in that: the described first colourity white light LEDs and the second colourity white light LEDs are located at the same side mutually of this first LGP and second LGP respectively.

5, the backlight module with fine-tuning chromaticity function according to claim 1 and 2 is characterized in that: the described first colourity white light LEDs is located at this first LGP side opposite with second LGP respectively with the second colourity white light LEDs.

6, the backlight module with fine-tuning chromaticity function according to claim 3 is characterized in that: the described first colourity white light LEDs and the second colourity white light LEDs are located at a side of this first LGP and the second light guide plate maximum respectively.

7, according to claim 1 or 2 or 3 described backlight modules, it is characterized in that: be provided with a diaphragm that possesses color between the incidence surface of the described first colourity white light LEDs and first LGP with fine-tuning chromaticity function.

8, according to claim 1 or 2 or 3 described backlight modules, it is characterized in that: be provided with a diaphragm that possesses color between the incidence surface of the described second colourity white light LEDs and second LGP with fine-tuning chromaticity function.

9, the backlight module with fine-tuning chromaticity function according to claim 2, it is characterized in that: the relative both sides of described first LGP are equipped with the described first colourity white light LEDs of plural number, and the relative both sides of described second LGP are equipped with the described second colourity white light LEDs of plural number.