CN201310771Y

CN201310771Y - Backlight module

Info

Publication number: CN201310771Y
Application number: CNU2008201993929U
Authority: CN
Inventors: 张智强; 方贞月; 陆韦中
Original assignee: Radiant Opto Electronics Suzhou Co Ltd
Current assignee: Radiant Opto Electronics Suzhou Co Ltd
Priority date: 2008-11-28
Filing date: 2008-11-28
Publication date: 2009-09-16
Anticipated expiration: 2018-11-28

Abstract

The utility model relates to a backlight module, which comprises a reflecting plate, a light guide plate, two cold cathode fluorescence lamps respectively arranged on both sides of the light guide plate, a light source hood, a lower diffusion sheet and a scattering reflective polarizer used for reflecting the S polarized light part and transmitting the P polarized light part of the incident light, wherein, the reflecting plate, the light guide plate, the lower diffusion sheet and the scattering reflective polarizer are sequentially placed in an overlapped manner. The scattering reflective polarizer can enable the S polarized light part of the incident light to be reflected, the reflected light passes through the reflection and then the full polarized light with S polarized light and P polarized light is newly formed, therefore, the light utilization ratio of the light source is improved, and the brilliance of the backlight module is further enhanced.

Description

Module backlight

Technical field

The utility model belongs to a kind of module backlight that is applied to liquid crystal display.

Background technology

Along with the develop rapidly of liquid crystal industry, brighter, more energy-conservation, more environmental protection, and reduce the core objective that manufacturing cost has become production development, traditional product structure can not satisfy production requirement.

Liquid crystal indicator is a kind of non-self-emission display apparatus, it shows mainly passing through or the obstructed realization of coming by control light beam that external light source sends, therefore need the corresponding backlight module with the beam direction display floater that external light source sent, to realize Presentation Function.

Accompanying drawing 1 and accompanying drawing 2 are sectional views of a kind of traditional liquid crystal indicator, this liquid crystal indicator comprises Polarizer 9 under a module 10 backlight and the liquid crystal panel, module 10 backlight comprises: a reflecting plate 1, four cold-cathode fluorescence lamps 2, a light source cover 3, a printing LGP 4, diffuser plate 7 on diffusion sheet 5, the prismatic lens 6 and once, this reflecting plate 1, printing LGP 4, diffusion sheet 5, prismatic lens 6 and last diffuser plate 7 stack gradually placement down.Wherein the diameter of 4 cold-cathode fluorescence lamps 2 is 2.4mm, operating current is 6 to 8mA, cold-cathode fluorescence lamp 2 lays respectively at the both sides of printing LGP 4, light source cover 3 is positioned at cold-cathode fluorescence lamp 2 opposite side of printing LGP 4 relatively, the light beam that reflection cold-cathode fluorescence lamp 2 sends is to increase the utilization rate of light source.The light beam that module 10 backlight sends is a full-polarization, the light vector that is cold-cathode fluorescence lamp 2 outgoing can decompose on S and these two orthogonal direction of vibration of P, this printing LGP 4 and reflecting plate 1 are with diffusion sheet 5 under the light guiding, the printing points of printing on the LGP 4 changes light path formation diffusion effect for adopting high reflection or high-refraction material mixed ink to be printed on reflective side, under process diffusion sheet 5, prismatic lens 6, on behind the collimating effect of diffuser plate 7, the light beam of originally dispersing is by with Polarizer 9 under the less angle of divergence directive liquid crystal panel.

And the polarized light property of Polarizer 9 makes its P light that only allows to be parallel to the polarization direction pass through under the liquid crystal panel, the S polarised light of perpendicular direction is all absorbed, so luminous energy is losing more than 50% by being absorbed during Polarizer 9 under the liquid crystal panel, therefore consumer's visual brightness is lower, and loss the part electric energy, the cost of LCD is also higher.

The utility model content

In order to overcome the lower shortcoming of the luminous utilization rate of die set light source backlight in the prior art, the purpose of this utility model provides a kind of luminous efficiency height, module backlight with low cost.

For achieving the above object, the technical scheme that the utility model adopted is: a kind of module backlight, it comprise reflecting plate, LGP, respectively be arranged at two cold-cathode fluorescence lamps, light source cover of described LGP both sides, diffusion sheet, one be in order to the S polarisation partial reflection of the incident light scatter-type reflective polarizers with the transmission of P polarisation part, this reflecting plate, LGP, diffusion sheet and the stacked in regular turn placement of scatter-type reflection-type mating plate down down.

The utility model further technical scheme is: the caliber of described cold-cathode fluorescence lamp is 2.8 to 3.8mm, is preferably 3.0 to 3.6mm.

The operating current of described cold-cathode fluorescence lamp is 8 to 12mA, is preferably 10mA.

The upper surface of described LGP offers a plurality of V-type grooves that extends longitudinally, and the lower surface of this LGP offers a plurality of V-type grooves along horizontal expansion.

More preferably, the upper surface of described LGP offers a plurality of V-type grooves that extends longitudinally, the lower surface of this LGP offers simultaneously along the V-type groove of horizontal expansion and the V-type groove that extends longitudinally, above-mentioned along horizontal expansion the V-type groove and the V-type groove that extends longitudinally that the lower surface of described LGP is divided into a plurality of pyramids is raised or sunken.

Between the Polarizer, described scatter-type reflective polarizers surface-coated has the atomizing layer of raising scattering function to described scatter-type reflective polarizers under described down diffusion sheet and liquid crystal panel.

Of the present utility model compared with prior art have a following advantage: 1, the utility model by the scatter-type reflective polarizers light reflection and circulation once more from LGP, thereby with the luminous energy accumulation, improve the efficiency of light energy utilization; 2, by strengthening the fluorescent tube caliber and increasing electric current, improve the glorious degrees of module backlight, but power consumption is less than the power consumption of the module backlight that 4 tubes are housed, in addition, reduced the use of 2 tubes, can also reduce cost, and can reduce the mercury content of module backlight, environmental protection more; 3, there is atomizing layer to handle in scatter-type reflective polarizers top and bottom, therefore outgoing beam is more dispersed, module backlight is luminous more even, has reduced the top diffusion sheet simultaneously and has made that also assembling is easier, reduce the integral thickness of module backlight, also saved production cost.

Description of drawings

Accompanying drawing 1 is traditional liquid crystal indicator sectional view;

Accompanying drawing 2 is the upward view of printing LGP;

Accompanying drawing 3 is a sectional view of the present utility model;

Accompanying drawing 4 is the upward view of LGP among the embodiment one;

Accompanying drawing 5 is the upward view of LGP among the embodiment two;

Accompanying drawing 6 is the vertical view of LGP;

Wherein: 1, reflecting plate; 2, cold-cathode fluorescence lamp; 3, light source cover; 4, LGP; 5, following diffusion sheet; 6, prismatic lens; 7, go up diffuser plate; 8, scatter-type reflective polarizers; 9, Polarizer under the liquid crystal panel; 10, module backlight.

The specific embodiment

The utility model will be further described below in conjunction with drawings and the specific embodiments, wherein, is vertically perpendicular to the direction of cold-cathode fluorescence lamp 2, and the direction that is parallel to cold-cathode fluorescence lamp 2 is for laterally.

To shown in the accompanying drawing 6, adopt the sectional view of liquid crystal indicator of the present utility model referring to accompanying drawing 3, this liquid crystal indicator comprises Polarizer 9 under module 10 backlight and the liquid crystal panel.Wherein, module backlight 10 of the present utility model comprises: reflecting plate 1, LGP 4, be arranged at two cold-cathode fluorescence lamps 2 of described LGP 4 both sides respectively, light source cover 3, following diffusion sheet 5, one in order to the S polarisation partial reflection of the incident light scatter-type reflective polarizers 8 with the transmission of P polarisation part, this reflecting plate 1, LGP 4, the stacked in regular turn placement of following diffusion sheet 5 and scatter-type reflective polarizers 8, described scatter-type reflective polarizers 8 is under down diffusion sheet 5 and liquid crystal panel between the Polarizer 9, two above-mentioned cold-cathode fluorescence lamps 2 lay respectively at LGP 4 both sides, light source cover 3 is positioned at the sidepiece of cold-cathode fluorescence lamp 2, the light beam that reflection cold-cathode fluorescence lamp 2 sends.

The utility model operation principle as shown in Figure 3, full-polarization light vector by cold-cathode fluorescence lamp 2 outgoing can decompose on S and these two orthogonal direction of vibration of P, this LGP 4 and reflecting plate 1 are with diffusion sheet 5 under the light guiding, light beam is incident in scatter-type reflective polarizers 8 after diffusion sheet 5 angle modification under process, scatter-type reflective polarizers 8 will be parallel to the P light outgoing of scatter-type reflective polarizers 8 polarized states, and the S light that reflects perpendicular to scatter-type reflective polarizers 8 polarized states returns backlight, when the S light that returns is being reflected when turning back to the upper surface of scatter-type reflective polarizers 8 by depolarization, again be incident in the scatter-type reflective polarizers after becoming full-polarization, prevented to be absorbed by light source and reduce energy, so circulating is used.

In general, the caliber of described cold-cathode fluorescence lamp 2 is 2.8 to 3.8mm, and the operating current of described cold-cathode fluorescence lamp 2 is 8 to 12mA.In most preferred embodiment of the present utility model, the caliber of described cold-cathode fluorescence lamp 2 is 3.0 to 3.6mm, and the operating current of described cold-cathode fluorescence lamp 2 is 10mA.

For further improving briliancy, the structure of LGP 4 can adopt as the dual mode of embodiment one and embodiment two and realize:

The upper surface of embodiment one, described LGP 4 offers a plurality of V-type grooves that extends longitudinally, and the lower surface of this LGP 4 offers a plurality of V-type grooves along horizontal expansion, shown in accompanying drawing 6 and accompanying drawing 4;

The upper surface of embodiment two, described LGP 4 offers a plurality of V-type grooves that extends longitudinally, the lower surface of this LGP 4 offers simultaneously along the V-type groove of horizontal expansion and the V-type groove that extends longitudinally, above-mentioned along horizontal expansion the V-type groove and the V-type groove that extends longitudinally that the lower surface of described LGP 4 is divided into a plurality of pyramids is raised or sunken, shown in accompanying drawing 6 and accompanying drawing 5.

For improving the luminous uniformity of module backlight, described scatter-type reflective polarizers 8 surface-coated have the atomizing layer that improves scattering function.

By above-mentioned embodiment, be not difficult to find out that the utility model can reduce the consumption and the manufacturing cost of electric power under the constant prerequisite of liquid crystal panel briliancy, simultaneously compliance with environmental protection requirements more.

Above embodiment only is explanation technical conceive of the present utility model and characteristics; its purpose is to allow the people that is familiar with this technology understand content of the present utility model and is implemented; can not limit protection domain of the present utility model with this; all equivalences of doing according to the utility model spirit essence change or modify, and all should be encompassed in the protection domain of the present utility model.

Claims

1, a kind of module backlight, it is characterized in that: it comprise reflecting plate (1), LGP (4), respectively be arranged at two cold-cathode fluorescence lamps (2), light source cover (3) of described LGP (4) both sides, diffusion sheet (5), one be in order to the S polarisation partial reflection of the incident light scatter-type reflective polarizers (8) with the transmission of P polarisation part, this reflecting plate (1), LGP (4), diffusion sheet (5) and the stacked in regular turn placement of scatter-type reflection-type mating plate (8) down down.

2, module backlight according to claim 1 is characterized in that: the caliber of described cold-cathode fluorescence lamp (2) is 2.8 to 3.8mm.

3, module backlight according to claim 2 is characterized in that: the caliber of described cold-cathode fluorescence lamp (2) is 3.0 to 3.6mm.

4, module backlight according to claim 1 is characterized in that: the operating current of described cold-cathode fluorescence lamp (2) is 8 to 12mA.

5, module backlight according to claim 4 is characterized in that: the operating current of described cold-cathode fluorescence lamp (2) is 10mA.

6, module backlight according to claim 1 is characterized in that: the upper surface of described LGP (4) offers a plurality of V-type grooves that extends longitudinally, and the lower surface of this LGP (4) offers a plurality of V-type grooves along horizontal expansion.

7, module backlight according to claim 1, it is characterized in that: the upper surface of described LGP (4) offers a plurality of V-type grooves that extends longitudinally, the lower surface of this LGP (4) offers simultaneously along the V-type groove of horizontal expansion and the V-type groove that extends longitudinally, above-mentioned along horizontal expansion the V-type groove and the V-type groove that extends longitudinally that the lower surface of described LGP (4) is divided into a plurality of pyramids is raised or sunken.

8, module backlight according to claim 1, it is characterized in that: described scatter-type reflective polarizers (8) is positioned at down under the diffusion sheet (5) and liquid crystal panel between the Polarizer (9), and described scatter-type reflective polarizers (8) surface-coated has the atomizing layer of raising scattering function.