CN1512233A - Back light module - Google Patents
Back light module Download PDFInfo
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- CN1512233A CN1512233A CNA021583781A CN02158378A CN1512233A CN 1512233 A CN1512233 A CN 1512233A CN A021583781 A CNA021583781 A CN A021583781A CN 02158378 A CN02158378 A CN 02158378A CN 1512233 A CN1512233 A CN 1512233A
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- light
- curved surface
- guide plate
- light source
- module backlight
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Abstract
The back light module has the main structure comprising one light guiding plate for guiding and collecting light beams; two light sources set beside the light guiding plate and in a straight line with the light guiding plate; and one reflecting hood enclosing the two light sources completely and with two ends connected to the ends of the light guiding plate for fixing. The reflecting hood has one first reflecting curved surface and one second reflecting curved surface corresponding to the two light sources separately for reflecting the light emitted by the two light sources to the light guiding plate.
Description
Technical field
The present invention relates to a kind of module backlight that is used for liquid crystal indicator, have a plurality of light sources and a plurality of and corresponding reflecting curved surface of number of light sources in particularly a kind of reflex housing.
Background technology
In recent years, along with the integrated level of each position part of computer improves constantly, for the requirement of peripheral product also constantly towards light, book, weak point, the development of little and low power direction.Compared to other display device, CRT for example, LCD then is the device of a kind of small size and low power consumption.Because liquid crystal molecule itself is not idiopathic light-emitting device, so LCD also needs an electroluminescent lamp source except LCD screen.
At present, the lamp source that is usually used in lcd screen is cold-cathode tube (Cold Cathode FluorescentLamp-CCFL) and thermionic-cathode tube (Hot Cathode Fluorescent Lamp-HCFL).And topmost element one module backlight generally can be categorized into two kinds of irradiated formula (direct part lighting type) and side-irradiation types (edge part lighting type) according to the position in electroluminescent lamp source.In the irradiated formula, irradiates light is homogenized by a diffusion sheet, scatter in the liquid crystal panel then, and on the other hand, side-irradiation type then is transformed into a sheet light source earlier by a light guide plate (L.G.P., lightguiding plate).
As shown in Figure 1, it is to show a traditional side-irradiation type module backlight.With fluorescent tube 10 is a light source, and by a reflex housing 20 around coating.One light guide plate 30 is arranged at a side of fluorescent tube 10, in order to reflected light is disperseed and homogenising.By a diffuser plate 50, optics composite plate that once prism plate 70 is formed on the prism plate 60 and is arranged at the upper surface of light guide plate 30, the lower surface of light guide plate 30 then is provided with a reflecting plate 40.
Diffuser plate 50 is the incident light (not shown) that are used for improving liquid crystal panel.Reflecting plate 40 is the situations that are used for avoiding producing towards the light of light guide plate 30 bottoms light leak, and will be reflected perpendicular to the light on light guide plate 30 tops.Following prism plate 60 and last prism plate 70 are to be used for changing the route that light is advanced; it is formed by a succession of triangular groove or hemispherical groove by succession; in order to protect down the outward appearance of prism plate 60 and last prism plate 70; last prism plate 70 is provided with a fender 80, and liquid crystal panel then is arranged at above the fender 80.
Each member in the above-mentioned module backlight all is fixed on the mould bases 90 as a supporting framework, and it is to produce by an ejection forming method.In addition, also have four guide support (not being shown among the figure) to be used for regarding the assembling substrate in above-mentioned each plate four corners in mould bases 90, each plate is fixed by guide support and is lain on the mould bases 90 by Continuous pressing device for stereo-pattern.Similarly, mould bases 90 has and also has installation hole (not being shown among the figure), so that whole liquid crystal module is fixed in the display frame.
In aforesaid module backlight, the light of launching from fluorescent tube 10 is reflected by reflex housing 20, and then, the image on the display screen is by being displayed by the light of light guide plate 30 and diffuser plate 50.In addition, the light of launching from fluorescent tube 10 has been avoided the situation of light leak by the existence of reflecting plate 40, and afterwards light towards light guide plate 30 and scattering.Next, utilize diffuser plate 50 to make equalizing light rays, and utilize a regioselective angle to make light change the route of advancing at 60,70 o'clock and vertically penetrate towards liquid crystal panel by upper and lower prism.
Yet present module backlight is in order to improve briliancy dealing with various demands, and more known (shown in Fig. 2 A, element number 210 is a fluorescent tube, and it measures the brightness L=2600cd/m of gained just research and propose employing
2) more large-scale fluorescent tube (shown in Fig. 2 B, element number 220 is a fluorescent tube), or adopt the above design of two fluorescent tubes (shown in Fig. 2 C and 2D, element number 230,240,250 and 260 is all fluorescent tube) to meet the requirement of high briliancy.Though but adopt among Fig. 2 B or the mode among Fig. 2 C, the thickness and weight (the brightness L=3300cd/m of Fig. 2 B of module backlight when increasing briliancy, increased also in the lump
2, Fig. 2 C brightness L=4500cd/m
2), therefore and do not meet the trend and the requirement of existing design.In 2D figure, because two fluorescent tubes are to adopt parallel arrangement mode, therefore the situation of absorbing light energy is very serious mutually between fluorescent tube, particularly be arranged at the fluorescent tube 260 of back, its wide part of launching is all absorbed by fluorescent tube 250 or stops, the brightness data of this module backlight actual measurement gained 2700cd/m that only has an appointment
2
Therefore, in order to overcome above-mentioned defective and to take into account slim, the light-weighted purpose of module backlight, we need develop a kind of new structure to address the above problem.
Summary of the invention
According to the caused defective of above-mentioned conventionally known method, fundamental purpose of the present invention provides a kind of improvement structure of module backlight, to reach slimming, light-weighted purpose.
A further object of the present invention provides a kind of reflex housing that is used for module backlight, by the situation of specially designed reflecting curved surface with mutual absorbing light energy between the reduction fluorescent tube, and light suitably reflexed to light guide plate in the module backlight, to reach the purpose that improves briliancy.
According to above-mentioned purpose, the invention provides a kind of module backlight, its main structure includes a light guide plate, is used for guiding and collection light; One first light source and a secondary light source are located at a side of light guide plate and are arranged in a straight line with this light guide plate; An and reflex housing, fully around coating two light, and its two ends connect and are fixed on two ends of light guide plate same side respectively, wherein, reflex housing inside has one first reflecting curved surface and one the 3rd reflecting curved surface, correspond respectively to this two light sources, this reflecting curved surface is to be used for two light that light source radiated are reflexed to light guide plate.By above-mentioned first reflecting curved surface and second reflecting curved surface two light sources are suitably separated, therefore avoided mutual endergonic situation between light source, and separately light has been reflexed to light guide plate and improved whole briliancy.And because light guide plate, first light source and secondary light source three are arranged in a straight line, therefore, the thickness of module backlight is minimized, and has relatively also reduced the weight of module backlight.
Purpose of the present invention and plurality of advantages will be by the detailed descriptions of following specific embodiment, and disclosed completely with reference to accompanying drawing.
Description of drawings
Fig. 1 is the synoptic diagram for known module backlight;
Fig. 2 A is respectively the synoptic diagram of known four kinds of modules backlight to 2D;
Fig. 3 is the cut-open view for module backlight of the present invention; And
Fig. 4 is the oblique view for module backlight of the present invention.
Embodiment
Some embodiments of the present invention can be described in detail as follows, and wherein, the different piece of element is not drawn according to physical size.The expression that the scale ratio that some yardstick is relevant with other parts is exaggerated is understood the present invention so that clearer description to be provided to help the stakeholder who is familiar with this skill.
As shown in Figure 3, the main structure of module backlight of the present invention includes a light guide plate 300, and it is to be used for guiding and collection light; One first light source 320 and a secondary light source 330, this light source can be cold-cathode tube, light emitting diode or other light source that is fit to, these two light sources are to be arranged at a side of light guide plate 300 and to be arranged in a straight line (in Fig. 3, being light guide plate 300, first light source 320 and the 3rd light source 330 from left to right in regular turn) with light guide plate 300; And a reflex housing 310, it is fully around coating first light source 320 and secondary light source 330, and its two ends connect respectively and are fixed on two ends of light guide plate 300 same sides.
By among Fig. 3 as can be seen reflex housing 310 inside have one first reflecting curved surface 311 and one second reflecting curved surface 313, correspond respectively to first light source 320 and secondary light source 330, and first reflecting curved surface 311 and one second reflecting curved surface, 313 places of interconnecting have a projection 312, in the present embodiment, the height of this projection 312 is not higher than between the two light source centers of circle surface level of the axis X that links to each other, and reflecting curved surface 311 and 312 is to be used for the light that first light source 320 and secondary light source 330 are launched is reflexed to light guide plate 300 at this.
Fig. 4 is the oblique view of the present invention's module backlight.From Fig. 3 and Fig. 4 as can be seen, because above-mentioned first reflecting curved surface 311 and second reflecting curved surface 313 suitably separate two light sources, therefore avoided mutual endergonic situation between light source, the while also reflexes to light guide plate 300 with light separately and has improved whole bullet degree.Through actual measurement, the briliancy of being measured in the present embodiment is 4300cd/m
2, be significantly improved really with respect to known module backlight.And because light guide plate 300, first light source 320 and secondary light source 330 threes are arranged in a straight line, therefore, the thickness of module backlight is minimized, and has relatively also reduced the weight of module backlight.
Being the preferred embodiments of the present invention only below, is not in order to limit protection scope of the present invention; All other do not break away from the equivalence of being finished under the disclosed spirit and changes or modification, all should be included in the scope of claims of the present invention.
Claims (10)
1, a kind of module backlight comprises:
One light guide plate is used for guiding and collection light;
One or more light source is located at a side of this light guide plate, and is arranged in a straight line with this light guide plate;
One reflex housing, fully around coating this one or more light source, and its two ends connect and are fixed in two ends of this light guide plate same side respectively, wherein, this reflex housing inside has one or more reflecting curved surface, and each reflecting curved surface entity all respectively reflexes to this light guide plate corresponding to this one or more light source in order to light that will this one or more light source radiated.
2, module backlight as claimed in claim 1 is characterized in that, the number of this reflecting curved surface is corresponding to the number of this light source.
3, module backlight as claimed in claim 1 is characterized in that, visual its light source form of entity correspondence and different separately of the curved surface radian of this each reflecting curved surface.
4, module backlight as claimed in claim 1 is characterized in that, this light source is a cold-cathode tube.
5, module backlight as claimed in claim 1 is characterized in that, this light source is a light emitting diode.
6, a kind of module backlight comprises:
One light guide plate is used for guiding and collection light;
Two light sources are located at a side of this light guide plate and are arranged in a straight line with this light guide plate;
One reflex housing, fully around coating this two light sources, and its two ends connect and are fixed in two ends of this light guide plate same side respectively, wherein, this reflex housing inside has one first reflecting curved surface and one second reflecting curved surface, correspond respectively to this two light sources, in order to these two light that light source radiated are reflexed to this light guide plate.
7, module backlight as claimed in claim 6 is characterized in that, visual its each self-corresponding light source form of the curved surface radian of this first reflecting curved surface and this second reflecting curved surface and different.
8, module backlight as claimed in claim 7 is characterized in that, this first reflecting curved surface and this second reflecting curved surface are interconnected with one another, and the rising height of junction is no more than the surface level of the axis that links to each other between this two light sources center of circle.
9, module backlight as claimed in claim 6 is characterized in that, this light source is a cold-cathode tube.
10, module backlight as claimed in claim 6 is characterized in that, this light source is a light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021583781A CN1512233A (en) | 2002-12-30 | 2002-12-30 | Back light module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021583781A CN1512233A (en) | 2002-12-30 | 2002-12-30 | Back light module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1512233A true CN1512233A (en) | 2004-07-14 |
Family
ID=34236994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA021583781A Pending CN1512233A (en) | 2002-12-30 | 2002-12-30 | Back light module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1512233A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100371803C (en) * | 2006-03-08 | 2008-02-27 | 友达光电股份有限公司 | Light guiding structure |
| US7591577B2 (en) | 2006-01-27 | 2009-09-22 | Au Optronics Corp. | Light emitting device having reflective surfaces extended from light incident surfaces |
-
2002
- 2002-12-30 CN CNA021583781A patent/CN1512233A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7591577B2 (en) | 2006-01-27 | 2009-09-22 | Au Optronics Corp. | Light emitting device having reflective surfaces extended from light incident surfaces |
| CN100371803C (en) * | 2006-03-08 | 2008-02-27 | 友达光电股份有限公司 | Light guiding structure |
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