CN2594829Y - Direct downward background light modules - Google Patents
Direct downward background light modules Download PDFInfo
- Publication number
- CN2594829Y CN2594829Y CN 02294470 CN02294470U CN2594829Y CN 2594829 Y CN2594829 Y CN 2594829Y CN 02294470 CN02294470 CN 02294470 CN 02294470 U CN02294470 U CN 02294470U CN 2594829 Y CN2594829 Y CN 2594829Y
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- Prior art keywords
- light
- reflecting
- backlight module
- type backlight
- plate
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Abstract
The utility model relates to a direct downward background light module, which comprises a plurality of light sources radiating light rays outwards, and a reflecting plate reflecting the light rays emitted by the plurality of light sources, wherein, one side of the reflecting plate has a plurality of reflecting grooves which are slightly in the shape of an arc. The number of the reflecting grooves which are slightly in the shape of an arc is corresponding to the number of the plurality of light sources, and each reflecting groove surrounds the corresponding light source in a half surrounded mode. The central part of each reflecting groove which is slightly in the shape of an arc has an upwards protuberant first reflecting surface; the left edge part of the reflecting groove has a second reflecting surface and a third reflecting surface; the right part has the same symmetrical structure. One side of a non-printed type light guiding plate which guides light rays to travel upwards facing the plurality of light sources has a plurality of light-transmission grooves which are in the shape of the arc to exhale light rays transmitting to the light-transmission grooves, and a coated cover to coat and support the reflecting plate and the light guiding plate. One light-transmission side of the light guiding plate is not coated by the coated cover.
Description
Technical field
The utility model relates to a kind of Staight downward type backlight module that is used for liquid crystal indicator, has the Staight downward type backlight module of a plurality of light sources and a plurality of and the corresponding reflecting curved surface of number of light sources in particularly a kind of reflex housing.
Background technology
In recent years, along with the aggregation degree of each position part of computing machine improves constantly, also constantly walking towards the demand of light, thin, short, little and low electric power for the requirement of peripheral product.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 liquid crystal battalion curtain.
At present, the lamp source that is usually used in lcd screen is cold-cathode tube (Cold CathodeFluorescent Lamp-CCFL) and thermionic-cathode tube (Hot Cathode FluorescentLamp-HCFL).And topmost assembly-backlight module generally can be categorized into two kinds of irradiated formula (direct part lighting type) and side-irradiation types (edge partlighting 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., light guiding plate).
As shown in Figure 1, show a traditional irradiated formula backlight module.With fluorescent tube 10 is illuminating source, and by a reflex housing 20 around coating.Upwards reflect and homogenising in order to the light that will radiate downwards.Upwards successively lamination by a diffuser plate 50, optics composite plate that once prism plate 70 is formed on the prism plate 60 and.
Each member in the above-mentioned backlight module all is fixed on the mould bases 90 as a supporting framework, and it produces by an ejection forming method.In addition, still 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 on the mould bases 90 by guide support.Similarly, mould bases 90 also has installation hole (not being shown in figure), so that whole Liquid Crystal Module is fixed in the display frame.
In aforesaid backlight module, the light of launching from fluorescent tube 10 is reflected by reflex housing 20, then, show that the image of seeking on the curtain is by being displayed by the light of diffuser plate 50, and utilize diffuser plate 50 to make equalizing light rays, and utilize a regioselective angle to make light at 60,70 o'clock by going up prism down and changed the route of advancing and vertically penetrating towards liquid crystal panel.
Yet, in backlight module,, must maintain a certain distance the situation that the brightness that produces to avoid luminous energy to concentrate on some specific region as shown in Figure 2 presents Wave crest and wave trough between diffuser plate 50 and the fluorescent tube 10 for the brightness that will make picture can have good all degree (uniformity) together.In the prior art, utilization prints additional the special printing-ink of one deck (as shown in Figure 3) on diffuser plate, to break up the energy of light, the practice although it is so can solve＜1〉all neat degree not good and＜2 see the problem of shinny light source body easily, but for keeping certain distance because of diffuser plate and fluorescent tube, cause＜3〉thickness increases with printing-ink meeting absorbing light energy itself, and the shortcoming of＜4〉picture brightness declines, and because of printing-ink serviceable life long material change and cause＜problem of 5〉picture yellows, still can't solve.
Therefore, in order will to overcome above-mentioned shortcoming and to take into account slim, the light-weighted purpose of backlight module, we need develop a kind of new structure with solve Staight downward type backlight module picture homogeneous degree not good, easily see illuminating source, brightness is lower, thickness can't lower and problem such as printing-ink flavescence.
The utility model content
In order to overcome the existing caused defective of method of above-mentioned tradition, fundamental purpose of the present utility model provides a kind of structure-improved of backlight module, with reach＜1 improve all degree together of picture;＜2〉brightness promotes;＜3〉reduce thickness; And＜4〉reduction is to the purpose of printing-ink dependence.
The another purpose of the utility model provides a kind of reflected bottom plate that is used for backlight module, it is according to the characteristic and the angle of energy of light source reflection, by the angle of specially designed reflecting curved surface with effective control light source radiation light reflection, the luminous energy that each light source is produced can evenly distribute to improve all spending together of picture.
The another purpose of the utility model provides a kind of reflected bottom plate that is used for backlight module, it is according to the characteristic and the angle of energy of light source reflection, by the situation of specially designed reflecting curved surface with mutual absorbing light energy between the reduction light source, and can effectively control the angle of light source radiation light reflection, shorten distance between light source and the diffuser plate by this with thickness that reduces backlight module and the brightness that has increased picture.
Another purpose of the present utility model provides a kind of reflected bottom plate that is used for backlight module, it is according to the characteristic and the angle of energy of light source reflection, by the angle of specially designed reflecting curved surface with effective control light source radiation light reflection, the luminous energy that each light source is produced can evenly distribute and must not use printing-ink just can reach required all the spending together of picture.
Another purpose of the present utility model provides a kind of light guide plate that is used for the non-printing-type of backlight module and replaces the diffuser plate that originally uses, the rough layer by having atomizing in it and itself be a light-transmitting materials and can take into account all degree and brightness together of picture simultaneously.
Another purpose of the present utility model provides a kind of light guide plate that is used for the non-printing-type of backlight module and replaces the diffuser plate that uses originally, owing to must not use diffuser plate, therefore can shorten the distance between light source and diffuser plate originally, reduce the thickness and the weight of backlight module whereby.
According to above-mentioned purpose, the utility model provides a kind of Staight downward type backlight module, and its primary structure includes a plurality of light sources, in order to externally to radiate light; One reflecting plate, in order to the reflection from the light that a plurality of light source sent, and wherein the one side have a plurality of slightly curved reflection recess, this reflecting plate is arranged at the below of a plurality of light sources.The number system of above-mentioned slightly curved reflection recess corresponding to a plurality of light sources and each reflection recess semi-ring around ground around living its corresponding light source, wherein, central part in each slightly curved reflection recess has first reflecting surface to upper process, left side edge in reflection recess partly then has one second reflecting surface and the 3rd reflecting surface, and the right side partly also has an identical symmetrical structure; One non-printing-type light guide plate, upwards advance in order to directing light, its one side towards these a plurality of light sources has a plurality of slightly curved printing opacity grooves, in order to disperse the light of directive printing opacity groove, it is arranged at the top of a plurality of light sources, and combines closely so that a plurality of light source package are overlying on wherein with the reflecting plate that is positioned at a plurality of light sources below; And one coat cover, and in order to coat and to support reflecting plate and light guide plate, wherein, the one side in order to printing opacity of light guide plate is coated cover and gives and coat.
The purpose of this utility model and plurality of advantages will reach with reference to appended icon, and be disclosed completely by the detailed description of following specific embodiment.
Description of drawings
Fig. 1 is the synoptic diagram of Staight downward type backlight module in the prior art;
Fig. 2 is the overlapping synoptic diagram of luminous energy respectively;
Fig. 3 is for having the diffuser plate synoptic diagram of printing-ink in the prior art;
Fig. 4 cuts open the sheet synoptic diagram for first embodiment's of the utility model Staight downward type backlight module;
Fig. 5 is the part amplification oblique drawing of first embodiment of the utility model Staight downward type backlight module;
Fig. 6 is the whole oblique view of first embodiment of the utility model Staight downward type backlight module;
Fig. 7 is the diagrammatic cross-section of second embodiment of the utility model Staight downward type backlight module;
Fig. 8 amplifies oblique diagrammatic sketch for the part of second embodiment of the utility model Staight downward type backlight module; And
Fig. 9 is the whole oblique view of second embodiment of the utility model Staight downward type backlight module.
Embodiment
Embodiment more of the present utility model can be described in detail as follows, and wherein, the different of assembly are not partly drawn according to physical size.Some yardstick is understood the utility model so that clearer description to be provided to help the stakeholder who is familiar with this skill with the expression that other partly relevant scale ratio system is exaggerated.
First embodiment:
As shown in Figure 4, light source 240 is placed on the top of reflecting plate 250, light source 240 is a fluorescent tube 240 at this, its diameter of phi is about 2.6 millimeters (mm) and is positioned at the reflection recess that slightly is camber of reflecting plate 250, this reflection recess semi-ring centers on light source 240 around ground as can be seen from Figure, and the central part of this reflection recess has first reflecting surface 210 of circular arc projection upwards, and its radius-of-curvature is about 2～3 times of light source 240 diameters; The edge part in this reflection recess left side has one second reflecting surface 220, and its angle of inclination is about between 20 degree～40 degree, is preferably 30 degree; And the 3rd reflecting surface 230, its angle of inclination is about between 40 degree～70 degree, be preferably 60 degree, and the right side partly also has an identical symmetrical structure.In addition, the h among Fig. 4
1Represent the distance of fluorescent tube 240 lower edge minimum points to first reflecting surface, 210 peaks, wherein, 1.0 centimetres＜h
1＜Φ/2; h
2Represent the distance of the center of circle of fluorescent tube 240 to reflecting plate 250 bottoms, wherein, (Φ/2)+h
1≤ h
2＜(Φ/2)+2h
1R
1Represent the radius-of-curvature of reflecting plate 250, wherein
R
1＞(Φ/2)+h
1(R
1Can change according to the needs in the design).
When the outside ray of light source 240, the light of advancing vertically downward under it can suitably upwards be reflected by first reflecting surface 210 of the circular arc projection that makes progress and can not stopped by light source 240, and the emission light of general incident angle is partly upwards reflected by other of reflection recess, more specifically, the utility model is at edge side set second reflecting surface 220 and the 3rd reflecting surface 230, can be with the general existing light that can't suitably reflect by these two specially designed reflectings surface, the light at directive reflection recess edge is upwards suitably reflexed to diffuser plate in the lump.
Fig. 5 is the part amplification oblique drawing of first embodiment.Fig. 6 is the whole oblique view of embodiment one.
Second embodiment:
Referring to Fig. 7, structure at the beginning and related coefficient but then are provided with a non-printing-type light guide plate 260 to replace existing employed diffuser plate promptly as shown in Figure 4 and Figure 5 again above light source 240 in embodiment 2, and light guide plate 260 radius-of-curvature are R
2, wherein, R
2 R
1In the present embodiment, the material of this non-printing-type light guide plate 260 is a transparent acryl material, it has a slightly curved printing opacity groove in the one side towards light source 240, in order to disperse the light of this printing opacity groove of directive, the position of this printing opacity groove is corresponding with the reflection recess of reflecting plate 250, light source 240 can be coated on wherein after both combinations.In addition, partly have the part refract light that a plurality of protruding parts 270 are produced in order to this light guide plate of light penetration the time being connected between the printing opacity groove of light guide plate 260 and printing opacity groove and give once more upwards reflection.In addition, the another side that has a plurality of printing opacity grooves in light guide plate 260 is provided with a plurality of rough layers 280, in order to diffuse through the light of light guide plate 260, further light is evenly disperseed, makes that the brightness of picture is more even.
Fig. 8 is the part enlarged drawing of second embodiment.Fig. 9 is the whole oblique view of second embodiment.
Being preferred embodiment of the present utility model only below, is not in order to limit the utility model claim; All other do not break away from the utility model and discloses equivalence change or the modification that spirit is finished down, all should be included in the following claim.
Main partly assembly numbering:
10 fluorescent tubes
20 reflectors
50 diffuser plates
60 times prisms
Prism on 70
80 baffles
90 mould bases
210 first reflectings surface
220 second reflectings surface
230 the 3rd reflectings surface
240 light sources
250 reflecting plates
260 light pipes
270 protruding parts
280 rough layers
300 light guide plate
Claims (10)
1. Staight downward type backlight module includes:
A plurality of light sources that externally radiate light;
One reflecting plate, wherein one side has a plurality of curved reflection recess, this reflecting plate is arranged on the below of these a plurality of light sources, the number of described curved reflection recess corresponding to a plurality of light sources and described each curved reflection recess semi-ring around ground around living its corresponding light source, wherein, the middle body of described each curved reflection recess has first reflecting surface to upper process, this groove left side edge partly has one second reflecting surface and the 3rd reflecting surface, and the right side partly also has an identical symmetrical structure; And
One coats and supports the coating cover of this reflecting plate, and wherein, the one side that has described curved reflection recess on this reflecting plate is coated cover and coats.
2. Staight downward type backlight module according to claim 1 is characterized in that, the radius of curvature R of this reflecting plate
1＞(Φ/2)+h
1, h wherein
1Be the distance of light source bottom minimum point to this first reflecting surface peak, Φ is the light source diameter.
3. Staight downward type backlight module according to claim 2 is characterized in that, this radius-of-curvature to first reflecting surface of upper process is 2～3 times of light source diameter of phi.
4. Staight downward type backlight module according to claim 3 is characterized in that, the angle of inclination of this second reflecting surface is spent between 40 degree between 20.
5. Staight downward type backlight module according to claim 4 is characterized in that, the angle of inclination of the 3rd reflecting surface is spent between 70 degree between 40.
6. Staight downward type backlight module according to claim 5 is characterized in that, the distance h of described curved groove light source corresponding with it
1Value be: 1.0mm＜h
1＜Φ/2.
7. Staight downward type backlight module according to claim 6 is characterized in that, described curved reflection recess radial height h
2Value be: (Φ/2)+h
1≤ h
2＜(Φ/2)+2h
1
8. Staight downward type backlight module according to claim 1 is characterized in that, also comprises:
The non-printing-type light guide plate that one directing light is upwards advanced, its one side towards described a plurality of light sources has a plurality of curved printing opacity grooves, to disperse the light of the described curved printing opacity groove of directive, described printing opacity groove is arranged on the top of a plurality of light sources, and combines closely should a plurality of light source package being overlying on wherein with the described reflecting plate that is positioned at this a plurality of light sources below; And
Described coating cover coats and supports above-mentioned light guide plate, and wherein, the one side of the printing opacity of above-mentioned light guide plate is not coated cover and coats.
9. Staight downward type backlight module according to claim 8 is characterized in that, the coupling part each other of described each curved printing opacity groove has the protruding part that a plurality of part refract lights that this light guide plate of light penetration is produced upwards reflect once more.
10. Staight downward type backlight module according to claim 8 is characterized in that, is provided with a plurality of rough layers that diffuse through the light of this light guide plate at the another side of a plurality of curved printing opacity grooves of having of described light guide plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02294470 CN2594829Y (en) | 2002-12-30 | 2002-12-30 | Direct downward background light modules |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02294470 CN2594829Y (en) | 2002-12-30 | 2002-12-30 | Direct downward background light modules |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2594829Y true CN2594829Y (en) | 2003-12-24 |
Family
ID=33751902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02294470 Expired - Fee Related CN2594829Y (en) | 2002-12-30 | 2002-12-30 | Direct downward background light modules |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2594829Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100350311C (en) * | 2004-03-15 | 2007-11-21 | 统宝光电股份有限公司 | Backlight module |
| CN101563565B (en) * | 2006-12-20 | 2011-07-06 | 夏普株式会社 | Illumination device for display device, and display device |
-
2002
- 2002-12-30 CN CN 02294470 patent/CN2594829Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100350311C (en) * | 2004-03-15 | 2007-11-21 | 统宝光电股份有限公司 | Backlight module |
| CN101563565B (en) * | 2006-12-20 | 2011-07-06 | 夏普株式会社 | Illumination device for display device, and display device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |