CN100535720C - Structure and method for increasing brightness in dark zone of optical background module - Google Patents
Structure and method for increasing brightness in dark zone of optical background module Download PDFInfo
- Publication number
- CN100535720C CN100535720C CNB2004100474343A CN200410047434A CN100535720C CN 100535720 C CN100535720 C CN 100535720C CN B2004100474343 A CNB2004100474343 A CN B2004100474343A CN 200410047434 A CN200410047434 A CN 200410047434A CN 100535720 C CN100535720 C CN 100535720C
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- guide plate
- light guide
- light
- backlight module
- light source
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Abstract
A method for increasing brightness of dark area in photonegative module cuts off light guide plate corner near to lamp tube electrode so light is drained out from the cut off position to increase brightness of the dark area for having better uniformity of light output from photonegative module.
Description
[technical field]
The present invention is about being used for promoting the structure and the method for dark corner brightness in a kind of backlight module, particularly form a top rake district relevant for the position near lamp tube electrode on a kind of light guide plate in backlight module, and the method that improves backlight module light output uniformity coefficient by this top rake district.
[background technology]
Backlight module is the assembly that is used to provide back side light source, can be applicable on the products such as LCD, mobile phone faceplate, negative scanner and lantern slide projection's machine, so that uniform surface light source output to be provided.Existing one its perspective view of side entrance back module of using L type cold-cathode tube can be with reference to Figure 1A.Backlight module 100 mainly is by a light guide plate (Light Guide Plate) 101, one reflecting element (ReflectionFilm) 103, the symmetrically arranged L type of two-phase cold-cathode tube (L-shape CCFL) 105, one diffusion sheet (Diffusion Film) 107, blooming piece (Optical film) 109 and is used for settling 111,113 of the frameworks of said elements to form.L type cold-cathode tube 105 is to be installed on around the light guide plate 101, make the light that is produced to enter in the light guide plate 101 in the mode of end face irradiation (edge light), and, make the diffusion sheet 107 of light above exporting to make distribution of light more even through reflection and after reflecting by the direction of light guide plate 101 directing light scatterings and the cooperation that is installed on light guide plate 101 below reflecting elements 103.Diffusion sheet 107 tops then can be provided with other blooming pieces with specific function 109, and the directivity that the prismatic lens (Prism) with optically focused effect increases light output for example is installed, and make effects such as front face brightness raising.
With reference to Figure 1B, it is that light guide plate 101 in the existing backlight module 100 and L type cold-cathode tube 105 are installed on the last skeleton view in the framework 113.Going up skeleton view thus can observe and learn, though the symmetrically arranged L type of two-phase cold-cathode tube 105 is installed on around the light guide plate 101, but L type cold-cathode tube 105 is own because can't be luminous in electrode area, and put the cause of rubber insulation sleeve 115, therefore in the light output of backlight module 100, will corner portions near the zone of electrode (such as dotted line 117 the scope of circle) produced luminance shortage " dark space ", and the output of whole light just have about or the generation of uneven up and down situation.
[summary of the invention]
Because in the foregoing invention background, relevant backlight module produces the problem of dark space in the corner regions near the lamp tube electrode position because of luminance shortage, the invention provides a kind of method that promotes dark space brightness in the backlight module, its purpose not only will reduce the chance that the dark space produces in the backlight module, also the luminous benefit of fluorescent tube in the backlight module can be improved simultaneously, make backlight module that the planar light output of one uniform luminance can be arranged.On the other hand, the present invention also provides a kind of structure of backlight module, not only makes light source can enter the dark corner in the backlight module and has improved the uniformity coefficient of whole backlight module light output, and on the other hand, this backlight module also has better radiating effect.
According to above-mentioned purpose, the invention provides a kind of structure and method that promotes dark space brightness in the backlight module, its corner near the lamp tube electrode position of light guide plate in the backlight module is eliminated, make that light source can be through top rake district thus and produce the situation of nature light leak, thereby promoted the brightness of this dark space, and increased the uniformity coefficient of the whole light output of backlight module; In addition, the light guide plate with top rake district provided by the present invention, the size and the external form of top rake adjusted in the scope at not only visual actual lamp pipe electrode position and position, simultaneously also because this top rake district makes that the heat radiation in the backlight module reaches better effect.
[description of drawings]
Figure 1A is the perspective view of existing backlight module.
Figure 1B is the last skeleton view of interior light guide plate of existing backlight module and light source.
The perspective view of the backlight module that the application the present invention's of Fig. 2 A system first preferred embodiment is provided.
Fig. 2 B is the last skeleton view of light guide plate and light source in the backlight module in first preferred embodiment.
Fig. 2 C cording lead the light guide plate of fillet structure and light source in backlight module on skeleton view.
The perspective view of the backlight module that the application the present invention's of Fig. 3 A system second preferred embodiment is provided.
Fig. 3 B is the last skeleton view of light guide plate and light source in the backlight module in second preferred embodiment.
[embodiment]
Next be detailed description of the present invention, in the following explanation description of each element in the backlight module do not comprised the complete description of its operation principles and assembling process.The existing skill that the present invention continued to use is only done quoting of emphasis formula at this, to help elaboration of the present invention.And relevant diagram is also drawn according to actual ratio in the following interior literary composition, and its effect is only giving expression to the present invention's feature.
First preferred embodiment system according to the present invention provides a kind of method and structure that is used for promoting dark corner brightness in the backlight module.At first with reference to Fig. 2 A, it is its perspective view of backlight module of using the present invention.The main system of backlight module 200 is by flat light guide plate 201, a reflecting element 203, light source 205, a diffusion sheet 207, a blooming piece 209 and be used for settling 211,213 of the frameworks of said elements to form.Light source 205 is to be selected from two symmetrically arranged L type cold-cathode tubes, and be installed on around the light guide plate 201, make the light that is produced to enter in the mode of end face irradiation in the light guide plate 201 (present embodiment adopts the light source incident mode of a side entering type), and, make the diffusion sheet 207 of light above exporting to make distribution of light more even through reflection and after reflecting by the direction of light guide plate 201 directing light scatterings and the cooperation that is installed on light guide plate 201 below reflecting elements 203.Diffusion sheet 207 tops then can be provided with other blooming pieces with specific function 209.
Simultaneously with reference to Fig. 2 B, it is that light guide plate 201 in the backlight module 200 and L type cold-cathode tube 205 are installed on the last skeleton view in the framework 213.Going up skeleton view thus can clear view, backlight module 200 provided by the present invention, one of its feature is promptly (not shown in the figures with light guide plate 201 its electrode area near light source 205, because of being insulated 215 encirclements of cover) the corner eliminated, make light guide plate 201 near the position in these corners, dark space (such as dotted line 217 the scope of circle) have a top rake profile.Thus, the light that light source 205 sent just can produce the situation of nature light leak via the top rake district of light guide plate 201, and the light of this dark space also just can enter light guide plate 201 tops after reflecting element 203 reflections diffusion sheet 207 carries out subsequent treatment; Therefore, the brightness of dark space just can be compensated, and makes the light output of backlight module integral body can reach even.
In the present embodiment, light guide plate 201 is the lead angle of a rib type in the corner near light source 205 electrodes, but the top rake external form of light guide plate 201 is not as limit, and with reference to the scope that dotted line 219 among Fig. 2 C is enclosed, this light guide plate 201 also can have the fillet of leading of a circular arc external form; And other corresponding these dark spaces and the top rake district that forms also all can specifically implement according to the present invention on light guide plate 201, as long as can cremasteric reflex part 203 with 207 of diffusion sheets have one directly the structure of perforation can reach the effect of nature light leak, and the heat-dissipating space additionally that also allowed backlight module more than 200.
Second preferred embodiment system according to the present invention provides a kind of method and structure that is used for promoting dark corner brightness in the backlight module.At first with reference to Fig. 3 A, it is its perspective view of backlight module of using the present invention.Backlight module 300 mainly is by a wedge type light guide plate 301, a reflecting element 303, a light source 305 and a peripheral reflecting element (not shown), a diffusion sheet 307, blooming piece 309 and is used for settling 311,313 of the frameworks of said elements to form.Light source 305 can be cold-cathode tube, system is installed on the end face (light entrance face) of wedge type light guide plate 301 thick sides, make the light that is produced to enter in the mode of end face irradiation in the wedge type light guide plate 301 (present embodiment adopts the light source incident mode of a side entering type), by the wedge type moulding of wedge type light guide plate 301 and cooperating of reflecting element 303, make the diffusion sheet 307 of light above exporting to make distribution of light more even through reflection and after reflecting.And diffusion sheet 307 tops also can be provided with other blooming pieces with specific function 309.
Simultaneously with reference to Fig. 3 B, it is that wedge type light guide plate 301 in the backlight module 300 and light source 305 are installed on the last skeleton view in the framework 313.Figure can clear view thus, backlight module 300 provided by the present invention, one of its feature is promptly (not shown in the figures with wedge type light guide plate 301 its electrode area near light source 305, because of being insulated 315 encirclements of cover) the corner eliminated, make wedge type light guide plate 301 near the position in this corner, dark space (such as dotted line 319 the scope of circle) a top rake external form (structure of fillet is led in top rake external form system selection in the present embodiment) arranged.Thus, the light source that light source 305 sent just can produce the situation of nature light leak via the top rake district of wedge type light guide plate 301, and the light of dark corner also just can enter the diffusion sheet 307 of wedge type light guide plate 301 tops and carries out subsequent treatment after reflecting element 303 reflection; Therefore, the brightness of dark space just can be compensated, and makes the light output of backlight module integral body can reach even.
Can learn by above-mentioned first and two preferred embodiment according to the present invention, the light guide plate in tool top rake provided by the present invention district, what the external form of its top rake can be the lead angle of prismatic or circular arc leads fillet or other external form, and also can be formed on the light guide plate of plate and wedge type, so no matter the fluorescent tube that this backlight module adopted is that linear pattern (is formed a rectangular-shaped light source by four linear pattern fluorescent tubes, or single linear pattern fluorescent tube), the U type, C type and L type fluorescent tube, as long as can on light guide plate, can reach the effect of nature light leak in corner or the side formation top rake district near the lamp tube electrode position, and allow the luminescence efficiency of fluorescent tube reach maximum; And the present invention do not limit the light source incident mode (light entrance face of light guide plate has vertical angle with light gasing surface) that only is applicable to side entering type yet, and for example the backlight module of straight-down negative (light entrance face of light guide plate is parallel with light gasing surface) also can be according to the present invention and concrete enforcement for other.
In sum, the method for dark space brightness in the lifting backlight module provided by the present invention, promptly at least one light source of emission (comprising linear pattern, U type, L type and C type fluorescent tube etc.) enters in the light entrance face (comprising plate and the wedge type light guide plate) of a light guide plate earlier; Light just can be via being derived by the light gasing surface of this light guide plate after the guiding of light guide plate afterwards.But, because the electrode area of fluorescent tube can't be luminous, and be covered with an insulation sleeve, so dark space that the position at close lamp tube electrode position will produce luminance shortage in light guide plate, make the light output uniformity coefficient of whole backlight module reduce, so the present invention with regard to the position that proposes corresponding these dark spaces in light guide plate form a top rake structure (for example if when adopting two symmetrical L type fluorescent tubes, the light guide plate formation one top rake district that just can fall at two relative angles near electrode area; And if in light guide plate the position at corresponding lamp tube electrode position not in the corner, also can be chosen in the effect that the groove structure that forms depression on the light guide plate side reaches the nature light leak), thus, the light that is positioned at the so-called dark space of backlight module just can directly pass through the top rake district, and exhale (for example via reflecting element reflection or the modes such as diffusion sheet that directly enter the light guide plate top) by the mode of reflection or directly emission, so just can improve the brightness of these dark spaces in the backlight module and the light of the integral body that makes is exported uniformity coefficient and can be improved.
Claims (10)
1. backlight module comprises:
One light guide plate, this light guide plate comprise a light gasing surface, a light entrance face; And
One light source, wherein this light source is a fluorescent tube, has a light source electrode and another light source electrode, this light source is disposed at by the light entrance face of this light guide plate, and this light guide plate has a top rake in the dark space near this light source electrode area.
2. backlight module according to claim 1 is characterized in that, the external form of this top rake is a lead angle.
3. backlight module according to claim 1 is characterized in that the external form of this top rake is to lead fillet.
4. backlight module according to claim 1 is characterized in that, this light guide plate is a plate light guide plate.
5. backlight module according to claim 1 is characterized in that, this light guide plate system adopts the light source incident mode of side entering type.
6. backlight module according to claim 1 is characterized in that, this light source system is made up of four linear pattern fluorescent tubes, and is arranged at around this light guide plate.
7. backlight module according to claim 1 is characterized in that, this light guide plate system adopts the light source incident mode of straight-down negative.
8. backlight module according to claim 1 is characterized in that, this light guide plate is a wedge type light guide plate.
9. backlight module according to claim 1, it is characterized in that, described module is included in further under this light guide plate relatively that a side of light output face is provided with a reflecting element, make that light that this side from this light guide plate reflects can be via this this light guide plate of reflecting element reflected back in.
10. backlight module according to claim 1 is characterized in that, this light source is a cold-cathode tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100474343A CN100535720C (en) | 2004-05-28 | 2004-05-28 | Structure and method for increasing brightness in dark zone of optical background module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100474343A CN100535720C (en) | 2004-05-28 | 2004-05-28 | Structure and method for increasing brightness in dark zone of optical background module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1584698A CN1584698A (en) | 2005-02-23 |
| CN100535720C true CN100535720C (en) | 2009-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100474343A Expired - Fee Related CN100535720C (en) | 2004-05-28 | 2004-05-28 | Structure and method for increasing brightness in dark zone of optical background module |
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| CN (1) | CN100535720C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100403113C (en) * | 2005-05-24 | 2008-07-16 | 群康科技(深圳)有限公司 | Backlight unit set and liquid crystal display device |
| CN102954391A (en) * | 2011-08-19 | 2013-03-06 | 冠捷投资有限公司 | Backlight module |
| CN105448250B (en) * | 2014-08-28 | 2018-07-27 | 奇景光电股份有限公司 | The grid drive method and drive module of display |
| US10317729B2 (en) * | 2015-12-18 | 2019-06-11 | Sakai Display Products Corporation | Display device |
| CN107632423A (en) * | 2017-09-16 | 2018-01-26 | 合肥惠科金扬科技有限公司 | A kind of manufacturing process of the guide-lighting board supporting structure of liquid crystal panel backlight module |
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2004
- 2004-05-28 CN CNB2004100474343A patent/CN100535720C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1584698A (en) | 2005-02-23 |
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