CN1584699A - Structure and method for light background module internal compensated dark space brightness - Google Patents
Structure and method for light background module internal compensated dark space brightness Download PDFInfo
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- CN1584699A CN1584699A CN 200410047435 CN200410047435A CN1584699A CN 1584699 A CN1584699 A CN 1584699A CN 200410047435 CN200410047435 CN 200410047435 CN 200410047435 A CN200410047435 A CN 200410047435A CN 1584699 A CN1584699 A CN 1584699A
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- guide plate
- light guide
- backlight module
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Abstract
A method for compensating brightness at dark area in photonegative module form multiple groove structure on sideframe connected with light guide plate to increase light reflection area between sideframe and light guide plate so brightness at dark area and two sides of light guide plate is compensated for achieving better uniformity for photoegative module light output.
Description
[technical field]
The present invention is the structure that is used for compensating dark corner in relevant a kind of backlight module, particularly relevant for a kind of structure that in the side frame in backlight module, forms groove, and the method that improves backlight module light output uniformity coefficient by this groove structure.
[background technology]
Backlight module is in order to the assembly of back side light source to be provided, to 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.Its schematic perspective view of backlight modular structure of an existing employing side entering type light source can be with reference to Figure 1A.Backlight module 100 mainly is made up of a light guide plate 101, a reflecting plate 103, a cold-cathode tube 105, a reflecting element 107, a prismatic lens 109 and blooming piece 111 with other functions.Cold-cathode tube 105 is to be surrounded by a hood-shaped reflecting element 105, makes the light that is produced can import the light entrance face of light guide plate 101 again via the opening of reflecting element 107 after reflecting element 107 internal reflections.Light guide plate 101 mainly then is used for the direction of directing light diffusion, and from Figure 1A as can be seen, this 101 light guide plate is to adopt the wedge type light guide plate of V-cut pattern, its bottom surface system is made up of a plurality of V-type grooves that are arranged in parallel, and at positioned beneath one reflecting plate 103, make light after entering light guide plate 101, can see through the action that a plurality of V-type grooves that are arranged in parallel reflect and reflect, last light exports the prismatic lens 109 of top to via the light gasing surface of light guide plate 101.And prismatic lens 109 can produce jagged groove by pasting acryl resin or directly penetrating, we can find with reference to Figure 1A, a plurality of grooves that are arranged in parallel on the prismatic lens 109, the orientation of V-type groove is the situation of vertical interlaced on the orientation of its groove and the light guide plate 101, just can cooperate with light guide plate 101 thus and produces a uniform distribution of light.Last light is done via optics matrix 111 and is promptly exported on the applied product for example LCD after other are further handled to.
In backlight module 100, can be by the combination of many frameworks, make elements such as light guide plate 101, reflecting plate 103, cold-cathode tube 105, reflecting element 107 and prismatic lens 109 can insert wherein, and framework itself also can be helped backlight module 100 with particular structure or material and reached more effect.In Figure 1A, definition is a benchmark with the direction of cold-cathode tube 105 light output, and it is close to the side frame 113 of light guide plate 101 and reflecting element 107 both sides, the just action that can help light guide plate 101 to reflect in two sides; And, then can be used to fixation reflex spare 107 and light guide plate 101 directly in the face of the preceding frame 117 of cold-cathode tube 105 light gasing surfaces and the back of the body frame 115 that is positioned at reflecting element 107 rears.
With reference to Figure 1B, it is the last skeleton view of light guide plate 101, reflecting element 107, cold-cathode tube 105, two side frames 113, preceding frame 117 and back of the body frame 115.Wherein not luminous in the electrode area of cold-cathode tube 105 both sides itself, and added and be used for the insulation sleeve 119 of guard electrode, so just hindered light and entered the approach of light guide plate 101 both sides near the light inlet corner, make light guide plate 101 on corner, produce the dark space of a luminance shortage (scope of being enclosed as dotted line 121) near light inlet, the product that causes using this backlight module 100 has a shadow region to produce on visual appearance, has influenced the output quality of whole backlight module 100; If but cold-cathode tube 105 length lengthening is solved the problem that above-mentioned dark space produces, and whole backlight module 100 sizes can be strengthened and gain in weight on the contrary, also improved the production cost of whole backlight module 100 simultaneously.Therefore need that the light inlet corners produce the method and the structure of dark space in a kind of compensate for backlight module 100 badly, can not have influence on the size of backlight module 100 originally, the length of the cold-cathode tube that also need not extend and increase production cost.
With reference to Figure 1A, Fig. 1 C and Fig. 1 D, the orientation of light guide plate 101 its a plurality of V-type grooves in below of wedge type is vertical with the orientation of cold-cathode tube 105 fluorescent tubes, so light could be passed in the whole light guide plate 101, but also because so, being arranged in light guide plate 101 both sides will become the dark space (scope of being enclosed as Fig. 1 C dotted line 123) of a luminance shortage near the zone of side frame 113, and be arranged in light guide plate 101 the place aheads and also can produce the problem of luminance shortage near the zone of preceding frame 117 (scope of being enclosed as Fig. 1 D dotted line 125), and influenced the light output quality of whole backlight module 100.Zone if increased extra framework volume on side frame 113 and preceding frame 117 with the backlight module both sides hides, though can in the light output of backlight module 100, reduce the luminance difference of side and middle section, waste the luminescence efficiency of backlight module 100 sides originally for no reason at all for no reason.Therefore need both sides in a kind of compensate for backlight module and front side zone luminance shortage badly and become the method and the structure of dark space, solve the problem that the dark space produces not wasting under the luminescence efficiency of backlight module 100 originally, make backlight module produce uniform output backlight.
[summary of the invention]
Because in the foregoing invention background, inherent light inlet corner regions of relevant backlight module and two side areas visually produce the problem of shadow region because of luminance shortage, the invention provides a kind of side frame structure that is applied in the backlight module, its purpose chance that the dark space produces in reducing backlight module, and need not increase the length of cold-cathode tube in original backlight module, and utilize the interior framework of script backlight module can increase the utilization factor of light source.On the other hand, the invention provides the method that increases dark corner brightness in a kind of backlight module, make the backlight module of adopting said method to produce uniform surface light source output.
According to above-mentioned purpose, the invention provides the structure and the method that are used for compensating dark space brightness in a kind of backlight module, on side frame with reflection characteristic, form a plurality of groove structures, make and increased the zone of action of light reflection between side frame and the light guide plate, thus, light guide plate both sides and close its brightness of so-called dark space, incidence surface corner just can promote, and the output of the light of whole backlight module just can be more even.In addition, provided by the present invention not only the making in the method that forms groove on the side frame reached easily, also can improve simultaneously backlight module originally on light source utilization factor and need not increase extra cost.
[description of drawings]
Figure 1A is the perspective view of existing backlight module.
In the existing backlight module of Figure 1B to Fig. 1 D system, the zone that the dark space produces.
The backlight module perspective view that Fig. 2 A system is provided according to the present invention's first preferred embodiment.
In Fig. 2 B system first preferred embodiment according to the present invention, rectangular recess in backlight module on skeleton view.
The backlight module perspective view that Fig. 3 A system is provided according to the present invention's second preferred embodiment.
In Fig. 3 B system second preferred embodiment according to the present invention, a plurality of V-type grooves in backlight module on skeleton view.
The backlight module perspective view that Fig. 4 A system is provided according to the present invention's the 3rd preferred embodiment.
In Fig. 4 B to Fig. 4 C system the 3rd preferred embodiment according to the present invention, the V-type groove in backlight module on skeleton view.
The backlight module perspective view that Fig. 5 A system is provided according to the present invention's the 4th preferred embodiment.
In Fig. 5 B system the 4th preferred embodiment according to the present invention, a plurality of V-type grooves in backlight module on skeleton view.
[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.
The structure of dark corner in a kind of compensate for backlight module is provided according to the present invention's first preferred embodiment system, at first with reference to the perspective view shown in Fig. 2 A, the blooming piece 211 that backlight module 200 main systems adopt light guide plate 201, a reflecting plate 203, a cold-cathode tube 205, a reflecting element 207, a prismatic lens 209 of side entering type light source incident mode by one and have other functions is formed.Cold-cathode tube 205 is to be surrounded (reflecting element of slab structure also can specifically be implemented according to the present invention) by a hood-shaped reflecting element 205, makes the light that is produced can import the light entrance face (directly facing the side of cold-cathode tube 205 in the light guide plate 201) of light guide plate 201 again via the opening of reflecting element 207 after reflecting element 207 internal reflections.Light guide plate 201 is to select to adopt one to have the light guide plate of a plurality of V-type grooves that are arranged in parallel in the present embodiment, main then be used for the direction of directing light diffusion, its bottom surface can form a reflecting surface, perhaps described in this enforcement, thereunder settle a reflecting plate 203, make light after entering light guide plate 201, can see through the action that a plurality of V-type grooves that are arranged in parallel reflect and reflect, last light exports the prismatic lens 209 of top to via the light gasing surface (facing the side of prismatic lens 209 in the light guide plate 201) of light guide plate 201.And prismatic lens 209 can produce jagged groove by pasting acryl resin or directly penetrating, we can find with reference to Fig. 2 A, a plurality of grooves that are arranged in parallel on the prismatic lens 209, the orientation of V-type groove is the situation of vertical interlaced on the orientation of its groove and the light guide plate 201, just can cooperate with light guide plate 201 thus and produces a uniform distribution of light.Last light is done via optics matrix 211 and is promptly exported on the applied product for example LCD after other are further handled to.
In the present embodiment, be positioned at the side frame 213 that light guide plate 201 and reflecting element 207 both sides are made up of extinction material not, it forms the structure of a rectangular recess 213 ' in the face of two medial surfaces system of light guide plate 201 and reflecting element 207.Thus, the light that sends from cold-cathode tube 205 just can enter the extra reflection space that this rectangular recess 213 ' provides by the mode of natural light leak, and after through reflection, can enter the zone in close light inlet corner in the light guide plate 201, produce because insulation sleeve 219 stops and promote this piece " dark space " brightness, backlight module 200 that make to use this side frame 213 just can improve the uniformity coefficient of integral body in light output.
With reference to Fig. 2 B, it is the last skeleton view of light guide plate 201, reflecting element 207, cold-cathode tube 205, insulation sleeve 219, two side frames 213, preceding frame 217 and back of the body frame 215 in the backlight module 200.Can observe by this and learn, formed rectangular recess 213 ' in side frame 213, its horizontal extent system extends to light guide plate 201 (scope is in vertical direction then decided on the thickness and the position of light guide plate 201) from reflecting element 207.The groove arrangement direction system of rectangular recess 213 ' is vertical with the light gasing surface of light guide plate 201, and the formed groove structure of two medial surfaces of facing light guide plate 201 and reflecting element 207 in side frame 213 also not only is confined to the rectangular shape in the present embodiment, other are U type groove, the leg-of-mutton V-type groove of circular arc for example, even other polygonal groove parts can specifically be implemented according to the present invention.
In the present embodiment, backlight module 200 is the light source that adopts the cold-cathode tube form, but the light source that the light source of other patterns for example is made up of a plurality of light-emittingdiode (can carry out the mixed light effect), and the light source formed of organic light emitting diode etc. all can be according to the present invention and concrete enforcement, therefore the present invention does not limit the light source that only is applicable to the fluorescent tube pattern, as long as on light guide plate 201 sides or corner, there is the dark space to produce, all can increase the chance that light enters these dark spaces, and then promote the whole light output uniformity coefficient of backlight module 200 near forming groove structure in the side frame of light guide plate 201 dark spaces.
The structure of dark space, both sides in a kind of compensate for backlight module is provided according to the present invention's second preferred embodiment system, at first with reference to the perspective view shown in Fig. 3 A, the primary structure of backlight module 300 system is identical with the backlight module 200 described in first preferred embodiment, and main system is made up of light guide plate 301, a reflecting plate 303, a cold-cathode tube 305, a reflecting element 307, a prismatic lens 309 of an employing side entering type light source incident mode and blooming piece 311 with other functions.But in the present embodiment, be positioned at the side frame 313 that light guide plate 301 and reflecting element 307 both sides are made up of extinction material not, its two medial surfaces system in the face of light guide plate 301 and reflecting element 307 forms a plurality of V-type grooves 313 ' that are arranged in parallel, and these a plurality of V-type grooves 313 ' are to extend the scope of arranging to light guide plate 301 both sides (scope is in vertical direction then decided according to the thickness of light guide plate 301 and position) from reflecting element 307 in the horizontal direction, the light that cold-cathode tube 305 sends not only makes in can enter the extra reflection space that these a plurality of V-type grooves 313 ' are provided by the mode of natural light leak, and the corner regions that after through reflection, can enter close light inlet in the light guide plate 301, on the other hand, the zone of light guide plate 301 both sides also simultaneously can increase extra reflex space, and the chance that increase light enters light guide plate 301 both sides, make that the overall brightness of backlight module 300 can be average, promote the output quality of this backlight module 300.
With reference to Fig. 3 B, it is the last skeleton view of light guide plate 301, reflecting element 307, cold-cathode tube 305, two side frames 313, preceding frame 317 and back of the body frame 315 in the backlight module 300.Can observe by this and learn, a plurality of V-type grooves 313 ' that are arranged in parallel that form in side frame 313, the orientation of its groove all light gasing surface with light guide plate 301 is vertical, and the formed groove structure of two medial surfaces of facing light guide plate 301 and reflecting element 307 in side frame 313 also not only is confined to the V-type external form in the present embodiment, other are the U type groove of circular arc for example, rectangular recess, even other polygonal grooves also can both be formed the structure of a plurality of grooves of sawtooth like shape, and its number also is not limited to disclosed number in the present embodiment, not only can adjust, and all can specifically implement according to the present invention according to actual needs.
The structure of a kind of compensate for backlight module inner side edge dark space is provided according to the present invention's the 3rd preferred embodiment system, at first with reference to the perspective view shown in Fig. 4 A, the primary structure of backlight module 400 system is identical with the backlight module 200 and 300 described in first and second preferred embodiment, and main system is made up of light guide plate 401, a reflecting plate 403, a cold-cathode tube 405, a reflecting element 407, a prismatic lens 409 of an employing side entering type light source incident mode and blooming piece 411 with other functions.But in the present embodiment, be positioned at the side frame 413 that light guide plate 401 and reflecting element 407 both sides are made up of extinction material not, its two medial surfaces system in the face of light guide plate 401 and reflecting element 407 forms a V-type groove 413 ', and this V-type groove 413 ' is the scope that extends to light guide plate 401 both sides from reflecting element 407, make that not only the light that sends from cold-cathode tube 405 just can enter the extra reflection space that this V-type groove 413 ' is provided by the mode of natural light leak, and the corner regions that after through reflection, can enter close light inlet in the light guide plate 401, the zone of light guide plate 401 both sides also simultaneously can increase extra reflex space simultaneously, and the chance that increase light enters light guide plate 401 both sides, make that the overall brightness of backlight module 400 can be average, promote the output quality of this backlight module 400.
With reference to Fig. 4 B, it is the last skeleton view of light guide plate 401, reflecting element 407, cold-cathode tube 405, insulation sleeve 419, two side frames 413, preceding frame 417 and back of the body frame 415 in the backlight module 400.The V-type groove 413 ' that forms in the side frame 413, maximum different among its groove arrangement direction and above-mentioned first and second embodiment, be exactly its groove arrangement direction be parallel with the light gasing surface of light guide plate 401, meaning is promptly extended along light guide plate 401 both sides, so equally also can increase the chance that light enters light guide plate 401 both sides, and because side frame 413 only forms the structure of groove in vertical direction in the position of light guide plate 401, so can be more firm during in combination with other layer elements and light guide plate 401.On the other hand, in side frame 413, also not only be confined to V-type external form in the present embodiment in the face of the formed groove structure of two medial surfaces of light guide plate 401 and reflecting element 407, other are U type groove, the rectangular recess of circular arc for example, even other polygonal grooves also can both specifically be implemented according to the present invention; And its number also is not limited to and discloses only groove in the present embodiment, and other a plurality of grooves that are arranged in parallel are formed the structure of sawtooth like shape, also all can specifically implement according to the present invention.In addition, with reference to Fig. 4 C, in backlight module 400, all having in the preceding frame 417 of binding with two side frames 413, also can optionally form the groove structure of V-type groove structure 417 ' or other external forms, make that the zone near preceding frame 417 also can increase the chance of light reflection and improve brightness in light guide plate 401.
The structure of a kind of compensate for backlight module inner side edge dark space is provided according to the present invention's the 4th preferred embodiment system, at first with reference to the perspective view shown in Fig. 5 A, backlight module 500 structurally with previous embodiment in the backlight module difference, main system is by the light guide plate 501 of an employing directly-down light source incident mode, be positioned at a plurality of cold-cathode tubes that are arranged in parallel 505 in light guide plate 501 belows, one reflecting element (not shown in the figures, but cold-cathode tube 505 is to place between the light entrance face of this reflecting element and light guide plate 501), one prismatic lens 509 and the blooming piece 511 with other functions are formed.And in the present embodiment, be positioned at the side frame 513 of light guide plate 501 both sides, its two medial surfaces in the face of light guide plate 501 also form a plurality of V-type grooves 513 ' that are arranged in parallel, and be to extend in the horizontal direction from light guide plate 501 both sides, the light that cold-cathode tube 505 sends so not only makes in can enter the extra reflection space that these a plurality of V-type grooves 513 ' are provided by the mode of natural light leak, and making light guide plate 501 increase extra reflex space through entering so-called dark space, light guide plate 501 both sides after reflection and the refraction, just can make that so the integral body output brightness of backlight module 500 can be average, promote the light output quality of this backlight module 500.
With reference to Fig. 5 B, it is the last skeleton view of light guide plate 501, cold-cathode tube 505, insulation sleeve 519, two side frames 513, preceding frame 517 and back of the body frame 515 in the backlight module 500.Can observe by this and learn, a plurality of V-type grooves 513 ' that are arranged in parallel that form in side frame 513, the orientation of its groove all light gasing surface with light guide plate 501 is vertical, and the formed groove structure of two medial surfaces of facing light guide plate 501 in side frame 513 also not only is confined to the V-type external form in the present embodiment, other are the U type groove of circular arc for example, rectangular recess, even other polygonal grooves also can both be formed the structure of a plurality of grooves of sawtooth like shape, and its number also is not limited to disclosed number in the present embodiment, not only can adjust, and all can specifically implement according to the present invention according to actual needs.
Can learn by above-mentioned first to fourth embodiment according to the present invention, the method that is used for dark space brightness in the compensate for backlight module provided by the present invention, at first launch the light entrance face that at least one light source enters light guide plate in the backlight module, and light guide plate can select to adopt the light source incident mode of side entering type or straight-down negative; Light just can export to for example prismatic lens etc. of other optical elements by its light gasing surface via the guiding of light guide plate afterwards; But since light guide plate may be in the side area or the corner location electrode area of light source (for example near) produce the situation of luminance shortage, therefore the present invention just forms the structure of groove at the side frame that is positioned at the light guide plate side, and side frame can be selected to be made up of extinction material not, thus, part light just improves the brightness of so-called dark space in can the reflected back light guide plate and then has promoted the light output uniformity coefficient of whole backlight module after entering the additional light zone of action that this groove structure provides.And the structure of this groove can be U type groove, the rectangular recess of V-type groove, circular arc, even other polygonal grooves, and its formation number also can adjust according to the actual requirements, and the back is concrete implements.
Claims (10)
1. backlight modular structure comprises:
One light guide plate, this light guide plate have a light gasing surface, a light entrance face;
One light source is disposed at by this light entrance face of this light guide plate;
One reflecting element, this reflecting element is disposed at by this light source, makes the part light that this light source produced to import this light entrance face via this reflecting element; And
Two side frames, this two side frames system is disposed at two sides of this light guide plate, and wherein this two side frame has the structure of at least one groove with respect to two medial surfaces of this reflecting element and this light guide plate.
2. backlight modular structure according to claim 1 is characterized in that the shape of this groove comprises rectangle, U type and V-type.
3. backlight modular structure according to claim 1 is characterized in that, the orientation system of this groove is vertical with the light output face of this light guide plate.
4. backlight modular structure according to claim 1 is characterized in that, the orientation system of this groove is parallel with the light output face of this light guide plate.
5. backlight modular structure according to claim 1 is characterized in that, frame and this two side frame were connected before described structure more comprised one, and the medial surface in the face of this light guide plate has the structure of at least one groove in this preceding frame.
6. backlight modular structure according to claim 1 is characterized in that, described backlight module is a side entrance back module.
7. backlight modular structure according to claim 1 is characterized in that, described backlight module is a bottom-lighting type back light module.
8. backlight modular structure according to claim 13 is characterized in that, this light source system is made up of at least one light-emittingdiode and this backlight modular structure can be carried out a mixed light effect.
9. backlight modular structure according to claim 1 is characterized in that, this reflecting element is a hood-shaped structure.
10. backlight modular structure according to claim 1 is characterized in that, this reflecting element is a slab structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100474358A CN100346210C (en) | 2004-05-28 | 2004-05-28 | Structure and method for light background module internal compensated dark space brightness |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100474358A CN100346210C (en) | 2004-05-28 | 2004-05-28 | Structure and method for light background module internal compensated dark space brightness |
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| Publication Number | Publication Date |
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| CN1584699A true CN1584699A (en) | 2005-02-23 |
| CN100346210C CN100346210C (en) | 2007-10-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100426087C (en) * | 2006-01-06 | 2008-10-15 | 清华大学 | Light guide plate and backlight module using same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002203414A (en) * | 2000-12-28 | 2002-07-19 | Optrex Corp | Backlight for liquid crystal display element |
| CN1271459C (en) * | 2002-08-09 | 2006-08-23 | 瀚宇彩晶股份有限公司 | Planar light source device and liquid crystal display device using it as back light module |
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- 2004-05-28 CN CNB2004100474358A patent/CN100346210C/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100426087C (en) * | 2006-01-06 | 2008-10-15 | 清华大学 | Light guide plate and backlight module using same |
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| CN100346210C (en) | 2007-10-31 |
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