CN100498390C - Light conducting board - Google Patents
Light conducting board Download PDFInfo
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- CN100498390C CN100498390C CNB2007101373038A CN200710137303A CN100498390C CN 100498390 C CN100498390 C CN 100498390C CN B2007101373038 A CNB2007101373038 A CN B2007101373038A CN 200710137303 A CN200710137303 A CN 200710137303A CN 100498390 C CN100498390 C CN 100498390C
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- optical waveguide
- waveguide layer
- layer
- guide plate
- incident light
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Abstract
A light conducting plate comprises the first and second optical layer, surface layer, the second light conducting layer formed under the first light conducting layer, with the second layer deflection rate less than the first light conducting deflection rate, and the surface layer formed at the lower surface of the secondary optical layer. It can save reflective plate to reduce overall cost and conforming to thin and light demand.
Description
Technical field
The present invention relates to a kind of light guide plate, the light guide plate in particularly a kind of backlight module.
Background technology
In the display, LCD (liquid crystal display, LCD) (Cathode Ray Tube, CRT) compare and have more advantage with cathode-ray tube (CRT) by display.Therefore, present monitor market strides forward towards the trend of LCD replacement CRT monitor gradually.The light, thin of LCD is important one among its numerous advantages.
Backlight module is one of assembly important among the LCD.Fig. 1 shows the framework of existing backlight module.Be the framework of traditional side entrance back module shown in the figure, it is assembled by following assembly: diffusion sheet A10, adverse prism sheet A20, light guide plate A30, reflector plate A40, framework A50, lamp group A60, carriage A70, screw A80, and grounding assembly A90 etc.Under the framework of this kind backlight module, below light guide plate A30, place a slice reflector plate A40, utilize the light reflection of reflector plate A40 with directive light guide plate A30 bottom surface.That is to say, after light enters light guide plate A30,, light all can be directed to the light guide plate front and bright dipping by the effect of light guide plate A30 and reflector plate A40.Yet the framework of this kind backlight module is comparatively complicated in assembling, and must cooperate reflector plate A40 light could be reflected.So, must have reflector plate A40 in the assembled components of backlight module, thereby cause the cost of this kind backlight module higher.
Summary of the invention
In view of this, the present invention proposes a kind of light guide plate with reflection ray function, can omit reflector plate by this backlight module, and then reduces whole cost.After backlight module removes the part assembly less, more can meet lightening demand.
The present invention proposes a kind of light guide plate, and this light guide plate comprises: first optical waveguide layer, second optical waveguide layer, and superficial layer.Second optical waveguide layer is formed at the lower surface of first optical waveguide layer, and the refractive index of second optical waveguide layer is less than the refractive index of first optical waveguide layer.Superficial layer is formed at the lower surface of second optical waveguide layer, is overflowed by the below of this second optical waveguide layer in order to prevent the incident light that enters this second optical waveguide layer.
The present invention proposes a kind of light guide plate, and this light guide plate and comprises in order to the conduction incident light: first optical waveguide layer, second optical waveguide layer, and superficial layer.First optical waveguide layer has an end face, and incident light enters first optical waveguide layer by end face.Second optical waveguide layer is formed at the below of first optical waveguide layer, and the refractive index of second optical waveguide layer is less than the refractive index of first optical waveguide layer.In the incident light at the interface of first optical waveguide layer and second optical waveguide layer, most of light conducts in first optical waveguide layer because of total reflection, and small part light enters second optical waveguide layer.Superficial layer is formed at the below of second optical waveguide layer, is overflowed by the below of second optical waveguide layer in order to prevent the incident light that enters second optical waveguide layer.
The present invention proposes a kind of light guide plate, and this light guide plate and comprises in order to the conduction incident light: first optical waveguide layer, second optical waveguide layer, and superficial layer.First optical waveguide layer has an end face, and incident light enters first optical waveguide layer by end face.Second optical waveguide layer is formed at the below of first optical waveguide layer, and the refractive index of second optical waveguide layer is less than the refractive index of first optical waveguide layer.Incident light is formed into firing angle with respect to the normal at the interface of first optical waveguide layer and second optical waveguide layer, and when incident angle during greater than critical angle, incident light conducts in first optical waveguide layer because of total reflection.When incident angle was not more than critical angle, incident light entered second optical waveguide layer.Superficial layer is formed at the below of second optical waveguide layer, is overflowed by the below of second optical waveguide layer in order to prevent the incident light that enters second optical waveguide layer.
The present invention proposes a kind of manufacturing method of light conducting board, and this manufacture method comprises the following steps: to form first optical waveguide layer; Form second optical waveguide layer below first optical waveguide layer, wherein the refractive index of second optical waveguide layer is less than the refractive index of first optical waveguide layer; And below second optical waveguide layer, form superficial layer.
Light guide plate according to the present invention has following useful technique effect,, can omit reflector plate that is, and then reduces whole cost, and can meet lightening demand.
Relevant preferred embodiment of the present invention and effect thereof, existing accompanying drawings is as follows.
Description of drawings
Fig. 1 is the framework of existing backlight module.
Fig. 2 is the synoptic diagram of first embodiment of light guide plate of the present invention.
Fig. 3 is the synoptic diagram of second embodiment of light guide plate of the present invention.
Fig. 4 is the synoptic diagram of the 3rd embodiment of light guide plate of the present invention.
Fig. 5 A is that principle of the present invention explains orally synoptic diagram ().
Fig. 5 B is that principle of the present invention explains orally synoptic diagram (two).
Fig. 5 C is that principle of the present invention explains orally synoptic diagram (three).
Fig. 6 is a manufacturing method of light conducting board process flow diagram of the present invention.
Wherein, description of reference numerals is as follows:
A10: diffusion sheet A20: adverse prism sheet A30: light guide plate
A40: reflector plate A50: framework A60: lamp group
A70: carriage A80: screw A90: grounding assembly
n
1, n
2: refractive index θ
1: incident angle θ
2: the refraction angle
θ c: critical angle 1: 10: the first optical waveguide layers of light guide plate
12: end face 14: 20: the second optical waveguide layers of patterning
22: patterning 30: superficial layer 40: incident light
Embodiment
Fig. 2 is the synoptic diagram of first embodiment of light guide plate of the present invention.Light guide plate 1 proposed by the invention is in order to conduction incident light 40, and light guide plate 1 comprises: first optical waveguide layer 10, second optical waveguide layer 20, and superficial layer 30.
First optical waveguide layer 10 has end face 12, and incident light 40 enters first optical waveguide layer 10 by end face 12.Second optical waveguide layer 20 is formed at the below of first optical waveguide layer 10, and the refractive index of second optical waveguide layer 20 is less than the refractive index of first optical waveguide layer 10.As shown in Figure 2, when incident light 40 is injected by the end face 12 of first optical waveguide layer 10, when coming the interface of first optical waveguide layer 10 and second optical waveguide layer 20, wherein most incident light 40 meetings are because of total reflection, and conduction (representing with solid line among the figure) in first optical waveguide layer 10.Relative, 40 of the incident lights of small part enter conduction (being represented by dotted lines among the figure) in second optical waveguide layer 20.
With preferred embodiment, first optical waveguide layer 10 can be formed by polymethylmethacrylate (PMMA), and second optical waveguide layer then can be formed by fluoropolymer (fluorinated polymer).Like this, can reach the refractive index of the refractive index of second optical waveguide layer 20 less than first optical waveguide layer 10.Be noted that: the invention is not restricted to use the material of aforementioned list to form first optical waveguide layer and second optical waveguide layer, as long as the refractive index of second optical waveguide layer 20 is less than the refractive index of first optical waveguide layer 10.Why refractive index as for second optical waveguide layer 20 need will illustrate in greater detail below less than the refractive index of first optical waveguide layer 10.
Fig. 3 is the synoptic diagram of second embodiment of light guide plate of the present invention.In the present embodiment, also comprise pattern (pattern) structure 14 on first optical waveguide layer 10.Layout structure 14 or major function that similar microstructure is set are on first optical waveguide layer 10: the incident light 40 that can will enter first optical waveguide layer 10 reaches the effect of even bright dipping by patterning 14.
Fig. 4 is the synoptic diagram of light guide plate the 3rd embodiment of the present invention.In the present embodiment, patterning 22 is arranged on second optical waveguide layer 20.Similarly, the major function of patterning 22 or similar microstructure is: the incident light 40 that will enter second optical waveguide layer 20 reaches the effect of even bright dipping by patterning 22.
Next the reason of the refractive index need of second optical waveguide layer less than the refractive index of first optical waveguide layer be described.Fig. 5 A is that principle of the present invention explains orally synoptic diagram ().Department is the law of ear law (Snell ' s Law) for the description anaclasis, and this law is: when light incides the interface of different medium, reflection and refraction can take place.The angle of incident light and refract light and interface normal, satisfy following formula:
n
1sinθ
1＝n
2sinθ
2...(1)
N wherein
1And n
2Be respectively the refractive index of two different mediums, just, be respectively the refractive index of first optical waveguide layer 10 and second optical waveguide layer 20, θ
1And θ
2Then be respectively the angle of incident light and refract light and interface normal, be referred to as incident angle and refraction angle.
Fig. 5 B is that principle of the present invention explains orally synoptic diagram (two).According to department is the ear law, when incident light 40 by optically denser medium (medium that refractive index is bigger), for example (refractive index is n to first optical waveguide layer 10
1) inject optically thinner medium (medium that refractive index is less), for example (refractive index is n to second optical waveguide layer 20
2), if incident angle θ
1Equal some angle θ
cThe time, refracted ray can carry out along the tangent line of refracting interface (interface of first optical waveguide layer 10 and second optical waveguide layer 20), i.e. refraction angle θ
2=90 °.This moment sin θ
2=1, (1) then above-mentioned formula, can derive sin θ
1=sin θ
c=n
2/ n
1
Fig. 5 C is that principle of the present invention explains orally synoptic diagram (three).Incident angle θ when incident light 40
1Greater than θ
cThe time, the sinusoidal sin θ of incident angle
1N
2/ n
1, can derive sin θ
21, and such θ
2Be non-existent.So do not exist refract light this moment, and only have reflected light, and so-called total reflection just takes place.The minimum incident angle θ that makes the total reflection generation
cBe referred to as critical angle, and the value of critical angle depends on the ratio of the refractive index of two media, i.e. θ
c=sin
-1(n
2/ n
1).
Via above-mentioned explanation as can be known, the refractive index n of second optical waveguide layer 20 of the present invention
2Refractive index n less than first optical waveguide layer 10
1, and in incident light 40 incident angle of normal formation with respect to the interface of first optical waveguide layer 10 and second optical waveguide layer 20.When the incident angle of incident light 40 during greater than critical angle, incident light 40 can be because total reflection and conduction in first optical waveguide layer 10.Relatively, when the incident angle of incident light 40 during less than critical angle, 40 of incident lights enter conduction in second optical waveguide layer 20.Also because incident light 40 might enter into second optical waveguide layer 20 because of the angular relationship of incident angle, so the following of second optical waveguide layer 20 need form layer of surface layer 30 just now, be used for preventing that the incident light 40 that enters second optical waveguide layer 20 from being overflowed by the below of second optical waveguide layer 20.
By above-mentioned explanation as can be known, because being the minimum a kind of reflecting interface of reflected energy consume, total reflection designs, so embodiments of the invention are integrated in reflection function in the light guide plate, thereby the light guide plate that the embodiment of the invention is proposed is utilized the structure of refractive index collocation and is made light guide plate can reach total reflection, therefore have can reduce assembly (reflector plate that tradition is required), reduce cost, and advantage such as slimming.
Fig. 6 is the process flow diagram of manufacturing method of light conducting board embodiment of the present invention, and this manufacture method comprises the following steps.
Step S10: form first optical waveguide layer, and the step that forms first optical waveguide layer can be selected from modes such as roll extrusion, extrusion or ejaculation.Moreover first optical waveguide layer can be formed by polymethylmethacrylate.
In addition, allow the even effect of bright dipping of incident light that enters first optical waveguide layer, can comprise the following steps: to form patterning at the upper surface of first optical waveguide layer in order to reach.
Step S20: below first optical waveguide layer, form second optical waveguide layer, and the refractive index of second optical waveguide layer is less than the refractive index of first optical waveguide layer.Wherein, the step that forms second optical waveguide layer can be selected from modes such as coating, sputter or sprinkling.Moreover second optical waveguide layer can be formed by fluoropolymer.
In addition, allow the even effect of bright dipping of incident light that enters second optical waveguide layer, can comprise the following steps: equally to form patterning at the upper surface of second optical waveguide layer in order to reach.
Step S30: below second optical waveguide layer, form superficial layer.Wherein, the step of formation superficial layer can be selected from modes such as coating, sputter or sprinkling.Moreover superficial layer can be formed by light reflecting material, is formed with a reflecting surface on it, so can reflect the incident light that enters second optical waveguide layer.Perhaps, superficial layer can be formed by light absorbing material, can absorb the incident light that enters second optical waveguide layer.
Manufacturing method of light conducting board of the present invention, summarizing is as follows:
When making first optical waveguide layer, below first optical waveguide layer, produce second optical waveguide layer lower simultaneously than the first optical waveguide layer refractive index with roll extrusion or extrusion mode, and the layer of surface layer.
After making first optical waveguide layer with roll extrusion or extrusion mode, adopt coating, sputter or spray with post processing mode to form one deck second optical waveguide layer lower than the first optical waveguide layer refractive index.And, adopt coating, sputter or spray with post processing mode equally to form the layer of surface layer.
After making first optical waveguide layer with shoot mode, adopt coating, sputter or spray with post processing mode to form one deck second optical waveguide layer lower than the first optical waveguide layer refractive index.And, adopt coating, sputter or spray with post processing mode equally to form the layer of surface layer.
Though technology contents of the present invention has been carried out aforesaid disclosure with the form of preferred embodiment; yet it is not in order to restriction the present invention; for the ordinary skill in the art; do not breaking away from any change and the retouching of being done under the spirit of the present invention; all should be covered by within the scope of the present invention; therefore, protection scope of the present invention should define with the scope of appending claims.
Claims (13)
1. light guide plate comprises:
One first optical waveguide layer;
One second optical waveguide layer, it is formed at the lower surface of this first optical waveguide layer, and the refractive index of this second optical waveguide layer is less than the refractive index of this first optical waveguide layer; And
One superficial layer, it is formed at the lower surface of this second optical waveguide layer, is overflowed by the below of this second optical waveguide layer in order to prevent the incident light that enters this second optical waveguide layer.
2. light guide plate as claimed in claim 1, wherein this first optical waveguide layer is formed by polymethylmethacrylate.
3. light guide plate as claimed in claim 1, wherein this second optical waveguide layer is formed by fluoropolymer.
4. light guide plate as claimed in claim 1 wherein comprises a patterning on this first optical waveguide layer.
5. light guide plate as claimed in claim 1 wherein comprises a patterning on this second optical waveguide layer.
6. light guide plate as claimed in claim 1, wherein this superficial layer has a reflecting surface, enters an incident light of this second optical waveguide layer in order to reflection.
7. light guide plate as claimed in claim 1, wherein this superficial layer is a shielding layer, enters an incident light of this second optical waveguide layer in order to absorption.
8. light guide plate, in order to conduct an incident light, this light guide plate comprises:
One first optical waveguide layer, it has an end face, and this incident light enters this first optical waveguide layer by this end face;
One second optical waveguide layer, it is formed at the below of this first optical waveguide layer, the refractive index of this second optical waveguide layer is less than the refractive index of this first optical waveguide layer, wherein a part of light in the incident light at the interface of this first optical waveguide layer and this second optical waveguide layer conducts in this first optical waveguide layer because of total reflection, and another part light then enters this second optical waveguide layer; And
One superficial layer, it is formed at the below of this second optical waveguide layer, is overflowed by the below of this second optical waveguide layer in order to prevent the incident light that enters this second optical waveguide layer.
9. light guide plate as claimed in claim 8, wherein this superficial layer has a reflecting surface, enters the incident light of this second optical waveguide layer in order to reflection.
10. light guide plate as claimed in claim 8, wherein this superficial layer is a shielding layer, enters the incident light of this second optical waveguide layer in order to absorption.
11. light guide plate as claimed in claim 8 wherein comprises a patterning on this first optical waveguide layer, in order to even this incident light.
12. light guide plate as claimed in claim 8 wherein comprises a patterning on this second optical waveguide layer, in order to even this incident light.
13. a light guide plate, in order to conduct an incident light, this light guide plate comprises:
One first optical waveguide layer, it has an end face, and this incident light enters this first optical waveguide layer by this end face;
One second optical waveguide layer, it is formed at the below of this first optical waveguide layer, the refractive index of this second optical waveguide layer is less than the refractive index of this first optical waveguide layer, this incident light forms an incident angle with respect to the normal at the interface of this first optical waveguide layer and this second optical waveguide layer, this incident angle during greater than a critical angle this incident light conduct in this first optical waveguide layer because of total reflection, this incident angle during less than this critical angle this incident light enter this second optical waveguide layer; And
One superficial layer, it is formed at the below of this second optical waveguide layer, is overflowed by the below of this second optical waveguide layer in order to prevent the incident light that enters this second optical waveguide layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101373038A CN100498390C (en) | 2007-07-20 | 2007-07-20 | Light conducting board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101373038A CN100498390C (en) | 2007-07-20 | 2007-07-20 | Light conducting board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101086540A CN101086540A (en) | 2007-12-12 |
| CN100498390C true CN100498390C (en) | 2009-06-10 |
Family
ID=38937600
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007101373038A Active CN100498390C (en) | 2007-07-20 | 2007-07-20 | Light conducting board |
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|---|---|
| CN (1) | CN100498390C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9507074B2 (en) | 2014-10-30 | 2016-11-29 | Wistron Corp. | Backlighting module and light guide module both comprising gradient index lens |
| CN107631204A (en) * | 2016-07-18 | 2018-01-26 | 恒颢科技股份有限公司 | Light source module and display device |
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| CN102073092A (en) * | 2011-03-03 | 2011-05-25 | 上海向隆电子科技有限公司 | Light guide plate, illuminating device and method for manufacturing light guide plate |
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| TW201321808A (en) * | 2011-11-16 | 2013-06-01 | Young Lighting Technology Inc | Light guide plate module and fabrication method thereof, and light source device |
| CN102809105B (en) * | 2012-08-22 | 2015-08-19 | 京东方科技集团股份有限公司 | Backlight module and display unit |
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| CN108196336B (en) | 2018-01-02 | 2020-06-30 | 京东方科技集团股份有限公司 | Light guide plate, backlight module and display device |
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| CN108897092B (en) * | 2018-09-03 | 2020-06-02 | 合肥京东方光电科技有限公司 | Light guide structure, manufacturing method thereof, light source assembly and display device |
-
2007
- 2007-07-20 CN CNB2007101373038A patent/CN100498390C/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9507074B2 (en) | 2014-10-30 | 2016-11-29 | Wistron Corp. | Backlighting module and light guide module both comprising gradient index lens |
| CN107631204A (en) * | 2016-07-18 | 2018-01-26 | 恒颢科技股份有限公司 | Light source module and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101086540A (en) | 2007-12-12 |
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