CN1987606B - Back light module and liquid crystal display module - Google Patents
Back light module and liquid crystal display module Download PDFInfo
- Publication number
- CN1987606B CN1987606B CN2005101212465A CN200510121246A CN1987606B CN 1987606 B CN1987606 B CN 1987606B CN 2005101212465 A CN2005101212465 A CN 2005101212465A CN 200510121246 A CN200510121246 A CN 200510121246A CN 1987606 B CN1987606 B CN 1987606B
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- guide plate
- light guide
- light
- liquid crystal
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- Light Guides In General And Applications Therefor (AREA)
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Abstract
The backlight module includes stacked up a first light guide plate, and a second light guide plate in sequence. The first light guide plate includes a first bottom face, where there are multiple firstmicrostructures of possessing reflection function. The second light guide plate includes a second bottom face, where there are multiple second microstructures of possessing diffusion function. The backlight module possesses function of switching angular field of coming out light.
Description
[technical field]
The present invention relates to the liquid crystal display module of a kind of module backlight and this module backlight of use.
[background technology]
As everyone knows, the visual angle problem of LCD all is subjected to the extensive concern of industry always.The LCD that not only has wide viewing angle more and more is subjected to market and attractes attention, and the small angle LCD with high brightness, peep-proof also is subjected to market and welcomes.Therefore, switchable viewing angle formula LCD has become one of the developing direction in demonstration field.
At present, usually by adding a liquid crystal panel, and utilize driving circuit to come the switching of this liquid crystal panel pixel cell of control break to realize the switching at visual angle.
Fig. 1 is a kind of structural representation of prior art liquid crystal display module.This liquid crystal display module 1 comprises one first liquid crystal panel 10, one second liquid crystal panel 12 and a module 14 backlight that is cascading from top to bottom.This module 14 backlight provides planar light for these two liquid crystal panels 10,12, and it comprises a light source 141 and a light guide plate 142.This light guide plate 142 comprises an incidence surface 143, an exiting surface 144 adjacent with this incidence surface 143 and one and these exiting surface 144 opposed bottom surface 145.This bottom surface 145 is the coarse planes with diffusion point.This light source 141 is positioned at incidence surface 143 1 sides of this light guide plate 142.
This first liquid crystal panel 10 comprises from top to bottom one first upper substrate 101, one first liquid crystal layer 102 and one first infrabasal plate 103 of stacked setting in regular turn.This first liquid crystal layer 102 has a plurality of pixel cells 104, and each pixel cell 104 arranged.This second liquid crystal panel 12 also comprises from top to bottom one second upper substrate 121, one second liquid crystal layer 122 and one second infrabasal plate 123 of stacked setting in regular turn.
After the light that sends from light source 141 is injected this light guide plate 142 through incidence surface 143, part light is with this second liquid crystal panel 12 of direct directive, another part light a is diffuseed to form light beam b with this bottom surface 145 of directive and spread point, and then this second liquid crystal panel 12 of directive.The scattered beam c that crosses this second liquid crystal panel 12 from all directions transmission is with this first liquid crystal panel 10 of directive.Simultaneously, utilize driving circuit to go to control the odd column of first liquid crystal layer 102 or the opening or closing of even column pixel cell 104 of this first liquid crystal panel 10, then pent pixel cell 104 is owing to the light tight black absorption band 105 that forms.When scattered beam c injected this first liquid crystal layer 102, this light beam c will be divided into three parts: emergence angle was less than or equal to θ
1Light can transmission cross this first liquid crystal panel 10, emergence angle is greater than θ
1And be less than or equal to θ
2Light will be absorbed and be with 105 absorptions, emergence angle is more than or equal to θ
3Light will be reflected back toward this second liquid crystal panel 12, emergence angle is greater than θ
2And less than θ
3Light also transmissive cross first liquid crystal panel 10, wherein, θ
1Be meant eye point and the line of contiguous absorption band 105 neighboring edges and the angle between the normal, θ
2Be meant eye point and the line at contiguous absorption band 105 another edges and the angle between the normal, θ
3Be meant the critical angle of this second substrate 103.Be reflected owing to surpass the light of critical angle, and emergence angle is greater than θ
1And be less than or equal to θ
2Light can be absorbed and be with 105 absorptions, and then the light that causes seeing through this first liquid crystal panel 10 concentrates on a less angle, thereby realizes the small angle display mode of this liquid crystal display module 1.If all open the pixel cell 104 of this first liquid crystal layer 102, then can realize the wide viewing angle display mode of this liquid crystal display module 1.
In sum, as long as utilize driving circuit to go to control the pixel cell 104 that opens and closes this first liquid crystal panel 10, can realize the switching of the wide viewing angle pattern and the small angle pattern of this liquid crystal display module 1.Yet,, therefore increase the cost that this first liquid crystal panel 10 will increase this liquid crystal display module 1 because the cost of liquid crystal panel is higher.In addition,, increase this first liquid crystal panel 10, then can reduce the display brightness of this liquid crystal display module 1 because the light transmittance of liquid crystal panel is lower.
[summary of the invention]
Form this high problem for solving prior art switchable viewing angle scope liquid crystal display mode, be necessary to provide a kind of module backlight of changeable bright dipping angular field of view.
In addition, form this problem of higher, also be necessary to provide the liquid crystal display module of the lower and switchable viewing angle scope of a kind of cost for the liquid crystal display mode that solves prior art switchable viewing angle scope.
A kind of module backlight, it provides planar light for a liquid crystal panel, comprises one first light source, a secondary light source, second light guide plate of one first light guide plate and the stacked setting of this first light guide plate, and first light guide plate is provided with than more close this liquid crystal panel of second light guide plate.This first light guide plate comprises one first bottom surface, one first exiting surface that one first incidence surface is adjacent with this first incidence surface with one and relative with this first bottom surface, contiguous this first incidence surface setting of this first light source, this first bottom surface comprises a plurality of first microstructures with reflection function.This second light guide plate comprises one second bottom surface, second exiting surface that one second incidence surface is adjacent with this second incidence surface with one and relative with this second bottom surface, contiguous this second incidence surface setting of this secondary light source, this second bottom surface comprises a plurality of second microstructures with diffusion function.This first light source and this secondary light source are respectively to this first light guide plate and the second light guide plate incident ray, when only lighting this first light source, if the incident angle of incident ray is more than or equal to the critical angle of this first microstructure, this incident ray generation total reflection phenomenon then, thereby will change into the beam projecting of concentrating to the light of all directions scattering originally, if incident ray is with less than the incident angle incident of this critical angle the time, this incident ray will be refracted and inject next first micro-prism structure and continue reflection and refraction action, till total reflection phenomenon takes place; When only lighting this secondary light source, incident ray is incident to this first bottom surface earlier after this second microstructure scattering, further is divergent after the refraction through this first microstructure again.
A kind of liquid crystal display module, it comprises a liquid crystal panel and a module backlight, and this module backlight provides planar light for this liquid crystal panel, and it comprises one first light source, a secondary light source, and one first light guide plate of stacked setting in regular turn and one second light guide plate.This first light guide plate is provided with than more close this liquid crystal panel of second light guide plate, it comprises one first bottom surface, one first exiting surface that one first incidence surface is adjacent with this first incidence surface with one and relative with this first bottom surface, contiguous this first incidence surface setting of this first light source, this first bottom surface comprises a plurality of first microstructures with reflection function.This second light guide plate comprises one second bottom surface, second exiting surface that one second incidence surface is adjacent with this second incidence surface with one and relative with this second bottom surface, contiguous this second incidence surface setting of this secondary light source, this second bottom surface comprises a plurality of second microstructures with diffusion function.This first light source and this secondary light source are respectively to this first light guide plate and the second light guide plate incident ray, when only lighting this first light source, if the incident angle of incident ray is more than or equal to the critical angle of this first microstructure, this incident ray generation total reflection phenomenon then, thereby will change into the beam projecting of concentrating to the light of all directions scattering originally, if incident ray is with less than the incident angle incident of this critical angle the time, this incident ray will be refracted and inject next first micro-prism structure and continue reflection and refraction action, till total reflection phenomenon takes place; When only lighting this secondary light source, incident ray is incident to this first bottom surface earlier after this second microstructure scattering, further is divergent after the refraction through this first microstructure again.
Compared with prior art, above-mentioned module backlight can utilize and adjust two light guide plate and make the small angle pattern that its light that sends two kinds of angulars field of view can realize showing and the handoff functionality of wide viewing angle pattern.Because the light guide plate cost is lower, so this liquid crystal display module can reach the purpose that reduces cost.
[description of drawings]
Fig. 1 is the structural representation of prior art liquid crystal display module.
Fig. 2 is the structural representation of liquid crystal display module first embodiment of the present invention.
The light path principle synoptic diagram of this module backlight when Fig. 3 is this first light source igniting.
Fig. 4 is the enlarged diagram of IV part among Fig. 3.
Fig. 5 is the light path principle synoptic diagram of this secondary light source this module backlight when lighting.
Fig. 6 is the structural representation of liquid crystal display module second embodiment of the present invention.
[embodiment]
Fig. 2 is the structural representation of liquid crystal display module first embodiment of the present invention.This liquid crystal display module 2 comprises a liquid crystal panel 20 and a module 21 backlight, and this module 21 backlight provides planar light for this liquid crystal panel 20.
This liquid crystal panel 20 comprises one first substrate 201, a liquid crystal layer 202 and one second substrate 203 that is cascading.This module 21 backlight comprises a diffusion sheet 22, one first brightening piece 23, one second brightening piece 24, one first light guide plate 25, one second light guide plate 27 and a reflector plate 29 of stacked setting in regular turn.
This first light guide plate 25 is a clapboard, and it comprises first bottom surfaces 253 that one first incidence surface 251, tilts to link to each other with this first incidence surface 251 with vertical one first exiting surface 252 that links to each other of this first incidence surface 251.These first incidence surface, 251 1 sides also are provided with one first light source 26.This first bottom surface 253 is provided with a plurality of first microstructures 254, and this first microstructure 254 has the total reflection function, is generally " V " shape groove or micro-prism structure, and this first microstructure 254 is close more at a distance of then distribution far away more with this first light source 26.
This second light guide plate 27 also is a clapboard, it comprise one second exiting surface 272 that one second incidence surface 271, tilts to link to each other with this second incidence surface 271, one with these second incidence surface, 271 vertical one second bottom surfaces 273 that link to each other.These second incidence surface, 271 1 sides also are provided with a secondary light source 28.This second bottom surface 273 is provided with a plurality of second microstructures 274, and this second microstructure 274 has diffusion function, is generally lattice point structure or micro-mirror structure, and this second microstructure 274 is close more at a distance of then distribution far away more with this secondary light source 28.
Second exiting surface 272 of first bottom surface 253 of this first light guide plate 25 and this second light guide plate 27 is adjacent and be arranged in parallel, and this first exiting surface 252 is also parallel with this second bottom surface 273.
See also Fig. 3 and Fig. 4, the light path principle synoptic diagram of this module 21 backlight when Fig. 3 lights for this first light source 26, Fig. 4 are the enlarged diagram of IV part among Fig. 3.When lighting this first light source 26 separately, a branch of light is incident upon first microstructure 254 of this first bottom surface 253, because this first microstructure 254 is for having the structure of total reflection function, if the incident angle θ of light d
4More than or equal to the critical angle incident of this first microstructure 254, total reflection phenomenon will take place in this light d so, thereby script is changed the light that becomes than concentrating to the light of all directions scattering; And when incident ray e with less than the incident angle incident of critical angle the time, this light e will be refracted and inject next first microstructure 254 and continue reflection and refraction action, till total reflection phenomenon takes place.As seen, the light beam of this first microstructure 254 scattering originally concentrates on a smaller angle and penetrates, thereby reaches the visual angle demonstration of smaller angle, utilizes the further light harvesting effect of these two brightening pieces 23,24 again, reaches the small angle display mode of high brightness.
The light path principle figure of this module 21 backlight when Fig. 5 lights for this secondary light source 28.When lighting this secondary light source 28 separately, because this second microstructure 274 has diffusion function, when a light f was incident upon this second microstructure 274, this light f will be to all directions scattering, and scattered beam is with first microstructure 254 of this first light guide plate 25 of directive.With two scattered beam g, h is example, because for this first microstructure 254, this light g is different with the incidence point of light h, refraction will take place and form light i in light f in the one side of first microstructure 254, and light h will reflect the formation of outgoing again light j in the one side of other one first microstructure 254, and both emergent ray i, j will disperse more.As seen, after second microstructure, 274 scatterings of the light of these light source 28 outgoing through second light guide plate 27, its scattered beam will further be dispersed by first microstructure 254 of this first light guide plate 25, thereby form a display mode than wide viewing angle certainly.
Lighted these two light sources simultaneously at 26,28 o'clock, and, the display brightness of this liquid crystal display module 2 was improved greatly, reach the display mode of high brightness owing to will superpose from the light of these two light guide plate 25,27 outgoing.
Emulation and detection by experiment, if this liquid crystal display module 2 under the small angle mode of operation, the angular field of view of its horizontal direction is ± 30 °, the angular field of view of vertical direction is ± 35 °; If under the wide viewing angle mode of operation, the angular field of view of its horizontal direction can reach ± 70 °, the angular field of view of vertical direction can reach ± and 65 °.
As seen, this liquid crystal display module 2 utilizes and opens or closes the switching that these two light sources 26,28 can be realized the small angle pattern and the wide viewing angle pattern of this liquid crystal display module 2.Because the light guide plate cost is lower, so this liquid crystal display module 2 can reach the purpose that reduces cost.In addition, light these two light sources simultaneously at 26,28 o'clock, can also realize the display mode of high brightness.
Fig. 6 is the structural representation of second embodiment of the invention liquid crystal display module.The difference of this liquid crystal display module 3 and the first embodiment liquid crystal display module 2 is: these two light guide plate 35,37 are plate shaped light guide plate.
In the respective embodiments described above, wherein any light source can be a light emitting diode.In this LED source, can add more chromaticity coordinates, and then reach the purpose that enlarges liquid crystal display module demonstration colour gamut.
Claims (9)
1. module backlight, it provides planar light for a liquid crystal panel, comprise one first light source and one first light guide plate, this first light guide plate comprises one first bottom surface, one first exiting surface that one first incidence surface is adjacent with this first incidence surface with one and relative with this first bottom surface, contiguous this first incidence surface setting of this first light source, this first bottom surface comprises a plurality of first microstructures with reflection function, it is characterized in that: this module backlight comprises that further a secondary light source reaches and one second light guide plate of the stacked setting of this first light guide plate, and this first light guide plate is provided with than more close this liquid crystal panel of this second light guide plate, this second light guide plate of second light guide plate comprises one second bottom surface, second exiting surface that one second incidence surface is adjacent with this second incidence surface with one and relative with this second bottom surface, contiguous this second incidence surface setting of this secondary light source, this second bottom surface comprises a plurality of second microstructures with diffusion function, this first light source and this secondary light source are respectively to this first light guide plate and the second light guide plate incident ray, when only lighting this first light source, if the incident angle of incident ray is more than or equal to the critical angle of this first microstructure, this incident ray generation total reflection phenomenon then, thereby will change into the beam projecting of concentrating to the light of all directions scattering originally, if incident ray is with less than the incident angle incident of this critical angle the time, this incident ray will be refracted and inject next first micro-prism structure and continue reflection and refraction action, until total reflection phenomenon takes place till, when only lighting this secondary light source, incident ray is incident to this first bottom surface earlier after this second microstructure scattering, further be divergent after the refraction through this first microstructure again.
2. module backlight as claimed in claim 1 is characterized in that: this first microstructure is " V " shape groove or micro-prism structure, and this second microstructure is lattice point structure or micro-mirror structure.
3. module backlight as claimed in claim 1 is characterized in that: this second exiting surface of this second light guide plate is adjacent with this first bottom surface of this first light guide plate and be arranged in parallel.
4. module backlight as claimed in claim 1 is characterized in that: this first light source and secondary light source are light emitting diode.
5. module backlight as claimed in claim 4 is characterized in that: this first microstructure and this second microstructure all are far away more apart with light source, and its distribution is close more.
6. module backlight as claimed in claim 1 is characterized in that: this first light guide plate and this second light guide plate are the wedge shape light guide plate.
7. module backlight as claimed in claim 6 is characterized in that: first bottom surface of this first light guide plate is the inclined-plane of wedge shape, and second bottom surface of this second light guide plate is the opposite face on wedge shape inclined-plane.
8. module backlight as claimed in claim 1 is characterized in that: this first light guide plate and this second light guide plate are plate shaped light guide plate.
9. liquid crystal display module, it comprises a liquid crystal panel and a module backlight, this module backlight is characterized in that for this liquid crystal panel provides planar light: this module backlight is claim 1 to 8 any described module backlight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005101212465A CN1987606B (en) | 2005-12-23 | 2005-12-23 | Back light module and liquid crystal display module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005101212465A CN1987606B (en) | 2005-12-23 | 2005-12-23 | Back light module and liquid crystal display module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1987606A CN1987606A (en) | 2007-06-27 |
| CN1987606B true CN1987606B (en) | 2010-04-07 |
Family
ID=38184458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005101212465A Expired - Fee Related CN1987606B (en) | 2005-12-23 | 2005-12-23 | Back light module and liquid crystal display module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1987606B (en) |
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| US11402692B2 (en) | 2019-05-29 | 2022-08-02 | Coretronic Corporation | Backlight module having an optical film and display apparatus having the same |
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|---|---|
| CN1987606A (en) | 2007-06-27 |
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