CN101368684B - Light splitting apparatus - Google Patents

Light splitting apparatus Download PDF

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Publication number
CN101368684B
CN101368684B CN2008101701728A CN200810170172A CN101368684B CN 101368684 B CN101368684 B CN 101368684B CN 2008101701728 A CN2008101701728 A CN 2008101701728A CN 200810170172 A CN200810170172 A CN 200810170172A CN 101368684 B CN101368684 B CN 101368684B
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China
Prior art keywords
light
microns
dividing device
distance
nanometers
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CN2008101701728A
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Chinese (zh)
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CN101368684A (en
Inventor
王英力
林俊良
徐雅玲
陈建凯
廖烝贤
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AU Optronics Corp
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AU Optronics Corp
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Abstract

Disclosed is a light splitter which comprises a light source, a first light with the emitting wavelength Lambda A and a second light with the wavelength Lambda B, a grating plate includes a first diffraction light-splitting element and a second diffraction light-splitting element; wherein, the interval distance between the two diffraction light-splitting elements is d; the incidence angle emittedinto the first diffraction light-splitting element of the first and the second lights is Theta; a light shield plate includes a shielding part and a light-transmission part; the distance between the light shield plate and the grating plate is L; wherein, the vertical projection position from the first diffraction light-splitting element to the light shield plate is P; the distance between the light shielding part and the vertical projection position P is DA; DA equals to L.tan[sin-1 (sin Theta-m Lambda A/d)]; the distance between the first light-transmission part and the vertical projection position P is DB; DB equals to L.tan[sin-1 (sin Theta-m Lambda B/d)]; wherein, m is the diffraction order of the first light and the second light. The light splitter can utilize the light shielding part and the light-transmission part which are designed preciously in the light splitter to shield the light source in the unneeded frequency bands.

Description

Light-dividing device
Technical field
The present invention relates to a kind of light-dividing device, relate in particular to a kind of light-dividing device that comprises a plurality of shading light parts and light transmission part.
Background technology
In the Display Technique in modern times, because color is the part that the most direct user of influence experiences when watching display screen, therefore the user is more and more higher for the demand that color presents, no matter be resolution, contrast or saturation degree etc., all is to the considerable index of the performance of color.In presenting of color, high more color saturation, the color that display is presented is distinct more, and therefore, color saturation is an important indicator of criticism display color always.In order to show distinct color, promoting color saturation will be the important goal of industry.
Therefore, how designing a new light-dividing device, the purity of coloured light of all kinds is promoted, with the color saturation of further increase display screen, is industry problem anxious to be solved for this reason.
Summary of the invention
The object of the present invention is to provide a kind of light-dividing device, it comprises: original screen panel, light source and shadow shield.Light emitted one wavelength is λ ALight; Original screen panel comprises the first diffraction beam splitter and the second diffraction beam splitter, and its spacing distance is d, and an incidence angle of the light incident first diffraction beam splitter is θ, and an angle of emergence is ψ AShadow shield comprises shading light part A, and the distance between shadow shield and original screen panel is L; Wherein, the first diffraction beam splitter is P to a upright projection position of shadow shield, and the distance of shading light part A and upright projection position P is D A, and D A=L.tan[sin -1(sin θ-m λ A/ d)], m is the diffraction exponent number of light, to block should angle of emergence ψ AAnd wavelength X ALight.
Another object of the present invention is that a kind of light-dividing device is being provided, and it comprises: original screen panel, light source and shadow shield.The light emitted wavelength is λ BLight; Original screen panel comprises the first diffraction beam splitter and the second diffraction beam splitter, and its spacing distance is d, and the incidence angle of the light incident first diffraction beam splitter is θ, and the angle of emergence is ψ BShadow shield comprises light transmission part B, and the distance between light-passing board and original screen panel is L; Wherein, the first diffraction beam splitter is P to the upright projection position of light-passing board, and the distance of light transmission part B and upright projection position P is D B, and D B=L.tan[sin -1(sin θ-m λ B/ d)], m is the diffraction exponent number of light, so that to should angle of emergence ψ BAnd wavelength X BLight pass through.
Another object of the present invention is that a kind of light-dividing device that is used for LCD is being provided, and it comprises: light source, original screen panel and shadow shield.The light emitted wavelength is λ AFirst light and wavelength be λ BSecond light; Original screen panel comprises the first diffraction beam splitter and the second diffraction beam splitter, and its spacing distance is d, and the incidence angle of first light and the second light incident, the first diffraction beam splitter is θ; Shadow shield comprises the shading light part A and the first light transmission part B, and the distance between shadow shield and original screen panel is L; Wherein, the first diffraction beam splitter is P to the upright projection position of shadow shield, and upright projection position P is D to the distance of shading light part A A, and D A=L.tan[sin -1(sin θ-m λ A/ d)], upright projection position P is D to the distance of the first light transmission part B B, and D B=L.tan[sin -1(sin θ-m λ B/ d)], m is the diffraction exponent number of first light and second light.
The invention has the advantages that: can utilize in the light-dividing device, the shading light part and the position, light transmission part of accurate design are blocked the light source of unnecessary frequency range, and are achieved the above object.
Behind the embodiment of consulting accompanying drawing and describing subsequently, any those of ordinary skills just can understand purpose of the present invention, and technological means of the present invention and embodiment.
Description of drawings
Fig. 1 is the schematic diagram of an embodiment of light-dividing device of the present invention;
Fig. 2 is the local enlarged diagram of an embodiment of light-dividing device of the present invention;
Fig. 3 A is when being light source with the light emitting diode, not the schematic diagram of the emergent light frequency range of beam split distribution;
Fig. 3 B is when being light source with the light emitting diode, the schematic diagram that the emergent light frequency range after light-dividing device beam split of the present invention distributes;
Fig. 4 A is when being light source with the light emitting diode, not the emergent light chromatic diagram before the beam split;
Fig. 4 B is when being light source with the light emitting diode, the emergent light chromatic diagram after light-dividing device beam split of the present invention;
When Fig. 5 A is light source with the CCFL, the emergent light frequency range distribution schematic diagram before the beam split not;
Fig. 5 B is when being light source with the CCFL, the emergent light frequency range distribution schematic diagram after light-dividing device beam split of the present invention;
Fig. 6 A is when being light source with the CCFL, not the emergent light frequency range distribution schematic diagram before the beam split;
Fig. 6 B is when being light source with the CCFL, the emergent light frequency range distribution schematic diagram after light-dividing device beam split of the present invention.
Wherein, description of reference numerals is as follows:
1: light-dividing device 10: original screen panel
101: the second diffraction beam splitters of 100: the first diffraction beam splitters
103: vertical direction 11: light source
111: the second light of 110: the first light
112: eyeglass 12: shadow shield
A: shading light part B: first light transmission part
C: the second light transmission part P: upright projection position
The specific embodiment
Fig. 1 is the schematic diagram of an embodiment of light-dividing device of the present invention.As shown in Figure 1, light-dividing device 1 comprises: original screen panel 10, light source 11 and shadow shield 12.Please be simultaneously with reference to Fig. 2, it is the local enlarged diagram of original screen panel 10, light source 11 and shadow shield 12.Light source 11 emission wavelengths are λ A First light 110 be λ with wavelength BSecond light 111.Light source 11 can be CCFL, light emitting diode or other light sources that can send broadband spectral and replaces.Original screen panel 10 comprises the first diffraction beam splitter 100 and the second diffraction beam splitter 101; The first diffraction beam splitter 100 and the second diffraction beam splitter 101 are generally prism or prism structure, and the spacing distance between the summit of its prism or prism structure is d.First light 110 and second light, 111 incidents, the first diffraction beam splitter 100, and the vertical direction 103 of original screen panel 10 accompanies an incidence angle θ relatively.Light source 110 also can comprise eyeglass 112, to adjust the incidence angle θ of first and second light source.Through of the diffraction of the first diffraction beam splitter, 100 backs, the emergent light that firing angle is different from incidence angle will be produced owing to the first diffraction beam splitter 100.Therefore, first light 110 will have an angle of emergence ψ A, and second light 111 has angle of emergence ψ B
First light 110 described in the present embodiment and second light 111 before the incident first diffraction beam splitter 100, are to be mixed among the mixed light (for example white light) in fact.Therefore first light 110 and second light 111 with different wave length represent that promptly it is different coloured light, after through the first diffraction beam splitter, will scatter with the different angles of emergence because of different wavelength and frequency.For coloured light of all kinds can be further purified, and be not subjected to the interference of composition each other, can make by shadow shield 12 and can isolate between coloured light, and produce coloured light more of all kinds.
Shadow shield 12 comprises the shading light part A and the first light transmission part B, and wherein shading light part A represents with black, and the first light transmission part B represents with white.Shadow shield 12 be arranged in parallel with original screen panel 10, and and the distance of 10 of original screen panels be L.The first diffraction beam splitter 100 is P to the upright projection position of shadow shield 12, and upright projection position P is D to the horizontal range of shading light part A A, can following calculating formula represent:
D A＝L.tan[sin -1(sinθ-mλ A/d)] (1)
Wherein m is the diffraction exponent number of first light.Then be arranged on distance D AThe shading light part A at place can block corresponding angle of emergence ψ AAnd wavelength X AFirst light 110.On the other hand, be D as upright projection position P to the distance of light transmission part B B, can following calculating formula represent:
D B＝L.tan[sin -1(sinθ-mλ B/d)]。(2)
Similarly, m is the diffraction exponent number of second light, is arranged on distance D BThe light transmission part B at place can make corresponding angle of emergence ψ BAnd wavelength X B Second light 111 penetrate ejaculation.Therefore, by shading light part being set, wavelength X can will be had in the required corresponding outgoing position of frequency range part of blocking A First light 110 with have wavelength X B Second light 111 carry out beam split.
In a preferred embodiment, the scope apart from L between this shadow shield and this original screen panel can be between 9000 microns (um) and 1100 microns (um), and the scope of spacing distance d can be between 0.9 micron (um) and 1.1 microns (um).When distance L is 1000 microns (um), spacing distance d is 1 micron (um), and first light 110 is 1 with the diffraction exponent number m of this second light 111, and when incidence angle 0 was 0 °, each shading light part A was arranged at and upright projection position P distance D AScope between between 545 microns (um) and 600 microns (um) and between 566 microns (um) and 760 microns (um), to block wave-length coverage respectively between the light that reaches between 480 nanometers (nm) and 515 nanometers (nm) between 550 nanometers (nm) and 605 nanometers (nm).
The first light transmission part B then is arranged at and upright projection position P distance D BScope between between 476 microns (um) and 545 microns (um), between 600 microns (um) and 655 microns (um) and between 760 microns (um) and 1246 microns (um), with the scope that makes wavelength respectively between between 430 nanometers (nm) and 480 nanometers (nm), between 515 nanometers (nm) and 550 nanometers (nm) and the light between 605 nanometers (nm) and 780 nanometers (nm) pass through, carry out beam split with light to different wave length.Setting by present embodiment, can make the white light beam split become the emergent light of predetermined three band limits, for example: wave-length coverage between the blue light between 430 nanometers (nm) and 480 nanometers (nm), wave-length coverage between green glow between 515 nanometers (nm) and 550 nanometers (nm) and wave-length coverage the ruddiness between 605 nanometers (nm) and 780 nanometers (nm).In another embodiment, shadow shield 12 also can comprise the second light transmission part C, and upright projection position P is D to the distance of the second light transmission part C C, and D CScope between 0 micron (um) and 476 microns (um), so that the light of corresponding this scope passes through.
When light source 11 was light emitting diode, the frequency range of the emergent light before the beam split did not distribute, will be as shown in Figure 3A.Through after the processing of light-dividing device 1 of the present invention, will shown in Fig. 3 B, be divided into the emergent light of three band limits.Fig. 4 A is the not chromatic diagram (chromaticity diagram) of the emergent light color saturation NTSC before the beam split of representative, dotted portion is the chromaticity coordinates scope of standard NTSC, solid line partly is the chromaticity coordinates scope of the emergent light before the not beam split, and solid line partly is that the emergent light before the not beam split only has 67% NTSC chromaticity coordinates scope.After the process processing of light-dividing device 1 of the present invention, the chromaticity coordinates scope of emergent light will rise to the solid line part shown in Fig. 4 B, i.e. 107% NTSC chromaticity coordinates scope.
When light source 11 was CCFL, the frequency range of the emergent light before the beam split did not distribute, will be shown in Fig. 5 A.Through after the processing of light-dividing device 1 of the present invention, will shown in Fig. 5 B, be divided into the emergent light of three band limits.Fig. 6 A and Fig. 6 B further illustrate with the chromaticity coordinates scope of CCFL as the emergent light that light source was produced, and the ratio of the chromaticity coordinates scope of itself and standard NTSC will rise to 93% by 72%.
The invention has the advantages that and to utilize in the light-dividing device that unnecessary frequency range light source is blocked in the shading light part and the position, light transmission part of accurate design, is further purified required coloured light part.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; any those of ordinary skills; without departing from the spirit and scope of the present invention; when can making various changes and modification, so protection scope of the present invention is as the criterion when looking the scope that appending claims defines.

Claims (13)

1. light-dividing device that is used for LCD comprises:
One light source is launched one first light and one second light, and the wavelength of this first light is λ A, the wavelength of this second light is λ B
One original screen panel, comprise one first diffraction beam splitter and one second diffraction beam splitter, and its spacing distance is d, and the incidence angle of this first light and this this first diffraction beam splitter of second light incident is θ, and the angle of emergence of this first light and this second light is respectively ψ AAnd ψ BAnd
One shadow shield comprises a shading light part and one first light transmission part, and the distance between this shadow shield and this original screen panel is L;
Wherein, this first diffraction beam splitter is P to a upright projection position of this shadow shield, and the distance of this shading light part and this upright projection position P is D A, and D A=L.tan[sin -1(sin θ-m λ A/ d)], the distance of this first light transmission part and this upright projection position P is D B, and D B=L.tan[sin -1(sin θ-m λ B/ d)], m is the diffraction exponent number of this first light and this second light, to block should angle of emergence ψ AAnd wavelength X AThis first light, and make should angle of emergence ψ BAnd wavelength X BThis second light pass through.
2. the light-dividing device that is used for LCD as claimed in claim 1, the wherein wavelength X of this first light A, its wave-length coverage is between between 480 nanometers and 515 nanometers or between 550 nanometers and 605 nanometers.
3. the light-dividing device that is used for LCD as claimed in claim 1, the wherein wavelength X of this second light B, its wave-length coverage is between between 430 nanometers and 480 nanometers, between 515 nanometers and 550 nanometers or between 605 nanometers and 780 nanometers.
4. the light-dividing device that is used for LCD as claimed in claim 1, wherein the scope of the spacing distance d between this first diffraction beam splitter and this second diffraction beam splitter is between 0.9 micron and 1.1 microns.
5. the light-dividing device that is used for LCD as claimed in claim 1, wherein between this shadow shield and this original screen panel apart from the scope of L between 9000 microns and 1100 microns.
6. the light-dividing device that is used for LCD as claimed in claim 1, wherein this upright projection position P is to the distance D of this shading light part AScope between between 545 microns and 600 microns or between 566 microns and 760 microns.
7. the light-dividing device that is used for LCD as claimed in claim 1, wherein this upright projection position P is to the distance D of this first light transmission part BScope between between 476 microns and 545 microns, between 600 microns and 655 microns or between 760 microns and 1246 microns.
8. the light-dividing device that is used for LCD as claimed in claim 1, wherein shadow shield also comprises one second light transmission part, and this upright projection position P is D to the distance of this second light transmission part C, and D CScope between 0 micron and 476 microns.
9. the light-dividing device that is used for LCD as claimed in claim 1, wherein this light source is a CCFL.
10. the light-dividing device that is used for LCD as claimed in claim 1, wherein this light source is a light emitting diode.
11. the light-dividing device that is used for LCD as claimed in claim 1, wherein this light source also comprises an eyeglass, is used to adjust the incidence angle θ of this first light and this this first diffraction beam splitter of second light incident.
12. the light-dividing device that is used for LCD as claimed in claim 1, wherein the incidence angle θ of this first light and this this first diffraction beam splitter of second light incident is 0 °.
13. the light-dividing device that is used for LCD as claimed in claim 1, wherein the diffraction exponent number m of this first light and this second light is 1.
CN2008101701728A 2008-10-13 2008-10-13 Light splitting apparatus Expired - Fee Related CN101368684B (en)

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CN101368684B true CN101368684B (en) 2010-06-23

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Publication number Priority date Publication date Assignee Title
TWI657264B (en) * 2018-07-19 2019-04-21 香港商印芯科技股份有限公司 Structured light projecting apparatus

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US5218423A (en) * 1991-09-27 1993-06-08 Hughes Aircraft Company Method and apparatus for generating a plurality of radiation beams from incident radiation in a multiple wavelength interferometer
CN1841093A (en) * 2005-03-29 2006-10-04 精碟科技股份有限公司 Prism plate and manufacturing method thereof

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US4497860A (en) * 1978-12-18 1985-02-05 Minnesota Mining And Manufacturing Company Imageable prismatic array
CN1014470B (en) * 1990-07-12 1991-10-23 北京理工大学 Reflective circle changing grating with sawteeth groove
US5218423A (en) * 1991-09-27 1993-06-08 Hughes Aircraft Company Method and apparatus for generating a plurality of radiation beams from incident radiation in a multiple wavelength interferometer
CN1841093A (en) * 2005-03-29 2006-10-04 精碟科技股份有限公司 Prism plate and manufacturing method thereof

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