TWI383175B - Light-splitting device - Google Patents

Description

Spectroscopic device

The present invention relates to a spectroscopic device, and more particularly to a spectroscopic device comprising a plurality of light-shielding portions and a light-transmitting portion.

In modern display technology, since color is the part that directly affects the user's perception when viewing the display screen, the user's demand for color presentation is increasing, whether it is resolution, contrast or saturation. They are all indicators that are important for the performance of color. In the color rendering, the higher the color saturation, the more vivid the color will be displayed on the display. Therefore, color saturation has always been an important indicator for evaluating the color of the display. In order to display more vivid colors, improving color saturation will be an important goal in the industry.

Therefore, how to design a new spectroscopic device to improve the purity of each color light to further increase the color saturation of the display screen is an urgent problem to be solved in the industry.

It is an object of the present invention to provide a spectroscopic device comprising: a grating plate, a light source, and a visor. The light source emits a light having a wavelength of λ _A ; the grating plate comprises a first diffracting beam splitting element and a second diffracting beam splitting element, and the spacing distance is d, and an incident angle of the light incident on the first diffractive beam splitting element is θ, The exit angle is ψ _A ; the visor includes a light shielding portion A, and the distance between the visor and the grating plate is L; wherein a vertical projection position of the first diffracting beam splitter to the visor is P, and the shading portion A and the vertical projection The distance of position P is D _A and D _A = L. Tan[sin ^-1 (sinθ-mλ _A /d)], m is the diffraction order of the light, and 俾 blocks the light corresponding to the angle ψ _A and the wavelength λ _A .

Another object of the present invention is to provide a spectroscopic device comprising: a grating plate, a light source, and a visor. The light source emits light having a wavelength of λ _B ; the grating plate comprises a first diffracting beam splitting element and a second diffractive beam splitting element, and the spacing distance is d, and the incident angle of the light incident on the first diffractive beam splitting element is θ, and the exit angle is ψ _B ; the visor comprises a light-transmitting portion B, and the distance between the light-transmitting plate and the grating plate is L; wherein the vertical projection position of the first diffracting element to the light-transmitting plate is P, and the light-transmitting portion B is vertical projection The distance of position P is D _B and D _B =L. Tan[sin ^-1 (sinθ-mλ _B /d)], m is the diffraction order of the light, and the light corresponding to the exit angle ψ _B and the wavelength λ _B passes.

Another object of the present invention is to provide a spectroscopic device comprising: a light source, a grating plate, and a visor. The light source emits a first light having a wavelength of λ _A and a second light having a wavelength of λ _B ; the grating plate includes a first diffractive beam splitting element and a second diffractive beam splitting element, and the spacing distance is d, the first light and the second light The incident angle of the light incident on the first diffraction beam splitting element is θ; the light shielding plate comprises the light shielding portion A and the first light transmitting portion B, and the distance between the light shielding plate and the grating plate is L; wherein the first diffraction beam splitting element is to the light shielding plate The vertical projection position is P, the distance from the vertical projection position P to the shading portion A is D _A , and D _A = L. Tan[sin ^-1 (sin θ - mλ _A /d)], the distance from the vertical projection position P to the first light transmitting portion B is D _B , and D _B = L. Tan[sin ^-1 (sin θ - mλ _B /d)], m is the diffraction order of the first ray and the second ray.

The invention has the advantages that the light-shielding portion and the light-transmitting portion of the precision design can be utilized to block the light source of the unnecessary frequency band, thereby achieving the above object.

The object of the present invention, as well as the technical means and embodiments of the present invention, will be apparent to those of ordinary skill in the art.

Fig. 1 is a schematic view showing an embodiment of a spectroscopic device of the present invention. As shown in FIG. 1, the spectroscopic device 1 includes a grating plate 10, a light source 11, and a light shielding plate 12. Please refer to FIG. 2 at the same time, which is a partially enlarged schematic view of the grating plate 10, the light source 11 and the light shielding plate 12. The light source 11 emits a first wavelength λ of the light 110 and the wavelength is λ _A 111 _B of the second light. The light source 11 can be replaced by a cold cathode lamp, a light emitting diode or other light source that emits a broadband spectrum. The grating plate 10 includes a first diffractive beam splitting element 100 and a second diffractive beam splitting element 101; the first diffracting beam splitting element 100 and the second diffractive beam splitting element 101 are generally a crucible or a prismatic structure, and the crucible or prismatic structure thereof The distance between the vertices is d. The first ray 110 and the second ray 111 are incident on the first diffracting element 100 and have an incident angle θ with respect to the vertical direction 103 of the grating plate 10. The light source 110 can further include a lens 112 to adjust the incident angle θ of the first and second light sources. After passing through the first diffractive beam splitting element 100, due to the diffraction effect of the first diffractive beam splitting element 100, an outgoing light having an exit angle different from the incident angle will be produced. Thus, the first ray 110 will have an exit angle ψ _A and the second ray 111 will have an exit angle ψ _B .

The first light ray 110 and the second light ray 111 described in this embodiment are substantially mixed in a mixed color light (for example, white light) before being incident on the first diffraction beam splitting element 100. The first light 110 and the second light 111 having different wavelengths indicate that they are different color lights, and therefore, after passing through the first diffraction beam splitting element, they will be dispersed at different exit angles due to different wavelengths and frequencies. In order to further purify the respective color lights without being disturbed by the components of each other, the light-shielding plates 12 can be used to isolate the color lights to generate relatively independent color lights.

The visor 12 includes a light shielding portion A and a first light transmitting portion B, wherein the light shielding portion A is indicated by black, and the first light transmitting portion B is indicated by white. The visor 12 is disposed in parallel with the grating plate 10 and has a distance L from the grating plate 10. The vertical projection position of the first diffractive beam splitting element 100 to the light shielding plate 12 is P, and the horizontal distance from the vertical projection position P to the light shielding portion A is D _A , which can be expressed by the following formula: D _A = L. Tan[sin ^-1 (sinθ-mλ _A /d)] where m is the diffraction order of the first ray. Then, the light shielding portion A at the distance D _A is disposed to block the first light ray 110 corresponding to the exit angle ψ _A and the wavelength λ _A . On the other hand, if the distance from the vertical projection position P to the light-transmitting portion B is D _B , it can be expressed by the following formula: D _B = L. Tan[sin ^-1 (sinθ-mλ _B /d)].

Similarly, m is the diffraction order of the second light, and the light-transmitting portion B disposed at the distance D _B transmits the second light ray 111 corresponding to the exit angle ψ _B and the wavelength λ _B . Thus, by the light shielding portion is provided at the position of the exit portion of the desired frequency band corresponding to the shutter, to light having a first wavelength λ _A 110 and the second light 111 having the wavelength λ _B disperses.

In a preferred embodiment, the distance L between the visor and the grating plate may be between 9000 micrometers ( μm ) and 1100 micrometers ( μm ), and the distance d may be between 0.9 micrometers ( Between μ m) and 1.1 microns ( μm ). When the distance L is 1000 micrometers ( μm ) and the separation distance d is 1 micrometer ( μm ), the diffraction order m of the first light ray 110 and the second light ray 111 are both 1, and the incident angle θ is 0°. Each of the light shielding portions A is disposed at a distance D _A from the vertical projection position P between 545 micrometers (μm) and 600 micrometers (μm) and between 566 micrometers (μm) and 760 micrometers ( μm ). Light is blocked between 480 nanometers (nm) and 515 nanometers (nm) and between 550 nanometers (nm) and 605 nanometers (nm), respectively.

The first light transmissive portion B is disposed at a distance D _B from the vertical projection position P between 476 micrometers (μm) and 545 micrometers ( μm ), 600 micrometers (μm) and 655 micrometers ( μm ). Between 760 micrometers (μm) and 1246 micrometers ( μm ), enthalpy makes the wavelength range between 430 nm (nm) and 480 nm (nm), 515 nm (nm) and 550, respectively. Light between nanometers (nm) and between 605 nanometers (nm) and 780 nanometers (nm) passes to split light of different wavelengths. With the arrangement of this embodiment, white light can be split into outgoing light of a predetermined three frequency ranges, for example, blue light having a wavelength range between 430 nm (nm) and 480 nm (nm), and a wavelength range between Green light between 515 nanometers (nm) and 550 nanometers (nm) and red light having a wavelength ranging between 605 nanometers (nm) and 780 nanometers (nm). In another embodiment, the visor 12 may further include a second light transmitting portion C, the distance from the vertical projection position P to the second light transmitting portion C is D _C , and the range of D _C is between 0 micrometers (μm) and Between 476 micrometers (μm), light rays of a wavelength corresponding to this range are passed.

When the light source 11 is a light-emitting diode, the frequency band distribution of the outgoing light before the splitting light will be as shown in FIG. 3A. After the processing by the spectroscopic device 1 of the present invention, as shown in Fig. 3B, the emitted light is divided into three frequency ranges. Figure 4A is a chromaticity diagram representing the color saturation of the exiting light NTSC before unsplit, the dotted line is the color coordinate range of the standard NTSC, and the solid line is the color coordinate range of the outgoing light before the splitting. The solid line portion is only 67% of the NTSC color coordinate range for the exiting light system before splitting. After the processing by the spectroscopic device 1 of the present invention, the color coordinate range of the outgoing light will be raised to the solid line portion as shown in Fig. 4B, i.e., the 107% NTSC color coordinate range.

When the light source 11 is a cold cathode lamp, the frequency band distribution of the outgoing light before the splitting will be as shown in Fig. 5A. After the processing by the spectroscopic device 1 of the present invention, as shown in Fig. 5B, the emitted light is divided into three frequency ranges. 6A and 6B further illustrate the color coordinate range of the outgoing light generated by using the cold cathode lamp as a light source, and the ratio of the color coordinate range to the standard NTSC will be increased from 72% to 93%.

The invention has the advantages that the position of the light-shielding portion and the light-transmitting portion of the precision design can be utilized to block the unnecessary light source and further purify the desired color light portion.

Although the present invention has been disclosed above in the preferred embodiments, it is not intended to limit the invention, and any general knowledge of the technical field to which the invention pertains. The scope of the present invention is defined by the scope of the appended claims.

1‧‧‧Splitting device

10‧‧‧Grating plate

100‧‧‧First diffracting element

101‧‧‧second diffracting element

103‧‧‧Vertical direction

11‧‧‧Light source

110‧‧‧First light

111‧‧‧second light

112‧‧‧ lenses

12‧‧ ‧ visor

A‧‧‧ shading section

B‧‧‧First light transmission part

C‧‧‧second light transmission part

P‧‧‧Vertical projection position

1 is a schematic view showing an embodiment of a spectroscopic device of the present invention; FIG. 2 is a partially enlarged schematic view showing an embodiment of the spectroscopic device of the present invention; and FIG. 3A is a view showing an outgoing light of an undivided light when the light emitting diode is used as a light source Schematic diagram of the frequency band distribution; FIG. 3B is a schematic diagram showing the distribution of the outgoing light frequency band after the light splitting device is used as the light source, and FIG. 4A is the light emitting diode as the light source, before the light splitting The chromaticity diagram of the luminescence; FIG. 4B is a chromaticity diagram of the emitted light after being split by the spectroscopic device of the present invention when the illuminating diode is used as the light source; and the outgoing ray of the pre-existing light when the cold cathode lamp is used as the light source in the fifth embodiment. Schematic diagram of distribution; Figure 5B is a schematic diagram showing the distribution of the outgoing light band after splitting by the spectroscopic device of the present invention when the cold cathode lamp is used as the light source; and Fig. 6A is the distribution of the outgoing light band before the splitting of the cold cathode lamp as the light source Fig. 6B is a schematic view showing the distribution of the outgoing light band after splitting by the spectroscopic device of the present invention when the cold cathode lamp is used as the light source.

1‧‧‧Splitting device

10‧‧‧Grating plate

100‧‧‧First diffracting element

101‧‧‧second diffracting element

103‧‧‧Vertical direction

11‧‧‧Light source

110‧‧‧First light

111‧‧‧second light

112‧‧‧ lenses

12‧‧ ‧ visor

A‧‧‧ shading section

B‧‧‧First light transmission part

C‧‧‧second light transmission part

P‧‧‧Vertical projection position

Claims (20)

A light splitting device comprising: a light source emitting a light having a wavelength of λ _A ; a grating plate comprising a first diffracting beam splitting element and a second diffracting beam splitting element, the spacing distance being d, the light An incident angle incident on the first diffractive beam splitting element is θ, and an exit angle is ψ _A ; a visor includes a light shielding portion, and a distance between the visor and the grating plate is L; wherein the first diffractive beam splitting element A vertical projection position to the visor is P, the distance between the opaque portion and the vertical projection position P is D _A , and D _A = L. Tan[sin ^-1 (sinθ-mλ _A /d)], m is the diffraction order of the ray, and 俾 occludes the ray corresponding to the angle ψ _A and the wavelength λ _A . The spectroscopic device of claim 1, wherein the light source is a cold cathode lamp. The spectroscopic device of claim 1, wherein the light source is a light emitting diode. The spectroscopic device of claim 1, wherein the light source further comprises a lens for adjusting the incident angle θ of the light. The spectroscopic device of claim 1, wherein when L is 1000 μm, d is 1 μm, m is 1, and θ is 0 ,, D _A ranges between 545 μm and 600 μm and 566 Between microns and 760 microns, 俾 blocks light between 480 nm and 515 nm and between 550 nm and 605 nm. A light splitting device comprising: a light source emitting a light having a wavelength of λ _B ; a grating plate comprising a first diffracting beam splitting element and a second diffracting beam splitting element, the spacing distance being d, the light An incident angle incident on the first diffractive beam splitting element is θ, and an exit angle is ψ _B ; a visor includes a light transmitting portion, and a distance between the visor and the grating plate is L; wherein the first winding A vertical projection position of the beam splitting element to the visor is P, the distance between the light transmitting portion and the vertical projection position P is D _B , and D _B =L. Tan[sin ^-1 (sin θ - mλ _B /d)], m is the diffraction order of the ray, so that the light corresponding to the exit angle ψ _B and the wavelength λ _B passes. The spectroscopic device of claim 6, wherein the light source is a cold cathode lamp. The spectroscopic device of claim 6, wherein the light source is a light emitting diode. The spectroscopic device of claim 6, wherein the light source further comprises a lens for adjusting the incident angle θ of the light. The spectroscopic device of claim 6, wherein when L is 1000 μm, d is 1 μm, m is 1, and θ is 0 ,, the range of D _B is between 476 μm and 545 μm, 600 Between micron and 655 micron and between 760 micron and 1246 micron, the enthalpy makes the wavelength range between 430 nm and 480 nm, between 515 nm and 550 nm, and between 605 nm and 780 nm. The light between them passes. A light splitting device comprising: a light source emitting a first light and a second light, the first light having a wavelength of λ _A and the second light having a wavelength of λ _B ; and a grating plate comprising a first diffraction split An element and a second diffractive beam splitting element are separated by a distance d, and an incident angle of the first light and the second light incident on the first diffractive beam splitting element is θ, and the first light and the second light The exit angles are ψ _A and ψ _B , respectively; and a visor includes a light shielding portion and a first light transmitting portion, the distance between the visor and the grating plate is L; wherein the first diffracting beam splitting element is A vertical projection position of the visor is P, the distance between the opaque portion and the vertical projection position P is D _A , and D _A = L. Tan[sin ^-1 (sin θ - mλ _A /d)], the distance between the first light transmitting portion and the vertical projection position P is D _B , and D _B = L. Tan[sin ^-1 (sinθ-mλ _B /d)], m is a diffraction order of the first ray and the second ray, and 俾 blocks the first ray corresponding to the exit angle ψ _A and the wavelength λ _A , And passing the second light corresponding to the exit angle ψ _B and the wavelength λ _B . The spectroscopic device of claim 11, wherein the wavelength λ _{A of} the first light has a wavelength ranging between 480 nm and 515 nm or between 550 nm and 605 nm. The spectroscopic device of claim 11, wherein the wavelength λ _{B of} the first light has a wavelength range between 430 nm and 480 nm, between 515 nm and 550 nm or 605 Nai Between rice and 780 nm. The spectroscopic device of claim 11, wherein an incident angle θ of the first light and the second light incident on the first diffracting element is 0 。. The spectroscopic device of claim 11, wherein a distance d between the first diffracting beam splitting element and the second diffractive beam splitting element ranges between 0.9 micrometers and 1.1 micrometers. The spectroscopic device of claim 11, wherein the first light ray and the second light have a diffraction order m of 1. The spectroscopic device of claim 11, wherein a distance L between the visor and the grating plate ranges between 9000 microns and 1100 microns. The spectroscopic device of claim 11, wherein the distance D _A of the vertical projection position P to the light shielding portion ranges between 545 micrometers and 600 micrometers or between 566 micrometers and 760 micrometers. The spectroscopic device of claim 11, wherein the distance D _B of the vertical projection position P to the first light transmitting portion ranges between 476 micrometers and 545 micrometers, between 600 micrometers and 655 micrometers or Between 760 microns and 1246 microns. The spectroscopic device of claim 11, wherein the visor further comprises a second light transmitting portion, the distance from the vertical projection position P to the second light transmitting portion is D _C , and the range of D _C is between Between 0 microns and 476 microns.