KR101753958B1 - Wavelength tunable light source apparatus combined with led narrow band filter - Google Patents

Abstract

The present invention discloses a light source device for adjusting the wavelength of emitted light. The apparatus is characterized in that the LED array includes an LED array including a plurality of narrow band LEDs capable of on / off individually and having different emission wavelengths, and a transmission spectrum having a plurality of transmission peaks Modules.

Description

TECHNICAL FIELD [0001] The present invention relates to a wavelength-tunable light source device that combines an LED narrow-band optical filter,

More particularly, the present invention relates to a light source capable of selectively emitting a wavelength in a visible light region or a wide band including ultraviolet light and infrared light.

The light source including the conventional wavelength tuning filter includes a method using a filter including an adjustable birefringent optical element (birefringence adjustment method) and a method using a plurality of rotating filters (a rotating filter method).

First, the birefringence control method is based on a Lyot-Ohman filter (see U.S. Pat. No. 4,394,069).

1 is a view showing the Riot-Oman filter.

Referring to FIG. 1, when two polarizing plates are arranged in parallel or vertically, and a birefringent material is arranged in the direction of 45 degrees to the polarization axis, the optical retardation of the birefringent material depends on the magnitude of optical retardation. The period of the wavelength characteristic of the light is changed. If the optical retardation value of the birefringent layer is adjustable, the wavelength region of the transmitted light can be modulated. It is possible to transmit a light by selecting a desired wavelength band over the entire visible light region by using approximately four or more (usually five) filters having different delay sizes. One of the most widely known methods for controlling the optical delay of a birefringent layer is to use a liquid crystal cell. When a voltage is applied to the liquid crystal cell, the optical delay can be controlled. A technique for fabricating an optical filter in this manner was disclosed in U.S. Patent No. 4,394,069 in 1983, and various detailed techniques thereafter were disclosed. This method has a problem that the characteristic shifts depending on the temperature. This is caused by the general temperature dependent nature of liquid crystals.

Second, there is a method of using a rotating filter. Unlike the birefringence control method, the optical delay axis is rotated without modulating the magnitude of the optical delay. In particular, the principle of controlling the polarization of light passing through the filter is different from the birefringence control method. However, in the method of the rotating filter, more than four filter sets (usually five) are required, and the spectrum of the desired wavelength can be obtained by adjusting the rotation direction of each filter set.

The two methods each include four or more filter sets, which are individually adjusted to select wavelengths. That is, in the birefringence control method, the birefringence value of each liquid crystal cell should be electrically modulated, and in the rotating filter method, the direction of each filter must be precisely controlled. The problems of this adjustment method are as follows.

1. The larger the number of filters is, the more the errors generated in each filter are accumulated and reflected in the transmission wavelength spectrum, so that the error of the peak wavelength of the finally obtained spectrum becomes larger.

2. Leakage light increases in areas other than the selected wavelength due to interference between the filters.

3. The driving method and the adjusting method for adjusting the filter become complicated.

4. Costs for fabricating filters and wavelength tuning light sources increase.

SUMMARY OF THE INVENTION An object of the present invention is to provide a light source capable of easily and continuously controlling wavelengths.

Another object of the present invention is to provide a high-performance, low-cost, and easy-to-adjust wavelength-tunable light source by combining an LED array and a filter module having three or less filter sets.

It is a further object of the present invention to provide a method and apparatus for reducing the number of filters to less than half the number of conventional light sources (for example, a halogen lamp) .

Yet another object of the present invention is to provide a wavelength-tunable light source that is simple to use and has a simple method for adjusting the wavelength.

It is another object of the present invention to provide a wavelength tunable light source which is inexpensive.

According to an aspect of the present invention, there is provided a light source device for controlling a wavelength of emitted light, the LED array including an LED array including a plurality of narrow band LEDs capable of on / off individually and having different emission wavelengths, The spectrum may include a filter module having a plurality of transmission peaks in the wavelength region band to be adjusted.

The filter module may comprise two or three birefringence controlled filters.

The filter module may include two or three rotating filter type filters.

Each LED included in the LED array may have a half-width of 100 nm or less.

And a controller for controlling the LEDs corresponding to the wavelength band to be adjusted to be turned on among the LEDs included in the LED array.

In order to accomplish the above object, the present invention provides a light source device for adjusting the wavelength of emitted light, comprising: an LED array including five or more LEDs having a full width at half maximum of emission wavelength of 80 nm or less and uniformly distributed center peaks; Or a filter module composed of three filter units.

The LED array includes six or more LEDs having a half-width of 50 nm or less, and the filter module may include two filter units.

The filter unit may include a birefringence-controlled filter or a rotating filter.

According to an aspect of the present invention, there is provided a light source device for controlling wavelength of emitted light, including: an LED array including a plurality of narrow band LEDs having different emission wavelengths; a filter for filtering wavelengths of chips emitted from the LED array; Wherein the birefringent film and the birefringent film have a 45 degree angle and the birefringent film and the QWP have a 45 degree angle. And after passing through the three optical components, the light may be configured so that the polarization axis has different linear polarization depending on the wavelength.

According to an aspect of the present invention, there is provided a light source device for controlling wavelength of emitted light, including: an LED array including a plurality of narrow band LEDs having different emission wavelengths; a filter for filtering wavelengths of chips emitted from the LED array; Unit, wherein the filter unit comprises a first polarizer, a birefringent film, a quarter-wave plate (QWP), and a rotatable second polarizer, wherein the polarizer and the birefringent film have a 45 degree angle, And the QWP film have a 45 degree angle. After passing through the first polarizer, the birefringent film, and the QWP and the three optical components, the light has a linearly polarized light beam having a different polarization axis according to the wavelength, So that the wavelength of the light can be modulated.

According to the wavelength-tunable light source device in which the LED narrow-band optical filter of the present invention is combined, the wavelength can be easily and continuously adjusted.

In addition, a combination of an LED array and a filter module having three or less filter sets is superior in performance, cost, and ease of adjustment, and is superior to the conventional filter using a broadband light source (such as a halogen lamp) Can be reduced to less than half, and leakage light can be reduced to improve the quality of the narrowband light source.

Yet another object of the present invention is to provide a wavelength tunable light source that is simple in use and simple and easy to use and has a low cost.

1 shows the Riot-Oman filter,
FIG. 2 illustrates a narrow-band wavelength-tunable light source device using LEDs according to an embodiment of the present invention. FIG.
FIG. 3 is a detailed view showing an LED array of a narrow-band wavelength-tunable light source device using LEDs,
4 shows a birefringence-controlled filter,
5 is a view showing a unit filter set of a rotating filter type,
FIG. 6 shows the components for rotating the rotating filter of the unit filter set shown in FIG. 5,
FIG. 7 is a diagram showing a polarization state of light when passing through the unit filter set shown in FIG. 5;
8 is a view for explaining a mounting method of a QWP filter for connecting two sets of rotation filters,
FIG. 9 illustrates a filter module fabricated by connecting a plurality of filter sets shown in FIG. 6 according to another embodiment of the present invention. FIG.
10 is a view showing a filter module manufactured by connecting a plurality of unit filter sets according to another embodiment of the present invention;
11 is a view showing a filter module formed by connecting various filter sets according to another embodiment of the present invention.
12 is a diagram showing a transmission spectrum according to the number of filters,
13 is a diagram showing a transmission spectrum in an embodiment using six LEDs having a half-width (wavelength width in the middle luminance band) of about 80 nm,
FIG. 14 is a graph showing transmission spectra in the case of using three filters and 80 nm LEDs and two filters and 80 nm LEDs,
Fig. 15 is a diagram showing a transmission spectrum in an embodiment in which an 80 nm full width LED and three and two filter sets are combined to obtain a light source of 450 nm,
16 is a diagram showing a transmission spectrum in an embodiment in which a small peak value is canceled by adjusting the birefringence value of each filter set,
FIG. 17 is a diagram showing a transmission spectrum in an embodiment in which seven LEDs having a half width of about 50 nm are selectively used.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail.

It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In order to facilitate the understanding of the present invention, the same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.

2 is a view illustrating a narrow-band wavelength-tunable light source device using LEDs according to an embodiment of the present invention. 2, the narrow-band wavelength-tunable light source device includes a light source lamp 210 (which may be referred to as an LED array), an optical condenser 220, an adjustable filter unit 230 and a controller 250, . ≪ / RTI > The light source emitted through the wavelength-tunable light source device can be used for a desired purpose through the fiber 240 or the like.

Referring to FIG. 2, the LED array 210 and the adjustable filter 230 are the most important parts of the wavelength-tunable light source device. The LED array 21 may be composed of a plurality of LED lamp groups emitting light of different wavelengths. This will be described in more detail with reference to FIG.

3 is a detailed view showing an LED array of a narrow-band wavelength-tunable light source device using LEDs.

Referring to FIG. 3, the LED array 300 may include a plurality of LED lamps 310-1 to 310-N. Each LED array 300 may include a plurality of LED lamp groups 310-1, 310-2, and 310-3 that emit light of different wavelengths. In order to emit light of different wavelengths, the intensity of the emitted light and the wavelength band of the light can be adjusted through the controller 350 as well as the LED lamp groups 310-1 to 310-N. For example, the LED lamp group 310-1 may have a wavelength of 300 to 500 nm, and the LED lamp group 310-2 may have a wavelength of 500 nm to 700 nm. Accordingly, the plurality of LED lamp groups 310-1 to 310-N can be gathered to control the intensity of light emitted from the LED array 300 and the wavelength band of light.

Each of the LED lamp groups 310-1 to 310-N may include at least one lamp element 320. In response to the adjustment of the wavelength of the LED lamp groups 310-1 to 310-N, the wavelength band of the light of the lamp element 320 included therein can be adjusted. Each of the LED elements 320 may be connected to a switch (SW) to individually perform on / off operations. Control of the switches for on / off operation for each LED element 320 may be performed in the controller 350. [ The controller 350 may be an automatic mode, a control mode for the LED device 320 may be set so that the user may automatically emit light of a desired wavelength according to the encoding mode, or may be directly controlled by the user in the manual mode It is possible.

The LED array 300 can emit a white light source or selectively emit a relatively wide wavelength light. The LED elements 320 used in the LED array 300 have a bandwidth of about 100 nm or less and can be individually turned on / off selectively in a visible light or a wider area. Accordingly, light having a bandwidth of 100 nm level can be selected as the light source for the LED. However, since it is difficult to function as a general wavelength tuning light source with this level of light tuning capability, an adjustable filter for wavelength tuning may be required.

2, the optical condenser 220 can condense the light emitted from the LED array 210 using a condenser lens. The optical condenser 220 may include a plurality of different optical lenses in consideration of the shape of the emitted light.

The adjustable filter unit 230 can secondarily adjust the wavelength of light passing through the optical condenser 220 through the birefringence adjustment method or the rotation filter method. The filter unit 230 can operate by receiving a control signal from the controller 215.

The fiber 240 receives and transmits light whose wavelength band is finally adjusted while passing through the filter unit 230. Fiber 240 may include optical components that carry optical fibers, optical fibers, or other light.

4 is a view showing a birefringence-controlled filter. As shown in FIG. 4, the birefringence-controlled filter according to an exemplary embodiment of the present invention may include a plurality of polarizing plates 410 and filters 420-1 to 420-3.

According to the embodiment of FIG. 4, the birefringence adjustment type filter of the embodiment assumes that the number of the filters 420-1 to 420-3 is three. One filter may include a plurality of substrates, and may include a liquid crystal cell between the substrates. Each liquid crystal cell includes an electrode capable of applying an electric field. The electrodes may be connected to the controller 450 to select whether the filters 420-1 to 420-3 operate. The thickness of the liquid crystal layer is designed differently so that the maximum size of the birefringence may be different for each liquid crystal cell. For example, the filter 1 420-1 may have a birefringence value of 1300 nm, the filter 2 420-2 may have a birefringence value of 2600 nm, and the filter 3 420-3 may have a birefringence value of 5200 nm. The birefringence value of each filter is not necessarily limited to the above value.

5 to 10 show various different embodiments of the adjustable filter of Fig. In particular, Figures 5-11 illustrate an adjustable filter of the rotating filter type.

5 is a view showing a unit filter set of a rotating filter type.

5, a unit filter set (or unit) includes a fixed filter PF1 including a polarizer 1 (P1), a birefringent film B1 and a QWP (Q1) and a polarizer 2 (P2 (P2) may be a rotary filter (RF1)). First, the light passes through the polarizer 1 (P1) and becomes linearly polarized light. And thereafter passes through the birefringent film B1 in which the optical axis is formed in the direction of 45 degrees (or -45 degrees) with the polarization direction of the polarizer. At this time, the optical axis is not necessarily limited to 45 degrees but may be formed in the direction of 40 degrees to 50 degrees.

At this time, the optical retardation value of the birefringent film B1 may have a different value from one filter unit to another. The light passing through the birefringent film (B1) has various polarization states such as linearly polarized light, elliptically polarized light and circularly polarized light depending on the wavelength of light. Then, the QWP film (Q1) is configured to have an optical axis in a direction parallel to the polarization axis of the polarizer.

According to another embodiment of the present invention, the QWP film Q1 may be configured to have an optical axis in a direction perpendicular to the polarization axis of the polarizer. At this time, the QWP film (Q1) means a film having a light delay effect by a quarter of a wavelength in a wide band. When passing through the QWP film (Q1), all of the light is converted into linearly polarized light. However, the polarization axis of the linearly polarized light has a different direction depending on the wavelength.

FIG. 6 is a view showing components for rotating the rotating filter of the unit filter set shown in FIG. 6, the unit filter set a (FS_a) may further include automatic rotation units 610-1 and 610-2 and a driving unit 620 to rotate the rotation filter.

The automatic rotation units 610-1 and 610-2 are disposed at both ends of the rotation filter RF1 and can rotate the rotation filter RF1 through a magnetic force. The automatic rotation units 610-1 and 610-2 may be electromagnet coils. The driving unit 620 may send currents to the automatic rotating units 610-1 and 610-2 to change the automatic rotating units 610-1 and 610-2 to the N-pole or S-pole, respectively. The rotation filter RF1 can rotate in the clockwise or counterclockwise direction by the automatic rotation units 610-1 and 610-2 having N poles and S poles. The degree of transmission of the rotating filter RF1 varies depending on the rotation of the rotating filter RF1 so that the driving signal is adjusted by the driving unit 620 that drives the automatic rotating units 610-1 and 610-2, Can be adjusted.

FIG. 7 is a view showing a polarization state of light when passing through the unit filter set shown in FIG. 5. FIG.

Referring to FIG. 7, the polarization direction after passing through the polarizer 1 (P1) is all the same according to the wavelength. However, after passing through the birefringent film (B1), the polarization direction is all different depending on the wavelength. Up to this stage, the function is the same as that of the conventional Lyot-Ohman filter. However, when passing through the QWP (Q1), all the polarized light is converted into linearly polarized light and the polarization direction is changed.

8 is a view for explaining a mounting method of a QWP filter for connecting two sets of rotating filters. 8, a unit filter set a (FS_a) for connecting various filter sets according to another embodiment of the present invention includes QWP 2 ( Q2 and QWP3 (Q3).

Referring to FIG. 8, the fixed filter PF1 and the rotating filter RF1 are the same as the fixed filter PF1 and the rotating filter RF1 in FIG. At this time, QWP2 (Q2) is attached to the front face of the fixed filter PF1 in the direction of 45 degrees from the polarization axis of the fixed filter PF1 and another QWP3 (Q3) is fixed to the fixed filter RF1 on the rear face of the fixed filter RF1. In the direction of -45 degrees from the polarization axis. At this time, QWP 2 (Q2) may be attached in the direction of -45 degrees, and QWP 3 (Q3) may be attached in the direction of 45 degrees. One should be 45 degrees and the other 45 degrees. The unit filter unit a (FS_a) to which the two QWPs (Q2, Q3) are attached can be simply displayed as shown in the right side of Fig. That is, it can be expressed as Q2 + fixed filter combination (QPF1) and rotating filter + Q3 combination (QRF1). Thus, as shown in Fig. 8, the unit filter unit a (FS_a) made by the method is composed of two linear polarizers, three QWP films, and one birefringent film. Each film may be composed of a sum of a plurality of films. For example, two birefringent films can be attached perpendicularly to each other to form a broadband QWP. However, the optical function is as shown in FIG. In Fig. 8, the rotating filter + Q3 combined body QRF1 is rotatable together. The function of QWP 2 (Q 2) and QWP 3 (Q 3) is to prevent the decrease of the transmittance by rotation of the polarization axis with the next filter even when the rotating filter + Q 3 combination unit (QRF 1) rotates when two or more unit filter units are connected. This is to rotate the filter.

FIG. 9 is a view showing a filter module manufactured by connecting a plurality of filter sets shown in FIG. 8 according to another embodiment of the present invention.

Referring to FIG. 9, the filter module A 900 may include a plurality of unit filter sets FS_a1, FS_a2, FS_a3,... The embodiment of FIG. 9 shows a structure in which three filter units FS_a1, FS_a2, and FS_a3 are continuously connected. At this time, the birefringent films B1, B2, and B3 of the respective filter units have different optical retardations. In this way, a plurality of filter units of four or more can be connected, and each filter can be rotated independently. At this time, narrow band transmitted light can be obtained by matching the wavelengths transmitted by the respective filters.

10 is a view illustrating a filter module manufactured by connecting a plurality of unit filter sets according to another embodiment of the present invention.

Referring to FIG. 10, unlike the filter module A 900 described above, in this method, the filter module B 1000 does not use QWP 2 (Q 2) and QWP 3 (Q 3). The rotary filter portion of the unit filter unit b1 (FS_b1) is removed and the fixed filter PF2 of the unit filter unit b1 (FS_b1) takes charge of the rotary filter. That is, it rotates the fixed filter PF2 with respect to the fixed filter PF1, thereby selecting the transmission wavelength of the filter unit b1 (FS_b1). Likewise, the fixed filter PF3 takes charge of the rotation filter of the second filter unit b2 (FS_b2). Thus, only the last filter unit can be configured to have the rotating filter independently. By doing this, the functions can be made the same and the filter module can be simplified. Each filter unit contains one polarizer, one birefringent film and one QWP film, and the last filter unit b3 (FS_b3) has one more polarizer. However, in the case of the filter module B (1000), the rotation angle is not independent and the rotation angle should be set based on the angle of the immediately preceding filter.

11 is a view showing a filter module formed by connecting various filter sets according to another embodiment of the present invention.

Referring to FIG. 11, in the filter module C, each unit filter unit is composed of a fixed filter (PF1: polarizer + birefringent film + QWP) and a rotatable half wave plate (HWF) Lt; / RTI > At this time, the HWF is configured to have a HWP (Half-wave plate) function in the entire wavelength region and is rotatable. This can be referred to as HRF. The direction of polarization of linearly polarized light passing through PF1 changes with the rotation of HRF. The light of a specific wavelength is transmitted by the polarizer of the next unit filter set. The wavelength region of the transmitted light can be selectively selected using various filter sets. The final unit filter set controls the polarization of transmitted light using a rotating polarizer (RF) instead of HRF.

Here, the QWP and HWP are films having a light retardation effect of a quarter wavelength or a half wavelength in a wide wavelength region. In order to exhibit such a light delay effect, the optical delay value Δn × d (Δn: birefringence, d: film thickness) value has to be linearly increased in wavelength. That is,? N x d /? = 1/4 or 1/2 (?: Wavelength of light). It is not easy to obtain the optical characteristics of the QWP and the HWP described above because the Δn value tends to decrease with the wavelength in a transparent film. In order to realize such optical characteristics, QWP and HWP may be configured to overlap a plurality of optical films to realize such characteristics. Alternatively, QWP and HWP materials can be constructed using materials with reverse wavelength dispersion capabilities.

12 is a diagram showing a transmission spectrum according to the number of filters.

In the first embodiment, approximately five filters are used to obtain a half value (band width at the middle value of the peak) of the average 10 nm level in the visible light region. The spectrum obtained at this time is shown in Fig. 12 (a). The birefringence maximum of each filter was approximately 325 nm, 650 nm, 1300 nm, 2600 nm, and 5200 nm.

When the two filters having a small birefringence are removed, the spectrum shown in FIG. 12 (b) can be obtained. At this time, three peaks appear in the visible region. Therefore, light of a single wavelength can not be obtained.

The spectrum shown in FIG. 12 (c) can be obtained by removing three filters and using only 2600 nm and 5200 nm. Five peaks can be obtained in the visible light region as shown in FIG. 12 (c).

If the number of filters having low birefringence values is reduced, the number of peaks appearing in a certain region increases, so that a single wavelength light source can not be obtained. Therefore, a large number of filter sets are used to obtain a light source of a narrow wavelength. However, as the number of filters increases, the control parameters required to modulate the wavelength become complicated and the error rate increases. In addition, leakage light increases and the wavelength characteristic of the output light is deteriorated.

In the present invention, an LED array is used in order to obtain a high-quality narrow-band wavelength light while reducing the number of filters. That is, instead of a halogen lamp of a wide band, a plurality of LEDs having different wavelengths are used in the light source of FIG.

13 is a diagram showing a transmission spectrum in an embodiment using six LEDs having a half-width (wavelength width in the middle luminance band) of about 80 nm. Referring to FIG. 13, LED 6 in LED 1 is an emission spectrum of LED having a peak value of 420 nm, 470 nm, 520 nm, 570 nm, 620 nm and 670 nm and a half width of about 80 nm.

Fig. 14 is a diagram showing transmission spectra in the case of using three filters and LEDs of 80 nm level, and in an embodiment using two filters and LEDs of 80 nm level. As shown in Fig. 14 (a), even when only three filters are used, a peak of a short wavelength region is not displayed, and a narrowband light source can be obtained. 14 (b), it is also possible to use only two filters.

15 is a diagram showing a transmission spectrum in an embodiment including an 80 nm full width LED and three and two filter sets to obtain a light source of 450 nm. As shown in Fig. 15 (a), when three filters are used, a light source with a narrowband wavelength can be obtained. However, as shown in Fig. 15 (b), when two filters are used, another peak occurs near about 520 nm, and it can be seen that a narrow wavelength can not be obtained. This is because the distance between two peaks in a short wavelength region becomes narrow. Therefore, it is preferable to use three filters in order to obtain a narrow-band light source in the entire visible light region by using an LED having a full width at half maximum of 80 nm. On the other hand, in order to use only two filters, the birefringence value can be adjusted.

16 is a diagram showing a transmission spectrum in an embodiment in which a small peak value is canceled by adjusting the birefringence value of each filter set. This adjustment is easy when the birefringence control method is used. 15 (b), it can be seen that the half value of the outgoing light is slightly increased.

Another method is to use a narrow-band LED whose emission half-width is about 50 nm. FIG. 17 is a diagram showing a transmission spectrum in an embodiment in which seven LEDs having a half width of about 50 nm are selectively used. As shown in FIG. 17, when seven LEDs are selectively used, it can be seen that a narrow-band light source can be obtained by using only two filters.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions as defined by the following claims It will be understood that various modifications and changes may be made thereto without departing from the spirit and scope of the invention.

Claims (10)

A light source device for adjusting a wavelength of emitted light,
An LED array including a plurality of narrow band LEDs capable of on / off individually and having different emission wavelengths; And
With respect to the transmission spectrum, a filter module having a plurality of transmission peaks in a wavelength region band to be adjusted; And
And a controller for controlling the LEDs corresponding to the wavelength band to be adjusted to be turned on among the LEDs included in the LED array,
Wherein at least two of the plurality of transmission peaks of the filter module correspond to a wavelength range of the turned-on LED. The method according to claim 1,
Wherein the filter module comprises two or three birefringence-controlled filters. The method according to claim 1,
Wherein the filter module comprises two or three filters of a rotating filter type. The method according to claim 1,
Wherein each LED included in the LED array has a half-width of 100 nm or less. delete A light source device for adjusting a wavelength of emitted light,
An LED array including five or more LEDs having a half width of an emission wavelength of 80 nm or less and a central peak intensity uniformly distributed in different wavelength bands;
A filter module composed of two or three filter units; And
And a controller for controlling the LEDs corresponding to the wavelength band to be adjusted to be turned on among the LEDs included in the LED array,
Wherein the filter module includes a plurality of filter units and has at least two transmission peaks corresponding to the wavelength range of the turned-on LED. The method according to claim 6,
Wherein the LED array includes at least six LEDs having a half-width of 50 nm or less. 8. The method according to claim 6 or 7,
Wherein the filter unit comprises a birefringence-controlled filter or a rotating filter. A light source device for adjusting a wavelength of emitted light,
An LED array including a plurality of narrow band LEDs having different emission wavelengths;
A filter unit for filtering a wavelength of light emitted from the LED array; And
And a controller for controlling the LEDs corresponding to the wavelength band to be adjusted to be turned on among the LEDs included in the LED array,
A polarizer, a birefringent film, and a quarter-wave plate (QWP)
The polarizer and the birefringent film have an angle of 45 degrees. The birefringent film and the QWP have an angle of 45 degrees. After passing through the polarizer, the birefringent film, and the QWP, light has linear polarization different in polarization axis Respectively,
Wherein the filter unit has a plurality of filter units and has at least two transmission peaks corresponding to the wavelength regions of the turned-on LEDs. A light source device for adjusting a wavelength of emitted light,
An LED array including a plurality of narrow band LEDs having different emission wavelengths;
A filter unit for filtering a wavelength of light emitted from the LED array; And
And a controller for controlling the LEDs corresponding to the wavelength band to be adjusted to be turned on among the LEDs included in the LED array,
A first polarizer, a birefringent film, a quarter-wave plate (QWP), and a rotatable second polarizer,
The first polarizer and the birefringent film have an angle of 45 degrees, the birefringent film and the QWP film have an angle of 45 degrees,
After passing through the first polarizer, the birefringent film, and the QWP, the light has linear polarization different in polarization axis depending on the wavelength,
The second polarizer is configured to be able to modulate the wavelength of light transmitted therethrough,
Wherein the filter unit has a plurality of filter units and has at least two transmission peaks corresponding to the wavelength regions of the turned-on LEDs.

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