TWI796057B - Phototherapy device and display device - Google Patents

Abstract

A light source device includes: a first light source that generates a first light beam in a first time period of a first period; and a second light source that generates a second light beam in a second time period of the first period. The first light beam and the second light beam have the same color temperature, and the first light beam and the second light beam are emitted alternately in the first period, and the color rendering index of the mixed light of the first light beam and the second light beam is greater than or equal to 85.

Description

Light source device and display device

The present invention relates to a light source device and a display device, in particular to a light source device or a display device for giving visual stimulation with a fixed cycle/frequency.

Patients with Alzheimer's disease (Altzheimer's Disease) account for about 60-80% of the total dementia patients. The pathological features of Alzheimer's disease include the accumulation of abnormal proteins, such as amyloid plaques produced by β-amyloid between neurons, and abnormal accumulation of tau protein in cells. The formation of neurofibrillary tangles (tangles). Amyloid plaques can interfere with the signaling from cell-to-cell synapses, and neurofibrillary tangles can prevent nutrients from being transported through cells, leading to cell death. Generally speaking, when the colloidal lymphatic fluid in the human body, such as microglia and astrocytes, is functioning normally, the cerebrospinal fluid (CSF) can take away the accumulated abnormal proteins and send them to the liver Metabolize these abnormal proteins. But when the colloidal lymph fluid is not working properly, the abnormal protein accumulates in the brain cells and cannot be removed, and finally causes neurodegeneration to form Alzheimer's disease, resulting in dementia.

The current non-invasive stimulation signal for the treatment of Alzheimer's disease uses sound and light stimulation to induce gamma brain waves to activate microglial cells, thereby removing abnormal protein accumulation, and alleviating cognitive decline. However, the current sound and light stimulation signals are extremely monotonous, and long-term viewing or listening can easily cause fatigue or discomfort, and it is difficult to affect the user's willingness to use them for a long time.

The present invention provides a light source device for treating or alleviating diseases by giving visual stimulation of a specific cycle/frequency.

According to some embodiments of the present invention, there is provided a light source device, comprising: a first light source that provides a first light beam during a first period of a first cycle; and a second light source that provides a light beam during a first period of the first cycle A second light beam is provided in a second period, wherein the first light beam and the second light beam are emitted alternately in the first period, and the color rendering value of the mixed light of the first light beam and the second light beam is Greater than or equal to 85.

According to some other embodiments of the present invention, a display device is provided, including a light source device, and the light source device includes: a first light source that provides a first light beam during a first period of a first cycle; and a second light source , providing a second light beam during the second period of the first cycle, wherein the first light beam and the second light beam alternately emerge in the first cycle, the first light beam and the second light beam The color rendering value of the mixed light of the beam is greater than or equal to 85.

According to some embodiments of the present invention, there is provided a light source device, comprising: a first light source that provides a first light beam during a first period of a first cycle; and a second light source that provides a light beam during a first period of the first cycle A second light beam is provided in a second period, wherein the first light beam and the second light beam are emitted alternately in the first period, and the first light beam and the second light beam have the same color temperature.

Based on the above, the present invention provides a light source device and a display device, by providing a light cycle of at least two different light combinations, giving visual stimulation with a fixed cycle/frequency to treat Alzheimer's disease, and using a more comfortable combination of light stimulation , to overcome the problems of the existing non-invasive stimulation signals being boring and difficult to perform for a long time, and to apply it to the lighting and display of daily life.

Please refer to the following examples and accompanying drawings for a more complete understanding of the present invention, however, the present invention may be practiced in many different forms and should not be construed as being limited to the examples described herein. In the drawings, for the sake of clarity, the components and their relative dimensions may not be drawn to scale.

Fig. 1 is a schematic diagram of a light source device according to some embodiments of the present invention. FIG. 2 is a timing diagram of optical signals according to some embodiments of the present invention. Please refer to Figure 1 and Figure 2 at the same time. As shown in FIG. 1 , the light source device 100 includes: a first light source 110 and a second light source 120 . According to some embodiments, the first light source 110 and the second light source 120 are arrayed light emitting diodes, or other elements capable of emitting light beams, and the present invention is not limited thereto. Wherein, the first light source 110 is used to provide the first light beam L1, and the second light source 120 is used to provide the second light beam L2, and the first light beam L1 and the second light beam L2 are configured to emit alternately to provide light stimulation. As shown in FIG. 2 , the first light source 110 is configured to provide the first light beam 201 in the first period T11 of the first period T1, and the second light source 120 is configured to provide the first light beam 201 in the second period T12 of the first period T1. Two light beams 202 . Wherein, the first period T11 and the second period T12 constitute a first period T1, and the first light beam 201 and the second light beam 202 are emitted alternately within the first period T1. According to some embodiments, the first frequency f1 corresponding to the first period T1 is 35-45 Hz, that is, f1=1/T1=35-45 Hz. According to some embodiments, the first frequency f1 corresponding to the first period T1 is 40 Hz, but the invention is not limited thereto. In this embodiment, the duration of the first period T11 is equal to the duration of the second period T12, that is, the first light beam 201 and the second light beam 202 have the same duty cycle, ie T11/T1=T12/T1. In another embodiment, the first light beam 201 and the second light beam 202 may have different duty cycles.

In this embodiment, the first light beam 201 in the first time period T11 and the second light beam 202 in the second time period T12 are respectively continuous light beams. According to some embodiments, the light wavelengths of the first light beam 201 and the second light beam 202 are between 380-1050 nm, and the present invention is not limited thereto. According to some embodiments, the first light beam 201 and the second light beam 202 are monochromatic light, or mixed light including multiple monochromatic lights, or full-spectrum light, but not limited thereto.

In this embodiment, the first light beam 201 and the second light beam 202 have the same color temperature and the same spectrum. According to some embodiments, the color temperature of the first light beam 201 and the second light beam 202 is between 2000-7000K, but not limited thereto. According to some embodiments, the difference between the first light beam 201 and the second light beam 202 is that the first light beam 201 and the second light beam 202 have different light intensities, that is, the light intensity of the first light beam 201 may be greater or less than that of the second light beam 202 brightness.

。根據一些實施例，第一光束201與第二光束202的光強度差異D小於10%。在一些實施例中，第一光束201與第二光束202的光強度差異D小於5%。在一些實施例中，第一光束201與第二光束202的光強度差異D小於2.5%。 In this embodiment, the light intensity difference between the first light beam 201 and the second light beam 202 is smaller than a threshold. If the light intensity of the first light beam 201 is I1, and the light intensity of the second light beam 202 is I2, then the light intensity difference D is defined as

. According to some embodiments, the light intensity difference D between the first light beam 201 and the second light beam 202 is less than 10%. In some embodiments, the light intensity difference D between the first light beam 201 and the second light beam 202 is less than 5%. In some embodiments, the light intensity difference D between the first light beam 201 and the second light beam 202 is less than 2.5%.

When the first light beam 201 and the second light beam 202 sequentially emit light in the first period T1, since the color temperature and spectrum of the first light beam 201 and the second light beam 202 are the same, but only have differences in light intensity, therefore, the light source device 100 The emitted first light beam 201 and second light beam 202 will flash with different light intensities but the same first frequency f1 to provide light stimulation, and the light mixed by the first light beam 201 and the second light beam 202 has a high color rendering value (color rendering index, CRI), that is, CRI≧85. Since the light intensity difference between the first light beam 201 and the second light beam 202 is only less than the threshold value, for example, the light intensity of the first light beam 201 and the second light beam 202 is less than 10% or less, so for the patient to be treated, the The received light intensity changes relatively little, reducing the burden on the patient's eyes. By changing the irradiation period of the first light beam 201 and the second light beam 202 emitted by the first light source 110 and the second light source 120 in the light source device 100, the light stimulation received by the patient can be adjusted, thereby generating induced gamma brain waves, activating The effect of microglia. In the subsequent embodiments, various implementation modes will be described successively.

FIG. 3 is a timing diagram of optical signals according to some embodiments of the present invention. The light signal timing diagram shown in FIG. 3 is similar to that in FIG. 2. The first light source 110 provides the first light beam 301 in the first period T11 of the first period T1, and the second light source 120 is configured to provide the first light beam 301 in the second period T1 of the first period T1. The second light beam 302 is provided during the period T12. The light intensity difference between the first light beam 301 and the second light beam 302 is less than a threshold, for example less than 10% or less.

The difference between FIG. 3 and FIG. 2 is that the first light beam 301 and the second light beam 302 have the same color temperature, but the second light beam 302 has a different spectrum from the first light beam 301 . That is to say, the first light beam 301 and the second light beam 302 have different wavelength components, and the first light beam 301 and the second light beam 302 are illuminated alternately in the first period T1. In another embodiment, the first light beam 301 and the second light beam 302 are mixed into light with high color rendering value (for example, CRI≧85) to provide visual stimulation to the patient to induce gamma brain waves. Since the first light beam 301 and the second light beam 302 have the same color temperature and different spectra, the first light beam 301 and the second light beam 302 may have different light intensities for different purposes. In some embodiments, if the light source device 100 is used as a display, the first light beam 301 and the second light beam 302 may have the same light intensity, so as to prevent the user from viewing images with changing brightness and darkness. In other embodiments, if the light source device 100 is used for providing illumination, the first light beam 301 and the second light beam 302 may have different light intensities, and the light intensity difference is less than a threshold value, such as less than 10% or less, In order to enable the user to receive light stimulation with brightness changes.

FIG. 4 is a timing diagram of optical signals according to some embodiments of the invention. The light signal timing diagram shown in FIG. 4 is similar to FIG. 2, the first light source 110 provides the first light beam 401 in the first period T11 of the first period T1, and the second light source 120 is configured to provide the first light beam 401 in the second period T1 of the first period T1. The second light beam 402 is provided during the period T12. The light intensity difference between the first light beam 401 and the second light beam 402 is less than a threshold, for example less than 10% or less. In addition, the first light beam 401 and the second light beam 402 have the same color temperature and the same spectrum. In other embodiments, the first light beam 401 and the second light beam 402 have the same color temperature and different spectra.

The difference between FIG. 4 and FIG. 2 is that one of the first light beam 401 and the second light beam 402 is a continuous light beam, and the other is a flickering light beam with a flicker frequency, also known as pulse width modulation (pulse width modulation, PWM) beam. In this embodiment, the first beam 401 is a continuous beam in the first period T11, the second beam 402 is a flashing beam with a blinking frequency in the second period T12, and the first beam 401 and the second beam 402 are mixed into light with high color rendering value (CRI≧85). In some other embodiments, the second light beam 402 is a continuous light beam during the second period T12, and the first light beam 401 is a flickering light beam with a flickering frequency during the first time period T11, the present invention is not limited thereto. According to some embodiments, the flicker frequency range of the second light beam 402 in the second period T12 is >500 Hz, preferably 500-2000 Hz, but not limited thereto. In this embodiment, the duration of the first period T11 is equal to the duration of the second period T22, and the sum of the duration of the first period T11 and the duration of the second period T12 is equal to the duration of the second cycle, that is, the first The period T11 and the second period T12 respectively account for 50% of the first period T1. In another embodiment, the first period T11 or the second period T12 may account for 40-60% of the first period T1, but not limited thereto. When the flickering frequency of the second light beam 402 is in the range of 500-2000 Hz, this frequency has exceeded the recognition frequency of human eyes. Therefore, although the second light beam 402 is a flickering light beam, the patient cannot easily perceive the flickering of the light beam. In this embodiment, the first light beam 401 generated by the light source device 100 in the first period T11 in the first period T1 can provide continuous light stimulation of the light, while the light stimulation generated by the light source device 100 in the second period T12 in the first period T1 A light stimulus of a blinking beam may be provided in the generated second light beam 402 .

FIG. 5 is a timing diagram of optical signals according to some embodiments of the present invention. The light signal timing diagram shown in FIG. 5 is similar to that in FIG. 4. The first light source 110 provides the first light beam 501 in the first period T11 of the first period T1, and the second light source 120 is configured to provide the first light beam 501 in the second period T1 of the first period T1. The second light beam 502 is provided during the period T12. Wherein, the first light beam 501 and the second light beam 502 have different light intensities, and the difference in light intensity is less than a threshold value, such as less than 10% or less. In addition, the first light beam 501 and the second light beam 502 have the same color temperature and the same spectrum and mix light with high color rendering value (CRI≧85).

The difference between FIG. 5 and FIG. 4 is that the first light beam 501 in the first period T11 and the second light beam 502 in the second period T12 are both flickering light beams with a flicker frequency, the first light beam 501 has a first flicker frequency, and the second light beam 502 has a flicker frequency. Light beam 502 has a second blinking frequency. In one embodiment, the first blinking frequency of the first beam 501 is different from the second blinking frequency of the second beam 502 . In another embodiment, the first blinking frequency of the first light beam 501 is the same as the second blinking frequency of the second light beam 502 , but the invention is not limited thereto. According to some embodiments, the flickering frequencies of the first light beam 501 and the second light beam 502 range from >1000 Hz, preferably 1000-2000 Hz, but not limited thereto. According to some embodiments, the first beam 501 and the second beam 502 may have the same duty cycle, or may have different duty cycles. According to some embodiments, the duty cycle of the first light beam 501 and the second light beam 502 is 40-60%, preferably 50%, but not limited thereto. In this embodiment, both the first light beam 501 provided by the light source device 100 in the first period T11 in the first period T1 and the second light beam 502 provided in the second period T12 in the first period T1 can provide The stimulation of flashing light beams.

FIG. 6 is a timing diagram of optical signals according to some embodiments of the present invention. The light signal timing diagram shown in FIG. 5 is similar to that in FIG. 6. The first light source 110 provides the first light beam 601 in the first period T11 of the first period T1, and the second light source 120 is configured to provide the first light beam 601 in the second period T1 of the first period T1. The second light beam 602 is provided during the period T12. The light intensity difference between the first light beam 601 and the second light beam 602 is less than a threshold, for example less than 10% or less.

The difference between FIG. 6 and FIG. 5 lies in that the first light beam 601 and the second light beam 602 have the same color temperature but different spectra. Therefore, in this embodiment, the light beam provided by the light source device 100 in the first period T1 will generate light beams with the same color temperature and different spectra in the first period T1, and alternately output and mix them to produce light with high color rendering value (CRI≧85). light to provide visual stimulation to the patient. Since the first light beam 601 and the second light beam 602 have the same color temperature and different spectra, the first light beam 601 and the second light beam 602 may have different light intensities for different purposes. In some embodiments, if the light source device 100 is used as a display, the first light beam 601 and the second light beam 602 may have the same light intensity, so as to prevent the user from viewing a picture with changing brightness and darkness. In some other embodiments, if the light source device 100 is used for providing illumination, the first light beam 601 and the second light beam 602 may have different light intensities, and the light intensity difference is less than a threshold value, such as less than 10% or less, In order to enable the user to receive light stimulation with brightness changes.

2 to 6, one of the first light beam 201, 301, 401, 501, 601 and the second light beam 202, 302, 402, 502, 602 may be white light or Equal-energy white light, or a continuous spectrum within a range of wavelengths. According to some embodiments, isoenergetic white light may be within a given wavelength range, each wavelength having the same energy, for example, within the range of 400-800 nm, all wavelengths having the same energy. According to some embodiments, there is a continuous spectrum in a wavelength range, and within a given wavelength range, the energy carried by each wavelength may be different, for example, in the range of 400-800 nm, all wavelengths have different energy.

FIG. 7 is a timing diagram of acousto-optic signals according to some embodiments of the present invention. Please refer to Figure 1 and Figure 7 at the same time. According to some embodiments, the light source device 100 further includes a sound source 150 for generating a sound wave pulse S, and the emission period of the sound wave pulse S is the same as the first period T1. As shown in FIG. 7, in the first period T11 in the first period T1, the first light source 110 emits the first light beam 701, and in the second period T12 in the first period T1, the second light source 120 emits the first light beam 701. Two light beams 702 . The first light beam 701 and the second light beam 702 here can be various embodiments described in FIG. 2 to FIG. 6 , so details are not repeated here. The first light beam 701 and the second light beam 702 may also be combined in other embodiments mentioned below, and is not limited thereto. On the other hand, in the first period T1, the sound source 150 emits a sound wave pulse 703 with a width W. According to some embodiments, the acoustic pulse 703 may be anywhere in the first period T1, for example in the first period T11, or in the second period T12, or partly in the first period T11 and partly in In the second time period T12. According to some embodiments, the time length of the sound wave pulse 703 is less than the first period T1, preferably 0.1-0.25T1, and the present disclosure is not limited thereto. Therefore, in the first period T1, not only the optical stimulus of the first light beam 701 and the second light beam 702, but also the sound stimulus produced by the sound wave pulse 703 emitted by the sound source. Therefore, in the first period T1, the light source device 100 can provide sound and light stimulation at the same time, so as to strengthen the stimulation to the user's brain.

8A to 8C are timing diagrams of optical signals according to some embodiments of the present invention. Please refer to FIG. 1 and FIGS. 8A to 8C at the same time. The light signal timing diagram shown in FIG. 8A is similar to FIG. 2, the first light source 110 provides the first light beam 801 in the first period T11 of the first period T1, and the second light source 120 is configured to provide the first light beam 801 in the second period T1 of the first period T1. The second light beam 802 is provided during the time period T12. The first beam 801 and the second beam 802 have different light intensities, and the difference between the two light intensities is less than a threshold, such as less than 10% or less.

As shown in FIG. 1 , the light source device 100 further includes a third light source 130 and a fourth light source 140 . The third light source 130 is used for providing the third light beam L3, and the fourth light source is used for providing the fourth light beam L4. The third light source 130 and the fourth light source 140 are similar to the first light source 110 and the second light source 120, and are configured to alternately emit light beams to generate photostimulation, and at least one of the light beams (L1+L2 or L3+L4) can be mixed to produce Light with high color rendering value (CRI≧85). According to some embodiments, the third light beam L3 and the fourth light beam L4 may have different light intensities, and the light intensity difference is less than a threshold, such as less than 10% or less. According to some embodiments, the third light source 130 and the fourth light source 140 are arrayed light emitting diodes, or other elements capable of emitting similar light beams, and the present invention is not limited thereto. As shown in FIG. 8B , the third light source 130 is configured to provide a third light beam 803 in a third period T21 of the second period T2. The fourth light source 140 is configured to provide the fourth light beam 804 in the fourth period T22 of the second period T2, and the third light beam 803 and the fourth light beam 804 are emitted alternately in the second period T2. In this embodiment, the duration of the third period T21 is equal to the duration of the fourth period T22, and the sum of the duration of the third period T21 and the duration of the fourth period T22 is equal to the duration of the second cycle, that is, the third The period T21 and the fourth period T22 respectively account for 50% of the second period T2. According to some embodiments, the second frequency f2 corresponding to the second period T2 may be different from the first frequency f1 corresponding to the first period T1. According to some embodiments, the second frequency f2 corresponding to the second period T2 is 55-65 Hz, that is, f2=1/T2=55-65 Hz, as shown in FIG. 8C . According to some embodiments, the second frequency f2 corresponding to the second period T2 is 60 Hz, and the present invention is not limited thereto. According to some embodiments, the duration of the third period T21 and the duration of the fourth period T22 may be equal or unequal, and the invention is not limited thereto.

In this embodiment, the first light beam 801 and the second light beam 802 can be various embodiments described in FIGS. 2 to 6 , combined with other embodiments mentioned below, and are not limited thereto. Therefore, it will not be repeated here. The third light beam 803 and the fourth light beam 804 here can be various embodiments described in FIGS. 2 to 6 , combined with other embodiments mentioned below, and are not limited thereto. In some embodiments, the first light beam 801 and the second light beam 802 have the same first color temperature, and the mixed light of the first light beam 801 and the second light beam 802 has a high color rendering value (CRI≧85), the third light beam 803 and The fourth light beam 804 has the same second color temperature, and the mixed light of the third light beam 803 and the fourth light beam 804 has a high color rendering value (CRI≧85). In some other embodiments, the mixed light of the first light beam 801 and the second light beam 802 has a high color rendering value (such as CRI≧85), but the light mixing of the third light beam 803 and the fourth light beam 804 may not have a high color rendering value (such as CRI<85). According to some embodiments, the first color temperature and the second color temperature may be the same or different, and the invention is not limited thereto. According to some embodiments, when the first color temperature is the same as the second color temperature, the spectra of the first light beam 801 , the second light beam 802 , the third light beam 803 and the fourth light beam 804 are all different.

When the light source device 100 simultaneously emits two sets of light with different periods or frequencies, such as the first period T1 and the second period T2 in Figures 8A to 8C, the light source device 100 can perform two kinds of light stimulation with different frequencies on the patient, increasing the Stimulation of the patient's brain.

FIG. 9 is a timing diagram of optical signals according to some embodiments of the present invention. According to some embodiments, the first light source 110 and the second light source 120 in FIG. 1 can have the same or different phosphor compositions, so two different light beams can be emitted at the same time, such as a combination of white light and blue light. The present invention does not This is the limit. As shown in FIG. 9 , in the first period T11 of the first cycle T1 , the first light beam 901 emitted by the first light source 110 is composed of white light 901A and blue light 901B. In the second period T12 of the first period T1, the second light beam 902 emitted by the second light source 120 is composed of white light 902A and blue light 902B. According to some embodiments, the light intensity difference between the first light beam 901 and the second light beam 902 is less than a threshold, for example less than 10% or less. The light intensity of the first light beam 901 is the sum of the light intensities of the white light 901A and the blue light 901B, and the light intensity of the second light beam 902 is the sum of the light intensities of the white light 902A and the blue light 902B. According to some embodiments, the white light 901A of the first light beam 901 and the white light 902A of the second light beam 902 may have the same color temperature and the same or different spectrum, the disclosure is not limited thereto. According to some embodiments, the blue light 901B of the first light beam 901 and the blue light 902B of the second light beam 902 may have the same color temperature and the same or different spectrum, but the invention is not limited thereto. According to some embodiments, in the first light beam 901, the light intensity ratio of white light 901A to blue light 901B may be the same as or different from the light intensity ratio of white light 902A to blue light 902B in the second light beam 902, which is not intended by the present invention limit. The combination of the white light and the blue light of the first light beam 901 and the second light beam 902 described in this embodiment can be applied to the foregoing embodiments, but is not limited thereto.

FIG. 10 is a timing diagram of optical signals according to some embodiments of the present invention. According to some embodiments, the first light source 110 and the second light source 120 in FIG. 1 may have the same or different light source composition, and thus may emit a combination of blue light, green light and red light. As shown in FIG. 10 , in the first period T11 of the first cycle T1 , the first light beam 1001 emitted by the first light source 110 is composed of blue light 1001A, green light 1001B and red light 1001C. In the second period T12 of the first period T1, the second light beam 1002 emitted by the second light source 120 is composed of blue light 1002A, green light 1002B and red light 1002C. According to some embodiments, the light intensity difference between the first light beam 1001 and the second light beam 1002 is less than a threshold, for example less than 10% or less. The light intensity of the first light beam 1001 is the sum of the light intensities of the blue light 1001A, green light 1001B and red light 1001C, and the light intensity of the second light beam 1002 is the sum of the light intensities of the blue light 1002A, green light 1002B and red light 1002C. According to some embodiments, the blue light 1001A of the first light beam 1001 and the blue light 1002A of the second light beam 1002 may have the same color temperature and the same or different spectrum, and the invention is not limited thereto. According to some embodiments, the green light 1001B of the first light beam 1001 and the green light 1002B of the second light beam 1002 may have the same color temperature and the same or different spectrums, and the invention is not limited thereto. According to some embodiments, the red light 1001C of the first light beam 1001 and the red light 1002C of the second light beam 1002 may have the same color temperature and the same or different spectrum, and the invention is not limited thereto. According to some embodiments, in the first light beam 1001, the light intensity ratio of the blue light 1001A, green light 1001B, and red light 1001C may be the same as that of the blue light 1002A, green light 1002B, and red light 1002C in the second light beam 1002. Or different, the present invention is not limited thereto. The combination of blue light, green light and red light of the first light beam 1001 and the second light beam 1002 described in this embodiment can be applied to the foregoing embodiments, but is not limited thereto.

FIG. 11 is a timing diagram of optical signals according to some embodiments of the present invention. According to some embodiments, the first light source 110 and the second light source 120 in FIG. 1 respectively emit monochromatic light or white light, where the color of a single light can have different spectrum. Therefore, the periodic variation of two different spectra can be used to modulate new light. As shown in FIG. 11 , in the first period T11 of the first period T1 , the first light source 110 emits a first light beam 1101 , and in the second period T12 of the first period T1 , the second light source 120 emits a second light beam 1102 . According to some embodiments, the spectra of the first light beam 1101 and the second light beam 1102 are different, and the difference in color coordinates is within 4 MacAdam ellipses. According to some embodiments, when the light source device 100 is applied to a display, the light intensity of the first light beam 1101 and the second light beam 1102 are the same (the intensity difference is less than 10%). According to some embodiments, when the light source device 100 is applied to external light stimulation, the light intensity of the first light beam 1101 and the second light beam 1102 are different. The combination of the first light beam 1101 and the second light beam 1102 described in this embodiment can be applied to the above-mentioned embodiments, but is not limited thereto. Regardless of whether it is white light composed of a single light source or a double light source, the higher the color rendering value, the better the user's orientation, and it is more obvious when the CRI>85.

FIG. 12 is a schematic diagram of the color coordinates of the same color temperature defined by the American National Standard Institute (ANSI). Please refer to FIG. 12 , in this embodiment, the same color temperature is defined according to the definition of the American National Standards Institute. In other words, for light sources with the same color temperature designed according to this standard, the color difference is not easy to be perceived by human eyes. Among them, please refer to Table 1 for the detailed coordinate values of the color coordinate types defined by the American National Standards Institute shown in the schematic diagram of Figure 12: Table 1 2700k 3000k 3500k 4000k X Y X Y X Y X Y center point 0.4578 0.4101 0.4338 0.4030 0.4073 0.3917 0.3818 0.3797 Tolerance quadrilateral 0.4813 0.4319 0.4562 0.4260 0.4373 0.3893 0.4593 0.3944 0.4562 0.4260 0.4299 0.4165 0.4147 0.3814 0.4373 0.3893 0.4299 0.4165 0.3996 0.4015 0.3889 0.3690 0.4147 0.3814 0.4006 0.4044 0.3736 0.3874 0.3670 0.3578 0.3898 0.3716 4500k 5000k 5700k 6500k X Y X Y X Y X Y center point 0.3611 0.3658 0.3447 0.3553 0.3287 0.3417 0.3123 0.3282 Tolerance quadrilateral 0.3736 0.3874 0.3548 0.3736 0.3512 0.3465 0.3670 0.3578 0.3551 0.3760 0.3376 0.3616 0.3366 0.3369 0.3515 0.3487 0.3376 0.3616 0.3207 0.3462 0.3222 0.3243 0.3366 0.3369 0.3205 0.3481 0.3028 0.3304 0.3068 0.3113 0.3221 0.3261 Wherein, the data range in Table 1 can be converted into the tolerance quadrangular color temperature range S1 to S8 in FIG. 12 . For example, the color temperature coordinates falling within the color temperature range S1 of the tolerance quadrilateral are very close to human eyes, and so on. In more detail, the tolerance quadrilateral in Table 1 can be further converted into the color temperature value range as shown in Table 2: Table 2 Nominal correlated color temperature (CCT) Target correlated color temperature (k) and tolerance (tolerance) 2700k 2725 ± 145 3000k 3045 ± 175 3500k 3465±245 4000k 3985 ± 275 4500k 4503 ± 243 5000k 5028 ± 283 5700k 5665 ± 355 6500k 6530 ± 510 Wherein, the data range in Table 2 can be converted into the elliptical color temperature ranges e1 to e8 in FIG. 3 , further speaking, these elliptical color temperature ranges e1 to e8 are also MacAdam (David MacAdam) ellipses. For example, the coordinates of the color temperature within the elliptical color temperature range e1 are very close to human eyes, and so on. It should be noted that the coordinate data in Table 1 and Table 2 is an example to illustrate that the color temperature in this embodiment is substantially the same. For the actual coordinate data, please refer to the latest definition of the American National Standards Institute, and this disclosure is not limited thereto. In another embodiment, substantially the same color temperature means within the same elliptical color temperature range. In this way, the light source device 100 can select light sources that provide different physiological stimulation values according to the actual use environment, time and purpose, so as to maintain the user's physiological cycle and provide sufficient light source.

13A and 13B are spectral distributions according to some embodiments of the invention. As shown in FIG. 13A, spectrum (A) and spectrum (B) have the same color temperature. In this embodiment, spectrum (A) has a color temperature of 5529K and spectrum (B) has a color temperature of 5400K, but they have different spectral distributions. Spectrum (A) has an intensity peak at about 450nm, and spectrum (B) has an intensity peak at about 460nm. Among them, the color rendering value CRI of spectrum (A) is 81, the color rendering value CRI of spectrum (B) is 86, and the color rendering value of spectrum (A) and spectrum (B) after mixing light is 86. As shown in Figure 13A, the range of the physiological stimulation value (Circadian Action Factor, CAF) of the spectrum (A) is CAF=0.65-0.75, and the range of the physiological stimulation value of the spectrum (B) is CAF=0.85-0.95, so in the same color temperature In some cases, lights of different light spectrums have different physiological stimulation values.

As shown in FIG. 13B , the two spectra in the figure are Spectrum (A) and Spectrum (C) respectively. The color temperature of Spectrum (C) is 4919K, and Spectrum (C) is a full spectrum in the wavelength range of 400-7000nm, so the color rendering value of Spectrum (C) is 97. The color rendering value of spectrum (A) and spectrum (C) after mixing is 90.

14A and 14B are the relationship between the color rendering value and the EEG signal according to some embodiments of the present invention. FIG. 14A is a single light source with a fixed flicker frequency. In this embodiment, the flicker frequency is 40 Hz to measure the electroencephalogram (electroencephalography, EEG) at 40 Hz in different color rendering values (color rendering index, CRI). signal strength. In FIG. 14A , the color temperatures of the light sources are all around 5000K. When the color rendering value of the light source gradually increases from 60 to close to 100, the EEG signal at 40Hz also increases correspondingly, which means that the higher the color rendering value of the light source, the better the response to the user, especially when the color rendering value CRI≥85 , the signal strength is above 4, which means that the signal strength is more significant than when the color rendering value CRI<85.

Fig. 14B is similar to Fig. 14A, but Fig. 14B uses two light sources to flash alternately at a fixed flicker frequency. In this embodiment, the flicker frequency is 40 Hz to measure the electroencephalogram (EEG) in different color rendering values (CRI). Signal strength at 40Hz. As shown in Figure 14B, when the color rendering value of the light source is less than 85, the EEG signal at 40 Hz (0.86-0.99) is significantly smaller than the EEG signal at 40 Hz when the color rendering value of the light source is greater than 85 (>1.79) , which means that the higher the color rendering value of the light source, the better the response to the user. It can be seen from FIG. 14B that when the color rendering value CRI≥85, the signal strength is above 1.5, indicating that the signal strength is more significant than when the color rendering value CRI<85.

In FIG. 14A and FIG. 14B , when CRI≥85, the EEG signal strength (>4) in FIG. 14A is stronger than the EEG signal strength (1.79-2.98) in FIG. 14B . Since a single light source is used for flashing in FIG. 14A , the brightness difference is more obvious, and the obtained EEG signal will be stronger. In FIG. 14B , since two light sources are used to flash alternately, the brightness difference is less obvious, and the obtained EEG signal will be weaker than the EEG signal obtained when a single light source is flashed (as shown in FIG. 14A ). However, in actual use, flickering with a single light source will cause a greater burden on the eyes of the user due to the obvious contrast between light and dark. Flashing with dual light sources, since the brightness change is relatively small, it will hardly burden the user's eyes, so it is more suitable for integration into the daily life environment.

15A-15B are timing diagrams of optical signals according to some embodiments of the present invention. According to some embodiments, a single display pixel in the first light source 110 and the second light source 120 in FIG. 1 has periodic variations of different monochromatic light combinations. At this time, a single display pixel can have two different combination changes, such as emitting different monochromatic lights at the same time, or emitting different monochromatic lights sequentially. As shown in FIG. 15A , in the first period T11 of the first cycle T1 , the first light source 110 simultaneously emits red light 1201A, green light 1201B and blue light 1201C. In the second period T12 of the first period T1, the second light source 120 simultaneously emits red light 1202A, green light 1202B and blue light 1202C. As shown in FIG. 15B, in the first part T11A, the second part T11B, and the third part T11C of the first period T11 of the first period T1, the first light source 110 sequentially emits red light 1211A, green light 1211B and Blu-ray 1211c. In the first part T12A, the second part T12B, and the third part T12C of the second period T12 of the first period T1, the second light source 120 sequentially emits red light 1212A, green light 1212B and blue light 1212C. According to some embodiments, the wavelengths of the red light 1211A and the red light 1212B are different, and the difference in their color coordinates may be within 4 MacAdam ellipses. According to some embodiments, the wavelengths of the green light 1211B and the green light 1212B are different, and the difference in color coordinates may be within 4 MacAdam ellipses. According to some embodiments, blue light 1211C and blue light 1212C have different wavelengths, and the difference in color coordinates may be within 4 MacAdam ellipses. According to some embodiments, when the light source device 100 is applied to a display, the light intensity of the first light beam 1201 and the second light beam 1202 are the same. According to some embodiments, when the light source device 100 is applied to external light stimulation, the light intensity of the first light beam 1201 and the second light beam 1202 are different. The combination of the first light beam 1201 and the second light beam 1202 described in this embodiment can be applied to the above-mentioned embodiments, but is not limited thereto.

Fig. 16 is a schematic diagram of a display device according to some embodiments of the present invention. Referring to FIG. 16 , a display device 1300 of this embodiment includes a backlight element 1310 and a display 1320 . The display 1320 can be a liquid crystal display panel or other suitable spatial light modulator. The backlight element 1310 can be various embodiments of the light source device 100 mentioned above, and is used for providing the backlight of the display 1320 . According to some embodiments, the backlight element 1310 is a direct type backlight element, or an edge type backlight element, and the invention is not limited thereto. When the backlight element 1310 includes various embodiments of the aforementioned light source device 100 , the light cycle of the display backlight is composed of two different light rays. Therefore, when the user uses the display, he can receive light stimulation at the same time. In another embodiment, the light source of the display device comes from the light emitting unit of the display, and the light emitted by each light emitting unit is emitted alternately in a cycle time as in the above embodiment.

Fig. 17 is a schematic diagram of a display device according to some embodiments of the present invention. As shown in FIG. 17 , the display device 1400 has a light source device 1410 . The light source device 1410 is similar to the light source device 100 in FIG. 1 , and can alternately emit two different kinds of light in a cycle. In this embodiment, the light beam emitted by the light source device 1410 is infrared light.

In some embodiments, the above-mentioned light source device or display device can be further combined with an eye movement sensor to track the user's eye E movement, and the light source device 1410 can generate infrared light corresponding to the first cycle with a flicker frequency of 40 Hz , providing infrared light with a flickering frequency of 40 Hz or other invisible light stimulation around the user's line of sight.

To sum up, the present invention combines more than two kinds of light to emit alternately within a period of time, so as to provide light stimulation with therapeutic effect. By combining different forms of light, it can effectively provide a variety of treatment methods.

100: light source device 110: The first light source 120: Second light source 130: The third light source 140: The fourth light source 150: sound source 201, 301, 401, 501, 601, 701, 801, 901, 1001, 1101, L1: the first beam 202, 302, 402, 502, 602, 702, 802, 902, 1002, 1102, L2: second beam 703, S: Sonic pulse 803, L3: third beam 804, L4: fourth beam 901A, 902A: white light 901B, 902B: blue light 1001A, 1002A, 1201A, 1202A, 1211A, 1212A: red light 1001B, 1002B, 1201B, 1202B, 1211B, 1212B: Blu-ray 1001C, 1002C, 1201C, 1202C, 1211C, 1212C: green light 1300: display device 1310: backlight element 1320: display 1400: display device 1410: Light source device T1: the first cycle T2: the second cycle T11, T21: the first period T12, T22: the second period T11A, T12A: Part 1 T11B, T12B: Part Two T11C, T12C: Part III

Fig. 1 is a schematic diagram of a light source device according to some embodiments of the present invention. 2 to 6 are timing diagrams of optical signals according to some embodiments of the present invention. FIG. 7 is a timing diagram of acousto-optic signals according to some embodiments of the present invention. 8A to 8C are timing diagrams of optical signals according to some embodiments of the present invention. 9 to 11 are timing diagrams of optical signals according to some embodiments of the present invention. FIG. 12 is a schematic diagram of color coordinates of the same color temperature defined by the American National Standards Institute. 13A and 13B are spectral distributions with the same color temperature according to some embodiments of the present invention. 14A and 14B are the relationship between the color rendering value and the EEG signal according to some embodiments of the present invention. 15A-15B are timing diagrams of optical signals according to some embodiments of the present invention. Fig. 16 is a schematic diagram of a display device according to some embodiments of the present invention. Fig. 17 is a schematic diagram of a display device according to some embodiments of the present invention.

201, L1: first beam 202, L2: second beam T1: the first cycle T11: the first period T12: the second period

Claims (27)

A light source device, comprising: a first light source providing a first light beam during a first period of a first cycle; and a second light source providing a second light beam during a second period of said first cycle, Wherein the first light beam and the second light beam are emitted alternately within the first period, and the color rendering value of the mixed light of the first light beam and the second light beam is greater than or equal to 85. The light source device as claimed in claim 1, wherein the first light beam and the second light beam have different spectra. In the light source device according to claim 2, the first light beam and the second light beam have the same color temperature. In the light source device according to claim 2, at least one of the first light beam and the second light beam is full-spectrum light. The light source device according to claim 1, at least one of the first light beam during the first period and the second light beam during the second period is a continuous light beam. The light source device according to claim 1, at least one of the first light beam during the first period and the second light beam during the second period is a scintillation light beam. According to the light source device described in Claim 6, a flicker frequency range of the scintillation light beam is 500-2000 Hz. The light source device according to claim 1, the first light beam in the first time period and the second light beam in the second time period are both flickering light beams, and a first flickering frequency of the first light beam is different at a second blinking frequency of the second light beam. In the light source device according to claim 1, the sum of the duration of the first period and the duration of the second period is equal to the duration of the first period. According to the light source device described in claim 1, the frequency corresponding to the first period is 35-45 Hz. The light source device as claimed in claim 1, wherein the first light beam and the second light beam have different light intensities. The light source device as claimed in claim 11, wherein the light intensity difference between the first light beam and the second light beam is less than 10%. The light source device as claimed in claim 1 further includes a sound source for generating sound wave pulses, and the emission period of the sound wave pulses is the same as the first period. The light source device according to claim 1, wherein the wavelength of at least one of the first light beam or the second light beam is in the range of 380-1050 nm. The light source device according to claim 1, wherein at least one of the first light beam or the second light beam is monochromatic light. The light source device according to claim 1, wherein at least one of the first light beam or the second light beam is mixed light. The light source device as claimed in claim 16, wherein the mixed light includes red light, blue light and green light. The light source device as claimed in claim 16, wherein the mixed light includes white light and blue light. The light source device as described in claim 1, further comprising: a third light source providing a third light beam during a third period of a second cycle; and a fourth light source providing a fourth light beam during a fourth period of said second cycle, The third light beam and the fourth light beam are emitted alternately within the second period. The light source device as claimed in claim 19, wherein the third light beam and the fourth light beam have the same color temperature. In the light source device according to claim 19, the color rendering value of the mixed light of the third light beam and the fourth light beam is greater than or equal to 85. In the light source device according to claim 19, the frequency corresponding to the second period is different from the frequency corresponding to the first period. In the light source device according to claim 19, the third light beam and the fourth light beam have different light intensities. In the light source device according to claim 19, the third light beam and the fourth light beam have different spectra. A display device, comprising a light source device, the light source device comprising: a first light source providing a first light beam during a first period of a first cycle; and a second light source providing a second light beam during a second period of said first cycle, Wherein the first light beam and the second light beam are emitted alternately within the first period, and the color rendering value of the mixed light of the first light beam and the second light beam is greater than or equal to 85. A light source device, comprising: a first light source providing a first light beam during a first period of a first cycle; and a second light source providing a second light beam during a second period of said first cycle, Wherein the first light beam and the second light beam are emitted alternately within the first period, and the first light beam and the second light beam have the same color temperature. In the light source device according to Claim 26, the color rendering value of the mixed light of the first light beam and the second light beam is greater than or equal to 85.

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