WO2020114226A1 - Light emitting device, display device and control method for light emitting device - Google Patents

Abstract

Disclosed are a light emitting device (10), a display device (1), and a control method for the light emitting device (10). The light emitting device (10) comprises a light source (101) for emitting a first light (L1), and filter components (100, 300, 400) for filtering the first light (L1) to obtain a second light. The filter components (100, 300, 400) are configured to filter out blue light with a wavelength less than a predetermined wavelength or blue light with a wavelength within a predetermined wavelength range, and to obtain a third light emitted by the light emitting device (10) and including the second light and/or the unfiltered first light (L1), the blue light weighted radiance of the third light being less than a preset brightness. The filter components (100, 300, 400) are used to filter out blue light with a wavelength less than a predetermined wavelength or blue light with a wavelength within a predetermined wavelength range, which is beneficial to reducing the value of the blue light weighted radiance of the third light emitted by the light emitting device (10), so as to satisfy the requirement of low blue light.

Description

Light-emitting device, display device and control method of light-emitting device Technical field

The present invention relates to the field of optical technology, and in particular, to a light-emitting device, a display device, and a control method of the light-emitting device.

Background technique

This section is intended to provide a background or context for the specific embodiments of the invention recited in the claims. The description here is not admitted to be prior art because it is included in this section.

At present, laser projectors usually use blue light to excite phosphors to generate light sources of other colors. Blue light has a narrow bandwidth and high energy, which can cause blue light radiation hazards.

The harm of blue light to human eyes is mainly the photochemical effect. Photochemical action refers to the chemical behavior and physical process in which molecules in a cell absorb photons of a specific wavelength and then generate electronic transitions to form molecules in an excited state. The intensity of the photochemical damage depends on the wavelength. This characteristic can be measured by the blue light damage weighting function B(λ), that is, the reciprocal of the measurement (or energy) required for a certain wavelength to cause a certain reaction is finally normalized.

Please refer to Figure 1, for the relative sensitivity curve corresponding to the blue light weighting function, light with a wavelength from 300 to 700 nm will have the effect of blue light damage, but the blue light part of 400 to 500 nm produces the most damage. Table 1 gives the normalized values of the blue-light hazard weighting function from 400 to 500 nm. At 435 nm and 440 nm, the blue-light hazard weighting function is the largest. The value of the blue-light hazard weighting function is 1.00.

Table 1 Values corresponding to the weighting function of blue-ray hazard at 400-500nm

λ(nm)	Blue light hazard weighting function value B(λ)
400	0.1
405	0.2
410	0.4
415	0.8

420	0.9
425	0.95
430	0.98
435	1.00
440	1.00
445	0.97
450	0.94
455	0.90
460	0.80
465	0.70
470	0.62
475	0.55
480	0.45
485	0.40
490	0.22
495	0.16

With the increasing attention paid to blue light hazards today, countries have begun to formulate relevant safety standards for blue light hazards to reduce blue light hazards in products. In order to prevent photochemical damage to the retina caused by long-term blue-ray radiation, it is necessary to provide a display device that can effectively reduce the hazard of blue light in a specific wavelength band.

Summary of the invention

An aspect of the present invention provides a light emitting device, including:

A light source for emitting the first light; and

A filter component, configured to filter the first light to obtain second light, and the filter component is configured to filter blue light with a wavelength less than a preset wavelength or blue light with a wavelength within a preset wavelength range, A third light including the second light and/or the first light without filtering light emitted from the light-emitting device is obtained, wherein the blue light weighted radiance of the third light is less than the preset brightness.

Another aspect of the present invention provides a display device, including:

A light-emitting device, which is the light-emitting device described above; and

A light modulation device is used to modulate the first light emitted by the light source, and the filter component is used to filter the first light modulated by the light modulation device.

Another aspect of the present invention provides a control method of a light-emitting device including a light source and a filter assembly, the filter assembly including a cut-off filter and a driving unit connected to each other, including the following steps:

Controlling the light source to emit first light;

Detecting the current blue-weighted brightness of the third light emitted from the light-emitting device; and

Calculating the movement data of the cut-off filter according to the current blue-ray weighted radiance, the preset brightness and the movement range of the cut-off filter, and controlling the driving unit to drive the cut-off filter according to the movement data The film moves to the target position, and the corresponding light beam in the first light is filtered by the cut-off filter to filter out blue light with a wavelength less than a preset wavelength or blue light with a wavelength within a preset wavelength range and The second light is obtained. The third light emitted from the light-emitting device includes the second light and/or the first light without filtering light. The blue light weighted radiance of the third light is less than the preset brightness.

In the light-emitting device, the display device, and the control method of the light-emitting device provided by the present invention, the filter component is used to filter out blue light with a wavelength less than a preset wavelength or blue light with a wavelength within a preset wavelength range, which is beneficial to reduce the The light emitting device and the display device emit blue light weighted radiance value of the third light to meet the requirement of low blue light.

BRIEF DESCRIPTION

In order to more clearly explain the technical solutions of the embodiments/modes of the present invention, the drawings required for the description of the embodiments/modes will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present invention / Way, for those of ordinary skill in the art, without paying any creative labor, other drawings can also be obtained based on these drawings.

Figure 1 shows the relative sensitivity curve of the blue light damage weighting function.

2 is a schematic diagram of a light emitting device provided by the present invention.

3 is a power spectrum curve of light emitted by a conventional light-emitting device.

FIG. 4 is a schematic diagram of light interception of the filter assembly shown in FIG. 2.

FIG. 5 is a schematic diagram of light interception in the second embodiment of the filter assembly shown in FIG. 2.

6A is a schematic structural view of the light emitting device shown in FIG. 2 in the third embodiment.

FIG. 6B is another schematic structural diagram of the light emitting device shown in FIG. 6A.

7 is a schematic structural diagram of a light filter assembly provided in the fourth embodiment of the light emitting device shown in FIG. 2.

8A is a schematic structural diagram of a cut-off filter provided by the light-emitting device shown in FIG. 2 in a fifth embodiment.

FIG. 8B is a schematic structural view of the cut-off filter shown in FIG. 8A at different positions.

9 is a schematic diagram of a display device provided by the present invention.

Symbol description of main components

Light emitting device	10
light source	101
First light	L1
Filter components	100, 300, 400
Drive unit	310, 410
Drive components	311
Rod	313
track	411
Connection	413
Cut- off filter	320, 420, 520
First area	521
Second area	522
First position	M
Second position	N
display screen	1
Light modulation device	50

The following specific embodiments will further illustrate the present invention with reference to the above drawings.

detailed description

In order to be able to understand the above objects, features and advantages of the present invention more clearly, the present invention will be described in detail below with reference to the drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other if there is no conflict.

In the following description, many specific details are set forth in order to fully understand the present invention. The described embodiments are only a part of the embodiments of the present invention, but not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terminology used in the description of the present invention herein is for the purpose of describing specific embodiments, and is not intended to limit the present invention.

Please refer to FIG. 2, which is a schematic diagram of a light-emitting device 10 provided by the present invention. The light emitting device 10 includes a light source 101 and a filter assembly 100. Among them, the light source 101 is used to emit the first light L1; the filter assembly 100 is used to filter the first light L1 to obtain the second light, and the filter assembly 100 is used to filter out blue light or wavelengths whose wavelength is less than the preset wavelength Blue light within a preset wavelength range; the third light emitted from the light emitting device 10 includes second light and/or unfiltered first light, and the blue light weighted radiance of the third light is less than the preset brightness.

Specifically, the light source 101 may be a laser light source, an LED light source, a fluorescent light source, or a laser fluorescent light source, and the type of the light source is not limited in the present invention. The first light L1 may be monochromatic light, such as laser light or fluorescence such as blue light, red light, green light, or ultraviolet light. The first light L1 may also be composite light (mixed light of several colors), such as yellow light. The first light may be illumination light with uniform brightness, or image light with light and dark distribution.

The first light L1 is visible light, and the wavelength range of visible light is approximately around 380-780nm, and the wavelength range of ultraviolet light is below 400nm. However, light with a wavelength of 300-700nm will have a blue light harmful effect, visible, regardless of the first Whether the light L1 emits monochromatic light or composite light, most of the light in the first light band L1 has blue light hazards, and blue light with a wavelength of 400 to 500 nm generates blue light hazards the most.

The intensity of the blue light hazard produced by the first light L1 can be measured by the blue light weighted radiance. The blue light weighted amplitude of the first light L1 is the energy after the weighted integration of the spectral radiance L _λ of the first light L1 and the blue light weighted function, When the blue light weighted brightness of the first light L1 is less than the preset brightness, it meets the requirements of blue light damage protection.

The blue-light weighted radiance value is recorded as L _B , the spectral radiance value is recorded as L _λ , the blue light hazard weighting function value is recorded as B(λ), and the preset brightness value is recorded as z. In one embodiment, the preset brightness value z=100W·m ^-2 ·sr ^-1 , that is, the blue-weighted amplitude brightness of the first light L1 is required to satisfy Formula 1:

L _B = ΣL _λ ·B(λ)·Δλ≤100W·m ^-2 ·sr ^-1 (Equation 1).

Blue light weighted radiance is the weighted integral of the energy corresponding to each wavelength in the corresponding spectrum multiplied by the weight function of blue light hazard corresponding to each wavelength.

Please refer to FIG. 3, which is a power spectrum curve of light emitted by a conventional light emitting device. The existing light-emitting device may be a laser fluorescent light source system of a laser projector. The laser fluorescent light source system uses a blue laser to excite the phosphor to generate other colors of primary color light. The first peak on the left side in the figure corresponds to the energy of the blue laser. The bandwidth of the color laser is narrow but the energy is high, which cannot satisfy Equation 1. Thus, the first portion having a cut-off blue light hazard, in particular blue light hazard is a strong part of the light is turned off, help to reduce the value of the emitted blue light weighted radiance L _B in order to meet the requirements of low blue light.

Please refer to FIG. 4, which is a schematic diagram of the light interception of the filter assembly 100 shown in FIG. 2. The horizontal axis of the coordinate axis in the figure represents the wavelength, and the vertical axis represents the efficiency. The maximum efficiency is 1, and the efficiency equal to 1 represents the value of the blue light hazard weighting function B(λ) of the light is 1. The wavelength range of the first light incident on the filter assembly 100 is approximately 380-700 nm, and the wavelength of the blue light weighting function B(λ) is 1 at a wavelength of about 430 nm. The filter assembly 100 includes a cut-off filter to The light with a wavelength less than the preset wavelength is intercepted, and the first light with a wavelength greater than the preset wavelength can be transmitted through the cut-off filter, so that the blue light damage caused by the first light is weakened within a certain wavelength range, and part of the energy in the blue light is retained, In order to facilitate the use of the optical path of the latter stage. The preset wavelength value is recorded as λ _1. As shown in FIG. 4, 390 nm<λ ₁ <400 nm, it can be understood that the preset wavelength value can be selected according to Formula 1. In this embodiment, the cut-off filter is preferably a long-pass filter to filter out light with a wavelength less than a preset wavelength. The cut-off filter may cut off 100% of the light with a wavelength less than the preset wavelength. In one embodiment, the cut-off filter is a partial cut-off filter, such as 90% or other proportions cut off the light with a wavelength less than the second wavelength. The second wavelength value is recorded as λ ₂ , where λ ₁ <λ ₂ , that is, 10% or other proportions of the light incident on the first light L1 whose wavelength is less than the second wavelength can also pass through the cut-off filter, so that the light emitting device 10 The color of the outgoing image is fuller and richer.

Please refer to FIG. 5, which is a schematic view of the light interception of the filter assembly 100 shown in FIG. 2 in the second embodiment. The horizontal axis of the coordinate axis in the figure represents the wavelength, and the vertical axis represents the efficiency. The maximum efficiency is 1, and the efficiency equal to 1 represents the value of the blue light hazard weighting function B(λ) of the light is 1. The value B(λ) of the blue light weighting function of the first light L1 is around 440 nm, but the value B(λ) of the light weighting function B of the light of 415-460 nm is all above 0.8. The cut-off filter provided in this embodiment is a band-stop filter, which is used to intercept light within a preset range p, and light outside the preset range p may pass through the cut-off filter. The preset range p can be expressed as (λ ₃ -x, λ ₃ +x) nm, where in one embodiment, the value of x is small, such as x=2, so as not to affect the light emitted by the light emitting device 10 and the display device Color accuracy. It can be understood that the cut-off filter in this embodiment may cut off 100% or part of the light in the preset range p.

It should be noted that, within the scope of the spirit or basic characteristics of the present invention, the specific solutions in the embodiments may also be applicable to each other. To save space and avoid duplication, they will not be repeated here.

Please refer to FIGS. 6A and 6B. FIG. 6A is a schematic structural view of the light emitting device 10 shown in FIG. 2 in the third embodiment, and FIG. 6B is another structural schematic view of the light emitting device 10 shown in FIG. 6A. In this embodiment, the light-emitting device 10 includes the light source 101 and the filter assembly 300. The filter assembly 300 includes a movable cut-off filter 320, and the light-emitting device 10 is used to dynamically control the movement of the cut-off filter 320 according to the blue-weighted radiance of the third light emitted from the light-emitting device 10 in the current state to The corresponding beam in the light L1 is filtered.

Specifically, the filter assembly 300 further includes a driving unit 310 for driving the cut-off filter 320 to move between the first position M and the second position N. The first position M is a position where the cut-off filter 320 does not filter the light emitted by the light source 101; the second position N is a position where the cut-off filter 320 can filter the light emitted by the light source 101. As shown in FIG. 6A, when the cut-off filter 320 is at the first position M, the first light L1 exits the light-emitting device 10 without being filtered by the filter assembly 300, and the third light is the first light, specifically, cut-off The filter 320 is located outside the optical path of the first light L1; when the cut-off filter 320 is located at the second position N, all the first light L1 is filtered by the cut-off filter 320 to be converted into second light and third light Is the second light; as shown in FIG. 6B, when the cut-off filter 320 is located between the first position M and the second position N, part of the first light L1 is filtered by the cut-off filter 320 and then converted to the second light For light, a portion of the first light L1 that is not filtered by the cut-off filter 320 exits from the light emitting device 10, and the third light includes second light and first light that is not filtered light.

Further, the light emitting device 10 further includes a brightness sensor (not shown) and a control device (not shown). Wherein, the brightness sensor is disposed on the light exiting light path of the display device, and is used to detect the current blue light weighted radiance of the third light. In one embodiment, the brightness sensor is used to detect the current blue-weighted radiance of light in a certain wavelength range. The wavelength of visible light is distributed at 300-780 nm, where blue light has a larger value of blue-light weighted radiance than other colors. , The brightness sensor can be used to detect the current blue light weighted radiance generated by the blue light in the visible light corresponding to the band light. In one embodiment, the brightness sensor is used to detect the current blue light generated by the blue light in the visible light and the green light corresponding to the light band Weighted radiance.

The control device is used to determine whether the current working mode of the light emitting device 10 is the first working mode. In this working mode, the blue light emitted from the third light emitted by the light emitting device 10 is less harmful than other working modes. The first working mode can also be called For low blue light mode. The light-emitting device 10 may also have multiple working modes other than the first working mode, such as a highlight mode, a normal mode, etc., and the light-emitting device 10 may be adjusted between multiple modes according to preset rules, or may be operated according to user operations Transform. If the light-emitting device 10 is in the first working mode, the weighted radiance of the current blue light is detected, the preset brightness, and the relative positional relationship between the first position M and the second position N (cutoff filter in the filter assembly 300 The movement range of the optical filter 320), calculates the movement data of the cut-off filter 320, and controls the driving unit 310 to drive the cut-off filter 320 to the target position to filter the corresponding light beam in the first light L1. In one embodiment, in some image frames in the display image sequence, the blue light component is less, and the filter component does not filter the first light, the blue light weighted radiance of the third light is already less than the preset Brightness, the display device does not filter the first light by using the filter component.

In this embodiment, the driving unit 310 further includes a driving assembly 311 and a rod body 313, and the rod body 313 is connected between the driving assembly 311 and the cut-off filter 320. The driving component 313 is used to drive the rod body 313 to rotate by a corresponding angle to the target position around the driving component 311 according to the movement data. In one embodiment, the driving assembly 311 includes a gear, and the gear is used to drive the rod body 313 to rotate around the gear within an angle range of 0-θ. In other embodiments, the driving assembly 311 may also use a turbo worm or other mechanical transmission the way.

The cut-off filter 320 moves from the first position M to the target position, the angle value of the rod 313 turning is defined as θ ₀ , the control device is based on the current blue light weighted radiance value L _B0 detected in real time, the preset brightness value z, and The relative positional relationship between the first position M and the second position N calculates the angle value θ ₀ corresponding to the target position of the cut-off filter 320. In one embodiment, the angle θ _{0 of the} rotation of the rod 313 satisfies the formula 2:

θ ₀ ={(L _B0 -z)/z}*θ (Formula 2).

For example, if the detected current blue light weighted radiance value L _B0 =150 W·m ^-2 ·sr ^-1 , which exceeds 50% of the preset brightness value, the rotation angle value of the rod 313 corresponding to the target position is θ/2.

Please refer to FIG. 7, which is a schematic structural view of a light filter assembly 400 provided by the light emitting device 10 shown in FIG. 2 in the fourth embodiment. The main difference between the filter assembly 400 and the filter assembly 300 is that the driving unit 410 of the filter assembly 400 is used to drive the cut-off filter 420 to move to the target position along a straight line according to the movement data. The driving unit 410 includes a rail 411 and a connecting portion 413 that are slidingly connected, one end of the connecting portion 413 is used to carry the cut-off filter 420, and the other end of the connecting portion 413 is used between the first position M and the second position N of the track 411 During sliding, the distance between the first position M and the second position N is L. The distance between the target position and the first position M is L ₀ , and the distance L ₀ satisfies the formula 3:

L ₀ ={(L _B0 -z)/z}*L (Equation 3).

It can be understood that the driving unit 410 can also move the cut-off filter 420 by belt transmission or the like.

Please refer to FIGS. 8A and 8B. FIG. 8A is a schematic structural view of the cut-off filter 520 provided in the fifth embodiment of the light-emitting device 10 shown in FIG. 2, and FIG. 8B is the cut-off filter 520 shown in FIG. 8A. Schematic diagram of the structure at different locations.

As shown in FIG. 8A, the surface of the cut-off filter 520 includes a first region 521 and a second region 522 disposed adjacent to each other. Blue light or blue light with a wavelength within a preset wavelength range to obtain second light. The first area 521 and the second area 522 may also be arranged at intervals. The shape of the cut-off filter 520 is not limited to a circle, but may also be a square, ellipse, or other regular or irregular shapes. In this embodiment, the first area 521 and the second area 522 are respectively disposed at one end of the surface of the cut-off filter 520. In other embodiments, the first area 521 and the second area 522 may also be circular, circular, Either of a square shape or a bar shape, the first area 521 may also be disposed around the second area 522.

As shown in FIG. 8B, when the cut filter 520 is located at the first position M, the second region 522 is located outside the optical path of the first light, and the first light does not pass through the cut filter 520 or pass through the cut filter 520 After the first area 521 is emitted from the light emitting device 10, the third light is the first light; when the cut-off filter 520 is at the second position N, all the first light passes through the second area 522 and is converted to the second light From the light emitting device 10, the third light is the second light; when the cut-off filter 520 is located between the first position M and the second position N, a part of the first light passes through the first area 521, a part of the first light passes through The second light is converted into second light through the second area 522, and the third light includes the second light and the first light without filtering light.

In this embodiment, by rotating the cut-off filter 520 so that the corresponding portion of the second region 522 is located on the optical path of the first light, the corresponding beam of the first light is filtered. Specifically, the central angle occupied by the portion irradiated by the first light in the second region 522 satisfies Formula 4:

α={(L _B0 -z)/z}*180° (Equation 4).

The invention also provides a control method of a light emitting device. The light emitting device includes a light source and a filter assembly. The filter assembly includes a cut-off filter and a driving unit connected to each other. The control method of the light emitting device includes the following steps:

S1: Control the light source to emit the first light;

S2: Detect the current blue light weighted brightness of the third light emitted by the light emitting device;

S3: Calculate the movement data of the cut-off filter according to the current blue-ray weighted radiance, preset brightness and the movement range of the cut-off filter, and control the drive unit to drive the cut-off filter to the target position according to the movement data, using the cut-off The filter filters the corresponding light beam in the first light and obtains the second light, so that the third light emitted from the light-emitting device includes the second light and/or the unfiltered first light, and the blue light of the third light is weighted The radiance is less than the preset brightness.

In one embodiment, step S3 further includes the step of determining whether the current light-emitting device is in the first operating mode; if the current light-emitting device is in the first operating mode, the weighted radiance, the preset luminance, and the cutoff according to the current blue light The movement range of the filter is calculated to obtain the movement data of the cut-off filter.

The light emitting device 10 provided by the present invention may be a light source in a lighting device, a background light source in a display device, or a light source system in a display device. The present invention also provides a display device using the above light-emitting device. The display device may be a series of laser projectors such as an educational projector, an engineering projector, a laser TV, and the like. The display device of this embodiment is described by taking the projection device as an example.

Please refer to FIG. 9, which is a schematic diagram of a display device 1 provided by the present invention. The display device 1 includes a light-emitting device 10 and a light modulation device 50. The light-emitting device 10 includes a light source 101 and a filter assembly 100. The light source 101 and the filter assembly 100 are both applicable to the technical solutions provided in the above embodiments. The light modulation device 50 uses To modulate the first light L1 emitted from the light source 101, the filter assembly 100 is used to filter the first light L1 modulated by the light modulation device 50, which is beneficial to reduce the blue light weighted radiance of the third light emitted from the display device 1 The value of L _B to meet the requirements of low blue light.

It can be understood that the specific technical solutions in the foregoing embodiments can be applied to the control method of the display device, and details are not described herein.

In the display device and the control method of the display device provided by the present invention, the blue light with a wavelength less than a preset wavelength or a wavelength within a preset wavelength range is filtered by using a filter component, which is beneficial to reduce the blue light weighted radiation of the third light emitted by the display device Brightness value to meet the requirements of low blue light.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present invention is defined by the appended claims rather than the above description, and is therefore intended to fall within the claims All changes within the meaning and scope of the equivalent requirements are included in the present invention. Any reference signs in the claims should not be considered as limiting the claims involved. In addition, it is clear that the word "include" does not exclude other units or steps, and the singular does not exclude the plural. Multiple devices stated in the device claims can also be implemented by the same device or system through software or hardware. The first and second words are used to indicate names, but do not indicate any particular order.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be Modifications or equivalent replacements are made without departing from the spirit and scope of the technical solutions of the present invention.

Claims (12)

1. A light-emitting device, characterized in that it includes:

   A light source for emitting the first light; and

   A filter component, configured to filter the first light to obtain second light, and the filter component is configured to filter blue light with a wavelength less than a preset wavelength or blue light with a wavelength within a preset wavelength range, A third light including the second light and/or the first light without filtering light emitted from the light-emitting device is obtained, wherein the blue light weighted radiance of the third light is less than the preset brightness.
2. The light-emitting device according to claim 1, wherein the filter assembly includes a cut-off filter, and the cut-off filter is used to filter out blue light with a wavelength less than the preset wavelength or the wavelength is located at The blue light in the preset wavelength range.
3. The light-emitting device according to claim 2, wherein the cut-off filter is a long-wave pass filter or a band-stop filter.
4. The light-emitting device according to claim 2, wherein the cut-off filter is always located on the light exit path of the first light.
5. The light emitting device according to claim 2, wherein:

   The filter assembly further includes a driving unit for driving the cut-off filter to move between the first position and the second position;

   The light emitting device further includes:

   A brightness sensor for detecting the current blue light weighted radiance of the third light;

   The control device is used to calculate the movement data of the cut-off filter according to the current blue light weighted radiance, the preset brightness, and the relative position relationship between the first position and the second position, and control the The driving unit drives the cut-off filter to move to a target position according to the movement data.
6. The light-emitting device according to claim 5, wherein when the cut-off filter is at the first position, the first light does not pass through the cut-off filter. Exit, the third light is the first light; when the cut-off filter is in the second position, all the first light is converted into the second light after being filtered by the cut-off filter Light, the third light is the second light; when the cut-off filter is located between the first position and the second position, part of the first light passes through the filter of the cut-off filter After the light is converted into the second light, the third light includes the second light and the first light without filtering light.
7. The light-emitting device according to claim 5, wherein the drive unit further comprises a drive assembly and a rod body, the rod body is connected between the drive assembly and the cut-off filter, the drive assembly is used for According to the movement data, the rod is driven to rotate around the drive assembly by a corresponding angle to the target position.
8. The light-emitting device according to claim 5, wherein the driving unit is configured to move the cut-off filter to the target position in a straight line according to the movement data.
9. The light-emitting device according to claim 5, wherein the cut-off filter surface includes a first area and a second area, the first area is used to transmit light, and the second area is used to filter wavelength Blue light less than the preset wavelength or blue light with a wavelength within the preset wavelength range to obtain the second light.
10. The light-emitting device according to claim 9, wherein when the cut-off filter is located at the first position, the second area is located outside the optical path of the first light, and the third light Is the first light; when the cut-off filter is in the second position, all the first light is converted into the second light through the second area, and the third light is the first light Two light; when the cut-off filter is located between the first position and the second position, a portion of the first light passes through the first area, and a portion of the first light passes through the second area For the second light, the third light includes the second light and the unfiltered first light.
11. A display device is characterized by comprising:

    A light-emitting device, which is the light-emitting device according to any one of claims 1-10; and

    A light modulation device is used to modulate the first light emitted by the light source, and the filter component is used to filter the first light modulated by the light modulation device.
12. A control method of a light-emitting device, the light-emitting device includes a light source and a filter assembly, the filter assembly includes a cut-off filter and a driving unit connected to each other, characterized in that it includes the following steps:

    Controlling the light source to emit first light;

    Detecting the current blue-weighted brightness of the third light emitted from the light-emitting device; and

    Calculating the movement data of the cut-off filter according to the current blue-ray weighted radiance, the preset brightness and the movement range of the cut-off filter, and controlling the driving unit to drive the cut-off filter according to the movement data The film moves to the target position, and the corresponding light beam in the first light is filtered by the cut-off filter to filter out blue light with a wavelength less than a preset wavelength or blue light with a wavelength within a preset wavelength range and The second light is obtained. The third light emitted from the light-emitting device includes the second light and/or the first light without filtering light. The blue light weighted radiance of the third light is less than the preset brightness.

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