CN115877624A

CN115877624A - Adjusting method of filter element, light source device and projection equipment

Info

Publication number: CN115877624A
Application number: CN202211680111.2A
Authority: CN
Inventors: 吴昊; 袁敏
Original assignee: Yibin Jimi Photoelectric Co Ltd
Current assignee: Yibin Jimi Photoelectric Co Ltd
Priority date: 2022-12-27
Filing date: 2022-12-27
Publication date: 2023-03-31

Abstract

The application discloses a method for adjusting a filter element, a light source device and a projection device; the method comprises the steps of obtaining ambient brightness; determining a filter factor according to the ambient brightness; determining the spectral information corresponding to the filter element according to the filter factor; determining a target voltage corresponding to the filter element according to the spectrum information; and adjusting the transmission spectrum of the filter element by adopting the target voltage so as to enable light corresponding to the spectrum information to transmit through the filter element. In this application, the target voltage is determined through the ambient brightness, the filtering characteristic of the filter element can be adjusted by adopting the target voltage, and light in different wavelength ranges can penetrate through the filter element under different ambient brightness, so that the brightness and the color gamut can be adjusted. Therefore, the scheme can meet the requirements of different brightness and color gamut.

Description

Adjusting method of filter element, light source device and projection equipment

Technical Field

The application relates to the technical field of display, in particular to a method for adjusting a filter element, a light source device and projection equipment.

Background

A projection device is a device that can project an image or video onto a curtain or wall surface. In the use of projection devices (such as projectors, laser televisions, etc.), it is often necessary to adjust the brightness and color gamut of the display device according to various factors such as ambient light, temperature, preferences of different people, etc. How to better realize the adjustment of the brightness and the color gamut of the display device is an urgent problem to be solved.

Disclosure of Invention

The application provides a method for adjusting a filter element, a light source device and a projection device, which can meet the requirements of different brightness and color gamut.

The application provides a method for adjusting a filter element, which comprises the following steps:

obtaining the ambient brightness;

determining a filter factor according to the ambient brightness;

determining spectral information corresponding to the filter element according to the filter factor;

determining a target voltage corresponding to the filter element according to the spectrum information;

and adjusting the transmission spectrum of the filter element by adopting the target voltage so as to enable light corresponding to the spectrum information to transmit through the filter element.

In some embodiments, the filter element is adapted for use in a light source device, and the filter factor is determined based on ambient brightness, including:

acquiring a transmittable light wavelength range of the light filtering element and an adjustable brightness range of the light source device;

determining a brightness factor according to the adjustable brightness range and the ambient brightness;

the filter factor is determined based on the brightness factor and the transmissive light wavelength range.

In some embodiments, obtaining ambient brightness comprises:

periodically collecting brightness information of ambient light;

determining a current luminance difference between the luminance information of the ambient light at the previous time and the luminance information of the ambient light at the current time;

and when the current brightness difference is larger than or equal to a first preset brightness difference threshold value, determining the ambient brightness according to the brightness information of the ambient light at the previous moment or the current moment.

In some embodiments, determining the ambient brightness from the brightness information of the ambient light at the previous time comprises:

determining a plurality of target brightness differences between the brightness information of a plurality of ambient lights collected within a preset time period after the current moment and the brightness information of the ambient light at the previous moment;

if the number of the target brightness differences which are greater than or equal to the first preset brightness difference threshold value in the plurality of target brightness differences is greater than or equal to the preset number threshold value, calculating to obtain the environment brightness according to the brightness information of the environment light collected in the preset time period;

and if the number of the target brightness differences which are larger than or equal to the first preset brightness difference threshold value in the plurality of target brightness differences is smaller than the preset number threshold value, returning to the step of determining the current brightness difference between the brightness information of the ambient light at the previous moment and the brightness information of the ambient light at the current moment.

In some embodiments, the filter element is adapted to be used in a light source device, and further comprises:

when the ambient brightness is greater than the maximum brightness of the light source device, updating the ambient brightness to be the maximum brightness;

when the ambient brightness is smaller than the minimum brightness of the light source device, updating the ambient brightness to be the minimum brightness;

determining a filter factor according to the ambient brightness, comprising:

and determining a filtering factor according to the updated ambient brightness.

The application provides a light source device, the light source device includes the filter element, the filter element includes a plurality of color filtering areas, include the correspondent color filter block of many colors in each color filtering area, each color corresponds to one or more of the color filter blocks;

the target color filtering block is adjusted by adopting the adjusting method of the light filtering element, the target color filtering block is any one or more color filtering blocks corresponding to any one or more colors in the color filtering blocks corresponding to the colors, and the target color filtering block is made of electrochromic materials and/or a color-changeable photosensitizer.

In some embodiments, when the target color filter block is a plurality of color filter blocks corresponding to a plurality of colors;

when the ambient brightness is less than or equal to a second preset brightness threshold value, adjusting a color filtering block corresponding to one color;

when the ambient brightness is larger than the second preset brightness threshold and smaller than the third preset brightness threshold, adjusting a plurality of color filtering blocks corresponding to one color;

and when the ambient brightness is greater than a third preset brightness threshold value, adjusting a plurality of color filtering blocks corresponding to the plurality of colors.

In some embodiments, the color filter blocks corresponding to the multiple colors include color filter blocks corresponding to red, green or yellow, and blue, the green or yellow corresponds to one or two color filter blocks, and the target color filter block is one or two of the two color filter blocks corresponding to the green or yellow;

or the color filter blocks corresponding to the multiple colors comprise color filter blocks corresponding to red, green, blue and yellow, and the target color filter block is a color filter block corresponding to green and/or a color filter block corresponding to yellow.

In some embodiments, when green or yellow corresponds to the two color filter blocks, the two color filter blocks corresponding to green or yellow are diagonally arranged.

The application provides a projection device comprising the filter element.

The present application further provides a computer-readable storage medium storing a plurality of instructions adapted to be loaded by a processor to perform the steps of any of the methods for tuning a filter element provided herein.

In the present application, ambient brightness is obtained; determining a filter factor according to the ambient brightness; determining spectral information corresponding to the filter element according to the filter factor; determining a target voltage corresponding to the filter element according to the spectrum information; and adjusting the transmission spectrum of the filter element by adopting the target voltage so as to enable light corresponding to the spectrum information to transmit through the filter element. In this application, the target voltage is determined through the ambient brightness, the filtering characteristic of the filter element can be adjusted by adopting the target voltage, and light in different wavelength ranges can penetrate through the filter element under different ambient brightness, so that the brightness and the color gamut can be adjusted. Therefore, the scheme can meet the requirements of different brightness and color gamuts.

Drawings

In order to more clearly illustrate the technical solutions in the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without inventive work.

FIG. 1 is a schematic flow chart of a method for adjusting a filter element provided herein;

fig. 2 is a schematic structural diagram of a light source device provided in the present application;

FIG. 3 is a schematic structural diagram of a filter element provided herein;

fig. 4 is a schematic structural diagram of a projection apparatus provided in the present application.

Detailed Description

In the following, the technical solutions in the present application will be clearly and completely described with reference to the drawings in the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The application provides a method for adjusting a filter element, a light source device and a projection device.

The following are detailed below. The numbers in the following examples are not intended to limit the order of preference of the examples.

In this embodiment, a method for adjusting a filter element is provided, and as shown in fig. 1, a specific flow of the method for adjusting a filter element may be as follows:

110. and acquiring the ambient brightness.

In some embodiments, obtaining the ambient brightness may include:

(1) Luminance information of ambient light is periodically collected. The brightness information of the ambient light can be represented by information such as brightness value, light intensity value, luminous flux, illuminance value, etc. The brightness information of the ambient light can be collected by the photosensitive module with the time duration of delta t as a period.

(2) A current luminance difference between the luminance information of the ambient light at the previous time and the luminance information of the ambient light at the current time is determined.

(3) And when the current brightness difference is larger than or equal to a first preset brightness difference threshold value, determining the ambient brightness according to the brightness information of the ambient light at the previous moment or the current moment. The first preset brightness difference threshold value can be set according to the actual application situation.

Alternatively, the ambient brightness may be directly calculated from the brightness information of the ambient light at the current time.

Alternatively, the average value, the standard deviation, and the like of the brightness may be calculated as the ambient brightness according to the brightness information of the plurality of ambient lights collected within a preset time period after the current time. The preset time period can be customized according to practical application conditions, such as 30 seconds, 1 minute and 2 minutes.

Optionally, a plurality of target brightness differences between the brightness information of the plurality of ambient lights collected within a preset time period after the current time and the brightness information of the ambient light at the previous time may be determined; if the number of the target brightness differences which are greater than or equal to the first preset brightness difference threshold value in the plurality of target brightness differences is greater than or equal to the preset number threshold value, calculating to obtain the environment brightness according to the brightness information of the environment light collected in the preset time period; and if the number of the target brightness differences which are larger than or equal to the first preset brightness difference threshold value in the plurality of target brightness differences is smaller than the preset number threshold value, returning to the step of determining the current brightness difference between the brightness information of the ambient light at the previous moment and the brightness information of the ambient light at the current moment. The preset number threshold may be set in a user-defined manner according to an actual application situation, for example, the preset number threshold may be set to ninety-five percent, ninety-eight percent, and the like of the number of the brightness information of the ambient light collected in the preset time period.

For example, the brightness value L of the ambient light is periodically collected through the time length of Δ t of the photosensitive module, and the current brightness difference between the brightness values of the two adjacent ambient lights (the brightness value of the ambient light at the previous time and the brightness value of the ambient light at the current time) is calculated to be Δ L; if Δ L is smaller than the first preset luminance difference threshold Thresh1, the current luminance difference between the luminance values of the adjacent two times of ambient light is continuously calculated as Δ L.

If Δ L is greater than or equal to the first preset luminance difference threshold Thresh1, a Timer1 is started, the timing duration of the Timer1 is set to a preset time period (e.g., 30 seconds), and the Timer1 may be a multiple of Δ t.

During the time 1 operation period (i.e., within the preset time period), a plurality of target brightness differences Δ L between the brightness value of the ambient light at the last time instant and the collected brightness values of the plurality of ambient lights are calculated _o (ii) a If a plurality of Δ L _o Is greater than or equal to Δ L of the first preset luminance difference threshold Thresh1 _o And if the number is smaller than the preset number threshold m, stopping and resetting the timer1, and continuously calculating the current brightness difference between the brightness values of the two adjacent ambient lights to be delta L.

If a plurality of Δ L _o Is greater than or equal to Δ L of the first preset luminance difference threshold Thresh1 _o If the number is greater than the preset number threshold m, the ambient brightness L can be calculated by the following formula _f ：

Or

Wherein N represents the number of brightness values of the ambient light collected within a preset time period; l is _i Representing the luminance value of the i-th collected ambient light.

In some embodiments, the ambient brightness may be determined according to brightness information of the ambient light acquired in real time.

In some embodiments, the filter element is suitable for the light source device, and after obtaining the ambient brightness, when the ambient brightness is greater than the maximum brightness Lmax of the light source device, the ambient brightness can be updated to the maximum brightness L _f = Lmax; when the ambient brightness is less than the minimum brightness Lmin of the light source device, the ambient brightness is updated to the minimum brightness L _f = Lmin. Thereby to L _f The correction can avoid the brightness which is required to be adjusted from exceeding the capability of the light source device.

120. And determining a filter factor according to the ambient brightness.

In some embodiments, the filter element is suitable for the light source device, and can acquire a transmissive wavelength range of the filter element and an adjustable brightness range of the light source device. For example, a transmissive optical wavelength range (WL _ y, WL _ g), an adjustable luminance range (Lmax, lmin). Determining a brightness factor according to the adjustable brightness range and the ambient brightness; and determining a filter factor according to the brightness factor and the transmittable light wavelength range. The filter factor F can be calculated, for example, using the following equation:

F＝(WL_y-WL_g)*(Lf-Lmin)/(Lmax-Lmin)

wherein WL _ y represents the maximum value of the transmittable light wavelength of the filter element, and WL _ g represents the minimum value of the transmittable light wavelength of the filter element.

130. And determining the spectral information corresponding to the filter element according to the filter factor.

For example, the spectral information may be represented by peaks in the spectrum, and the spectral information Twl corresponding to the filter element may be calculated by using the minimum value of the transmissive light wavelength of the filter element and the filter factor, as shown in the following formula:

Twl＝WL_g+F

140. and determining the target voltage corresponding to the filter element according to the spectral information.

The mapping relation between the transmission spectrum of the filter element and the voltage can be obtained, and the target voltage corresponding to the spectrum information can be determined according to the mapping relation. For example, the target voltage U1 can be calculated using the following formula:

U1＝Twl*v1*U0

wherein U0 represents a voltage value corresponding to a transmission spectrum of primary light (red light, green light, or blue light); v1 represents the conversion coefficient.

150. And adjusting the transmission spectrum of the filter element by adopting the target voltage so as to enable light corresponding to the spectrum information to transmit through the filter element.

For example, the driving circuit corresponding to the filter element may be controlled to provide the target voltage to the filter element.

In this embodiment, the target voltage is determined by the ambient brightness, and the filter characteristic of the filter element may be adjusted by using the target voltage, so that light in different wavelength ranges can pass through the filter element under different ambient brightness, thereby adjusting the brightness and the color gamut. Therefore, the scheme can meet the requirements of different brightness and color gamut.

In the present embodiment, there is provided a light source device including the filter element 5. For example, as shown in fig. 2, the light source device includes a light source 1, a focusing element 2, a light uniformizing element 3, a spatial light modulator 4, a filter element 5, a driving circuit 6, and an optical lens 7. Wherein the drive circuit 6 is used to provide the filter element 5 with a target voltage to adjust the transmission spectrum of the filter element 5. The light source 1 may be a laser light source or an LED light source, etc.; the spatial light modulator 4 may be a Liquid Crystal Device (LCD).

The filter element 5 includes a plurality of filter regions, each filter region including filter blocks corresponding to a plurality of colors, each color corresponding to one or more filter blocks. The method for adjusting the light filtering element in fig. 1 is adopted to adjust a target color filtering block, wherein the target color filtering block is any one of the color filtering blocks corresponding to multiple colors or any one or more color filtering blocks corresponding to multiple colors, and the target color filtering block is made of electrochromic materials and/or a color-changeable photosensitizer. That is, when the drive circuit 6 is used to supply the target voltage to the filter element 5, the target voltage is supplied to the target color filter block so that the light corresponding to the spectral information passes through the target voltage.

Optionally, the color filter blocks corresponding to the multiple colors include color filter blocks corresponding to red, green, yellow or blue, the green or yellow corresponds to one or two color filter blocks, and the target color filter block is one or two of the two color filter blocks corresponding to the green or yellow;

optionally, the color filter blocks corresponding to the multiple colors include color filter blocks corresponding to red, green, blue and yellow, and the target color filter block is a color filter block corresponding to green and/or a color filter block corresponding to yellow.

Optionally, when green or yellow corresponds to the two color filter blocks, the two color filter blocks corresponding to green or yellow are arranged diagonally.

For example, as shown in fig. 3, which is a schematic structural diagram of the filter element 5, the filter element 5 includes a plurality of filter regions, each filter region includes filter blocks (R, G, and B) corresponding to red, green, and blue, the green corresponds to two filter blocks G, the two filter blocks G corresponding to the green are arranged in a diagonal direction, and the target filter block is one or two of the two filter blocks corresponding to the green.

In some embodiments, when the target color filter block is a plurality of color filter blocks corresponding to a plurality of colors; when the ambient brightness is less than or equal to a second preset brightness threshold value, adjusting a color filtering block corresponding to one color; when the ambient brightness is larger than the second preset brightness threshold and smaller than a third preset brightness threshold, adjusting a plurality of color filtering blocks corresponding to one color; and when the ambient brightness is greater than a third preset brightness threshold value, adjusting a plurality of color filtering blocks corresponding to the plurality of colors. The second preset brightness threshold and the third preset brightness threshold can be set in a user-defined mode according to practical application conditions.

For example, each color filter region of the filter element comprises three color filter blocks of R, G and B, wherein the G color filter block is set as a target color filter block; when the ambient light becomes bright, the transmission spectrum of the target filtering block can be changed from a green spectrum to a yellow spectrum by the adjusting method of the filtering element, so that the brightness is increased, and stepless change is realized; when the ambient light becomes dark, the transmission spectrum of the target color filtering block is changed from a yellow spectrum to a green spectrum, the color gamut coverage rate is enhanced while the brightness requirement is met, and the user impression is improved.

For example, each color filter region of the filter element comprises four color filter blocks of R, G and B; two of the G filter blocks are set as target filter blocks, and the two target filter blocks can be synchronously adjusted by the adjusting method of the filter elements. Different conditions can also be set, and the adjustment can be performed in series. For example, the ambient brightness is within Lmax, only one G filter color block is adjusted to reach more than Lmax, and after the first G filter color block is adjusted to the limit, the second G filter color block is adjusted.

Alternatively, the spatial light modulator 4 may also be a digital micro mirror device (DMD), a Liquid Crystal On Silicon (LCOS), or the like; the spatial Light modulator has a corresponding driving chip, for example, the Digital micromirror device can be driven by a Digital Light Processing (DLP) element.

In this embodiment, the target voltage is determined by the ambient brightness, and the target voltage may be used to adjust the filter characteristic of the filter element in the light source device, so that light in different wavelength ranges generated by the light source in the light source device can pass through the filter element under different ambient brightness, thereby adjusting the light output brightness and the color gamut of the light source device. Therefore, the light source device provided by the embodiment can meet the requirements of different brightness and color gamut.

The present application also provides a projection device, for example, as shown in fig. 2, which shows a schematic structural diagram of the projection device related to the present application.

In some embodiments, the projection device may include an image processor 201 and a light source arrangement 202. Wherein:

the image processor 201 may be a Microcontroller, a dedicated image processing chip, etc., and the Microcontroller may be an ARM chip, a Micro Controller Unit (MCU), etc.; the dedicated Image Processing chip may be an Image Signal Processing (ISP), a Graphics Processing Unit (GPU), an embedded neural network unit (NPU), or the like. The image processor 201 may be used for video decoding, image quality processing, and the like.

The light source device 202 may be a light source device as shown in fig. 2.

In some embodiments, the projection device also includes a central controller 203 of one or more processing cores, which may be a CPU, ARM, MCU, or the like controller. The central controller 203 is a control center of the projection device, and may run or execute software programs and/or operating systems stored in the memory 204 and call up data stored in the memory 204 by connecting various parts of the entire projection device using various interfaces and lines.

In some embodiments, the projection device also includes one or more computer-readable storage media of memory 204, input module 205, and communications module 206, power supply 207, and the like. Those skilled in the art will appreciate that the projection device configuration shown in fig. 2 does not constitute a limitation of the projection device and may include more or fewer components than shown, or some components may be combined, or a different arrangement of components. Wherein:

the memory 204 may be used to store a software program and an operating system, and the central controller 203 executes various functional applications and data processing by running the software program and the operating system stored in the memory 204. The memory 204 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data created according to use of the projection apparatus, and the like. Further, the memory 204 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device. Accordingly, memory 204 may also include a memory controller to provide central controller 203 access to memory 204.

The projection device may also include an input module 205. The input module 205 may be used to receive input numeric or character information and generate remote control, keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.

The projection device may also include a communication module 206, and in some embodiments communication module 206 may include a wireless module, and the projection device may perform short-range wireless transmissions via the wireless module of communication module 206 to provide wireless broadband internet access to the user. For example, the communication module 206 may be used to assist a user in accessing streaming media and the like.

The projection device also includes a power supply 207 for supplying power to the various components, and in some embodiments, the power supply 207 may be logically connected to the central controller 203 via a power management system, such that the power management system may manage charging, discharging, and power consumption. The power supply 207 may also include any component of one or more dc or ac power sources, recharging systems, power failure detection circuitry, power converters or inverters, power status indicators, and the like.

In some embodiments, central controller 203 may run or execute software programs and/or operating systems stored in memory 204 to implement various functional applications, such as:

obtaining the ambient brightness;

determining a filter factor according to the ambient brightness;

In some embodiments, obtaining ambient brightness comprises:

periodically collecting brightness information of ambient light;

determining a plurality of target brightness differences between the brightness information of a plurality of ambient lights collected within a preset time period after the current time and the brightness information of the ambient light at the previous time;

In some embodiments, the filter element is suitable for a light source device, and after obtaining the ambient brightness, the filter element further includes:

determining a filter factor according to the ambient brightness, including:

and determining a filter factor according to the updated ambient brightness.

The above operations can be implemented in the foregoing embodiments, and are not described in detail herein.

From the above, the projection device may determine the target voltage according to the ambient brightness, and may adjust the filter characteristic of the filter element by using the target voltage, so that the light in different wavelength ranges can pass through the filter element under different ambient brightness, thereby adjusting the brightness and the color gamut. Therefore, the scheme can meet the requirements of different brightness and color gamut.

It will be understood by those skilled in the art that all or part of the steps of the methods of the above embodiments may be performed by instructions, or by instructions controlling associated hardware, which may be stored in a computer-readable storage medium and loaded and executed by a processor.

To this end, the present application provides a computer-readable storage medium having stored therein a plurality of instructions that can be loaded by a processor to perform the steps of any of the methods of tuning a filter element provided herein. For example, the instructions may perform the steps of:

obtaining the ambient brightness;

determining a filter factor according to the ambient brightness;

Wherein the storage medium may include: read Only Memory (ROM), random Access Memory (RAM), magnetic or optical disks, and the like.

According to an aspect of the application, a computer program product or computer program is provided, comprising computer instructions, the computer instructions being stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the adjusting method of the filter element provided in the above embodiment.

Since the instructions stored in the storage medium can execute the steps of any of the methods for adjusting a filter element provided in the present application, the beneficial effects that can be achieved by any of the methods for adjusting a filter element provided in the present application can be achieved, and the details are not described in the foregoing embodiments.

The foregoing detailed description has provided a method for adjusting a filter element, a light source device, a projection apparatus, and a computer-readable storage medium, and specific examples have been applied herein to illustrate the principles and implementations of the present application, which are merely provided to assist understanding of the method and its core concepts of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manner and the application scope may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A method of adjusting a filter element, the method comprising:

obtaining the ambient brightness;

determining a filtering factor according to the environment brightness;

determining the spectral information corresponding to the filter element according to the filter factor;

and adjusting the transmission spectrum of the filter element by adopting the target voltage so as to enable light corresponding to the spectrum information to penetrate through the filter element.

2. A method of adjusting a filter element according to claim 1, wherein the filter element is adapted for use in a light source device, and the determining a filter factor based on the ambient brightness comprises:

determining a brightness factor according to the adjustable brightness range and the environment brightness;

and determining a filter factor according to the brightness factor and the transmittable light wavelength range.

3. The method of adjusting a filter element according to claim 1, wherein said obtaining ambient brightness comprises:

periodically collecting brightness information of ambient light;

4. The method of adjusting a filter element according to claim 3, wherein said determining the ambient brightness based on the brightness information of the ambient light at the previous time comprises:

determining a plurality of target brightness differences between the brightness information of the plurality of ambient lights collected within a preset time period after the current time and the brightness information of the ambient light at the previous time;

if the number of the target brightness differences which are greater than or equal to the first preset brightness difference threshold value in the plurality of target brightness differences is greater than or equal to a preset number threshold value, calculating to obtain the ambient brightness according to the brightness information of the ambient light collected in the preset time period;

and if the number of the target brightness differences which are greater than or equal to the first preset brightness difference threshold value in the plurality of target brightness differences is smaller than a preset number threshold value, returning to the step of determining the current brightness difference between the brightness information of the ambient light at the previous moment and the brightness information of the ambient light at the current moment.

5. The method of adjusting a filter element according to claim 3, wherein the filter element is adapted to a light source device, and further comprises, after acquiring the ambient brightness:

when the ambient brightness is larger than the maximum brightness of the light source device, updating the ambient brightness to be the maximum brightness;

determining a filter factor according to the ambient brightness, including:

and determining a filtering factor according to the updated ambient brightness.

6. A light source device is characterized by comprising a filter element, wherein the filter element comprises a plurality of filter regions, each filter region comprises a plurality of filter blocks corresponding to a plurality of colors, and each color corresponds to one or more filter blocks;

adjusting a target color filter block by using the adjusting method of the filter element according to any one of claims 1 to 5, wherein the target color filter block is any one or more color filter blocks corresponding to any one or more colors of the color filter blocks corresponding to the plurality of colors, and the target color filter block is made of electrochromic materials and/or a color-changeable photosensitizer.

7. The filter element of claim 6, wherein the target filter block is a plurality of filter blocks corresponding to a plurality of colors;

when the ambient brightness is less than or equal to a second preset brightness threshold, adjusting a color filtering block corresponding to one color;

8. The filter element according to claim 6, wherein the color filter blocks corresponding to the plurality of colors include a color filter block corresponding to red, green, or yellow, or blue, the green or yellow corresponds to one or two color filter blocks, and the target color filter block is one or two of the two color filter blocks corresponding to the green or yellow;

or the color filter blocks corresponding to the multiple colors comprise color filter blocks corresponding to red, green, blue and yellow, and the target color filter block is the color filter block corresponding to the green and/or the color filter block corresponding to the yellow.

9. A method for adjusting a filter element according to claim 6, wherein said green or yellow color filter blocks are arranged diagonally with respect to said two filter blocks.

10. A projection device, characterized in that the projection device comprises a filter element according to claim 6.