Mixed light source time sequence projection system
By using a hybrid light source time-sequential projection system, which utilizes electrochromic devices and time-sequential switching of different wavelength beams, the problem of balancing brightness and color gamut in projection devices is solved, achieving a projection effect with high chroma and high brightness.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU JIUTIAN HUAXIN TECH CO LTD
- Filing Date
- 2025-03-05
- Publication Date
- 2026-04-24
AI Technical Summary
Existing projection devices struggle to balance brightness and color gamut, resulting in a narrow range of applications, an inability to meet the needs of different application scenarios, and a negative impact on user experience.
A hybrid light source sequential projection system is adopted, which utilizes different wavelength beams of the first and second light source groups and an electrochromic device. Through the transmission and reflection characteristics of the electrochromic device, the sequential switching and light combining of the beams are realized, thereby expanding the color gamut and improving the brightness.
Without changing the color wheel and dimming elements, high saturation and high brightness projection effects are achieved by supplementing the color gamut and increasing brightness, thus expanding the color gamut range and improving the user experience.
Smart Images
Figure CN224163885U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pixel display technology, and in particular to a hybrid light source time-sequential projection system. Background Technology
[0002] In projection display products, the projection light source is a crucial component. Projectors are increasingly used in daily life and work, and different scenarios have different requirements for the projected image effect. The main approach is to mix light of different colors, angles, brightness, and shapes and output them in parallel to form a uniform spot of mixed colors that illuminates the effective area of the display chip. Moreover, in projection scenarios where the main purpose is to play video media, the color gamut is even more important and strongly affects the image quality seen by the user.
[0003] However, it is difficult to balance brightness and color gamut. Existing projection devices are not adjustable and can only have a single mode. Either the brightness is strong but the color gamut is narrow, or the brightness is slightly weak but the color gamut is wide. This results in a narrow range of applications for projection devices, which cannot adapt to the needs of different application scenarios and affects the user experience. Utility Model Content
[0004] The purpose of this invention is to propose a hybrid light source sequential projection system that can supplement the color gamut and achieve high brightness by using two beams of the same color but different spectra to supplement light without changing the color wheel and dimming elements.
[0005] The purpose of this utility model is to achieve a hybrid light source time-series projection system through the following technical solution, including a first light source group, a second light source group, and an electrochromic device;
[0006] The emitted beams of the first light source group and the second light source group are perpendicular to each other, and the beams of the first light source group and the beams of the second light source group have different wavelength ranges.
[0007] The electrochromic device is disposed in the light path of the first light source group and the second light source group, and is at a 45-degree angle to the direction of the light speed of the first light source group and the second light source group, for transmitting the light beam of the first light source group and reflecting the light beam of the second light source group.
[0008] Furthermore, the electrochromic device is energized to adjust the transmission and reflection bands.
[0009] Furthermore, the first light source group emits a first wavelength light and a second wavelength light sequentially, and the second light source group emits a third wavelength light and a fourth wavelength light sequentially; the electrochromic element switches between transmitting the first wavelength light or the second wavelength light according to a preset timing sequence, while simultaneously reflecting the third wavelength light or the fourth wavelength light.
[0010] The first wavelength light and the fourth wavelength light are combined by an electrochromic device.
[0011] Furthermore, the first light source group includes an LED light source group and a light combining component. The LED light source group emits a fourth wavelength light and a fifth wavelength light in sequence, and the light combining component is disposed between the LED light source group and the output light path of the electrochromic device.
[0012] Furthermore, the light combining component includes a first focusing lens, a second focusing lens, and a light homogenizing element;
[0013] The light beam from the LED light source group passes through the first focusing lens and the second focusing lens in sequence to obtain a focused beam, and the focused beam is then irradiated onto the electrochromic device through a light homogenizer.
[0014] Furthermore, the second light source group includes a first laser light source, a second excitation light source, a beam splitter, and a wavelength conversion device;
[0015] The first laser source is used to generate a fourth wavelength light; the second excitation source is used to generate excitation light; the wavelength conversion device is used to generate a first stimulated light under the irradiation of the excitation light, the first stimulated light being a third wavelength light; the beam splitter is used to reflect the fourth wavelength light and the excitation light, and transmit the third wavelength light.
[0016] Furthermore, the second light source group also includes a third focusing lens, which is disposed in the optical path from the first excited light to the beam splitter.
[0017] Furthermore, the beam splitter is a dichroic mirror, and the wavelength conversion device is a color wheel.
[0018] Further, the first wavelength light includes light with a wavelength of 580nm to 640nm; the second wavelength light includes light with a wavelength of 420nm to 480nm; the third wavelength light includes light with a wavelength of 500nm to 600nm; and the fourth wavelength light includes light with a wavelength of 640nm to 660nm.
[0019] This utility model has the following advantages:
[0020] This invention utilizes an electrochromic device to reversibly change the optical properties of materials, thereby meeting the need for transmission and reflection of different wavelength ranges at different times. The sequential colored light from the first light source group is absorbed after being incident on the electrochromic device, which can also effectively filter each color light. The light emitted to the lens is only the color light of the preset wavelength band, which can effectively improve the purity of the color light and thus expand the color gamut.
[0021] This invention incorporates a second light source group that emits a fourth wavelength light and a third wavelength light. The fourth wavelength light is of the same color but a different wavelength band than the first wavelength light, and it can supplement the red light in the wavelength range of xxnm~xxnm, thereby supplementing the color gamut of the red light emitted by traditional LEDs. The third wavelength light, after being displayed in sequence with the second and first wavelength lights, forms a color image. Simultaneously, the second light source group supplements the light from the first light source group, which can improve the brightness, thus achieving the requirements of high brightness and high chroma. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the projection system structure according to Embodiment 1 of this utility model;
[0023] Figure 2 This is a schematic diagram of the projection system structure according to Embodiment 2 of this utility model. Detailed Implementation
[0024] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.
[0025] It should be noted that the orientation or positional relationship indicated by terms such as "left" and "right" is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this utility model is usually placed in during use, or the orientation or positional relationship that is commonly understood by those skilled in the art. Such terms are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0026] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.
[0027] Currently, a common method for light combining involves two different light sources incident perpendicularly onto two different surfaces of optical elements such as dichroic mirrors or light combiners. The beam from one source is transmitted, while the beam from the other is reflected, causing the light paths of the two beams to overlap, thus achieving light combining. However, this method is only suitable for two different colors of light. Furthermore, for time-sequential projection systems, only one color of light illuminates the effective area of the display chip at a time, eliminating the need for light combining of different colors. For light source elements such as dichroic mirrors, it is difficult to achieve both transmission and reflection of a beam of the same color. Therefore, this application provides a solution that can achieve light combining of the same color. Example
[0028] See Figure 1This utility model provides a hybrid light source time-series projection system, including a first light source group, a second light source group, and an electrochromic device 3; the emitted beams of the first light source group and the second light source group are perpendicular to each other, and the beams of the first light source group and the beams of the second light source group have different wavelength ranges;
[0029] The electrochromic device 3 is disposed in the light path of the first light source group and the second light source group, and is at a 45-degree angle to the direction of the light speed of the first light source group and the second light source group. It is used to transmit the light beam of the first light source group and reflect the light beam of the second light source group.
[0030] The first light source group emits a first wavelength light and a second wavelength light in sequence, and the second light source group emits a fourth wavelength light and a third wavelength light in sequence; the electrochromic element switches between transmitting the first wavelength light or the second wavelength light according to a preset time sequence, while reflecting the fourth wavelength light or the third wavelength light.
[0031] The first wavelength light and the fourth wavelength light are combined by an electrochromic device.
[0032] The electrochromic device 3 is energized to adjust the transmission and reflection wavelengths. The electrochromic device 3 is made of electrochromic material. Electrochromism refers to the stable and reversible change in the optical properties of a material, such as reflectivity, transmittance, and absorptivity, under the influence of an applied electric field. This manifests as reversible changes in color and transparency. Materials with electrochromic properties are called color-changing materials. An electrochromic device 3, similar to a dichroic mirror, is fabricated using this material. By energizing the electrochromic device 3 and adjusting the current and voltage applied to it, the desired transmission and reflection wavelengths can be adjusted.
[0033] In this embodiment, the electrochromic device 3 needs to transmit a first wavelength light and a second wavelength light according to the range of each wavelength. The first wavelength light includes light with a wavelength of 580nm~640nm; the second wavelength light includes light with a wavelength of 420nm~480nm.
[0034] While transmitting the first wavelength light, the electrochromic device 3 needs to reflect the fourth wavelength light. The fourth wavelength light includes light with a wavelength of 640nm~660nm. The fourth wavelength light and the first wavelength light are both red light of the same color, but light of different spectra. Therefore, the fourth wavelength light can be used to supplement the first wavelength light, which can increase the color gamut.
[0035] The electrochromic device 3 also needs to reflect a third wavelength of light, which includes light with a wavelength of 500nm to 600nm; the first wavelength light, the second wavelength light and the third wavelength light are irradiated onto the lens 4 in a preset sequence to obtain a color image.
[0036] Among the various light sources that can currently generate light beams, there are many types, such as laser light sources and LED light sources. However, each type of light source has its own advantages and disadvantages. For example, laser light sources are characterized by high brightness, but they are also prone to speckle when used as lighting sources; while LED light sources suffer from insufficient brightness.
[0037] Therefore, in practical applications, in order to compensate for the shortcomings of different light sources, it is necessary to use multiple light sources in combination. For example, the beam emitted by a laser light source and the beam emitted by an LED light source can be mixed so that the output beam can eliminate speckle while ensuring brightness. Of course, it is also not recommended to use two LED light source beams to increase brightness, or to use other types of light sources in combination.
[0038] The hybrid light source system provided in this embodiment is to combine the beams output by two light sources. Based on the above discussion, it is obvious that in this embodiment, the first light source group 1 uses an LED light source group and the second light source group 2 uses a laser light source group; of course, the first light source group 1 and the second light source group 2 can be either laser light source groups or LED light source groups, and they are interchangeable. This application does not impose specific restrictions on this.
[0039] The first light source group includes an LED light source group 11 and a light combining component 12. The LED light source group 12 emits a first wavelength light, a second wavelength light, and a third wavelength light sequentially. The light combining component 12 is disposed between the LED light source group 11 and the output light path of the electrochromic device 3. The light combining component 12 includes a first focusing lens 121, a second focusing lens 122, and a light homogenizer 123. The light beam from the LED light source group 12 passes through the first focusing lens 121 and the second focusing lens 122 in sequence to obtain a focused beam, and the focused beam is then irradiated onto the electrochromic device 3 by the light homogenizer 123.
[0040] The second light source group includes a first laser light source 21, a second excitation light source 22, a beam splitter 23, and a wavelength conversion device 24; the first laser light source 21 is used to generate fourth wavelength light; the second excitation light source 22 is used to generate excitation light, and the wavelength conversion device 24 is used to generate first stimulated light under the irradiation of the excitation light, which is the third wavelength light;
[0041] In this embodiment, the second excitation light source 22 is a laser light source, which is arranged opposite to the first laser light source 21. The second excitation light source 22 is a blue laser light source with a wavelength of 445nm~455nm. In this embodiment, a blue laser light source with a wavelength of 450nm is selected as the excitation light for the excitation of the third wavelength light.
[0042] During operation, the excitation light emitted by the second excitation source illuminates the beam splitter 23, which is a dichroic mirror. The beam splitter 23 guides the excitation light to the wavelength conversion device 24, which is a color wheel coated with fluorescent protein material. After receiving the blue excitation light, the color wheel excites a third wavelength light, which is 515nm~550nm. In order to make the collimation of the fluorescence of the laser, i.e. the third wavelength light, better, a third focusing lens 25 is set in the optical path from the first excited light to the beam splitter.
[0043] The third wavelength light passes through the third focusing lens 25 and then through the beam splitter 23. In this embodiment, the beam splitter 23 is a dichroic mirror, which is used to reflect the fourth wavelength light and the excitation light, and transmit the third wavelength light. That is, the transmitted wavelength is 515nm~550nm, and the reflected wavelengths are 640nm~660nm and 445nm~455nm, so that the third wavelength light is pure green. When the third wavelength light, the second wavelength light and the first wavelength light are displayed in sequence, a color image visible to the naked eye can be formed on the lens 4. Moreover, due to the filtering by the dichroic mirror, the color gamut is large and the color has no color deviation. Example
[0044] In some specific embodiments, such as Figure 2 As shown, in this embodiment, the second excitation light source 22 is an LED light source, and it is located on the same side as the wavelength conversion device 24. Therefore, the second laser light source 22 and the wavelength conversion device 24 can be closely integrated in practical applications, forming a single module (because the distance between them would be too small to be shown in the diagram, therefore...). Figure 2 (Although the diagrams are still separate,) By tightly configuring them into a single module, the consideration of beam collimation can be eliminated, thereby increasing the selection of excitation light sources, including both LED and LD light sources; furthermore, it can save space and facilitate assembly design;
[0045] In this embodiment, the second excitation light source 22 is a blue LED light source with a wavelength of 420nm~480nm. In this embodiment, a blue LED light source with a wavelength of 450nm is selected as the excitation light to excite the third wavelength light. After the second excitation light source 22 illuminates the wavelength conversion device 24, it can excite the third wavelength light with a wavelength of 500nm~600nm.
[0046] The above embodiments only illustrate preferred implementation methods, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from this utility model, and these all fall within the protection scope of this utility model.
Claims
1. A hybrid light source sequential projection system, characterized in that: Including the first light source group, the second light source group and the electrochromic device (3); The emitted beams of the first light source group and the second light source group are perpendicular to each other, and the beams of the first light source group and the beams of the second light source group have different wavelength ranges. The electrochromic device (3) is disposed on the outgoing light path of the first light source group and the second light source group, and is at a 45-degree angle to the direction of the outgoing light speed of the first light source group and the second light source group, for transmitting the light beam of the first light source group and reflecting the light beam of the second light source group.
2. The hybrid light source time-series projection system according to claim 1, characterized in that, The electrochromic device (3) is energized to adjust the transmission band and the reflection band.
3. The hybrid light source sequential projection system according to claim 2, characterized in that, The first light source group emits first wavelength light and second wavelength light in sequence, and the second light source group emits third wavelength light and fourth wavelength light in sequence; the electrochromic device (3) switches the transmission band range in sequence, and the electrochromic device (3) transmits first wavelength light or second wavelength light in sequence, while reflecting third wavelength light or fourth wavelength light. The first wavelength light and the fourth wavelength light are combined by an electrochromic device (3).
4. A hybrid light source sequential projection system according to claim 3, characterized in that, The first light source group includes an LED light source group (11) and a light combining component (12). The LED light source group (12) emits a first wavelength light and a second wavelength light in sequence. The light combining component (12) is disposed between the LED light source group (11) and the outgoing light path of the electrochromic device (3).
5. A hybrid light source sequential projection system according to claim 4, characterized in that, The light combining component (12) includes a first focusing lens (121), a second focusing lens (122), and a light homogenizer (123). The light beam of the LED light source group (12) passes through the first focusing lens (121) and the second focusing lens (122) in sequence to obtain a focused beam, and the focused beam is irradiated onto the electrochromic device (3) through the light homogenizer (123).
6. A hybrid light source sequential projection system according to claim 3, characterized in that, The second light source group includes a first laser light source (21), a second excitation light source (22), a beam splitter (23), and a wavelength conversion device (24); The first laser source (21) is used to generate fourth wavelength light; the second excitation source (22) is used to generate excitation light; the wavelength conversion device (24) is used to generate first stimulated light under the irradiation of the excitation light, the first stimulated light being third wavelength light; the beam splitter (23) is used to reflect the fourth wavelength light and the excitation light, and transmit the third wavelength light.
7. A hybrid light source sequential projection system according to claim 6, characterized in that, The second light source group also includes a third focusing lens (25), which is disposed in the optical path from the first stimulated light to the beam splitter (23).
8. A hybrid light source sequential projection system according to claim 6, characterized in that, The beam splitter (23) is a dichroic mirror, and the wavelength conversion device (24) is a color wheel.
9. A hybrid light source sequential projection system according to claim 3, characterized in that, The first wavelength light includes light with a wavelength of 580nm to 640nm; the second wavelength light includes light with a wavelength of 420nm to 480nm; the third wavelength light includes light with a wavelength of 500nm to 600nm; and the fourth wavelength light includes light with a wavelength of 640nm to 660nm.