Optical system, processing method and display device

Abstract

The invention provides an optical system, a processing method and display equipment, and is applied to the technical field of optics. The optical system comprises a light source assembly which comprises at least one light-emitting chip corresponding to three primary colors respectively, and the light-emitting chips of the same color generate monochromatic light at the same time; a display assembly including a plurality of display areas; and the first modulation assembly is provided with a plurality of modulation areas corresponding to the plurality of display areas, and different modulation areas can modulate monochromatic light of different colors so as to carry out color compensation on the corresponding display areas.

Description

Technical Field

[0001] This disclosure relates to the field of optical technology, and in particular to an optical system, processing method and display device. Background Technology

[0002] Currently, to achieve miniaturization and high light extraction efficiency, optical systems mostly employ a combination of a sequential liquid crystal on silicon (LCOS) display and a single light-emitting diode (LED) light source. The light beam emitted by a single LED light source often exhibits non-uniform spatial distribution across its light field cross-section, resulting in localized color shifts in the final image. Summary of the Invention

[0003] In view of the above, this disclosure provides an optical system, a processing method, and a display device.

[0004] According to a first aspect of this disclosure, an optical system is provided, comprising: a light source assembly including at least one light-emitting chip corresponding to each of the three primary colors, wherein light-emitting chips of the same color generate monochromatic light at the same time; a display assembly including multiple display areas; and a first modulation assembly having multiple modulation regions corresponding to the multiple display areas, wherein different modulation regions can modulate monochromatic light of different colors to perform color compensation on the corresponding display areas.

[0005] According to embodiments of this disclosure, the plurality of modulation regions includes one or more of a first modulation region, a second modulation region, and a third modulation region, wherein: the first modulation region is used to increase the phase delay of the first color light in the three primary colors to reduce the energy of the first color light received by the first display region; the first modulation region is used to increase the phase delay of the second color light in the three primary colors to reduce the energy of the second color light received by the second display region; and the first modulation region is used to increase the phase delay of the third color light in the three primary colors to reduce the energy of the third color light received by the third display region.

[0006] According to embodiments of this disclosure, the light further includes: a first conversion component for converting monochromatic light into first polarized light having a first polarization state; the first polarized light being a first color, a second color, or a third color; a first modulation region for converting the first polarized light of the first color into second polarized light of the first color having a second polarization state; a second modulation region for converting the first polarized light of the second color into second polarized light of the second color having a second polarization state; a third modulation region for converting the first polarized light of the third color into second polarized light of the third color having a second polarization state; a display component for converting the polarization state of the second polarized light to obtain third polarized light having a third polarization state; the vibration direction of the third polarization state is perpendicular to that of the second polarization state; and a second conversion component for converting the polarization state of the third polarized light to obtain first polarized light having a first polarization state.

[0007] According to embodiments of this disclosure, it further includes: a second modulation component for filtering the first polarized light that does not have a first polarization state.

[0008] According to an embodiment of this disclosure, the second conversion component includes: a phase delayer for converting the polarization state of the third polarized light to obtain the fourth polarized light having a fourth polarization state; and a light reflector for converting the polarization state of the fourth polarized light to obtain the fifth polarized light having a fifth polarization state.

[0009] According to embodiments of this disclosure, the first conversion component includes: a beam combiner for combining monochromatic light of the same color from different chips; a second polarizer for converting the combined light into sixth polarized light; and a polarization beam splitter for separating the light in the sixth polarized light according to polarization state to obtain first polarized light.

[0010] According to an embodiment of this disclosure, third polarized light is transmitted from a polarization beam splitter and incident on a phase delayer; fourth polarized light is reflected by the polarization beam splitter and incident on a first polarizer.

[0011] According to embodiments of this disclosure, the phase delayer includes a quarter-wave plate.

[0012] A second aspect of this disclosure provides a processing method applied to an optical system, the system comprising: a light source assembly including at least one light-emitting chip corresponding to each of the three primary colors, wherein light-emitting chips of the same color generate monochromatic light at the same time; and a display assembly including multiple display areas; the method comprising: determining color information of the light source assembly in the multiple display areas, wherein the light source assembly includes at least one light-emitting chip corresponding to each of the three primary colors, wherein light-emitting chips of the same color generate monochromatic light at the same time; and determining multiple modulation areas in a first modulation assembly based on the color information, wherein the multiple modulation areas correspond one-to-one with the multiple display areas, and different modulation areas can modulate monochromatic light of different colors to perform color compensation on the corresponding display areas.

[0013] A third aspect of this disclosure provides a display device, comprising: an optical system, the optical system including: a light source assembly including at least one light-emitting chip corresponding to each of the three primary colors, wherein light-emitting chips of the same color generate monochromatic light at the same time; a display assembly including multiple display areas; a first modulation assembly having multiple modulation regions corresponding to the multiple display areas, wherein different modulation regions can modulate monochromatic light of different colors to perform color compensation on the corresponding display areas; and an imaging device for imaging monochromatic light emitted in a time sequence.

[0014] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0015] The above and other objects, features and advantages of this disclosure will become clearer from the following description of embodiments with reference to the accompanying drawings, in which:

[0016] Figure 1 An optical path diagram of an optical system according to an embodiment of the present disclosure is schematically shown;

[0017] Figure 2 A schematic diagram illustrating the principle of monochromatic light modulation according to an embodiment of the present disclosure is shown.

[0018] Figure 3 This schematic diagram illustrates the optical path modulation principle of a second modulation component according to an embodiment of the present disclosure;

[0019] Figure 4 A schematic diagram illustrating the optical path modulation principle of an optical system according to an embodiment of the present disclosure is shown.

[0020] Figure 5 A flowchart illustrating a processing method according to an embodiment of the present disclosure is shown schematically.

[0021] Figure 6 A schematic diagram of the structure of a display device according to an embodiment of the present disclosure is shown.

[0022] Figure Labels

[0023] 1. Display device;

[0024] 100. Optical system; 10. Light source assembly; 20. Display assembly; 30. First modulation assembly; 40. First conversion assembly; 41. Beam combiner; 42. Second polarizer; 43. Polarization beam splitter; 50. Second conversion assembly; 51. Phase retarder; 52. Light reflector; 60. Second modulation assembly;

[0025] A. First display area; 22. Second display area; 23. Third display area;

[0026] A', First modulation region; B', Second modulation region; C', Third modulation region;

[0027] 200. Imaging device. Detailed Implementation

[0028] The embodiments of the present disclosure will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the disclosure. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the present disclosure for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts of the present disclosure.

[0029] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The terms “comprising,” “including,” etc., as used herein indicate the presence of features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0030] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0031] When using expressions such as "at least one of A, B and C", they should generally be interpreted in accordance with the meaning that is commonly understood by those skilled in the art (e.g., "a system having at least one of A, B and C" should include, but is not limited to, a system having A alone, a system having B alone, a system having C alone, a system having A and B, a system having A and C, a system having B and C, and / or a system having A, B and C, etc.).

[0032] This disclosure provides an optical system, a processing method, and a display device. Before introducing the technical solutions provided by this disclosure, the relevant technologies involved in this disclosure will be described first.

[0033] Currently, in order to achieve miniaturization and high light extraction efficiency, most optical systems adopt a solution of sequential liquid crystal on silicon (LCOS) display screen combined with a single light-emitting diode (LED) light source.

[0034] In one example, taking a micro-projection optical system, the spatial distribution of the light beam emitted by a single LED light source on its optical field cross-section is often non-uniform, meaning that the light intensity and spectral characteristics (such as color coordinates) are not completely uniform. When this spatially non-uniform light beam directly illuminates an LCOS panel, it causes differences in brightness and color of the illumination light received by different areas of the panel. After being magnified by the projection lens, this difference ultimately manifests as significant local color casts in the projected image, severely affecting the color uniformity and overall visual experience of the image.

[0035] In related technologies, to address the aforementioned issues, one approach is to avoid using a single LED lighting scheme and instead employ a three-color LED light source with independent collimated illumination. Color mixing is then achieved using a wedge-shaped beam splitter or a color-combining prism, resulting in uniform color and brightness illumination at the LCOS display. However, independent three-color LED light sources require significantly more space, more than three times the size of a single LED, hindering product miniaturization. Another approach involves redesigning the lighting path, reducing the system's luminous efficacy, and increasing the illumination area at the LCOS display location, using only the central area with better color and brightness uniformity. However, using only the central display area reduces the system's field of view, failing to meet the initial system design specifications.

[0036] Before providing a further detailed description of the embodiments of this disclosure, the nouns and terms involved in the embodiments of this disclosure will be explained, and the nouns and terms involved in the embodiments of this disclosure shall be interpreted as follows.

[0037] A phase retarder is an optical element that allows for precise manipulation of the polarization state of light. Its principle is to create a specific, controllable phase difference between two mutually perpendicular polarization components of a light wave. An example is a quarter-wave plate (λ / 4 waveplate, QWP).

[0038] The following will be through Figures 1-5 The optical system of the present disclosure will be described in detail.

[0039] Figure 1 An optical path diagram of an optical system according to an embodiment of the present disclosure is illustrated schematically.

[0040] like Figure 1 As shown, the optical system 100 of this embodiment includes: a light source assembly 10, a display assembly 20, and a first modulation assembly 30.

[0041] The light source assembly 10 includes at least one light-emitting chip corresponding to each of the three primary colors, and at the same time, the light-emitting chips of the same color produce monochromatic light.

[0042] The display assembly 20 includes multiple display areas.

[0043] The first modulation component 30 has multiple modulation regions corresponding to multiple display areas. Different modulation regions can modulate monochromatic light of different colors to perform color compensation for the corresponding display areas.

[0044] For example, the light source component 10 can be used to provide light radiation corresponding to the three primary colors. The three primary colors can correspond to three color channels: red (R), green (G), and blue (B). Each color channel can be configured with one or more light-emitting chips, the specific number of which can be determined according to actual needs. For instance, the light source component 10 can be a package integrating a red LED chip, a green LED chip, and a blue LED chip. Alternatively, it can be a combination of three independently packaged LED beads.

[0045] The light source component 10 emits light using time-division multiplexing. At any given moment, only the light-emitting chips of the same color are active, producing monochromatic light of that color, while the light-emitting chips of other colors are off. That is, at any given moment, for a certain color channel (e.g., the red channel), its corresponding light-emitting chip outputs monochromatic light. Here, monochromatic light can be understood as a single color light with a defined center wavelength and a relatively narrow spectral width. This time-sequential light emission method allows red, green, and blue light to appear sequentially on the time axis, achieving color display through the persistence of vision effect of the human eye. For example, within one frame period, the LEDs are lit in the order R→G→B: at time t1, all red LED chips are lit simultaneously, emitting red monochromatic light, while green and blue LED chips are off; at time t2, all green LED chips are lit, while red and blue LED chips are off; at time t3, all blue LED chips are lit, while red and green LED chips are off.

[0046] Display assembly 20 can be a component used to form an image or modulate light, typically a spatial light modulator. Display assembly 20 includes multiple display areas, indicating that the display is spatially divided into multiple sections. This can be a physical partition or a logical partition. At its core, the system can identify and process the optical states at different locations on the display. For example, display assembly 20 can be an LCOS (Liquid Crystal on Silicon) liquid crystal display. Multiple display areas can be an array of millions of pixels on the display. The area containing at least one pixel can serve as a single display area.

[0047] The first modulation component 30 can be an optical modulation device located in the optical path, and its functional surface is divided into multiple modulation regions. These modulation regions correspond one-to-one in number to the multiple display regions of the display component 20, and also have a spatial correspondence. Each modulation region is responsible for modulating the light leading to the corresponding display region, realizing independent optical modulation of different display regions. Each modulation region of the first modulation component 30 has independent modulation capability and can implement different modulation parameters for monochromatic light of different colors. That is, by implementing different optical modulations on different display regions, the color differences of different regions of the display are compensated, so that the entire display presents a uniform color performance. Combining the aforementioned time-sequential light emission characteristics, when red light passes through, each modulation region can be set with different red light modulation parameters; when green light passes through, each modulation region can be set with different green light modulation parameters; when blue light passes through, each modulation region can be set with different blue light modulation parameters. For example, for light illuminating different positions on the display, the first modulation component 30 can apply different modulations according to the color (wavelength) of the light. For example, in the red light timing, the transmittance of modulation area A is set to 80% and the transmittance of modulation area B is set to 60%; in the green light timing, the transmittance of modulation area A is set to 70% and the transmittance of modulation area B is set to 90%; in the blue light timing, the transmittance of modulation area A is set to 65% and the transmittance of modulation area B is set to 75%, thereby achieving full-screen brightness uniformity compensation.

[0048] In one example, the light source component 10 includes red, green, and blue light-emitting chips, which are driven in a time-division manner so that the light output at any given time is monochromatic light of the corresponding color. The display component 20 is divided into multiple display areas. The first modulation component 30 is divided into multiple modulation areas, each corresponding to a display area. Based on the color deviation data of each display area, different modulation parameters are set for each modulation area during the red light, green light, and blue light periods to change the proportion of each color component in the corresponding display area, thereby achieving zonal color compensation and reducing regional color difference.

[0049] It is understandable that by combining temporal color sequence control (time-sequential emission of the light source component 10) and spatial partition modulation (differential modulation of the first modulation component 30), precise and independent color compensation for different areas of the display is achieved, thereby improving the overall color consistency and display quality of the display system.

[0050] As described above, in some embodiments, the multiple modulation regions include one or more of a first modulation region, a second modulation region, and a third modulation region, wherein: the first modulation region is used to increase the phase delay of the first color light in the three primary colors to reduce the energy of the first color light received by the first display region; the first modulation region is used to increase the phase delay of the second color light in the three primary colors to reduce the energy of the second color light received by the second display region; and the first modulation region is used to increase the phase delay of the third color light in the three primary colors to reduce the energy of the third color light received by the third display region.

[0051] For example, the first modulation region, the second modulation region, and the third modulation region can be functional zones with different optical characteristics on the first modulation component 30. These modulation regions are spatially independent and correspond to display areas on the display component 20 with different color deviations. Each modulation region selectively attenuates the energy of a specific color light by applying a different phase delay to it, thereby compensating for the color deviation of the corresponding display area. The phase delay can be understood as the degree of lag in the phase of the light wave relative to the incident light after passing through the modulation region. Increasing the phase delay changes the polarization state of the light. When the changed polarization state does not match the polarization filter element in the subsequent optical path, the transmittance of that color light decreases, i.e., the energy decreases.

[0052] The first, second, and third color rays can each correspond to any one of the three primary colors. For example, the first color can be red, the second color can be green, and the third color can be blue. Other permutations and combinations are also possible, and the specific color correspondence depends on the actual color deviation of each area of ​​the display. The first, second, and third display areas are areas on the display component 20 that exhibit different color shift characteristics. For example, the first display area may exhibit a reddish tint, meaning that the red component in this area is too high compared to other color components; the second display area may exhibit a greenish tint; and the third display area may exhibit a bluish tint.

[0053] The first modulation region reduces the energy of the first-color light received by the first display region by increasing the phase delay of the first-color light. Specifically, when the first-color light passes through the first modulation region with a specific polarization state, the phase delay applied to the first-color light by this region is significantly greater than the phase delay applied to other colors. This differentiated phase delay causes a significant change in the polarization state of the first-color light, for example, from linearly polarized light to elliptically polarized light. When this elliptically polarized light passes through a subsequent polarization filter element, some light energy is blocked because the polarization state no longer satisfies the transmission condition, thus achieving effective attenuation of the energy of the first-color light. In this way, the first display region, which was originally biased towards the first color, receives color compensation, its first-color component is reduced, and the color performance of this region tends to be more balanced.

[0054] The second and third modulation regions operate similarly to the first modulation region, applying differentiated phase delay modulation to the second and third color light, respectively. The second modulation region applies a larger phase delay to the second color light and a smaller phase delay to the first and third color light, thereby selectively reducing the second color component of the second display region. Similarly, the third modulation region applies a larger phase delay to the third color light and a smaller phase delay to the first and second color light, thereby selectively reducing the third color component of the third display region.

[0055] It should be noted that the first modulation component 30 may include one or more of a first modulation region, a second modulation region, and a third modulation region, and the specific configuration depends on the actual color distribution of the display component 20. If only a certain area of ​​the display has a significant color shift, only one corresponding modulation region can be set; if multiple areas have different color shift problems, multiple modulation regions can be set simultaneously. The modulation regions can be arranged continuously in space, spaced apart, or overlapped to form composite modulation regions to adapt to more complex color compensation needs.

[0056] In one example, the display component 20 is an LCOS display screen, whose effective display area is divided into a left area A, a central area C, and a right area B. Color uniformity testing revealed that the left area A exhibits a reddish tint when displaying white images, the central area C exhibits a greenish tint, and the right area B exhibits a bluish tint. To address this issue, a first modulation component 30 is placed in front of the display screen. This component includes three modulation areas: the first modulation area A' corresponds to the left area A, the second modulation area C' corresponds to the central area C, and the third modulation area B' corresponds to the right area B.

[0057] The first modulation region A' has a phase retardation of one-quarter wavelength for red light, while the phase retardation for green and blue light is less than one-tenth of a wavelength. When red sequential light is incident on the first modulation region A' in a linearly polarized state, the red light becomes elliptically polarized after passing through this region, while the green and blue light remain essentially linearly polarized. After reflection by the LCOS display and subsequent polarization filter elements, the transmittance of red light is reduced to 60% of its original value, while the transmittance of green and blue light remains essentially above 95%. In this way, the red component in the left-side region is effectively suppressed, and color deviation is compensated.

[0058] The second modulation region C' has a phase retardation of one-quarter wavelength for green light and less than one-tenth wavelength for red and blue light. When green sequential light passes through the second modulation region C', the green light becomes elliptically polarized, and its transmittance decreases to 65%, while red and blue light maintain higher transmittance. The green component in the central region is thus suppressed, and the color becomes more balanced.

[0059] The third modulation region B' has a phase retardation of one-quarter wavelength for blue light and less than one-tenth wavelength for red and green light. After passing through the third modulation region B', the blue sequential light becomes elliptically polarized, with its transmittance reduced to 70%, while red and green light maintain high transmittance. The blue component in the right-hand region is suppressed, thus resolving the color shift problem.

[0060] After the aforementioned regional modulation, the color performance of the display component 20 in the left, center, and right regions of the projected image tends to be consistent, and the overall color uniformity of the image is significantly improved. In practical applications, the phase delay of each modulation region can be finely adjusted according to the actual color deviation of each display region to achieve the best compensation effect.

[0061] In essence, by setting multiple modulation regions for different colors of light on the first modulation component 30, and making these modulation regions correspond one-to-one with the display areas on the display component 20 where color deviations exist, independent and precise modulation of different color components in different display areas is achieved. This color compensation method based on differential control of phase delay can effectively solve the local color shift problem commonly found in single-LED light source lighting systems while maintaining the overall luminous efficiency of the system, thereby improving the color consistency and display quality of the projected image.

[0062] In some embodiments, the first modulation component 30 may be a phase modulation element, which is used to increase the phase delay of different colors of light in different modulation regions.

[0063] For example, the first modulation component 30 may be a liquid crystal phase modulator, a metasurface phase modulation array, etc. This disclosure does not specifically limit the type of the first modulation component 30.

[0064] Figure 2 A schematic diagram illustrating the principle of monochromatic light modulation according to an embodiment of the present disclosure is shown.

[0065] In another embodiment, for example Figure 1 The optical system 100 shown may further include: a first conversion component 40 for converting monochromatic light into first polarized light having a first polarization state; the first polarized light being a first color, a second color, or a third color; a first modulation region for converting the first polarized light of the first color into second polarized light of the first color having a second polarization state; a second modulation region for converting the first polarized light of the second color into second polarized light of the second color having a second polarization state; a third modulation region for converting the first polarized light of the third color into second polarized light of the third color having a second polarization state; a display component for converting the polarization state of the second polarized light to obtain third polarized light having a third polarization state; the vibration direction of the third polarization state is perpendicular to that of the second polarization state; and a second conversion component 50 for converting the polarization state of the third polarized light to obtain first polarized light having a first polarization state.

[0066] For example, the first conversion component 40 may be a polarization conversion device located between the light source component 10 and the first modulation component 30, and its function is to convert the monochromatic light emitted by the light source component 10 into first polarized light with a defined polarization direction. Since the light emitted by the LED light source is usually natural light or partially polarized light, its polarization state is uncertain, so it is necessary to unify the polarization state through the first conversion component 40. The first polarization state may be a linear polarization state, and its vibration direction is along a specific direction, for example, it may be set as a P-polarization state or an S-polarization state.

[0067] The first, second, and third modulation regions respectively perform polarization state conversion on first-polarized light of different colors, converting it into second-polarized light. This second polarization state differs from the first polarization state and can be either elliptically or circularly polarized. The specific form of the second polarization state depends on the phase delay applied by each modulation region to the corresponding color light. When the first modulation region applies a quarter-wavelength phase delay to the first-polarized light of the first color, the light is converted into circularly polarized light of the first color; when the applied phase delay is not equal to a quarter-wavelength, the light is converted into elliptically polarized light of the first color. Similarly, the second modulation region converts the first-polarized light of the second color into second-polarized light of the second color, and the third modulation region converts the first-polarized light of the third color into second-polarized light of the third color. It should be noted that the phase delay for non-target color light in each modulation region is very small. These lights, after passing through the modulation region, essentially retain their first polarization state unchanged, or only undergo a slight change in polarization state, and can be approximated as still being first-polarized light.

[0068] The display component is used to convert the polarization state of the second polarized light to obtain the third polarized light. The display component can be an LCOS liquid crystal display screen, which has a polarization rotation function. When the second polarized light is incident on a pixel unit of the display component, the pixel unit modulates the polarization state of the light according to the display signal. The pixel unit rotates the polarization state of the incident second polarized light by ninety degrees to obtain the third polarized light.

[0069] The vibration directions of the third polarization state and the second polarization state are perpendicular. This perpendicularity means that if both the second and third polarization states are decomposed into linear polarization components, the vibration directions of these two linear polarization components are perpendicular to each other. For example, if the second polarized light is elliptically polarized with its major axis horizontal, then after the display component is rotated, the major axis of the third polarized light becomes vertical, and the principal vibration directions of the two are perpendicular to each other. If the second polarized light retains its first polarization state, i.e., a horizontal linear polarization state, then after the display component is rotated, the third polarized light becomes a vertical linear polarization state.

[0070] The second conversion component 50 is used to convert the polarization state of the third polarized light to obtain the first polarized light with the first polarization state. The second conversion component 50 can also convert the polarization state of the third polarized light back to the first polarization state. It should be noted that the first polarized light output by the second conversion component 50 with the first polarization state has the same polarization state as the first polarized light output by the first conversion component 40. However, because the modulation region can reduce the energy of the monochromatic light in the corresponding display area, the luminous flux of the two changes. The luminous flux of the first polarized light output by the second conversion component 50 with the first polarization state is less than that output by the first conversion component 40 with the first polarization state.

[0071] In one example, refer to Figure 2 Continuing with the example of an LCOS liquid crystal display, the complete optical path of this system includes a light source component 10, a first conversion component 40, a first modulation component 30, a display component, and a second conversion component 50. During the red timing period, the red chip is lit, emitting red monochromatic light with a center wavelength of 630nm. This red light first enters the first conversion component 40, whose transmission axis is set to horizontal. After passing through the first conversion component 40, the red monochromatic light is converted into red first polarized light with a horizontal vibration direction, and at this time, the light is in the first polarization state.

[0072] As the first red polarized light continues to propagate, it passes through the first modulation region of the first modulation component 30. Because the phase delay of the red light in the first modulation region is set to one-eighth of the wavelength, the first red polarized light transforms into elliptically polarized light, with its polarization state becoming the second polarization state. When the first red polarized light passes through the second and third modulation regions, because the phase delay of the red light in these two regions is very small, approximately one-twentieth of the wavelength, the red light essentially maintains its first polarization state. Subsequently, the red light is incident on the LCOS display screen. The left side of the LCOS display screen receives the elliptically polarized red light in the second polarization state, while the central and right sides receive the linearly polarized red light in the first polarization state.

[0073] The LCOS display modulates the polarization state of the incident light. For elliptically polarized red light in the second polarization state, the display rotates its polarization state by 90 degrees to obtain elliptically polarized red light in the third polarization state, which is perpendicular to the major axis of the second polarization state. For linearly polarized red light in the first polarization state, the display rotates its vibration direction by 90 degrees, changing it from horizontal to vertical, to obtain linearly polarized red light in the third polarization state, which is perpendicular to the vibration direction of the first polarization state. After reflection by the display, the red light leaves the display and enters the second conversion component 50.

[0074] The second conversion component 50 receives red light with a third polarization state and, through an internal polarization state conversion mechanism, converts this third polarization light back into first polarization light with a first polarization state. Similarly, the converted red, green, and blue first polarization light continue to propagate in the optical path and eventually form an image. Because the red light in the left region, the green light in the central region, and the blue light in the right region undergo a conversion from the first polarization state to the second polarization state and then to the third polarization state during modulation, their polarization state change paths are different from those of the light in other regions. Therefore, they exhibit lower transmittance in the subsequent polarization filtering stage, thereby achieving selective attenuation of the corresponding color components in these regions.

[0075] It is understandable that by introducing the first conversion component 40 and the second conversion component 50 into the optical system 100, and combining the partition modulation function of the first modulation component 30 and the polarization rotation function of the display component, precise polarization state control of light throughout the entire optical path is achieved. This multi-level polarization state conversion mechanism allows light of different colors to undergo differentiated polarization state change paths in different display areas, creating conditions for subsequent polarization filtering and energy modulation. This effectively compensates for local color shift problems in single-LED light source illumination systems, improving the color uniformity and overall display quality of the projected image.

[0076] Figure 3 The diagram illustrates the optical path modulation principle of the second modulation component 60 according to an embodiment of the present disclosure.

[0077] In another embodiment, for example Figure 1 The optical system 100 shown may further include a second modulation component 60 for filtering first polarized light that does not have a first polarization state.

[0078] For example, the second modulation component 60 may be a polarization filter located after the second conversion component 50. Its function is to filter the polarization state of the light output from the second conversion component 50, allowing only first-polarized light with a first polarization state to pass through, while blocking or absorbing light without a first polarization state. Here, first-polarized light without a first polarization state refers to light that should nominally be converted to the first polarization state, but whose polarization state differs from the ideal first polarization state due to incomplete or deviated polarization state conversion during the preceding modulation process. These rays may still maintain a second or third polarization state, or be in an intermediate state between different polarization states. The second modulation component 60 selects the polarization of the incident light by setting the transmission axis direction corresponding to the first polarization state, allowing only light with a vibration direction consistent with or close to the transmission axis direction to pass through, while light with other polarization directions is blocked.

[0079] More importantly, the second modulation component 60 plays a crucial role in the color compensation mechanism. In each modulation region of the first modulation component 30, the first modulation region applies a large phase delay to the first color light, allowing it to fully transform into a second polarization state; while the phase delay applied to the second and third color light is very small, and these light rays essentially maintain their first polarization state. After passing through the display component and the second conversion component 50, the first color light, originally in the second polarization state, is converted back to the first polarization state. However, due to the multiple polarization state conversions it has undergone, its polarization state differs from other color light rays that directly maintain the first polarization state. Specifically, the vibration direction of the first color light after multiple conversions may have a certain deflection angle from the ideal first polarization state direction, for example, a deflection of five to fifteen degrees. This deflection reduces the transmittance of the light when passing through the second modulation component 60. Assuming the transmission axis direction of the second modulation component 60 is completely aligned with the ideal first polarization state direction, the larger the deflection angle, the lower the transmittance. In this way, the energy of the first color light in the first display region is further attenuated, achieving color compensation.

[0080] The second modulation component 60 can be a polarizer, with its transmission axis direction set to be consistent with the vibration direction of the first polarization state. For example, if the first polarization state is a horizontal linear polarization state, then the transmission axis direction of the second modulation component 60 is set to the horizontal direction. When light with a standard first polarization state is incident, its vibration direction is completely consistent with the transmission axis direction, and it can pass through completely. When there is an angle between the vibration direction of the light and the transmission axis direction, it cannot pass through completely. By adjusting the phase delay of each modulation region of the first modulation component 30, the polarization state deflection angle of different colored light after passing through the entire optical path in different display areas can be controlled, thereby controlling its transmittance at the second modulation component 60 and achieving fine color compensation.

[0081] It should be noted that the second modulation component 60 can be positioned at any suitable location after the second conversion component 50, as long as it can perform polarization filtering on the light output from the second conversion component 50. In some embodiments, the second modulation component 60 can be positioned immediately adjacent to the second conversion component 50 to reduce polarization drift in the intermediate optical path. In other embodiments, the second modulation component 60 can be positioned at the entrance of the projection optical system 100, serving as the first optical element in the projection optical path to perform polarization purification on the light entering the projection optical system 100.

[0082] In one example, such as Figure 3As shown, continuing the previous example, a second modulation component 60 is added after the second conversion component 50. The second modulation component 60 is a linear polarizer with its transmission axis set to the horizontal direction, consistent with the vibration direction of the first polarization state (S-polarization state). The configuration of the light source component 10, the first conversion component 40, the first modulation component 30, the display component, and the second conversion component 50 is the same as in the previous embodiment. During the red timing period, the red monochromatic light becomes red first polarized light with the vibration direction in the horizontal direction (first polarization state) after passing through the first conversion component 40. When this red first polarized light passes through the first modulation region A', since the phase delay of the red light in the first modulation region A' is set to one-eighth of the wavelength, the red light is transformed into elliptically polarized light, which is in the second polarization state. Elliptically polarized red light can be understood as polarized light with vertical and horizontal linear polarization components. When passing through the second modulation region B' and the third modulation region C', the red light basically maintains the horizontal linear polarization state.

[0083] After red light is incident on the first display area A of the LCOS display screen, the display screen rotates the polarization state of all incident light by 90 degrees. That is, the vertically polarized light in the elliptically polarized red light is converted to the horizontal direction, and the horizontally polarized light is converted to the vertical direction. The two are combined to obtain a third polarized light with a third polarization state perpendicular to the second polarization state. The linearly polarized red light received in the central and right-side areas corresponding to the second modulation area B' and the third modulation area C' also changes its vibration direction from horizontal to vertical, and is also in the third polarization state. After being reflected by the display screen, all red light enters the second conversion component 50.

[0084] The second conversion component 50 performs polarization state conversion on the incident third polarized light, converting the horizontal polarized light into a vertical polarized light, and converting the vertical polarized light into a horizontal polarized light (first polarization state), thus obtaining first polarized light with the first polarization state.

[0085] The red light output from the second conversion component 50 enters the second modulation component 60. The transmission axis of the second modulation component 60 is horizontal. The red light in the central and right-side regions has high transmittance. For the red light in the left-side region, since elliptically polarized light can be decomposed into two mutually perpendicular linearly polarized components, the component aligned with the transmission axis can pass through, while the component perpendicular to the transmission axis is blocked, resulting in lower transmittance.

[0086] Through the aforementioned optical path modulation and polarization filtering, the energy of the red component in the left region is reduced, the energy of the green component in the central region is reduced, and the energy of the blue component in the right region is reduced, while the energy of other color components in other regions remains essentially unchanged. During imaging, the reddish tint in the left region is compensated, the greenish tint in the central region is compensated, and the bluish tint in the right region is compensated, significantly improving the color uniformity of the entire image. Compared to a system without the second modulation component 60, this embodiment, by introducing the second modulation component 60 for polarization filtering, achieves a greater modulation depth for color compensation and a more significant compensation effect.

[0087] It is understandable that by adding a second modulation component 60 to the optical system 100, the polarization state of the light output by the second conversion component 50 can be filtered, effectively attenuating the energy of light whose polarization state has changed during the preceding modulation process, while allowing high transmission of light that maintains the standard polarization state.

[0088] In another embodiment, referring to Figure 1 The second conversion component 50 may further include: a phase delayer 51 for converting the polarization state of the third polarized light to obtain a fourth polarized light with a fourth polarization state; and a light reflector 52 for converting the polarization state of the fourth polarized light to obtain a fifth polarized light with a fifth polarization state.

[0089] For example, a phase delayer may include a quarter-wave plate.

[0090] The light reflector 52 can be a metal mirror or a dielectric mirror. When circularly polarized light is incident on the surface of the mirror and reflected, the rotation direction of the circularly polarized light will be reversed. For example, left-handed circularly polarized light becomes right-handed circularly polarized light after being reflected by the mirror, and right-handed circularly polarized light becomes left-handed circularly polarized light after being reflected by the mirror.

[0091] In one example, the third polarized light reflected by the display assembly 20 is S-polarized light, whose electric field vibration direction is perpendicular to the incident plane. This S-polarized light is incident on a phase retarder 51, which is a quarter-wave plate with its fast axis at a 45-degree angle to the polarization direction of the S-polarized light. After passing through the quarter-wave plate, the S-polarized light is converted into left-hand circularly polarized light, i.e., the fourth polarized light. The left-hand circularly polarized light continues to propagate and reaches a light reflector 52, which is a concave mirror used to simultaneously reflect and focus the light. After being reflected by the concave mirror, the left-hand circularly polarized light's rotation direction is reversed, becoming right-hand circularly polarized light, i.e., the fifth polarized light. The right-hand circularly polarized light returns along its original path and passes through the quarter-wave plate again. Because the rotation direction has been reversed, the right-hand circularly polarized light is converted into P-polarized light after passing through the quarter-wave plate. The electric field vibration direction of this P-polarized light is parallel to the incident plane and perpendicular to the original polarization direction of the S-polarized light. This P-polarized light is now the first polarized light with the first polarization state.

[0092] In another embodiment, referring to Figure 1 The first conversion component 40 may further include: a beam combiner 41 for combining monochromatic light of the same color from different chips; a second polarizer 42 for converting the combined light into sixth polarized light; and a polarization beam splitter 43 for separating the light in the sixth polarized light according to polarization state to obtain first polarized light.

[0093] For example, the beam combiner 41 can be an optical element used to converge multiple spatially dispersed light beams onto the same propagation path. In this optical system 100, the light source assembly 10 includes multiple light-emitting chips corresponding to the three primary colors, and these light-emitting chips have a certain spatial arrangement. When a light-emitting chip of a certain color is lit, light of the same color emitted by different chips is emitted from different spatial positions, forming multiple independent light beams. The function of the beam combiner 41 is to converge these monochromatic light beams of the same color from different chips into the same optical path, so that the subsequent optical system 100 can process these light beams uniformly. For example, the beam combiner 41 can be a compound eye lens array or a light tube.

[0094] The second polarizer 42 can be an optical element used to filter the polarization state of light. For example, the second polarizer 42 can be a linear polarizer.

[0095] The polarization beam splitter 43 can be an optical element used to separate optical paths according to the polarization state of light. For example, the polarization beam splitter 43 can be a polarization beam splitter prism with a polarization beam splitting film inside. The polarization beam splitter film has different optical response characteristics to P-polarized light and S-polarized light. In this example, the polarization beam splitter film reflects S-polarized light and transmits P-polarized light.

[0096] In one example, the light source component 10 uses an integrated packaged multi-chip LED, where the red channel contains three red LED chips arranged linearly. When the red timing arrives, the three red LED chips light up simultaneously, each emitting red light. The beam combiner 41 is a lens array consisting of three collimating lenses, each lens corresponding to one LED chip. After the three beams of red light pass through their respective collimating lenses, their propagation directions are adjusted to be approximately parallel, forming a mixed beam of red light in space. This mixed light is natural light, containing polarization components in various directions. The mixed light continues to propagate and reaches the second polarizer 42. The second polarizer 42 is a linear polarizer with its transmission axis in the vertical direction. After the natural light passes through this polarizer, only the polarization component with the electric field vibration direction in the vertical direction passes through, forming S-polarized light, which is the sixth polarized light. The sixth polarized light continues to propagate and is incident on the polarization beam splitter 43. The polarization beam splitter 43 is a cubic polarization beam splitter prism, whose internal polarization beam splitting film reflects the S-polarized light and transmits the P-polarized light. The sixth polarized light is incident in an S-polarized state, reflected by the polarizing beam splitter, and redirected towards the display assembly 20. The reflected light retains its S-polarized state, and this S-polarized light is the first polarized light. The first polarized light propagates along the reflected light path, passes through the modulation region, and illuminates the display area of ​​the display assembly 20.

[0097] Figure 4 The schematic diagram illustrates the optical path modulation principle of an optical system 100 according to an embodiment of the present disclosure.

[0098] In another embodiment, referring to Figure 1 The third polarized light is transmitted from the polarization beam splitter 43 and incident on the phase delayer 51; the fourth polarized light is reflected by the polarization beam splitter 43 and incident on the first polarizer.

[0099] In one example, refer to Figure 4The polarization beam splitter 43 is a cubic polarization beam splitter prism, whose internal polarization beam splitting film has a normal direction at a 45-degree angle to the horizontal plane. First polarized light, in an S-polarization state (first polarization state), is incident on the polarization beam splitter 43, reflected by the polarization beam splitting film, and propagates upwards. After being modulated by the modulation region of the first modulation component 30, it is converted into second polarized light in an elliptically polarized state (second polarization state). The second polarized light continues to propagate and reaches the display component 20. The display component 20 is an LCOS display screen, positioned above the polarization beam splitter 43. The display component 20 converts the second polarized light with the second polarization state into third polarized light with a third polarization state, which is perpendicular to the second polarization state. Here, the second and third polarized light are mixed polarized light, meaning the elliptically polarized state of the second polarized light can include linear polarization components in both the horizontal and vertical directions. Similarly, the third polarized light can include linearly polarized components in both horizontal and vertical directions. However, the horizontally polarized light in the third polarized light corresponds to the vertically polarized light in the second polarized light, and vice versa. The third polarized light returns downward to the polarizing beam splitter 43 and is incident on the polarizing beam splitter film. The P-polarized light passes through the polarizing beam splitter 43 and reaches the phase retarder 51. The S-polarized light, incident on the polarizing beam splitter 43, is reflected by the polarizing beam splitter film and does not enter the subsequent optical path. The phase retarder 51 is a quarter-wave plate. The third polarized light (the P-polarized light) is converted into left-hand circularly polarized light, i.e., the fourth polarized light, after passing through the quarter-wave plate. The fourth polarized light continues to propagate and reaches the light reflector 52. The light reflector 52 is a concave mirror. The left-hand circularly polarized light is converted into right-hand circularly polarized light, i.e., the fifth polarized light, after being reflected by the mirror. The fifth polarized light is converted into the first polarized light in the S polarization state (first polarization state) by the quarter-wave plate (phase delayer 51). The first polarized light is incident on the polarization beam splitter 43, reflected by the polarization beam splitter film, and incident on the second modulation component 60 (polarizer), and reflected by the second modulation component 60 (polarizer).

[0100] This disclosure also provides a processing method. The following will be combined with... Figure 5 The method is described in detail.

[0101] The processing method of this embodiment is applied to an optical system, which includes a light source assembly 10 and a display assembly 20.

[0102] The light source assembly 10 includes at least one light-emitting chip corresponding to each of the three primary colors, and at the same time, the light-emitting chip of the same color generates monochromatic light; the display assembly 20 includes multiple display areas.

[0103] It should be noted that this optical system differs from the optical system 100 described above in that it does not include the first modulation component. The descriptions of the light source component and the display component can be found in the description of the optical system 100 described above, and will not be repeated here.

[0104] Figure 5 A flowchart illustrating a processing method according to an embodiment of the present disclosure is shown schematically.

[0105] like Figure 5 As shown, the processing method of this embodiment includes operations S210 to S220.

[0106] In operation S210, the color information of the light source component 10 in multiple display areas of the display component 20 is determined. The light source component includes at least one light-emitting chip corresponding to each of the three primary colors. At the same time, the light-emitting chip of the same color generates monochromatic light.

[0107] In operation S220, based on color information, multiple modulation regions in the first modulation component 30 are determined. These multiple modulation regions correspond one-to-one with multiple display regions. Different modulation regions can modulate monochromatic light of different colors to perform color compensation on the corresponding display regions.

[0108] For example, by analyzing the actual color performance of the light source component in each display area of ​​the display component, the color deviation characteristics of each area are identified. Then, the modulation area corresponding to each display area is divided in the first modulation component, and different light modulation parameters are set for each modulation area, thereby achieving targeted color compensation for different display areas.

[0109] In one example, an optical system without a first modulation component is placed in a test environment. The light source component sequentially illuminates red, green, and blue LED chips. Each time a color is illuminated, a colorimeter is used to measure illuminance and color coordinates at different locations on the display component. Specifically, multiple test points are selected on the display component, each representing a different display area. Illuminance and color coordinate values ​​(color information) are measured under red, green, and blue illumination. The measurement results show that the first display area A is reddish, the second display area B is bluish, and the third display area C is greenish. Based on the color information of different display areas, modulation areas need to be defined in the first modulation component, with one modulation area corresponding to one display area. Since the first display area A is reddish, the second display area B is bluish, and the third display area C is greenish, the first modulation area A' is used to have a small phase delay for green and blue light, but a certain phase delay for red light. Thus, long-wavelength linearly polarized light becomes elliptically polarized light when passing through this area. Conversely, for the second display area B which is bluish, the corresponding area B' of area B has a relatively small phase delay for red and green light, and short-wavelength linearly polarized light will become elliptically polarized light when passing through this area.

[0110] Based on the aforementioned optical system, this disclosure also provides a display device. The following will be combined with... Figure 6 The display device is described in detail.

[0111] Figure 6 A schematic diagram of the structure of a display device according to an embodiment of the present disclosure is shown.

[0112] like Figure 6 As shown, the display device 1 in this embodiment includes an optical system 100 and an imaging device 200.

[0113] The optical system 100 includes: a light source assembly 10, including at least one light-emitting chip corresponding to each of the three primary colors, wherein light-emitting chips of the same color generate monochromatic light at the same time; a display assembly 20, including multiple display areas; and a first modulation assembly 30, having multiple modulation areas corresponding to the multiple display areas, wherein different modulation areas can modulate monochromatic light of different colors to perform color compensation on the corresponding display areas.

[0114] Imaging device 200 is used to image monochromatic light emitted in a time sequence.

[0115] It should be noted that the description of the optical system 100 can be found in the above description of the optical system 100, and will not be repeated here.

[0116] For example, the imaging device 200 may be the image presentation portion of a display device. This device receives light emitted from an optical system and converts this light into an image that can be viewed by the user.

[0117] When the display device is a projection system, the imaging device can be an exit pupil expander. When the display device is augmented reality glasses or a virtual reality headset, the imaging device can be an eyepiece optical system. When the display device is an automotive head-up display (HUD), the imaging device can be a freeform surface combination lens. When the display device is a portable micro-projector, the imaging device can be a projection lens group.

[0118] In some embodiments, for the same light source component 10, different types of imaging devices 200 may be used, resulting in different final imaging effects. For example, if the imaging device 200 uses an exit pupil expander, the first display area may be reddish, and the second display area may be bluish. If the imaging device 200 uses an automotive head-up display system, the first display area may be bluish, and the second display area may be reddish. Therefore, based on the color information of different display areas tested during the testing phase of different imaging devices 200, the modulation parameters of different modulation areas of the first modulation component 30 corresponding to the display component 20 can be dynamically adjusted to make the color performance of the imaging effect of different display devices 1 more uniform.

[0119] Those skilled in the art will understand that the features described in the various embodiments and / or claims of this disclosure can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in this disclosure. In particular, the features described in the various embodiments and / or claims of this disclosure can be combined or combined in various ways without departing from the spirit and teachings of this disclosure. All such combinations and / or combinations fall within the scope of this disclosure.

[0120] The embodiments of this disclosure have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of this disclosure. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of this disclosure is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of this disclosure, and all such substitutions and modifications should fall within the scope of this disclosure.

Claims

1. An optical system, comprising: A light source assembly includes at least one light-emitting chip corresponding to each of the three primary colors, wherein the light-emitting chip of the same color generates monochromatic light at the same time; A display assembly, comprising multiple display areas; The first modulation component has multiple modulation regions corresponding to the multiple display areas. Different modulation regions can modulate monochromatic light of different colors to perform color compensation on the corresponding display areas.

2. The optical system according to claim 1, wherein the plurality of modulation regions includes one or more of a first modulation region, a second modulation region, and a third modulation region, wherein: The first modulation region is used to increase the phase delay of the first color light in the three primary colors, so as to reduce the energy of the first color light received by the first display region; The first modulation region is used to increase the phase delay of the second color light in the three primary colors, so as to reduce the energy of the second color light received by the second display region; The first modulation region is used to increase the phase delay of the third color light in the three primary colors, so as to reduce the energy of the third color light received by the third display region.

3. The optical system according to claim 2, further comprising: A first conversion component is used to convert monochromatic light into first polarized light having a first polarization state; The first polarized light is of the first color, the second color, or the third color; The first modulation region converts first polarized light of the first color into second polarized light of the first color with a second polarization state; The second modulation region converts the first polarized light of the second color into second polarized light of the second color with a second polarization state; The third modulation region converts the first polarized light of the third color into second polarized light of the third color with a second polarization state; The display component is used to convert the polarization state of the second polarized light to obtain the third polarized light with a third polarization state; the vibration direction of the third polarization state is perpendicular to that of the second polarization state. The second conversion component is used to convert the polarization state of the third polarized light to obtain the first polarized light with the first polarization state.

4. The optical system according to claim 3, further comprising: The second modulation component is used to filter the first polarized light that does not have the first polarization state.

5. The optical system according to claim 3, wherein the second conversion component comprises: A phase delayer is used to convert the polarization state of the third polarized light to obtain a fourth polarized light with a fourth polarization state. A light reflector is used to convert the polarization state of the fourth polarized light to obtain a fifth polarized light with a fifth polarization state.

6. The optical system according to claim 3, wherein the first conversion component comprises: A beam combiner is used to combine monochromatic rays of the same color from different chips. The second polarizer is used to convert the combined light beam into sixth polarized light. A polarization beam splitter is used to separate the light rays in the sixth polarized light according to their polarization states to obtain the first polarized light.

7. The optical system of claim 6, wherein the third polarized light is transmitted from the polarization beam splitter to the phase retarder; The fourth polarized light is reflected by the polarization beam splitter and incident on the first polarizer.

8. The optical system of claim 5, wherein the phase retarder comprises a quarter-wave plate.

9. A processing method applied to an optical system. The system includes: A light source assembly includes at least one light-emitting chip corresponding to each of the three primary colors, wherein the light-emitting chip of the same color generates monochromatic light at the same time; A display assembly, comprising multiple display areas; The method includes: The color information of the light source component in multiple display areas is determined. The light source component includes at least one light-emitting chip corresponding to each of the three primary colors. At the same time, the light-emitting chip of the same color produces monochromatic light. Based on the color information, multiple modulation regions in the first modulation component are determined. Each of the multiple modulation regions corresponds to a multiple display region. Different modulation regions can modulate monochromatic light of different colors to perform color compensation on the corresponding display regions.

10. A display device, comprising: An optical system comprising: a light source assembly including at least one light-emitting chip corresponding to each of the three primary colors, wherein the light-emitting chips of the same color at the same time generate monochromatic light; a display assembly including multiple display areas; and a first modulation assembly having multiple modulation areas corresponding to the multiple display areas, wherein different modulation areas can modulate monochromatic light of different colors to perform color compensation on the corresponding display areas. An imaging device for imaging monochromatic light rays emitted in a time sequence.

Images