Light source assembly and image projection device comprising same

Abstract

Disclosed are a light source assembly and an image projection device comprising same, the light source assembly comprising: a first light source array including a plurality of first light sources for outputting light of a first color; a second light source array including a plurality of second light sources for outputting light of a second color and a plurality of third light sources for outputting light of a third color; a first dichroic mirror arranged to correspond to the first light source array; a second dichroic mirror arranged to correspond to the second light source array; and a plurality of reflective mirrors reflecting light that is transmitted through the second dichroic mirror, wherein the first dichroic mirror allows the light of the second color and the light of the third color to be transmitted therethrough when reflecting the light of the first color, and reflects the light of the second color and the light of the third color when allowing the light of the first color to be transmitted therethrough, and the second dichroic mirror can reflect the light of the second color and allow the light of the third color to be transmitted therethrough.

Description

Light source assembly and image projection device including the same

[0001] The present disclosure relates to a light source assembly and an image projection device including the same, and more particularly, to a light source assembly including a plurality of laser diodes that output light of different colors, and an image projection device including the same.

[0002] With the recent increase in consumption of high-quality, high-capacity multimedia content, there is a growing demand for larger and higher-quality screens. Among display devices, video projectors use optical devices to project images externally, offering the advantage of easily implementing large screens compared to other display devices.

[0003] These image projection devices synthesize images based on light emitted from a light source and image signals, then adjust the ratio and project the images externally. Recently, there has been a movement to utilize light-emitting diodes, laser diodes, or organic light-emitting diodes as light sources in image projection devices. In particular, laser diodes provide light of a single wavelength, offering superior efficiency and improved brightness. Therefore, active research is being conducted on image projection devices utilizing laser diodes as light sources.

[0004] Meanwhile, recent efforts have been made to improve the performance of display devices, while also miniaturizing and integrating them. In the prior art (Korean Patent Publication No. 10-2016-0061373), red, green, or blue light sources are used on three panels to achieve high brightness. However, this results in a complex optical device configuration and a larger size.

[0005] The present disclosure aims to solve the above-mentioned and other problems.

[0006] Another purpose is to provide a light source assembly capable of simply implementing the configuration of an optical device and securing high brightness performance, and an image projection device including the same.

[0007] Another purpose is to provide a light source assembly capable of securing brightness and uniformity performance of light output from the light source assembly and an image projection device including the same.

[0008] Another purpose is to provide a light source assembly capable of minimizing the size of an optical device and an image projection device including the same.

[0009] In order to achieve the above object, an image projection device according to one embodiment of the present disclosure comprises a light source assembly comprising: a first light source array including a plurality of first light sources that output light of a first color; a second light source array including a plurality of second light sources that output light of a second color and a plurality of third light sources that output light of a third color; a first dichroic mirror arranged corresponding to the first light source array; a second dichroic mirror arranged corresponding to the second light source array; And it includes a plurality of reflecting mirrors (551, 553) that reflect light passing through the second dichroic mirror, and when the first dichroic mirror reflects light of the first color, it transmits light of the second color and light of the third color, and when the first color light is transmitted, it reflects light of the second color and light of the third color, and when the second dichroic mirror reflects light of the second color and transmits light of the third color.

[0010] In order to achieve the above object, an image projection device according to one embodiment of the present disclosure includes a light source assembly including a plurality of light sources, wherein the light source assembly includes a first light source array including a plurality of first light sources that output light of a first color; a second light source array including a plurality of second light sources that output light of a second color and a plurality of third light sources that output light of a third color; a first dichroic mirror arranged corresponding to the first light source array; a second dichroic mirror arranged corresponding to the second light source array; And it includes a plurality of reflecting mirrors (551, 553) that reflect light passing through the second dichroic mirror, and when the first dichroic mirror reflects light of the first color, it transmits light of the second color and light of the third color, and when the first color light is transmitted, it reflects light of the second color and light of the third color, and when the second dichroic mirror reflects light of the second color and transmits light of the third color.

[0011] The effects of the light source assembly according to the present disclosure and the image projection device including the same are described as follows.

[0012] According to at least one embodiment of the present disclosure, the configuration of an optical device can be simply implemented and high brightness performance can be secured.

[0013] According to at least one embodiment of the present disclosure, brightness and uniformity performance of light output from a light source assembly can be secured.

[0014] According to at least one embodiment of the present disclosure, the size of an optical device can be minimized.

[0015] Further scope of the applicability of the present disclosure will become apparent from the detailed description below. However, since various modifications and variations within the spirit and scope of the present disclosure will become apparent to those skilled in the art, it should be understood that the detailed description and specific examples, such as preferred embodiments of the present disclosure, are given by way of example only.

[0016] FIG. 1 is a diagram illustrating an imaging system according to one embodiment of the present disclosure.

[0017] Figure 2 is an internal block diagram of the image projection device of Figure 1.

[0018] Figure 3 is an internal block diagram of the signal processing device of Figure 2.

[0019] FIG. 4 is an example of the structure of an optical device of an image projection device according to one embodiment of the present disclosure.

[0020] FIGS. 5 and 6 are drawings for reference in explaining the configuration of a light source assembly according to one embodiment of the present disclosure.

[0021] FIG. 7 is a drawing for reference in explaining the configuration of a light source assembly according to another embodiment of the present disclosure.

[0022] FIGS. 8 and 9 are drawings for reference in explaining the uniformity of light output from a light source assembly according to embodiments of the present disclosure.

[0023] Hereinafter, the present disclosure will be described in detail with reference to the drawings. In the drawings, portions irrelevant to the description are omitted to clearly and concisely describe the present disclosure, and the same reference numerals are used for identical or extremely similar portions throughout the specification.

[0024] The suffixes "module" and "part" used in the following description are given solely for the convenience of writing this specification and do not impart any particularly significant meaning or role to the components themselves. Therefore, the terms "module" and "part" may be used interchangeably.

[0025] In this application, terms such as “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but should be understood not to preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0026] Additionally, while terms such as "first" and "second" may be used in this specification to describe various elements, these elements are not limited by these terms. These terms are used only to distinguish one element from another.

[0027] Hereinafter, an optical device may refer to a device that outputs visible light. Such an optical device may be applied to an image projection device. Alternatively, it may also be applied to a lighting device.

[0028] Hereinafter, the image projection device may be referred to as a projector. Meanwhile, the image projection device described in this disclosure may also be installed as a component within another device. For example, it may be installed within a mobile terminal, or it may be incorporated into home appliances such as air conditioners, refrigerators, cooking appliances, and robot vacuum cleaners, or it may be installed within vehicles such as automobiles.

[0029] Hereinafter, directions are defined based on the rectangular coordinate system. In the rectangular coordinate system, the x-axis direction can be defined as the left-right direction. At this time, the direction toward +x with respect to the origin can mean the right direction, and the direction toward -x can mean the left direction. In addition, the y-axis direction can be defined as the front-back direction. At this time, the direction toward +y with respect to the origin can mean the front direction, and the direction toward -y can mean the rear direction. In addition, the z-axis direction can be defined as the up-down direction. At this time, the direction toward +z with respect to the origin can mean the upward direction, and the direction toward -z can mean the downward direction.

[0030] FIG. 1 is a diagram illustrating an imaging system according to one embodiment of the present disclosure.

[0031] Referring to FIG. 1, the image system (10) may include an image projection device (100). The image projection device (100) may project an image onto a real background (20). Hereinafter, an image projected from the image projection device (100) may be referred to as a projection image. In FIG. 1, the real background (20) is exemplified as a screen having a flat surface, but is not limited thereto. A user may view a projection image projected onto the real background (20).

[0032] The video system (10) may include a remote control device (not shown). The remote control device may be connected to the video projection device (100) in a communication manner and provide various control signals to the video projection device (100). At this time, the remote control device may include a device that establishes a communication network with the video projection device (100) and transmits various control signals to the video projection device (100) through the established communication network, or receives signals related to various operations processed in the video projection device (100) from the video projection device (100). In the present disclosure, the remote control device is described as an example of a space remote control, but is not limited thereto.

[0033] The image projection device (100) can be connected to only a single remote control device or to two or more remote control devices simultaneously, and can change the projected image or adjust the state of the projected image based on the control signal provided from each remote control device.

[0034] Figure 2 is an internal block diagram of the image projection device of Figure 1.

[0035] Referring to FIG. 2, the image projection device (100) may include a memory (120), a communication interface (140), a signal processing device (170), an image output device (180), and / or a power supply unit (190).

[0036] The memory (120) may store programs for each signal processing and control within the signal processing device (170), or may store signal-processed image or data signals. For example, the memory (120) may store application programs designed for the purpose of performing various tasks that can be processed by the signal processing device (170), and may selectively provide some of the stored application programs upon request from the signal processing device (170).

[0037] Programs stored in the memory (120) are not particularly limited as long as they can be executed by the signal processing device (170).

[0038] Although the memory (120) of FIG. 2 is provided separately from the signal processing device (170), the scope of the present invention is not limited thereto, and the memory (120) may be included within the signal processing device (170).

[0039] The memory (120) may include at least one of volatile memory (e.g., DRAM, SRAM, SDRAM, etc.) or non-volatile memory (e.g., flash memory, hard disk drive (HDD), solid-state drive (SSD), etc.).

[0040] The communication interface (140) can serve as an interface with any external device or network connected to the image projection device (100) via wire or wirelessly. The communication interface (140) can receive data or power from such external devices and transmit it to each component within the image projection device (100), and can enable data within the image projection device (100) to be transmitted to the external device.

[0041] The communication interface (140) can receive a wireless signal from a mobile terminal (not shown). Here, the wireless signal can include various types of data, such as a voice call signal, a video call signal, text data, or image data. Meanwhile, the communication interface (140) can receive a control signal from a remote control device (200).

[0042] The communication interface (140) may be equipped with a short-range communication device (not shown). Short-range communication technologies such as Bluetooth, RFID (Radio Frequency Identification), infrared communication (IrDA, infrared Data Association), UWB (Ultra-Wideband), ZigBee, and NFC (Near Field Communication) may be used.

[0043] The signal processing device (170) may include at least one processor. Here, the processor may be a general processor such as a central processing unit (CPU). Of course, the processor may be a dedicated device such as an ASIC or another hardware-based processor.

[0044] The signal processing device (170) can control the overall operation of the image projection device (100). The signal processing device (170) can control the operation of each unit within the image projection device (100). The signal processing device (170) can be referred to as a control unit (170).

[0045] The signal processing device (170) can control a video image stored in the memory (120) or a video image received from the outside through the communication interface (140) to be output to the outside as a projection image.

[0046] The signal processing device (170) can control the image output device (180). The image output device (180) can be equipped with a driving device (185) and / or an optical device (210). The signal processing device (170) can control the optical device (210) or the driving device (185) that outputs visible light such as R, G, and B. For example, the signal processing device (170) can output R, G, and B signals corresponding to a video image to the optical device (210) or the driving device (185).

[0047] The driving device (185) can drive the optical device (210). For example, the driving device (185) can drive a light source within the optical device (210).

[0048] The optical device (210) may include optical components such as a light source and a lens for light output, particularly visible light output. In particular, the optical device (210) according to the embodiment of the present disclosure can easily implement color separation and synthesis of light. This will be described later with reference to FIG. 4 and below.

[0049] The power supply unit (190) can supply power required for the operation of each component by receiving external power or internal power under the control of the signal processing device (170).

[0050] The power supply unit (190) supplies power to the entire image projection device (100). In particular, it can supply power to a signal processing device (170) that can be implemented in the form of a system on chip (SOC), an image output device (180) for image display, and an audio output unit (not shown) for audio output.

[0051] Meanwhile, although not illustrated in FIG. 2, the image projection device (100) may include an input unit. The input unit may be provided on one side of the main body of the image projection device (100). For example, the input unit may include a touch pad, a physical button, etc.

[0052] The input unit can receive various user commands related to the operation of the image projection device (100) and transmit a control signal corresponding to the input command to the signal processing device (170).

[0053] Meanwhile, the block diagram of the image projection device (100) illustrated in FIG. 2 is only a block diagram for one embodiment of the present disclosure, and each component of the block diagram may be integrated, added, or omitted depending on the specifications of the image projection device (100) actually implemented.

[0054] That is, two or more components may be combined into a single component, or a single component may be subdivided into two or more components, as needed. Furthermore, the functions performed by each block are intended to illustrate embodiments of the present invention, and their specific operations or devices do not limit the scope of the present invention.

[0055] Figure 3 is an internal block diagram of the control unit of Figure 2.

[0056] Referring to FIG. 3, a signal processing device (170) according to one embodiment of the present invention may include a demultiplexing unit (310), an image processing unit (320), a processor (330), an OSD generation unit (340), a mixer (345), a frame rate conversion unit (350), and / or a formatter (360). In addition, an audio processing unit (not shown) and a data processing unit (not shown) may be further included.

[0057] The demultiplexer (310) can demultiplex an input stream.

[0058] The image processing unit (320) can perform image processing of a demultiplexed image signal. To this end, the image processing unit (320) may be equipped with an image decoder (325) and a scaler (335).

[0059] The video decoder (325) can decode a demultiplexed video signal, and the scaler (335) can perform scaling so that the resolution of the decoded video signal can be output on the display (180).

[0060] The video decoder (325) can be equipped with decoders of various specifications.

[0061] The processor (330) can control the overall operation within the image projection device (100) or the signal processing device (170). In addition, the processor (330) can control the operation of the demultiplexing unit (310), the image processing unit (320), the OSD generation unit (340), etc. within the signal processing device (170).

[0062] The OSD generation unit (340) can generate an OSD signal based on user input or on its own. The OSD generation unit (340) can generate a pointer based on a pointing signal input from a remote control device (200). The OSD generation unit (340) can include a pointing signal processing unit (not shown) that generates the pointer. The pointing signal processing unit (not shown) can also be provided separately rather than being included within the OSD generation unit (240).

[0063] The mixer (345) can mix the OSD signal generated by the OSD generation unit (340) and the decoded image signal processed by the image processing unit (320). The mixed image signal can be provided to the frame rate conversion unit (350).

[0064] The frame rate converter (FRC) (350) can convert the frame rate of an input video. Meanwhile, the frame rate converter (350) can also output the video as is without a separate frame rate conversion.

[0065] Meanwhile, the formatter (360) can receive a mixed signal from the mixer (345), i.e., an OSD signal and a decoded image signal, and perform signal conversion for input to the image output device (180). For example, it can output a low voltage differential signal (LVDS).

[0066] Meanwhile, the block diagram of the signal processing device (170) illustrated in FIG. 3 is a block diagram for one embodiment of the present disclosure. Each component of the block diagram may be integrated, added, or omitted depending on the specifications of the signal processing device (170) actually implemented.

[0067] In particular, the frame rate converter (350) and the formatter (360) are not provided within the signal processing device (170), but may be provided separately, or may be provided separately as one module.

[0068] FIG. 4 is an example of the structure of an optical device of an image projection device according to one embodiment of the present disclosure.

[0069] Referring to FIG. 4, the optical device (210) may include a light source assembly (410) that outputs light, a condenser lens (420), a diffuser (430) that diffuses light passing through the condenser lens (420), a reflective mirror (440), a display element (450), a total internal reflection (TIR) ​​prism (460), an actuator (470), and / or an optical lens (480).

[0070] The light source assembly (410) may include at least one light source. For example, the light source assembly (410) may include a plurality of laser diodes that output red light, blue light, and green light, respectively. The light source assembly (410) may include at least one dichroic filter that reflects a portion of incident light and transmits the other portion. The dichroic filter may be referred to as a dichroic mirror. In this case, as the light output from the light source included in the light source assembly (410) is transmitted or reflected through the dichroic filter, color separation and synthesis of the light may be achieved.

[0071] The condenser lens (420) can change the path of light output from the light source assembly (410). The path of light of multiple colors output from the light source assembly (410) and passing through the condenser lens (420) can be directed toward the focus of the condenser lens (420).

[0072] The reflective mirror (440) can reflect light passing through the diffuser (430) in a direction toward the display element (450).

[0073] The display element (450) can output a projection image based on light reflected by the reflective mirror (440). According to one embodiment, the display element (450) can include a digital micro-mirror device (DMD). The digital micro-mirror device can be configured by arranging a plurality of microscopic mirrors. In this case, each of the plurality of mirrors can function as a pixel to selectively reflect the light reflected by the reflective mirror (440) to implement a projection image. Since light loss is minimized by the operation of the micro-mirror, light efficiency is improved and color reproducibility is excellent, so that a 4K projection image or an 8K projection image can be output. Meanwhile, in the present disclosure, the display element (450) is described as an example of a digital micro-mirror device, but is not limited thereto. For example, the display element (450) can include a transparent display panel such as a liquid crystal display panel.

[0074] The optical lens (480) may include a projection lens. The optical lens can adjust the size of the projected image.

[0075] Meanwhile, although not shown in the drawing, the optical device (210) may further include a collimator lens, a fly-eye lens, an illumination lens, etc. Accordingly, the configuration of the optical device (210) can be implemented simply and high brightness performance can be secured.

[0076] FIGS. 5 and 6 are drawings for reference in explaining the configuration of a light source assembly according to one embodiment of the present disclosure.

[0077] Referring to FIGS. 5 and 6, the light source assembly (410) may include a substrate (510), a first light source array (520), a second light source array (530), a first dichroic mirror (541), a second dichroic mirror (542), a first reflective mirror (551), and / or a second reflective mirror (553).

[0078] A first light source array (520) and a second light source array (530) may be arranged on a substrate (510). The first light source array (520) and the second light source array (530) may be mounted on one surface of the substrate (510). The first light source array (520) and the second light source array (530) may be arranged to be spaced apart from each other along the x-axis direction. The first light source array (520) and the second light source array (530) may be arranged in parallel along the x-axis direction.

[0079] The first light source array (520) may include a plurality of first light sources (521). The plurality of first light sources (521) may be arranged along the y-axis direction. The plurality of first light sources (521) may emit light of a first color toward the upper direction.

[0080] The second light source array (530) may include a plurality of second light sources (531) and a plurality of third light sources (533). A plurality of second light sources (531) may be arranged on one side of the second light source array (530), and a plurality of third light sources (533) may be arranged on the other side of the second light source array (530). The plurality of second light sources (531) and the plurality of third light sources (533) may be arranged along the y-axis direction. The plurality of second light sources (531) may emit light of a second color toward an upward direction. The plurality of third light sources (533) may emit light of a third color toward an upward direction.

[0081] That is, when the first light source array (520) and the second light source array (530) are arranged on one substrate (510), the size of the optical device (210) can be reduced compared to the case where the first light source (521), the second light source (531), and the third light source (533) are arranged on separate substrates. In addition, since the second light source (531) and the third light source (533) are arranged together on the second light source array (530), the size of the optical device (210) can be further reduced compared to the case where the first light source (521), the second light source (531), and the third light source (533) are arranged on one substrate (510) to form a light source array.

[0082] The first dichroic mirror (541) may be arranged above the first light source array (520). The first dichroic mirror (541) may reflect light of a first color. Light of a first color (RL1) emitted upward from the first light source (521) may be reflected by the first dichroic mirror (541) and may face in the right direction. Light of a first color (RL2) reflected by the first dichroic mirror (541) may be incident on the condenser lens (420) along the right direction.

[0083] The first dichroic mirror (541) can transmit light of a second color and light of a third color. The direction of propagation of light transmitting through the first dichroic mirror (541) can be maintained.

[0084] The second dichroic mirror (542) may be arranged above the second light source array (530). The second dichroic mirror (542) may reflect light of a second color. Light of a second color (GL1) emitted upward from the second light source (531) may be reflected by the second dichroic mirror (542) and directed to the right. Light of a second color (RL2) reflected by the second dichroic mirror (542) and directed to the right may be incident on the first dichroic mirror (541). Light of a second color (GL3) transmitted through the first dichroic mirror (541) may be incident on the condenser lens (420) along the right direction.

[0085] The first dichroic mirror (541) and the second dichroic mirror (542) can be arranged parallel to each other.

[0086] The second dichroic mirror (542) can transmit light of a third color. The direction of propagation of light transmitting through the second dichroic mirror (542) can be maintained.

[0087] The third color light (BL1) emitted upward from the third light source (533) may be incident on the second dichroic mirror (542). The third color light (BL2) transmitted through the second dichroic mirror (542) may be directed upward. The third color light (BL2) transmitted through the second dichroic mirror (542) may be reflected by the first reflective mirror (551). The third color light (BL3) reflected by the first reflective mirror (551) may be directed toward the second reflective mirror (553). The third color light (BL3) incident on the second reflective mirror (553) may be reflected by the second reflective mirror (553). The third color light (BL4) reflected by the second reflective mirror (553) may be directed in a predetermined direction corresponding at least to the right direction. The predetermined direction may be a direction toward the second color light (GL3) transmitted through the first dichroic mirror (541). The third color light (BL4) reflected from the second reflective mirror (553) may be incident on the second dichroic mirror (542). The third color light (BL5) transmitted through the second dichroic mirror (542) may be incident on the first dichroic mirror (541) along a predetermined direction. The third color light (BL6) transmitted through the first dichroic mirror (541) may be incident on the condenser lens (420) along a predetermined direction. That is, the direction toward which the second color light (GL3) transmitted through the first dichroic mirror (541) is directed and the direction toward which the third color light (BL6) is directed may intersect with each other.

[0088] According to one embodiment, the number of first light sources (521) may be greater than the number of second light sources (531). The number of second light sources (531) may be greater than the number of third light sources (533).

[0089] FIG. 7 is a drawing for reference in explaining the configuration of a light source assembly according to another embodiment of the present disclosure. Any details that overlap with those described in FIGS. 5 and 6 will be omitted for detailed explanation.

[0090] Referring to Fig. 7, the first dichroic mirror (541') can transmit light of the first color. In Fig. 7, the first dichroic mirror (541') is referred to as the third dichroic mirror (543) to distinguish it from the first dichroic mirror (541) of Fig. 5.

[0091] The propagation direction of light passing through the third dichroic mirror (543) can be maintained. Light of the first color (RL1') emitted upward from the first light source (521) can be incident on the third dichroic mirror (543). Light of the first color (RL2') passing through the third dichroic mirror (543) can be incident on the condenser lens (420) along the upward direction.

[0092] The third dichroic mirror (543) can reflect light of a second color and light of a third color. The second dichroic mirror (542) and the third dichroic mirror (543) can be arranged parallel to each other.

[0093] The second color light (GL1') emitted from the second light source (531) toward the upper direction may be reflected from the second dichroic mirror (542) and directed toward the right. The second color light (RL2') reflected from the second dichroic mirror (542) and directed toward the right may be reflected from the third dichroic mirror (543) and directed toward the upper direction. The second color light (GL3') reflected from the third dichroic mirror (543) may be incident on the condenser lens (420) along the upper direction.

[0094] The third color light (BL1') emitted upward from the third light source (533) may be incident on the second dichroic mirror (542). The third color light (BL2') transmitted through the second dichroic mirror (542) may be directed upward. The third color light (BL2') transmitted through the second dichroic mirror (542) may be reflected by the first reflective mirror (551). The third color light (BL3') reflected by the first reflective mirror (551) may be directed toward the second reflective mirror (553). The third color light (BL3') incident on the second reflective mirror (553) may be reflected by the second reflective mirror (553). The third color light (BL4') reflected by the second reflective mirror (553) may be directed toward at least a first direction corresponding to the right direction. The third color light (BL4') reflected from the second reflective mirror (553) may be incident on the second dichroic mirror (542). The third color light (BL5') transmitted through the second dichroic mirror (542) may be incident on the third dichroic mirror (543) along the first direction. The third color light (BL5') incident on the third dichroic mirror (543) along the first direction may be reflected by the third dichroic mirror (543) and may be directed in a second direction corresponding at least to the upper direction. The second direction may be a direction directed toward the second color light (GL3') reflected from the third dichroic mirror (543). The third color light (BL6') reflected from the third dichroic mirror (543) may be incident on the condenser lens (420) along the second direction. That is, the direction in which the second color light (GL3') reflected from the third dichroic mirror (543) is directed and the direction in which the third color light (BL6') is directed can intersect each other.

[0095] FIGS. 8 and 9 are drawings for reference in explaining the uniformity of light output from a light source assembly according to embodiments of the present disclosure.

[0096] Referring to FIG. 8, a first region (810) corresponding to a first light incident on a condenser lens (420) may overlap at least a portion of a second region (810) corresponding to a second light incident on the condenser lens (420). In addition, the region where the first region (810) and the second region (820) overlap may overlap at least a portion of a third region (830) corresponding to a third light incident on the condenser lens (420). Here, a region (800) where the first region (810), the second region (820), and the third region (830) all overlap may be referred to as a white region (800).

[0097] When the second dichroic mirror (542) reflects both the second color light and the third color light, the second region (820) and the third region (830) may be distributed in correspondence to the arrangement of the second light source (531) and the third light source (533) in the second light source array (530). At this time, as shown by reference numeral 801, the size of the white region (800) may be relatively small.

[0098] Meanwhile, according to various embodiments of the present disclosure, when the second dichroic mirror (542) transmits light of a third color and the first reflective mirror (551) and the second reflective mirror (553) reflect light of a third color, the direction of propagation of the light of the third color can be guided toward the direction of propagation of the light of the second color, regardless of the arrangement of the second light source (531) and the third light source (533) in the second light source array (530). Accordingly, the size of the white area (800) can be relatively large, as shown by reference numeral 802.

[0099] Referring to FIG. 9, when the size of the white area (800) is relatively small (901), the white uniformity may be relatively small, such as a first value (e.g., 90.1%). On the other hand, when the size of the white area (800) is relatively large (902), the white uniformity may be relatively large, such as a second value (e.g., 95.7%). Here, the white uniformity may refer to the degree to which white is uniformly displayed across the entire screen.

[0100] In addition, when the size of the white area (800) is relatively small (901), the color uniformity may be relatively large, such as a third value (e.g., 0.020). On the other hand, when the size of the white area (800) is relatively large (902), the color uniformity may be relatively small, such as a fourth value (e.g., 0.012). Here, the color uniformity may mean the difference between the color chromaticity at a given point on the screen and the color chromaticity at the center of the screen.

[0101] Therefore, when the size of the white area (800) increases according to the configuration of the light source assembly (410) according to various embodiments of the present disclosure, the uniformity of light can be improved.

[0102] As described above, according to at least one embodiment of the present disclosure, the configuration of the optical device (210) can be simply implemented and high brightness performance can be secured.

[0103] Additionally, according to at least one embodiment of the present disclosure, brightness and uniformity performance of light output from the light source assembly (410) can be secured.

[0104] According to at least one embodiment of the present disclosure, the size of the optical device (210) can be minimized.

[0105] Referring to FIGS. 1 to 9, a light source assembly (410) according to one aspect of the present disclosure includes: a first light source array (520) including a plurality of first light sources (521) that output light of a first color; a second light source array (530) including a plurality of second light sources (531) that output light of a second color and a plurality of third light sources (533) that output light of a third color; a first dichroic mirror (541, 541') arranged corresponding to the first light source array (520); a second dichroic mirror (542) arranged corresponding to the second light source array (530); And it includes a plurality of reflecting mirrors (551, 553) that reflect light passing through the second dichroic mirror (542), and the first dichroic mirror (541, 541') transmits light of the second color and light of the third color when reflecting light of the first color, and reflects light of the second color and light of the third color when transmitting light of the first color, and the second dichroic mirror (542) can reflect light of the second color and transmit light of the third color.

[0106] In addition, according to one aspect of the present disclosure, the second color light output from the plurality of second light sources (531) and reflected from the second dichroic mirror (542) is incident on the first dichroic mirror (541, 541'), and the third color light output from the plurality of third light sources (533) and transmitted through the second dichroic mirror (542) is reflected from the plurality of reflection mirrors (551, 553) and then transmitted through the second dichroic mirror (542) again and is incident on the first dichroic mirror (541, 541'), and the direction in which the second color light is incident on the first dichroic mirror (541, 541') may be different from the direction in which the third color light is incident on the first dichroic mirror (541, 541').

[0107] In addition, according to one aspect of the present disclosure, when the first dichroic mirror (541) reflects the light of the first color, the direction in which the light of the second color transmitted through the first dichroic mirror (541) is directed and the direction in which the light of the third color is directed may intersect with each other, and when the first dichroic mirror (541') transmits the light of the first color, the direction in which the light of the second color reflected from the first dichroic mirror (541') is directed and the direction in which the light of the third color is directed may intersect with each other.

[0108] Additionally, according to one aspect of the present disclosure, the first dichroic mirror (541, 541') and the second dichroic mirror (542) can be arranged parallel to each other.

[0109] Additionally, according to one aspect of the present disclosure, the first light source array (520) and the second light source array (530) can be mounted on one surface of a substrate.

[0110] In addition, according to one aspect of the present disclosure, the first light source array (520) and the second light source array (530) may be arranged in parallel along a first direction, the plurality of second light sources (531) may be arranged on one side of the second light source array (530) along the second direction, and the plurality of third light sources (533) may be arranged on the other side of the second light source array (530) along the second direction.

[0111] Additionally, according to one aspect of the present disclosure, the first direction and the second direction may be perpendicular to each other.

[0112] Additionally, according to one aspect of the present disclosure, the first light source (521), the second light source (531), and the third light source (533) can emit light in a third direction perpendicular to the first direction and the second direction.

[0113] In addition, according to one aspect of the present disclosure, the plurality of reflective mirrors (551, 553) may include a first reflective mirror (551) that reflects the third color light output from the plurality of third light sources (533) and transmitted through the second dichroic mirror (542); and a second reflective mirror (553) that reflects the third color light reflected from the first reflective mirror (551) toward the second dichroic mirror (542).

[0114] The attached drawings are only intended to facilitate understanding of the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the attached drawings, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present disclosure.

[0115] Meanwhile, the operating method of the present disclosure can be implemented as processor-readable code on a processor-readable recording medium. A processor-readable recording medium includes all types of recording devices that store data that can be read by a processor. Examples of processor-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage devices, etc., and also include those implemented in the form of a carrier wave, such as transmission via the Internet. Furthermore, the processor-readable recording medium can be distributed across network-connected computer systems, so that the processor-readable code can be stored and executed in a distributed manner.

[0116] In addition, although the preferred embodiments of the present disclosure have been illustrated and described above, the present disclosure is not limited to the specific embodiments described above, and various modifications may be made by a person having ordinary skill in the art to which the present invention pertains without departing from the gist of the present disclosure as claimed in the claims, and such modifications should not be understood individually from the technical idea or prospect of the present disclosure.

Claims

1. A first light source array including a plurality of first light sources that output light of a first color; A second light source array including a plurality of second light sources outputting light of a second color and a plurality of third light sources outputting light of a third color; A first dichroic mirror arranged corresponding to the first light source array; a second dichroic mirror arranged corresponding to the second light source array; and It comprises a plurality of reflective mirrors that reflect light passing through the second dichroic mirror, The above first dichroic mirror is, When reflecting the light of the first color, transmitting the light of the second color and the light of the third color, When transmitting the light of the first color, it reflects the light of the second color and the light of the third color, The above second dichroic mirror is, A light source assembly characterized by reflecting light of the second color and transmitting light of the third color.

2. In paragraph 1, The light of the second color output from the second light sources and reflected from the second dichroic mirror is incident on the first dichroic mirror, The light of the third color output from the plurality of third light sources and transmitted through the second dichroic mirror is reflected from the plurality of reflective mirrors and then transmitted through the second dichroic mirror again and incident on the first dichroic mirror. A light source assembly, characterized in that the direction in which the light of the second color is incident on the first dichroic mirror is different from the direction in which the light of the third color is incident on the first dichroic mirror.

3. In paragraph 2, When the first dichroic mirror reflects light of the first color, the direction in which the light of the second color transmitted through the first dichroic mirror is directed and the direction in which the light of the third color is directed intersect each other, A light source assembly, characterized in that when the first dichroic mirror transmits light of the first color, the direction in which the light of the second color reflected from the first dichroic mirror faces intersects the direction in which the light of the third color faces.

4. In paragraph 2, A light source assembly, characterized in that the first dichroic mirror and the second dichroic mirror are arranged parallel to each other.

5. In paragraph 1, A light source assembly, characterized in that the first light source array and the second light source array are mounted on one surface of a substrate.

6. In paragraph 5, The first light source array and the second light source array are arranged parallel along the first direction, The above plurality of second light sources are arranged on one side of the second light source array along the second direction, A light source assembly, characterized in that the plurality of third light sources are arranged on the other side of the second light source array along the second direction.

7. In paragraph 6, A light source assembly, characterized in that the first direction and the second direction are perpendicular to each other.

8. In paragraph 7, A light source assembly, characterized in that the first light source, the second light source, and the third light source emit light in a third direction perpendicular to the first direction and the second direction.

9. In paragraph 1, The above multiple reflective mirrors are, A first reflection mirror that reflects light of the third color output from the plurality of third light sources and transmitted through the second dichroic mirror; and A light source assembly characterized by including a second reflective mirror that reflects the third color light reflected from the first reflective mirror toward the second dichroic mirror.

10. An image projection device comprising a light source assembly according to any one of claims 1 to 9.

Images