Laser display device
By introducing adjustment chips into the laser array group of laser display devices and adjusting the luminescence proportion of the red and green chips in low blue light mode, the output beam is in white equilibrium state, solving the problem of low brightness and fidelity in low blue light mode, achieving better display effects.
Patent Information
- Application Number
- CN202311401385.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-10-25
- Publication Date
- 2025-04-25
AI Technical Summary
In low blue light mode, the laser display device has low brightness, low image fidelity, and poor display effect.
A laser array group is adopted, including a red chip, a green chip, a blue chip and a adjustment chip, and the wavelength of the adjustment beam emitted by the adjustment chip is greater than the wavelength of the blue beam. When in low blue light mode, by adjusting the luminous proportion of the red chip, green chip and adjusting the chip, the output beam is in white equilibrium state, ensuring the brightness of the red beam and green beam.
The brightness of the laser display device is improved, the image fidelity is improved, and the display effect is improved.
Smart Images
Figure CN119890928A_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present application relate to the field of display technology, and in particular to a laser display device. Background Art
[0002] Laser display devices are common electronic output devices that can convert electronic files into graphics and display the images through a screen. Laser display devices can usually be set to low blue light mode to reduce the impact of the image on human eye health. However, when the laser display device is in low blue light mode, the brightness of the laser display device is low, the image fidelity is low, and the display effect of the laser display device is poor. Summary of the invention
[0003] The embodiment of the present application provides a laser display device, which can solve the technical problems that when the laser display device is in a low blue light mode, the brightness of the laser display device is low, the image fidelity is low, and the display effect of the laser display device is poor.
[0004] In a first aspect, an embodiment of the present application provides a laser display device, comprising:
[0005] A laser array group, comprising a red chip, a green chip, a blue chip and an adjustment chip, wherein the red chip is used to emit a red light beam, the green chip is used to emit a green light beam, the blue chip is used to emit a blue light beam, and the adjustment chip is used to emit an adjustment light beam, wherein the wavelength of the adjustment light beam is greater than the wavelength of the blue light beam;
[0006] The light combining structure is used to receive the red light beam, the green light beam, the blue light beam and the adjustment light beam from the laser array group, and combine the red light beam, the green light beam, the blue light beam and the adjustment light beam to form an output light beam.
[0007] The laser display device of the embodiment of the present application, wherein the laser array group includes a red chip, a green chip, a blue chip and an adjustment chip, the red chip is used to emit a red light beam, the green chip is used to emit a green light beam, the blue chip is used to emit a blue light beam, and the adjustment chip is used to emit an adjustment light beam, and the wavelength of the adjustment light beam is greater than the wavelength of the blue light beam;
[0008] When the laser display device is in a low blue light mode, the blue light beam in the output light beam is reduced, so that the proportion of blue light beams emitted by the blue chip in the laser array is reduced; the light emission proportions of the red chip, the green chip and the adjustment chip in the laser array can be adjusted to make the output light beam in a white balance state, so that the adjustment method of the output light beam of the laser display device is more diverse; and, compared with the laser display device in the related art that can only reduce the brightness of the red light beam and the green light beam to make the output light beam in a white balance state, the laser display device provided in the embodiment of the present application can ensure the brightness of the red light beam and the green light beam, thereby improving the brightness of the laser display device, improving the image fidelity, and improving the display effect of the laser display device.
[0009] In some embodiments of the present application, the adjustment chip is set as a cyan chip, and the adjustment light beam is set as a cyan light beam;
[0010] The wavelength of the red light beam is set to at least one of 632 nanometers, 639 nanometers and 647 nanometers, the wavelength of the green light beam is set to at least one of 525 nanometers and 532 nanometers, the wavelength of the blue light beam is set to 465 nanometers, and the wavelength of the cyan light beam is greater than or equal to 485 nanometers and less than or equal to 495 nanometers.
[0011] In this way, the adjustment chip is set as a cyan chip, the cyan chip is used to emit a cyan light beam, and the wavelength of the cyan light beam is set to be greater than or equal to 485 nanometers and less than or equal to 495 nanometers, which can obtain a larger green partial color gamut and a higher color gamut coverage, thereby improving the naturalness of the picture of the laser display device.
[0012] In some embodiments of the present application, the laser array group includes a plurality of chip arrays, and the chip array includes a first row of chips and a second row of chips arranged along a first direction;
[0013] One green chip, one blue chip and two red chips are arranged in sequence along the second direction to form the first row of chips; one adjustment chip, one blue chip and two red chips are arranged in sequence along the second direction to form the second row of chips.
[0014] In this way, the laser array group includes multiple chip arrays, and the multiple chip arrays can emit light periodically. In one light-emitting cycle of the chip array, the blue chip, the adjustment chip, the green chip and the red chip emit light in turn; when the laser display device is in low blue light mode, the light-emitting time of the blue chip can be reduced, the light-emitting time of the adjustment chip can be increased, and the light-emitting time of the green chip and the red chip can be adaptively adjusted to make the output light beam in a white balance state, thereby ensuring the brightness of the red light beam and the green light beam and improving the brightness of the laser display device.
[0015] In some embodiments of the present application, the laser array group includes a plurality of chip rows arranged along a first direction;
[0016] The two red chips, the one blue chip, the one green chip and a plurality of the adjustment chips are sequentially arranged along the second direction to form the chip row.
[0017] In this way, the laser array group includes multiple chip rows, and the multiple chip rows can emit light periodically. In one light-emitting cycle of the chip row, the blue chip, the adjustment chip, the green chip and the red chip emit light in turn; when the laser display device is in low blue light mode, the light-emitting time of the blue chip can be reduced, the light-emitting time of the adjustment chip can be increased, and the light-emitting time of the green chip and the red chip can be adaptively adjusted to make the output light beam in a white balance state, thereby ensuring the brightness of the red light beam and the green light beam, and improving the brightness of the laser display device.
[0018] In some embodiments of the present application, the laser array group includes a first part and a second part arranged along the second direction;
[0019] The red chip, the green chip, and the blue chip form a first part of the laser array group, and the adjustment chip forms a second part of the laser array group.
[0020] In this way, by setting the laser array group to include a first part and a second part, the red chip, the green chip, and the blue chip form the first part of the laser array group, and the adjustment chip forms the second part of the laser array group, so that the setting method of the laser array group is more flexible.
[0021] In some embodiments of the present application, the light combining structure includes a reflective component, an adjustment component and a light guide which are arranged in sequence;
[0022] The reflective assembly comprises a first reflective member, a second reflective member and a third reflective member arranged in sequence along the second direction, the first reflective member is used to reflect the green light beam and the adjustment light beam, the second reflective member is used to reflect the blue light beam, and the third reflective member is used to reflect the red light beam;
[0023] The adjustment component comprises a telescope, a diffuser and a focusing component arranged in sequence along the second direction, so that the red light beam, the green light beam, the blue light beam and the adjustment light beam from the reflection component pass through the telescope, the diffuser and the focusing component in sequence and then converge;
[0024] The first end of the light guide receives the red light beam, the green light beam, the blue light beam and the adjustment light beam from the focusing element, and the second end of the light guide is used to output the output light beam.
[0025] In this way, when the laser array group emits a red light beam, a green light beam, a blue light beam and an adjustment light beam, the first reflector reflects the green light beam and the adjustment light beam, the second reflector is used to reflect the blue light beam, and the third reflector is used to reflect the red light beam, so that the function of the first reflector is more abundant;
[0026] The adjusting component converges the red light beam, the green light beam, the blue light beam and the adjusting light beam from the reflecting component and transmits them to the light guide, so as to output the converged output light beam through the second end of the light guide.
[0027] In some embodiments of the present application, the light combining structure includes a reflective component, an adjustment component and a light guide which are arranged in sequence;
[0028] The reflective assembly comprises a first reflective member, a second reflective member, a third reflective member and a fourth reflective member arranged in sequence along the second direction, the first reflective member is used to reflect the green light beam, the second reflective member is used to reflect the blue light beam, the third reflective member is used to reflect the red light beam, and the fourth reflective member is used to reflect the adjustment light beam;
[0029] The adjustment component comprises a telescope, a diffuser and a focusing component arranged in sequence along the second direction, so that the red light beam, the green light beam, the blue light beam and the adjustment light beam from the reflection component are converged after passing through the telescope, the diffuser and the focusing component in sequence;
[0030] The first end of the light guide receives the red light beam, the green light beam, the blue light beam and the adjustment light beam from the focusing element, and the second end of the light guide is used to output the output light beam.
[0031] With such arrangement, when the laser array group emits a red light beam, a green light beam, a blue light beam and an adjustment light beam, the first reflector reflects the green light beam, the second reflector is used to reflect the blue light beam, the third reflector is used to reflect the red light beam, and the fourth reflector is used to reflect the adjustment light beam;
[0032] The adjusting component converges the red light beam, the green light beam, the blue light beam and the adjusting light beam from the reflecting component and transmits them to the light guide, so as to output the converged output light beam through the second end of the light guide.
[0033] In a second aspect, an embodiment of the present application provides a laser display device, including a laser array group and a light combining structure;
[0034] The laser array group includes a red chip, a green chip, a blue chip and an adjustment chip, wherein the red chip is used to emit a red light beam, the green chip is used to emit a green light beam, the blue chip is used to emit a blue light beam, and the adjustment chip is used to emit an adjustment light beam, wherein the wavelength of the adjustment light beam is greater than the wavelength of the blue light beam;
[0035] The light combining structure receives the red light beam, the green light beam, the blue light beam and the adjustment light beam from the laser array group, and combines the red light beam, the green light beam, the blue light beam and the adjustment light beam into an output light beam;
[0036] When the laser display device is in a low blue light mode, the laser array group is configured to adjust the red chip, the green chip and the adjustment chip so that the output light beam is in a white balance state.
[0037] In the laser display device of the embodiment of the present application, when the laser display device is in a low blue light mode, the blue light beam in the output light beam is reduced, so that the proportion of the blue light beam emitted by the blue chip in the laser array is reduced;
[0038] The output light beam can be placed in a white balance state by adjusting the light emission proportions of the red chip, the green chip and the adjustment chip in the laser array, thereby making the adjustment method of the output light beam of the laser display device more diverse; and, compared with the laser display device in the related art which can only reduce the brightness of the red light beam and the green light beam to place the output light beam in a white balance state, the laser display device provided in the embodiment of the present application can ensure the brightness of the red light beam and the green light beam, thereby improving the brightness of the laser display device, improving the image fidelity, and improving the display effect of the laser display device.
[0039] In some embodiments of the present application, the laser array group emits light periodically, and in one light-emitting period of the laser array group, the blue chip, the adjustment chip, the green chip and the red chip emit light in sequence;
[0040] The laser display device also includes a conventional light-emitting mode, and the light-emitting duration of the blue chip when in the low blue light mode is shorter than the light-emitting duration of the blue chip when in the conventional light-emitting mode; the light-emitting duration of the adjustment chip when in the low blue light mode is longer than the light-emitting duration of the adjustment chip when in the conventional light-emitting mode.
[0041] With such an arrangement, the laser array group can emit light periodically. Within one light-emitting cycle of the laser array group, the blue chip, the adjustment chip, the green chip and the red chip emit light in turn. When the laser display device is in low blue light mode, the light-emitting time of the blue chip can be reduced, the light-emitting time of the adjustment chip can be increased, and the light-emitting time of the green chip and the red chip can be adaptively adjusted to make the output light beam in a white balance state, thereby ensuring the brightness of the red light beam and the green light beam and improving the brightness of the laser display device.
[0042] In some embodiments of the present application, a processor, a light sensing module and a driving module are further included, wherein the light sensing module is electrically connected to the processor, and the processor is electrically connected to the control end of the driving module;
[0043] The light sensing module obtains the light intensity of the environment where the laser display device is located and forms an electrical signal;
[0044] The processor is at least used to obtain the electrical signal, and determine that the laser display device is in the regular light emitting mode or the low blue light mode according to the electrical signal;
[0045] If the processor determines that the laser display device is switched from the conventional light-emitting mode to the low blue light mode, the processor controls the driving module, the driving module shortens the light-emitting time of the blue chip in a light-emitting cycle, and the driving module extends the light-emitting time of the regulating chip in a light-emitting cycle.
[0046] In this configuration, the light sensing module obtains the light intensity of the environment in which the laser display device is located, and converts the light signal into an electrical signal. The light sensing module transmits the electrical signal to the processor, and the processor determines whether the laser display device is in the normal light emission mode or the low blue light mode through the electrical signal from the light sensing module.
[0047] If the light intensity decreases, the processor can determine that the laser display device is switched from the conventional light-emitting mode to the low blue light mode, and control the driving module, thereby shortening the light-emitting time of the blue chip in a light-emitting cycle through the driving module, and extending the light-emitting time of the adjustment chip in a light-emitting cycle through the driving module, so that the output light beam is in a white balance state, thereby ensuring the brightness of the red light beam and the green light beam, and improving the brightness of the laser display device. BRIEF DESCRIPTION OF THE DRAWINGS
[0048] In order to more clearly illustrate the implementation methods in the embodiments of the present application or the related technologies, the following is a brief introduction to the drawings required for use in the embodiments or the related technology descriptions. Obviously, the drawings described below are some embodiments of the present application, and a person skilled in the art can also obtain other drawings based on these drawings.
[0049] Figure 1 A schematic diagram of the structure of a laser display device with a chip array according to an embodiment of the present application;
[0050] Figure 2 A schematic diagram of the structure of a laser array group having a chip array according to an embodiment of the present application;
[0051] Figure 3 A schematic diagram of the structure of a laser display device for displaying an adjustment chip according to an embodiment of the present application;
[0052] Figure 4 This is a schematic diagram comparing the color gamut of the four-primary-color light source of the embodiment of the present application with the color gamut of the three-primary-color light source and the standard color gamut;
[0053] Figure 5 A schematic diagram of the structure of a laser array group having a chip row according to an embodiment of the present application;
[0054] Figure 6 This is a schematic structural diagram of a laser array group having a chip row in another implementation manner of the present application;
[0055] Figure 7 A schematic diagram of the structure of a laser display device with a chip row according to an embodiment of the present application;
[0056] Figure 8 This is a schematic diagram of the structure of a processor, a light sensing module, a driving module, and a time control module of a laser display device according to an embodiment of the present application;
[0057] Fig. 9 This is a timing diagram of the laser array group when the laser display device according to the embodiment of the present application is in a normal light-emitting mode;
[0058] Fig.10 This is a timing diagram of the laser array group when the laser display device according to an embodiment of the present application is in a low blue light mode.
[0059] Description of reference numerals:
[0060] 100. Laser array group;
[0061] 110a, chip array; 110b, chip row; 111, red chip; 112, green chip; 113, blue chip; 114, adjustment chip;
[0062] 200, light combining structure;
[0063] 210, reflective component; 211, first reflective component; 212, second reflective component; 213, third reflective component; 214, fourth reflective component; 220, adjustment component; 221, telescope component; 222, diffuser; 223, focusing component; 230, light guide component;
[0064] 300, processor;
[0065] 400, drive module;
[0066] 500, light sensing module;
[0067] 600. Time control module. DETAILED DESCRIPTION
[0068] As described in the background technology, in the related art, a laser display device is a common electronic output device that can convert electronic files into graphics and display the images through a screen. With the continuous development of display technology, the safety of laser display devices has also received more and more attention. For example, laser display devices usually work based on a three-primary color system, that is, a red light beam, a green light beam and a blue light beam are emitted through a laser array group, and the red light beam, the green light beam and the blue light beam are converged through a light combining structure to form an output light beam to display the picture.
[0069] It should be noted that in the output light beam formed by the laser display device, the blue light beam with a wavelength greater than 415 nanometers and less than 460 nanometers will cause certain damage to the human eye, especially for young children, whose retina has a transmittance of more than 65% for blue light beams, making the harm of blue light beams to young children more serious than that to adults.
[0070] For this reason, laser display devices are usually provided with a low blue light mode to reduce the damage of the output light beam to the human eye by reducing the proportion of the blue light beam in the output light beam. However, simply reducing the proportion of the blue light beam will cause the white point coordinates to deviate from the Planck black body trajectory, affecting the color fidelity of the image; and in order to ensure that the output light beam of the laser display device is in a white balance state, when the laser display device is in the low blue light mode, it is usually necessary to adaptively reduce the brightness of the red light beam and the green light beam, resulting in low brightness of the laser display device and poor display effect of the laser display device.
[0071] In view of this, in the laser display device of the embodiment of the present application, the laser array group includes a red chip, a green chip, a blue chip and an adjustment chip, the red chip is used to emit a red light beam, the green chip is used to emit a green light beam, the blue chip is used to emit a blue light beam, and the adjustment chip is used to emit an adjustment light beam, and the wavelength of the adjustment light beam is greater than the wavelength of the blue light beam;
[0072] When the laser display device is in the low blue light mode, the proportion of the adjustment beam in the output beam can be increased by adjusting the light emission proportions of the red chip, the green chip and the adjustment chip in the laser array, and the proportions of the red beam and the green beam in the output beam can be adaptively adjusted to make the output beam in a white balance state;
[0073] Compared with the laser display device in the related art that can only reduce the brightness of the red light beam and the green light beam to make the output light beam in a white balance state, the laser display device provided in the embodiment of the present application can make the adjustment method of the output light beam more diverse and can ensure the brightness of the red light beam and the green light beam, thereby improving the brightness of the laser display device, improving the image fidelity, and improving the display effect of the laser display device.
[0074] In order to make the purpose, implementation mode and advantages of the present application clearer, the exemplary implementation mode of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, rather than all the embodiments.
[0075] It should be noted that the brief description of terms in this application is only for the convenience of understanding the embodiments described below, and is not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their common and usual meanings.
[0076] In addition, the terms "include" and "have" and any variations thereof are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to those components expressly listed but may include other components not expressly listed or inherent to such products or devices.
[0077] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0078] The terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.
[0079] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0080] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0081] Reference Figure 1-Figure 3 The embodiment of the present application provides a laser display device, including a laser array group 100 and a light combining structure 200, wherein the laser array group 100 includes a red chip 111 (i.e. Figure 1 and Figure 2 L1 in), green chip 112 (i.e. Figure 1 and Figure 2 L2 in), blue chip 113 (i.e. Figure 1 and Figure 2 L3 in) and the regulating chip 114 (ie Figure 2 and Figure 3 L4), the red chip 111 is used to emit a red light beam, the green chip 112 is used to emit a green light beam, the blue chip 113 is used to emit a blue light beam, and the adjustment chip 114 is used to emit an adjustment light beam, and the wavelength of the adjustment light beam is greater than the wavelength of the blue light beam.
[0082] Exemplarily, the light combining structure 200 is used to receive the red light beam, green light beam, blue light beam and adjustment light beam from the laser array group 100, and combine the red light beam, green light beam, blue light beam and adjustment light beam to form an output light beam to display a picture through the output light beam.
[0083] In some possible embodiments, the wavelength of the adjusted light beam can be close to the wavelength set to the blue light beam, that is, the color of the adjusted light beam can be close to the blue light beam; for example, the adjustment chip 114 can be set to a cyan chip, and the adjusted light beam is set to a cyan light beam, so that the adjustment method of the output light beam is more diverse by setting the cyan chip, and a larger green partial color gamut and a higher BT2020 color gamut coverage can be obtained, thereby improving the naturalness of the picture of the laser display device.
[0084] Among them, BT2020 color gamut refers to a wide color gamut (WCG) standard developed by the International Telecommunication Union (ITU), also known as the Ultra HD Premium color gamut. The BT2020 color gamut is a wider color range that can display more colors than traditional standard color gamuts (such as sRGB or Rec.709).
[0085] The definition of the BT2020 color gamut is based on the CIE1931 chromaticity diagram and covers a wider chromaticity range. The color gamut area of the BT2020 color gamut is much larger than the traditional standard color gamut, which can present brighter and more saturated colors; and, compared with the traditional standard color gamut, the red and green of the BT2020 color gamut are particularly prominent, and a wider variety of red and green colors can be presented.
[0086] The BT2020 color gamut can be applied to high dynamic range (HDR) video and display technologies, such as video production and post-processing; the BT2020 color gamut can provide richer color expression and more realistic image quality, making the BT2020 color gamut suitable for various display devices such as TVs, projectors and monitors.
[0087] Exemplarily, in the laser array group 100, the wavelength of the red light beam emitted by the red chip 111 can be set to at least one of 632 nanometers, 639 nanometers and 647 nanometers, the wavelength of the green light beam emitted by the green chip 112 can be set to at least one of 525 nanometers and 532 nanometers, and the wavelength of the blue light beam emitted by the blue chip 113 can be set to 465 nanometers.
[0088] The wavelength of the cyan light beam emitted by the cyan chip can be greater than or equal to 485 nanometers and less than or equal to 495 nanometers. For example, the wavelength of the cyan light beam can be set to 495 nanometers so that the cyan light beam can be based on the color coordinates of the standard cyan of the BT2020 color gamut, thereby improving the naturalness of the picture of the laser display device. In addition, the cyan light beam with a wavelength set to 495 nanometers can reduce the impact on the circadian rhythm, inhibit the secretion of melatonin to a very small extent, and ensure the user's normal sleep.
[0089] By adopting the above technical solution, when the laser display device is in the low blue light mode, the light emission proportions of the red chip 111, the green chip 112 and the cyan chip in the laser array can be adjusted. For example, the proportion of the cyan light beam in the output light beam can be increased, and the proportions of the red light beam and the green light beam in the output light beam can be adaptively adjusted to make the output light beam in a white balance state, thereby ensuring the brightness of the laser display device.
[0090] It should be noted that white balance is an indicator that describes the accuracy of white after the three primary colors of red, green and blue are mixed in the display device. It can be used to solve a series of problems in color reproduction and tone processing. In the laser display device, the white field coordinate point of the output light beam needs to satisfy the white center point color coordinate formula so that the output light beam can be in a white balanced state.
[0091] In the related art, when the laser display device is in a low blue light mode, the proportion of the blue light beam decreases and the brightness of the blue light beam decreases. In order to make the output light beam of the laser display device in a white balance state, and because the white balance of the three-primary color light source usually has only a unique solution, it is usually necessary to reduce the brightness of the red light beam and the green light beam, so that the brightness of the laser display device is reduced and the display effect of the laser display device is poor.
[0092] Reference Figure 4 In the embodiment of the present application, by adding an adjustment beam emitted by the adjustment chip 114 to the output beam, the adjustment beam can be added to the white center point color coordinate formula to convert the three-primary color light source white balance into the four-primary color light source white balance; when the laser display device is in the low blue light mode, compared with the three-primary color light source white balance, the four-primary color light source white balance has more solutions, making the adjustment method of the output beam more diverse, and can ensure the brightness of the red beam and the green beam by increasing the proportion of the adjustment beam in the output beam, thereby ensuring the brightness of the laser display device.
[0093] Reference Figure 2 In some possible implementations, the laser array group 100 may include a plurality of chip arrays 110a, and the plurality of chip arrays 110a may be arranged in a plurality of rows and columns, or the plurality of chip arrays 110a may be arranged sequentially along a first direction, and each chip array 110a includes four red chips 111, two blue chips 113, one green chip 112, and one adjustment chip 114.
[0094] For example, the chip array 110a may include a first direction (ie, Figure 2 The first row of chips and the second row of chips are arranged along the second direction (i.e., the y direction), a green chip 112, a blue chip 113 and two red chips 111 are arranged along the second direction (i.e., Figure 2 and, an adjustment chip 114, a blue chip 113 and two red chips 111 are arranged in sequence along a second direction to form a second row of chips, wherein the first direction may be perpendicular to the second direction.
[0095] Or, refer to Figure 5 and Figure 6In some possible implementations, the laser array group 100 may further include a plurality of chip rows 110b arranged along a first direction, wherein two red chips 111, a blue chip 113, a green chip 112, and a plurality of adjustment chips 114 are sequentially arranged along a second direction to form a chip row 110b, wherein the first direction may be perpendicular to the second direction.
[0096] In the chip row 110b, the number of the adjustment chips 114 can be adjusted according to actual usage, for example, referring to Figure 5 , the number of the regulating chips 114 can be set to four, or, referring to Figure 5 The number of the regulating chips 114 may also be set to two.
[0097] Exemplarily, the laser array group 100 may be configured as an integrated structure, wherein a plurality of red chips 111 , a plurality of green chips 112 , a plurality of blue chips 113 and a plurality of adjustment chips 114 together form a laser array of an integrated structure.
[0098] Or, refer to Figure 7 The laser array group 100 may include a first part and a second part arranged along the second direction; the red chip 111, the green chip 112, and the blue chip 113 form the first part of the laser array group 100, and the adjustment chip 114 forms the second part of the laser array group 100, so that the setting method of the laser array group 100 is more flexible.
[0099] The multiple red chips 111 , the multiple green chips 112 , the multiple blue chips 113 and the multiple adjustment chips 114 may also be arranged in other ways to form the laser array group 100 , and the embodiment of the present application does not impose any further limitation on this.
[0100] By adopting the above technical solution, multiple chip rows 110b or multiple chip arrays 110a can emit light periodically. Within a light-emitting cycle of the chip row 110b or the chip array 110a, the blue chip 113, the adjustment chip 114, the green chip 112 and the red chip 111 emit light in sequence; when the laser display device is in a low blue light mode, the light-emitting time of the blue chip 113 can be reduced, the light-emitting time of the adjustment chip 114 can be increased, and the light-emitting time of the green chip 112 and the red chip 111 can be adaptively adjusted to make the output light beam in a white balance state, thereby ensuring the brightness of the red light beam and the green light beam, and improving the brightness of the laser display device.
[0101] Reference Figure 3 and Figure 7In some possible embodiments, the light-combining structure 200 may include a reflective component 210, an adjustment component 220, and a light guide 230 that are arranged in sequence, so as to receive the red light beam, the green light beam, the blue light beam, and the adjustment light beam from the multiple chip arrays 110a through the reflective component 210, and reflect them to the adjustment component 220, and the adjustment component 220 converges the red light beam, the green light beam, the blue light beam, and the adjustment light beam from the reflective component 210 and transmits them to the light guide 230, thereby outputting the converged output light beam through the light guide 230.
[0102] For example, the number and arrangement of the reflective components 210 may be determined according to the position and number of each chip in the chip array 110a; for example, referring to Figure 3 When the laser array group 100 includes multiple chip arrays 110a, the reflective component 210 may include a first reflective member 211, a second reflective member 212 and a third reflective member 213 arranged in sequence along the second direction, the first reflective member 211 can be used to reflect a green light beam and an adjustment light beam, the second reflective member 212 can be used to reflect a blue light beam, and the third reflective member 213 can be used to reflect a red light beam, so as to change the directions of the red light beam, the green light beam, the blue light beam and the adjustment light beam through the reflective component 210 and reflect them to the adjustment component 220.
[0103] Furthermore, the first reflector 211 can be used to reflect the green light beam and the adjustment light beam at the same time, so that the function of the first reflector 211 is more abundant and the structure of the reflective assembly 210 is simpler.
[0104] It should be noted that in the second direction, the green light beam and the cyan light beam reflected by the first reflector 211 need to pass through the second reflector 212 and the third reflector 213 in sequence to propagate to the adjustment component 220, and the blue light beam reflected by the second reflector 212 needs to pass through the third reflector 213 to propagate to the adjustment component 220.
[0105] Exemplarily, the second reflector 212 and the third reflector 213 can both be configured as two-way filters, wherein the minimum transmittance wavelength of the second reflector 212 is greater than the wavelength of the blue light beam, and the maximum transmittance wavelength of the third reflector 213 can be less than the wavelength of the red light beam, so that the green light beam and the adjustment light beam with wavelengths greater than the blue light beam and smaller than the red light beam can pass through the second reflector 212 and the third reflector 213 in sequence, and the blue light beam with a wavelength smaller than the red light beam can pass through the third reflector 213, thereby changing the directions of the red light beam, the green light beam, the blue light beam and the adjustment light beam through the reflection component 210.
[0106] Reference Figure 7When the laser array group 100 includes multiple chip rows 110b, the reflective component 210 may include a first reflective member 211, a second reflective member 212, a third reflective member 213 and a fourth reflective member 214 arranged in sequence along the second direction, the first reflective member 211 is used to reflect a green light beam, the second reflective member 212 is used to reflect a blue light beam, the third reflective member 213 is used to reflect a red light beam, and the fourth reflective member 214 is used to reflect an adjustment light beam; so as to change the directions of the red light beam, the green light beam, the blue light beam and the adjustment light beam through the reflective component 210 and reflect them to the adjustment component 220.
[0107] It should be noted that, in the second direction, the green light beam reflected by the first reflector 211 needs to sequentially pass through the second reflector 212, the third reflector 213 and the fourth reflector 214 to propagate to the adjustment component 220, and the blue light beam reflected by the second reflector 212 needs to pass through the third reflector 213 and the fourth reflector 214 to propagate to the adjustment component 220;
[0108] Exemplarily, the second reflector 212, the third reflector 213 and the fourth reflector 214 can all be configured as dichroic filters, wherein the minimum permeable wavelength of the second reflector 212 is greater than the wavelength of the blue light beam, and the maximum permeable wavelength of the third reflector 213 can be less than the wavelength of the red light beam, so that a green light beam with a wavelength greater than the blue light beam and a wavelength less than the red light beam can sequentially pass through the second reflector 212 and the third reflector 213, and a blue light beam with a wavelength less than the red light beam can pass through the third reflector 213;
[0109] The fourth reflector 214 can be used to reflect light beams with wavelengths greater than or equal to 495 nanometers and less than or equal to 505 nanometers, so that the fourth reflector 214 can be used to transmit the red light beam, the green light beam and the blue light beam, and the fourth reflector 214 can be used to reflect the adjustment light beam, thereby changing the directions of the red light beam, the green light beam, the blue light beam and the adjustment light beam through the reflection component 210.
[0110] Reference Figure 3 and Figure 7 In some possible embodiments, the adjustment component 220 includes a telescope 221, a diffuser 222 and a focusing component 223 arranged in sequence along the second direction, so that the red light beam, the green light beam, the blue light beam and the adjustment light beam from the reflection component 210 pass through the telescope 221, the diffuser 222 and the focusing component 223 in sequence and then converge, so that they can propagate toward the first end of the light guide 230.
[0111] Among them, the telescope 221 can adjust the red light beam, green light beam, blue light beam and adjustment light beam from the reflection component 210 to form a parallel light beam, and the diffuser 222 can diffuse the parallel light beam from the telescope 221, so as to improve the decoherence effect to reduce the speckle contrast of the parallel light beam; the focusing element 223 can be used to converge the parallel light beams from the diffuser 222, and can make the converged light beams toward the first end of the light guide element 230.
[0112] The first end of the light guide 230 receives the light beam from the focusing element 223, and the second end of the light guide 230 is used to output the formed output light beam, so that the red light beam, green light beam, blue light beam and adjustment light beam from the reflective component 210 can be combined into an output light beam through the light combining structure 200.
[0113] Reference Figure 8 In some possible implementations, the laser display device may have a normal light-emitting mode and a low blue light mode, and the laser display device may further include a processor 300, a light sensing module 500 and a driving module 400, the light sensing module 500 is electrically connected to the processor 300, and the processor 300 is electrically connected to the control end of the driving module 400.
[0114] The light sensing module 500 can obtain the light intensity of the environment in which the laser display device is located, and convert the optical signal into an electrical signal. The light sensing module 500 transmits the electrical signal to the processor 300. The processor 300 determines whether the laser display device is in a regular light-emitting mode or a low blue light mode through the electrical signal from the light sensing module 500. In addition, the processor 300 can also determine whether the laser display device is in a regular light-emitting mode or a low blue light mode by obtaining the user's instructions. The embodiments of the present application do not impose further restrictions on this.
[0115] If the light intensity decreases or the processor 300 obtains a user instruction, the processor 300 can determine that the laser display device is switched from a conventional light-emitting mode to a low blue light mode, and control the driving module 400, thereby shortening the light-emitting time of the blue chip 113 in a light-emitting cycle through the driving module 400, and extending the light-emitting time of the adjustment chip 114 in a light-emitting cycle through the driving module 400, so that the output light beam is in a white balance state, thereby ensuring the brightness of the red light beam and the green light beam, and improving the brightness of the laser display device.
[0116] To summarize, the laser array group 100 includes a red chip 111, a green chip 112, a blue chip 113 and an adjustment chip 114, wherein the red chip 111 is used to emit a red light beam, the green chip 112 is used to emit a green light beam, the blue chip 113 is used to emit a blue light beam, and the adjustment chip 114 is used to emit an adjustment light beam, the wavelength of the adjustment light beam is greater than the wavelength of the blue light beam, so as to convert the white balance of the three-primary color light source into the white balance of the four-primary color light source.
[0117] When the laser display device is in the low blue light mode, the proportion of the adjustment beam in the output beam can be increased by adjusting the light emission proportions of the red chip 111, the green chip 112 and the adjustment chip 114 in the laser array, and the proportions of the red beam and the green beam in the output beam can be adaptively adjusted to make the output beam in a white balance state;
[0118] Compared with the laser display device in the related art that can only reduce the brightness of the red light beam and the green light beam to make the output light beam in a white balance state, the laser display device provided in the embodiment of the present application can use the four-primary color light source to make the adjustment method of the output light beam more diverse, and can ensure the brightness of the red light beam and the green light beam, thereby improving the brightness of the laser display device, improving the image fidelity, and improving the display effect of the laser display device.
[0119] For example, taking the indoor light intensity on a sunny day as greater than or equal to 100xl and less than or equal to 1000xl, when the light intensity of the environment in which the laser display device is located is greater than or equal to 100xl, the laser display device can be set to a normal light-emitting mode; when the light intensity of the environment in which the laser display device is located is less than 100xl, the laser display device can be set to a low blue light mode; and the normal light-emitting mode and the low blue light mode set to the laser display device can also be determined according to user command instructions, and the embodiments of the present application do not impose further restrictions on this.
[0120] Reference Fig. 9 The laser array group 100 can emit light periodically. In one light-emitting period of the laser array group 100, the blue chip 113, the adjustment chip 114, the green chip 112 and the red chip 111 emit light in sequence, wherein the blue chip 113 emits light in the t1 period, and the wavelength of the blue light beam emitted by the blue chip 113 is set to 465 nanometers, the adjustment chip 114 emits light in the t2 period, and the wavelength of the adjustment light beam emitted by the adjustment chip 114 is set to 495 nanometers, the green chip 112 emits light in the t3 period, and the wavelength of the green light beam emitted by the green chip 112 is set to 525 nanometers, and the red chip 111 emits light in the t4 period, and the wavelength of the red light beam emitted by the red chip 111 is set to 639 nanometers.
[0121] Reference Fig. 9 When the laser display device is in the normal light-emitting mode, in one light-emitting cycle of the laser array group 100, the blue chip 113, the adjustment chip 114, the green chip 112 and the red chip 111 emit light in sequence; when the laser display device is switched from the normal light-emitting mode to the low blue light mode, refer to Figure 8 and Fig.10The processor 300 can control the driving module 400, thereby shortening the light-emitting duration of the blue chip 113 in a light-emitting cycle through the driving module 400, and extending the light-emitting duration of the adjustment chip 114 in a light-emitting cycle through the driving module 400, and the driving module 400 adaptively adjusts the light-emitting duration of the green chip 112 and the red chip 111 in a light-emitting cycle, so as to utilize the four-primary color light source to make the output light beam in a white balance state.
[0122] The laser array group 100 includes a red chip 111, a green chip 112, a blue chip 113 and an adjustment chip 114. Under the white balance condition of the four-primary color light source, the white center point color coordinate (x, y) formula of the laser display device in the embodiment of the present application can be set as:
[0123]
[0124]
[0125] Wherein, Yr represents the laser brightness of the red light beam, Yg represents the laser brightness of the green light beam, Yb represents the laser brightness of the blue light beam, and Yc represents the laser brightness of the adjustment light beam; (x r ,y r ) represents the color coordinate of the red light beam, (x g ,y g ) represents the color coordinate of the green light beam, (x b ,y b ) represents the color coordinate of the blue light beam, (x c ,y c ) represents the color coordinates of the modulated light beam.
[0126] It is easy to understand that from the above-mentioned white center point color coordinate (x, y) formula, by adding an adjustment beam emitted by the adjustment chip to the output light beam, it is possible to add conditions such as the laser brightness of the adjustment beam to the white center point color coordinate formula, so as to be able to convert the three-primary color light source white balance into the four-primary color light source white balance, making the adjustment process of the output light beam in a white balance state easier.
[0127] When the laser display device is in low blue light mode, compared with the three-primary-color light source white balance, the four-primary-color light source white balance can have more solutions to maintain the white field coordinates without deviating from the Planck black body trajectory, and can ensure the brightness of the red and green light beams by increasing the proportion of the adjustment light beam in the output light beam, thereby ensuring the brightness of the laser display device and improving the display effect of the laser display device.
[0128] Exemplarily, the ratio of the blue light hazard weighted radiation flux to the corresponding radiation power BLHER may conform to the following formula:
[0129]
[0130] Among them, B(λ) is set as the blue light hazard weighting function, S(λ) is set as the spectral radiation brightness, and BLHER describes the proportion of the light power emitted by the light source, that is, the degree of blue light risk.
[0131] Table 1 below is a schematic diagram of the correspondence between blue light wavelength, blue light hazard weighting function and thermal hazard function R(λ).
[0132]
[0133]
[0134] Table 1
[0135] When the light intensity of the environment in which the laser display device is located is lower than 100xl, in this state, if the laser display device is in low blue light mode, it can be supplemented by an adjustment light beam with a wavelength of 495nm. As shown in Table 1, the shorter the wavelength, the greater the blue light hazard weighting function, that is, the stronger the blue light hazard. The 495nm adjustment light beam has less blue light hazard than the short-wavelength blue light beam. At the same time, the adjustment light beam can reduce the impact of the output light beam on the user's circadian rhythm, slightly inhibit the secretion of melatonin, and ensure the user's normal sleep.
[0136] In addition, it can be supplemented by an adjusted light beam with a wavelength of 495nm, which can reduce the difference between the brightness of the laser display device and the light intensity of the environment, reduce the degree of stimulation of the laser display device to the human eye, reduce the brightness value of each color laser, and maintain the white balance state.
[0137] It is easy to understand that the evaluation of the degree of blue light hazard is not only related to the wavelength and proportion of blue light, but also closely related to the exposure time of the blue light beam. In order to prevent long-term exposure to blue light beams and cause photochemical damage to the retina, the energy after the spectral radiance of the light source and the integration of the blue light hazard weighting function B(λ) cannot exceed the following formula:
[0138]
[0139] Among them, t is the irradiation time of the blue light beam. It is easy to understand that the laser display device can also include a time control module 600, which is electrically connected to the processor 300. The time control module 600 can be preset with a set value. When the working time of the laser display device reaches the set value, the time control module 600 sends a signal to the processor 300 to enable the processor 300 to determine that the laser display device is converted from a normal light-emitting mode to a low blue light mode.
[0140] The embodiment of the present application provides a laser display device, including a laser array group 100 and a light combining structure 200; the laser array group 100 includes a red chip 111, a green chip 112, a blue chip 113 and an adjustment chip 114, the red chip 111 is used to emit a red light beam, the green chip 112 is used to emit a green light beam, the blue chip 113 is used to emit a blue light beam, and the adjustment chip 114 is used to emit an adjustment light beam, and the wavelength of the adjustment light beam is greater than the wavelength of the blue light beam.
[0141] The light combining structure 200 receives the red light beam, green light beam, blue light beam and adjustment light beam from the laser array group 100, and combines the red light beam, green light beam, blue light beam and adjustment light beam into an output light beam; the arrangement of the laser array group 100 and the light combining structure 200 can refer to the above, and the embodiments of the present application will not be repeated here
[0142] When the laser display device is in the low blue light mode, the laser array group 100 is configured to adjust the red chip 111 , the green chip 112 and the adjustment chip 114 to make the output light beam in a white balance state.
[0143] Exemplarily, the laser array group 100 emits light periodically, and within one light-emitting cycle of the laser array group 100, the blue chip 113, the adjustment chip 114, the green chip 112 and the red chip 111 emit light in sequence; the laser display device also includes a conventional light-emitting mode, and the light-emitting duration of the blue chip 113 when in the low blue light mode is less than the duration of the blue chip 113 when in the conventional light-emitting mode; the light-emitting duration of the adjustment chip 114 when in the low blue light mode is greater than the duration of the adjustment chip 114 when in the conventional light-emitting mode.
[0144] In some possible implementations, the laser display device may further include a processor 300 , a light sensing module 500 , and a driving module 400 , wherein the light sensing module 500 is electrically connected to the processor 300 , and the processor 300 is electrically connected to a control end of the driving module 400 .
[0145] The light sensing module 500 can obtain the light intensity of the environment in which the laser display device is located, and convert the optical signal into an electrical signal. The light sensing module 500 transmits the electrical signal to the processor 300. The processor 300 determines whether the laser display device is in the normal light-emitting mode or the low blue light mode through the electrical signal from the light sensing module 500; and the processor 300 can also determine whether the laser display device is in the normal light-emitting mode or the low blue light mode by obtaining the user's instructions, and the embodiments of the present application do not impose further restrictions on this.
[0146] If the light intensity decreases or the processor 300 obtains a user instruction, the processor 300 can determine that the laser display device is switched from a conventional light-emitting mode to a low blue light mode, and control the driving module 400, thereby shortening the light-emitting time of the blue chip 113 in a light-emitting cycle through the driving module 400, and extending the light-emitting time of the adjustment chip 114 in a light-emitting cycle through the driving module 400, so that the output light beam is in a white balance state, thereby ensuring the brightness of the red light beam and the green light beam, and improving the brightness of the laser display device.
[0147] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.
[0148] For the convenience of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.
Claims
1. A laser display device, characterized in that: include: A laser array group, comprising a red chip, a green chip, a blue chip and an adjustment chip, wherein the red chip is used to emit a red light beam, the green chip is used to emit a green light beam, the blue chip is used to emit a blue light beam, and the adjustment chip is used to emit an adjustment light beam, wherein the wavelength of the adjustment light beam is greater than the wavelength of the blue light beam; The light combining structure is used to receive the red light beam, the green light beam, the blue light beam and the adjustment light beam from the laser array group, and combine the red light beam, the green light beam, the blue light beam and the adjustment light beam to form an output light beam.
2. The laser display device according to claim 1, characterized in that: The adjustment chip is set to be a cyan chip, and the adjustment light beam is set to be a cyan light beam; The wavelength of the red light beam is set to at least one of 632 nanometers, 639 nanometers and 647 nanometers, the wavelength of the green light beam is set to at least one of 525 nanometers and 532 nanometers, the wavelength of the blue light beam is set to 465 nanometers, and the wavelength of the cyan light beam is greater than or equal to 485 nanometers and less than or equal to 495 nanometers.
3. The laser display device according to claim 1 or 2, characterized in that: The laser array group includes a plurality of chip arrays, and the chip array includes a first row of chips and a second row of chips arranged along a first direction; One green chip, one blue chip and two red chips are arranged in sequence along the second direction to form the first row of chips; one adjustment chip, one blue chip and two red chips are arranged in sequence along the second direction to form the second row of chips.
4. The laser display device according to claim 1 or 2, characterized in that: The laser array group includes a plurality of chip rows arranged along a first direction; The two red chips, the one blue chip, the one green chip and a plurality of the adjustment chips are sequentially arranged along the second direction to form the chip row.
5. The laser display device according to claim 4, characterized in that: The laser array group includes a first part and a second part arranged along the second direction; The red chip, the green chip, and the blue chip form a first part of the laser array group, and the adjustment chip forms a second part of the laser array group.
6. The laser display device according to claim 3, characterized in that: The light combining structure comprises a reflective component, an adjustment component and a light guide which are arranged in sequence; The reflective assembly comprises a first reflective member, a second reflective member and a third reflective member arranged in sequence along the second direction, the first reflective member is used to reflect the green light beam and the adjustment light beam, the second reflective member is used to reflect the blue light beam, and the third reflective member is used to reflect the red light beam; The adjustment component comprises a telescope, a diffuser and a focusing component arranged in sequence along the second direction, so that the red light beam, the green light beam, the blue light beam and the adjustment light beam from the reflection component pass through the telescope, the diffuser and the focusing component in sequence and then converge; The first end of the light guide receives the red light beam, the green light beam, the blue light beam and the adjustment light beam from the focusing element, and the second end of the light guide is used to output the output light beam.
7. The laser display device according to claim 4, characterized in that: The light combining structure comprises a reflective component, an adjustment component and a light guide which are arranged in sequence; The reflective assembly comprises a first reflective member, a second reflective member, a third reflective member and a fourth reflective member arranged in sequence along the second direction, the first reflective member is used to reflect the green light beam, the second reflective member is used to reflect the blue light beam, the third reflective member is used to reflect the red light beam, and the fourth reflective member is used to reflect the adjustment light beam; The adjustment component comprises a telescope, a diffuser and a focusing component arranged in sequence along the second direction, so that the red light beam, the green light beam, the blue light beam and the adjustment light beam from the reflection component pass through the telescope, the diffuser and the focusing component in sequence and then converge; The first end of the light guide receives the red light beam, the green light beam, the blue light beam and the adjustment light beam from the focusing element, and the second end of the light guide is used to output the output light beam.
8. A laser display device, characterized in that: It includes a laser array group and a light combining structure; The laser array group includes a red chip, a green chip, a blue chip and an adjustment chip, wherein the red chip is used to emit a red light beam, the green chip is used to emit a green light beam, the blue chip is used to emit a blue light beam, and the adjustment chip is used to emit an adjustment light beam, wherein the wavelength of the adjustment light beam is greater than the wavelength of the blue light beam; The light combining structure receives the red light beam, the green light beam, the blue light beam and the adjustment light beam from the laser array group, and combines the red light beam, the green light beam, the blue light beam and the adjustment light beam into an output light beam; When the laser display device is in a low blue light mode, the laser array group is configured to adjust the red chip, the green chip and the adjustment chip so that the output light beam is in a white balance state.
9. The laser display device according to claim 8, characterized in that: The laser array group emits light periodically. In one light-emitting period of the laser array group, the blue chip, the adjustment chip, the green chip and the red chip emit light in sequence. The laser display device also includes a conventional light-emitting mode, and the light-emitting duration of the blue chip when in the low blue light mode is shorter than the light-emitting duration of the blue chip when in the conventional light-emitting mode; the light-emitting duration of the adjustment chip when in the low blue light mode is longer than the light-emitting duration of the adjustment chip when in the conventional light-emitting mode.
10. The laser display device according to claim 9, characterized in that: It also includes a processor, a light sensing module and a driving module, wherein the light sensing module is electrically connected to the processor, and the processor is electrically connected to the control end of the driving module; The light sensing module obtains the light intensity of the environment where the laser display device is located and forms an electrical signal; The processor is at least used to obtain the electrical signal, and determine that the laser display device is in the regular light emitting mode or the low blue light mode according to the electrical signal; If the processor determines that the laser display device is switched from the conventional light-emitting mode to the low blue light mode, the processor controls the driving module, the driving module shortens the light-emitting time of the blue chip in a light-emitting cycle, and the driving module extends the light-emitting time of the regulating chip in a light-emitting cycle.