Display device and multi-channel display system

Abstract

The invention discloses a display device and a multi-channel display system. The display device comprises a display input channel, a display output channel, a storage unit, an ID circuit and an optical machine driving unit. The display input channel and the display output channel are used for transmitting data; the storage unit is used for storing data corresponding to the display channel of the level; the ID circuit is used for specifying a channel identifier of the display equipment; the optical-mechanical driving unit comprises a light source and an actuator; wherein one path of light machine driving unit corresponds to one path of display channel, the display device is additionally provided with the ID circuit with the channel identification, the structure is simple, cascade connection of multiple devices and multiple display channels is facilitated, and therefore the operation burden and cost of the device are reduced.

Description

Technical Field

[0001] The present invention relates to the field of projection display, and in particular to a display device and a multi-channel display system. Background Art

[0002] The imaging principle of fiber scanning display (FSD) technology is to use an actuator to drive an optical fiber to move along a predetermined two-dimensional scanning trajectory, and modulate the light source to output light corresponding to each pixel of the image to be displayed. Then, the light corresponding to each pixel of the image to be displayed is projected one by one through the optical fiber onto the projection surface to form a projected image.

[0003] In fiber-optic scanning display technology, light is transmitted between the light source and the actuator via optical fibers. With the help of optical fibers, the light source and the actuator can be distributed at a certain distance, making it very suitable for application scenarios such as in-vehicle projection. Such application scenarios usually require the display device to be small in size, high in installation flexibility, and multiple display channels to show multiple images simultaneously. However, driving multiple display channels increases the burden and cost of the equipment. Summary of the Invention

[0004] An object of the present invention is to provide a display device and a multi-channel display system for alleviating the technical problem in the prior art that driving multiple display channels increases the burden and cost of the device.

[0005] In order to achieve the above-mentioned purpose of the invention, a first aspect of an embodiment of the present invention provides a display device, which includes a display input channel, a display output channel, a storage unit, an ID circuit and an optical-mechanical driving unit; the display input channel and the display output channel are used to transmit data; the storage unit is used to store data corresponding to the display channel at this level; the ID circuit is used to specify the channel identification of the display device; the optical-mechanical driving unit includes a light source and an actuator; wherein, one optical-mechanical driving unit corresponds to one display channel.

[0006] Optionally, the device includes one or more optical-mechanical driving units.

[0007] Optionally, the storage unit includes one or more of SRAM, DRAM, Flash, ROM and eMMC.

[0008] A second aspect of an embodiment of the present invention provides a multi-channel display system, comprising a plurality of display devices, wherein the plurality of display devices are cascaded in sequence, and data is transmitted between the cascaded devices via cascade channels;

[0009] Each display device includes a display input channel, a display output channel, a storage unit, an ID circuit and an optical-mechanical driving unit; the display input channel and the display output channel are used to transmit data; the storage unit is used to store data corresponding to the display channel at this level; the ID circuit is used to specify the channel identification of the display device; the optical-mechanical driving unit includes a light source and an actuator; wherein, one optical-mechanical driving unit corresponds to one display channel.

[0010] Optionally, the system further includes a Soc unit, which is cascaded with the multiple display devices in sequence.

[0011] Optionally, the Soc unit includes any one of a CPU, a GPU, a FPGA, and an ASIC.

[0012] Optionally, the device includes one or more optical-mechanical driving units.

[0013] Optionally, the storage unit includes one or more of SRAM, DRAM, Flash, ROM and eMMC.

[0014] One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

[0015] In the solution of the embodiment of the present invention, the display device includes a display input channel, a display output channel, a storage unit, an ID circuit and an optical-mechanical driving unit; the display input channel and the display output channel are used to transmit data; the storage unit is used to store data corresponding to the display channel at this level; the ID circuit is used to specify the channel identification of the display device; the optical-mechanical driving unit includes a light source and an actuator; wherein, one optical-mechanical driving unit corresponds to one display channel, and the display device adds an ID circuit with a channel identification, which has a simple structure and is conducive to cascading multiple devices and multiple display channels, thereby reducing the operating burden and cost of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work.

[0017] Figure 1 A block diagram of an optical-mechanical driving unit of a display module in the FSD technology provided by an embodiment of the present invention;

[0018] Figure 2 A block diagram of a dual-channel display device provided by an embodiment of the present invention;

[0019] Figure 3 A schematic diagram of a dual-channel display device extending a multi-channel display system provided by an embodiment of the present invention;

[0020] Figure 4 Another schematic diagram of a dual-channel display device extending a multi-channel display system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] In the embodiment of the present invention, the optical-mechanical driving principle of each display channel is first described. Figure 1 As shown in the figure, it is a block diagram of the optical-mechanical driving unit of the display module in the FSD (fiber scanning display) technology in an embodiment of the present invention. The optical-mechanical driving unit includes three parts: actuator driving, light source modulation, and timing correspondence between the light source modulation and the actuator driving (executed by the controller).

[0023] For actuator driving, in order to make the actuator perform desired mechanical motion, the optomechanical driving unit needs to output a specific analog driving waveform.

[0024] In light source modulation, the light source generally refers to a laser light source. Laser modulation generates three channels of current based on the grayscale values of the R, G, and B color components in each pixel of the content to be displayed. The current values of the three channels are proportional to the corresponding grayscale. The currents of these three channels are used to drive the R, G, and B laser light sources respectively. The output power of the R, G, and B light sources is related to the current flowing through the laser light source. The mixing of three-color lasers of different powers through an optical machine can display dots of different colors, and the colors of these dots are directly related to the image content to be displayed. By appropriately adjusting the relationship between the light source output power and the current flowing through the laser light source, the color of the light emitted by the laser light source after mixing is ensured to be consistent with the content to be displayed, thus completing the modulation of the laser light source.

[0025] Light source modulation and actuator drive are timed to align. For a displayed image, each pixel has specific, unique coordinates within the two-dimensional space of the display. Based on the actuator's motion trajectory, when the actuator scans to its current position, the current driving the RGB laser light source is generated using the pixel's RGB grayscale at that location, effectively synchronizing actuator and light source modulation.

[0026] Please refer to Figure 2 , Figure 2 This is a block diagram of a dual-channel display device provided in an embodiment of the present invention. A dual-channel display device refers to a system with two independent display channels, each of which can be configured with different basic display characteristics such as resolution and frame rate. Each channel supports both same-source and different-source display. The dual-display channel system includes a system power supply, storage unit, dual-channel optical-mechanical drive units, Ethernet, and cascade channels.

[0027] Next, each functional module of the dual-channel display device is described.

[0028] System power is used to generate the various power nodes required for the entire system to operate. The power module can be composed of general-purpose power chips such as Buck, Boost, and LDO.

[0029] The storage unit includes the storage media required for system power-on operation, such as SRAM (Static Random-Access Memory), DRAM (Dynamic Random Access Memory), and the storage media for saving programs when the system is powered off, such as Flash, ROM (Read-Only Memory), eMMC (Embedded Multi Media Card), etc.

[0030] Optical mechanical drive unit, dual-channel display device contains two channels of optical mechanical drive unit. Optical mechanical drive unit in Figure 1 This is described in the examples.

[0031] Ethernet, dual-channel display device is designed with one Ethernet channel for connecting to the network, which can complete the reception of display content, background server connection, APP (Application) remote and other extended functions.

[0032] Cascading channels are designed to facilitate expansion of dual-channel display devices (hereinafter referred to as "devices") to 4, 6, 8, or other models with multiple channels, using a dual-channel display device (hereinafter referred to as "device"). To achieve this, the device includes cascading channels, through which each device receives display content and control commands from the previous level. This function is accomplished by the display input channel and control input channel in the device block diagram. The cascading channel is responsible for transmitting the display content and control commands required by the subsequent device to subsequent devices. This function corresponds to the display output channel and control output channel in the block diagram.

[0033] The display input and output channels are used to transmit display content, which can be either uncompressed video or image streams (raw streams) or encoded and compressed streams. When the transmitted display content is a decoded raw stream, the data bandwidth of this stream is particularly large. To reduce the demand for the hardware system's own storage bandwidth, after receiving the stream from the preceding device, the current-level device transfers the content for the two-channel display at this level to the local memory unit. The content displayed by the subsequent device is not stored at this level but is directly forwarded to the subsequent device via the display output channel. This significantly reduces the device's storage bandwidth demand.

[0034] The control input channel and the control output channel can also be implemented referring to the above principles.

[0035] ID (Identity document) circuit, for a cascade system (also known as a multi-channel display system) including multiple devices, it is necessary to allocate a master device and N slave devices, where N is an integer greater than or equal to 1. In order to complete the automatic role assignment of the master device and slave device connected in the cascade system, the solution of this embodiment introduces an ID circuit. The ID circuit does not need to distinguish between the master device and the slave device in advance, and all devices have the same role before they are not connected to the cascade system. When a device is assembled to a fixed position in combination with the whole machine assembly structure, the ID circuit of the device will automatically assign the role of the device at this level to be a master device or a slave device. It can be understood that in the embodiment of the present invention, each device has its own ID circuit, and the channel identification of the device is specified by the ID circuit to uniquely identify the device.

[0036] In one possible implementation, Figure 3 Figure 2 shows a schematic diagram of a dual-channel display device extending a multi-channel display system according to an embodiment of the present invention. Four dual-channel display devices are cascaded, with one dual-channel display device acting as the master device. Three dual-channel display devices are cascaded as slave devices, extending the display channels to eight. By cascading these dual-channel display devices and configuring different numbers of slave devices, 4-, 6-, or 8-channel multi-channel display systems can be easily implemented.

[0037] In an embodiment of the present invention, the master device is responsible for acquiring the content to be displayed and generating control commands and other data required for operation. The display content can generally be a local storage device, such as a USB (Universal Serial Bus) / SD (Secure Digital Card) / eMMC card, etc., or can be acquired through Ethernet. After acquiring the data, the master device processes the operating data of each display channel of the slave device according to the data identification strategy, adds the corresponding channel identification to the operating data of each display channel, and then transmits the data of the slave device to the next level slave device through the display output channel in the cascade channel. Each level of slave device will obtain data (display content / control commands) from the upper device (master device or slave device), and then, based on the channel identification, the slave device extracts the data belonging to the device from the acquired data and forwards the remaining data to the subsequent device through the cascade channel. In actual applications, the operating data may also include other types of data, which is not limited by the present invention.

[0038] In another possible embodiment, Figure 4 As shown, another device cascading method provided by an embodiment of the present invention, the cascaded device includes a master device and four dual-channel display devices as slave devices, expanding the display channels to 8. The aforementioned dual-channel display device, through the cascade channel, is configured to combine different numbers of slave devices, and can easily realize a 4-channel, 6-channel, or 8-channel multi-channel display system. Among them, the master device is a separate Soc (System on Chip) unit, which can be any platform such as CPU (Central Processing Unit) / GPU (Graphics Processing Unit) / FPGA (Field-Programmable Gate Array) / ASIC (Application-specific integrated circuit) that meets the performance requirements.

[0039] All features disclosed in this specification, or all steps in the disclosed methods or processes, except mutually exclusive features and / or steps, can be combined in any manner.

[0040] Any feature disclosed in this specification (including any appended claims, abstract and drawings), unless otherwise stated, may be replaced by other equivalent or similar features. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0041] The present invention is not limited to the aforementioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A display device, characterized in that: The display device includes a display input channel, a display output channel, a storage unit, an ID circuit and an optical drive unit; the display input channel and the display output channel are used to transmit data; the storage unit is used to store data corresponding to the display channel at this level; the ID circuit is used to specify the channel identification of the display device; the optical drive unit includes a light source and an actuator; wherein, one optical drive unit corresponds to one display channel.

2. The display device according to claim 1, wherein The display device includes one or more optical-mechanical driving units.

3. The display device according to claim 1, wherein The storage unit includes one or more of SRAM, DRAM, Flash, ROM and eMMC.

4. A multi-channel display system, characterized in that: The device comprises a plurality of display devices, wherein the plurality of display devices are sequentially cascaded, and data is transmitted between the cascaded devices via a cascade channel; Each display device includes a display input channel, a display output channel, a storage unit, an ID circuit and an optical-mechanical driving unit; the display input channel and the display output channel are used to transmit data; the storage unit is used to store data corresponding to the display channel at this level; the ID circuit is used to specify the channel identification of the display device; the optical-mechanical driving unit includes a light source and an actuator; wherein, one optical-mechanical driving unit corresponds to one display channel.

5. The system according to claim 4, wherein: The system further includes a Soc unit, which is cascaded with the multiple display devices in sequence.

6. The system according to claim 5, wherein: The Soc unit includes any one of a CPU, a GPU, a FPGA, and an ASIC.

7. The system according to claim 6, wherein: The display device includes one or more optical-mechanical driving units.

8. The system according to claim 5, wherein: The storage unit includes one or more of SRAM, DRAM, Flash, ROM and eMMC.

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