Driving circuit, driving circuit board and near-to-eye display equipment

Abstract

The utility model discloses a driving circuit, a driving circuit board and near-to-eye display equipment, and relates to the technical field of projection. The driving circuit comprises a plurality of monochromatic display module surfaces; the main control module is electrically connected with the plurality of display modules; the driving module is electrically connected with the main control module, and the main control module is used for inputting a displacement driving signal to the driving module; the plurality of pixel displacement modules are electrically connected with the driving module; wherein the driving module is used for driving the plurality of pixel displacement modules to shake according to a displacement driving signal so as to superpose single-color pictures displayed by each single-color display module to improve the display resolution of an image to be displayed, and the plurality of pixel displacement modules are in one-to-one correspondence with the plurality of single-color display modules. Therefore, not only can the display resolution of the image to be displayed be improved, but also a plurality of pixel displacement modules are designed to share the same driving chip, and the effects of small size, low cost and light weight can be achieved through circuit board circuit optimization design.

Description

Technical Field

[0001] The present application relates to the field of projection technology, and in particular, to a driving circuit, a driving circuit board, and a near-eye display device. Background Art

[0002] An Augmented Reality (AR) glasses is a new type of glasses for AR applications. It can display a virtual scene while displaying a real scene, and users can even interact with the virtual scene. With the development of AR glasses, users have higher requirements for just information prompts. The requirements for high-resolution, low-cost, and low-weight products have a great impact on the further development of AR glasses. Utility Model Content

[0003] The present application provides a driving circuit, a driving circuit board, and a near-eye display device.

[0004] In a first aspect, an embodiment of the present application provides a driving circuit. The driving circuit includes: a plurality of monochromatic display modules, where different monochromatic display modules are used to display pictures of different colors; a main control module, which is electrically connected to the plurality of display modules, and the main control module is used to input a monochromatic picture signal in the image to be displayed to each monochromatic display module; a driving module, which is electrically connected to the main control module, and the main control module is used to input a displacement driving signal to the driving module; a plurality of pixel displacement modules, which are electrically connected to the driving module; wherein, the driving module is used to drive the plurality of pixel displacement modules to jitter according to the displacement driving signal, so as to superimpose the monochromatic pictures displayed by each monochromatic display module to improve the display resolution of the image to be displayed, and the plurality of pixel displacement modules correspond to the plurality of monochromatic display modules one by one.

[0005] In a second aspect, an embodiment of the present application provides a driving circuit board. The driving circuit board includes a printed circuit board and the foregoing driving circuit. The driving circuit is arranged on the printed circuit board. The plurality of monochromatic display modules in the driving circuit include a red display module, a green display module, and a blue display module. The red display module, the green display module, and the blue display module are connected to the main control module in a Y-shaped connection manner on the printed circuit board.

[0006] In a third aspect, an embodiment of the present application provides a near-eye display device. The near-eye display device includes a frame assembly and the foregoing driving circuit board. The driving circuit board is installed in the frame assembly.

[0007] In the solution provided by this application, there are multiple monochromatic display modules, and different monochromatic display modules are used to display pictures of different colors; a main control module, the main control module is electrically connected to the multiple display modules, and the main control module is used to input monochromatic picture signals in the image to be displayed to each monochromatic display module; a driving module, the driving module is electrically connected to the main control module, and the main control module is used to input a displacement driving signal to the driving module; multiple pixel displacement modules, the multiple pixel displacement modules are electrically connected to the driving module; wherein, the driving module is used to drive the multiple pixel displacement modules to jitter according to the displacement driving signal, so as to superimpose the monochromatic pictures displayed by each monochromatic display module to improve the display resolution of the image to be displayed, and the multiple pixel displacement modules correspond to the multiple monochromatic display modules one by one. In this way, not only can the display resolution of the image to be displayed be improved based on the XPR technology, but also multiple pixel displacement modules are designed to use the same driving chip, and through the optimized design of the circuit board circuit, the effects of small volume, low cost and light weight can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of this application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0009] Figure 1 FIG. shows a schematic circuit diagram of a driving circuit provided by an embodiment of this application.

[0010] Figure 2 FIG. shows Figure 1 a schematic diagram of the driving module in

[0011] Figure 3 FIG. shows a schematic circuit diagram of a driving circuit provided by another embodiment of this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0012] In order to enable those skilled in the art to better understand the solution of this application, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the drawings in the embodiments of this application. Obviously, the described embodiments are only some embodiments of this application, rather than all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0013] It should be noted that in some processes described in the specification, claims, and the above-mentioned drawings of this application, a plurality of operations that appear in a specific order are included. These operations may not be executed in the order in which they appear in this text or may be executed in parallel. The serial numbers of the operations, such as S110, S120, etc., are only used to distinguish the different operations, and the serial numbers themselves do not represent any execution order. In addition, these processes may include more or fewer operations, and these operations may be executed in sequence or in parallel. Also, the terms "first", "second", etc. in the specification, claims, and the above-mentioned drawings of this application are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of this application described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or server that includes a series of steps or sub-modules does not necessarily have to be limited to those steps or sub-modules clearly listed, but may include other steps or sub-modules that are not clearly listed or are inherent to these processes, methods, products, or devices.

[0014] The inventor proposes a driving circuit, a driving circuit board, and a near-eye display device. The driving circuit, the driving circuit board, and the near-eye display device provided by the embodiments of this application will be described in detail below.

[0015] Please refer to Figure 1 , Figure 1 which is a system schematic diagram of a driving circuit provided by an embodiment of this application. The driving circuit provided by the embodiments of this application will be elaborated in detail below in combination with Figure 1

[0016] In this embodiment, the driving circuit 10 includes a plurality of monochromatic display modules 110, a main control module 120, a driving module 130, and a plurality of pixel displacement modules 140.

[0017] The different monochromatic display modules among the plurality of monochromatic display modules 110 are used to display pictures of different colors. Among them, the plurality of monochromatic display modules 110 may be three-way monochromatic display panels, specifically monochromatic display panels of the three primary colors, that is, the plurality of monochromatic display modules 110 may include a red monochromatic display panel, a green monochromatic display panel, and a blue monochromatic display panel.

[0018] Optionally, the monochrome display module 110 can use a monochrome display panel with the model number JBD013VGA. This MicroLED AM-µLED 0.13 series micro display screen is relatively small, only 0.13 inches. The pixel density is 6350 pixels per inch (PPI), and the resolution is VGA (Video Graphics Array). Its main application field is near-eye information prompt applications. Using this MicroLED micro display panel as the light engine, the monochrome volume can be as small as 0.3 cubic centimeters (CC). The brightness of the single green panel has reached as high as 4.5 million nits, and it is built-in with a random access memory (RAM), which can be understood as a display cache and is responsible for storing and updating the image information on the monochrome display panel.

[0019] The main control module 120 is electrically connected to the multiple display modules. The main control module is used to input the monochrome picture signal in the image to be displayed to each monochrome display module. Among them, the picture to be displayed is the picture that needs to be displayed at the current moment. Through the multiple monochrome display modules 110 corresponding to the three primary colors, that is, through the red monochrome display panel, the green monochrome display panel, and the blue monochrome display panel, the red monochrome picture, the green monochrome picture, and the blue monochrome picture are simultaneously displayed, and then the red monochrome picture, the green monochrome picture, and the blue monochrome picture can form a color picture after prism light combination, that is, form the image picture of the image to be displayed. Optionally, the main control module 120 can be a Field-Programmable Gate Array (FPGA) chip or a System on Chip (SOC).

[0020] The drive module 130 is electrically connected to the main control module. The main control module is used to input a displacement drive signal to the drive module. Among them, the displacement drive signal can be a digital Pulse Width Modulation (PWM) signal. Among them, the basic principle of pulse width modulation is to control the on and off of the inverter circuit switching device, so that a series of pulses with equal amplitudes but inconsistent widths are obtained at the output end, and these pulses are used to replace the sine wave or the required waveform.

[0021] A plurality of pixel displacement modules 140, and the plurality of pixel displacement modules 140 are electrically connected to the driving module 130. Based on this, the driving module 130 is configured to drive the plurality of pixel displacement modules 140 to jitter according to the displacement driving signal, so as to superimpose the monochromatic images displayed by each of the monochromatic display modules 140 to improve the display resolution of the image to be displayed. The plurality of pixel displacement modules 140 correspond to the plurality of monochromatic display modules 110 one by one. Among them, the pixel displacement module 140 is an Expanded Pixel Resolution (XPR) device. An XPR device can be understood as a glass sheet that can generate minute jitters. By controlling the jitter angle of the glass sheet, the image to be displayed refracted through the glass sheet onto the screen can be displaced.

[0022] That is to say, for each monochromatic display module 110, a pixel displacement module 140 is correspondingly configured. Thus, based on the visual persistence phenomenon of the human eye, each pixel displacement module 140 can slightly displace the imaging of the monochromatic image displayed by its corresponding monochromatic display module 110, so that the displayed red monochromatic image, green monochromatic image, and blue monochromatic image are superimposed to form an image to be displayed with doubled resolution. That is to say, the display resolution of the image to be displayed achieved by superimposing and displaying using the plurality of pixel displacement modules 140 is higher than the image resolution of the image to be displayed in the main control module 120.

[0023] In some embodiments, please refer to Figure 2 , the driving module 130 includes a driving chip 131, and the aforementioned displacement driving signal includes a first logic driving signal and a second logic driving signal. The first input terminal 1311, second input terminal 1312, third input terminal 1313, and fourth input terminal 1314 of the driving chip 131 are respectively connected to the first output terminal, second output terminal, third output terminal, and fourth output terminal of the main control module 120. The main control module 120 outputs the first logic driving signal to the driving chip 131 through the first output terminal and the second output terminal, and the main control module 120 outputs the second logic driving signal to the driving chip 131 through the third output terminal and the fourth output terminal.

[0024] Among them, the first input terminal 1311 can be understood as the input channel 1 of the first logic drive signal, and the second input terminal 1312 can be understood as the input channel 2 of the first logic drive signal; the third input terminal 1313 can be understood as the input channel 1 of the second logic drive signal, and the fourth input terminal 1314 can be understood as the input channel 2 of the second logic drive signal. Exemplarily, a low-level signal is input to the first input terminal 1311, and a low-level signal is input to the second input terminal 1312. At this time, the first logic drive signal is "00". Obviously, the first logic drive signal can include four logic signal combinations: "00", "01", "10", and "11". Similarly, the second drive signal can also include four logic signal combinations: "00", "01", "10", and "11".

[0025] The driving chip 131 can turn on or off the corresponding field effect transistor (FET) through its own logic control conversion circuit, so that four output effects, that is, four control signals, can be generated at the first output terminal 1315 and the second output terminal 1316 of the driving chip 131. These four control signals correspond one-to-one to the four first logic drive signals mentioned above. Similarly, the driving chip 131 can also turn on or off the corresponding FET through its own logic control conversion circuit, so that four output effects, that is, four control signals, can be generated at the third output terminal 1317 and the fourth output terminal 1318 of the driving chip 131. These four control signals correspond one-to-one to the four second logic drive signals mentioned above. The first output terminal 1315 and the second output terminal 1316 of the driving chip 131 are used to output the control signals corresponding to the first logic drive signal to the pixel displacement module 140 corresponding to each monochromatic display module 110, and the third output terminal 1317 and the fourth output terminal 1318 of the driving chip 131 are used to output the control signals corresponding to the second logic drive signal to the pixel displacement module 140 corresponding to each monochromatic display module 110.

[0026] Exemplarily, if the first logic drive signal "10" is input to the first input terminal 1311 and the second input terminal 1312, and the first logic drive signal "10" is input to the third input terminal 1313 and the fourth input terminal 1314, then the output current of the drive chip 131 is positive; conversely, if the first logic drive signal "01" is input to the first input terminal 1311 and the second input terminal 1312, and the first logic drive signal "01" is input to the third input terminal 1313 and the fourth input terminal 1314, then the output current of the drive chip 131 will be reversed to negative. Thus, by reasonably controlling the waveforms of the two groups of PWM signals input to the first input terminal 1311, the second input terminal 1312, the third input terminal 1313, and the fourth input terminal 1314, the magnitude and direction of the output current can be changed, enabling the XPR device (i.e., multiple pixel displacement modules 140) to resonate at a certain frequency to achieve the pixel displacement purpose.

[0027] Optionally, please refer to Figure 2 , the drive module 130 further includes a first zero-ohm resistor 132 and a second zero-ohm resistor 133. The fifth output terminal of the drive chip 131 is grounded through the first zero-ohm resistor 132, and the sixth output terminal of the drive chip 131 is grounded through the second zero-ohm resistor 133. Since the 0-ohm resistor is actually a milliohm-level resistor, such a combination with PCB traces helps to limit abnormal large currents. Among them, the first zero-ohm resistor 132 and the second zero-ohm resistor 133 are generally preferably zero-ohm resistors with a 0603 package specification.

[0028] Optionally, please refer to Figure 2 and Figure 3 , the drive module 130 further includes a capacitor 134, and the drive circuit further includes a power supply module 150. Among them, the power supply module 150 includes, but is not limited to, a conventional DC-to-DC converter (DCDC) or a low-dropout regulator (LDO). The power input terminal of the drive chip 131 is electrically connected to the power supply module 150, and the power input terminal is grounded through the capacitor 134 to achieve the functions of filtering noise and stabilizing the power supply voltage. Moreover, the main control module 120 is also electrically connected to the power supply module 150. That is to say, the power supply module 150 can supply power to the drive module 130 and the main control module 120.

[0029] Moreover, when the enable signal at the enable port 1319 of the driving chip 131 is a low-level signal, the driving chip 131 stops working; when the enable signal at the enable port 1319 of the driving chip 131 is a high-level signal, the driving chip 131 works normally. It should be noted that a comparator (not shown in the drawings) is included inside the driving chip 131. The enable port 1319 of the driving chip 131 generates a low-level signal when the external voltage is greater than the set voltage of the comparator, playing a role in protecting the driving chip 131. The enable port of the driving chip 131 generates a high-level signal when the external voltage is less than or equal to the set voltage of the comparator.

[0030] In some embodiments, the foregoing driving circuit 10 may be disposed on a printed circuit board to obtain a driving circuit board. The multiple monochromatic display modules 110 in the driving circuit 10 include a red display module, a green display module, and a blue display module. The red display module, the green display module, and the blue display module are connected to the main control module in a Y-shaped connection manner on the printed circuit board.

[0031] In this way, the foregoing driving circuit board may be disposed inside the frame assembly of the near-eye display device. Optionally, the near-eye display device may be an AR near-eye display device.

[0032] In this embodiment, a miniaturized FPGA chip may be used as the main control to output the XPR and the timing of the three-channel screen signals. Since the AR driving board circuit and the driving current of the three-channel XPR are relatively small, a zero-ohm resistor combined with the printed circuit board trace design at the current-limiting resistor of the driving chip can achieve a resistance value in the milliohm level to meet the requirements of the driving circuit, which can reduce the types of materials and save the cost of the special resistance value bill of materials at the same time. The three-channel XPR parallel design shares a dual-channel output driving chip, which can continue to save costs; at the same time, the Y-shaped connection method can be adopted at the printed circuit board end, that is, the three monochromatic panels can share a driving circuit, achieving a reduction in the overall circuit board layout volume. This helps the control board design of the miniaturized full-color AR near-eye display device and reduces the overall design cost at the same time.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A driving circuit, characterized in that, The driving circuit includes: Multiple monochromatic display modules, where different monochromatic display modules are used to display pictures of different colors; A main control module, the main control module is electrically connected to the multiple monochromatic display modules, and the main control module is used to input the monochromatic picture signal in the image to be displayed to each monochromatic display module; A driving module, the driving module is electrically connected to the main control module, and the main control module is used to input a displacement driving signal to the driving module; Multiple pixel displacement modules, the multiple pixel displacement modules are electrically connected to the driving module; Wherein, the driving module is used to drive the multiple pixel displacement modules to jitter according to the displacement driving signal, so as to superimpose the monochromatic pictures displayed by each monochromatic display module to improve the display resolution of the image to be displayed, and the multiple pixel displacement modules correspond one-to-one with the multiple monochromatic display modules.

2. The drive circuit according to claim 1, wherein The driving module includes a driving chip, and the displacement driving signal includes a first logic driving signal and a second logic driving signal; The first input terminal, the second input terminal, the third input terminal and the fourth input terminal of the driving chip are respectively connected to the first output terminal, the second output terminal, the third output terminal and the fourth output terminal of the main control module. The main control module outputs the first logic driving signal to the driving chip through the first output terminal and the second output terminal, and the main control module outputs the second logic driving signal to the driving chip through the third output terminal and the fourth output terminal; The first output terminal and the second output terminal of the driving chip are used to output the control signal corresponding to the first logic driving signal to the pixel displacement module corresponding to each monochromatic display module, and the third output terminal and the fourth output terminal of the driving chip are used to output the control signal corresponding to the second logic driving signal to the pixel displacement module corresponding to each monochromatic display module.

3. The drive circuit according to claim 2, characterized in that, The driving module further includes a first zero-ohm resistor and a second zero-ohm resistor; The fifth output terminal of the driving chip is grounded through the first zero-ohm resistor, and the sixth output terminal of the driving chip is grounded through the second zero-ohm resistor.

4. The drive circuit according to claim 3, wherein, The first zero-ohm resistor and the second zero-ohm resistor are zero-ohm resistors with a 0603 package specification.

5. The drive circuit according to claim 2, wherein, The driving module further includes a capacitor, and the driving circuit further includes a power supply module; The power input terminal of the driving chip is electrically connected to the power supply module, and the power input terminal is grounded through the capacitor.

6. The drive circuit according to claim 2, characterized in that, When the enable signal at the enable port of the driving chip is a low-level signal, the driving chip stops working; When the enable signal at the enable port of the driving chip is a high-level signal, the driving chip works normally.

7. The drive circuit according to claim 6, wherein The driving chip includes a comparator. The enable port of the driving chip generates a low-level signal when the external voltage is greater than the set voltage of the comparator, and the enable port of the driving chip generates a high-level signal when the external voltage is less than or equal to the set voltage of the comparator.

8. The drive circuit according to claim 2, wherein The driving chip is a field programmable gate array FPGA or a system on chip SOC.

9. A driving circuit board, characterized in that, The driving circuit board includes a printed circuit board and the driving circuit according to any one of claims 1-8. The driving circuit is disposed on the printed circuit board. The plurality of monochromatic display modules in the driving circuit include a red display module, a green display module, and a blue display module. The red display module, the green display module, and the blue display module are connected to the main control module in a Y-shaped connection manner on the printed circuit board.

10. A near-eye display device, characterized in that, The near-eye display device includes a frame assembly and the driving circuit board according to claim 9. The driving circuit board is installed in the frame assembly.

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