WO2020228707A1

WO2020228707A1 - Method for eliminating ghost images, apparatus, and storage medium

Info

Publication number: WO2020228707A1
Application number: PCT/CN2020/089875
Authority: WO
Inventors: 陈昆; 蒋厚强; 陈军
Original assignee: 华为技术有限公司
Priority date: 2019-05-15
Filing date: 2020-05-12
Publication date: 2020-11-19
Also published as: CN111951741B; CN111951741A

Abstract

A method for eliminating ghost images, an apparatus, and a storage medium, which are applied to optical communication products or components comprising an LCOS panel, and which are used to eliminate ghost images generated by a display screen of an LCOS panel that is fixed for a long period of time. The method comprises: detecting that an LCOS panel is in a display state (S401); and dynamically changing the driving voltage of the LCOS panel so as to dynamically adjust a screen corresponding to the LCOS panel (S402), the screen after dynamic adjustment and the screen prior to dynamic adjustment having the same display effect. The described method may eliminate the phenomenon of ghost images when products using LCOS technology operate for long periods.

Description

Method, device and storage medium for eliminating residual image

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is 2019104028920, and the application name is "Method, Device and Storage Medium for Eliminating Image Remaining" on May 15, 2019, the entire content of which is incorporated by reference In this application.

Technical field

This application relates to optical communication technology, and in particular to a method, device and storage medium for eliminating image retention.

Background technique

With the continuous development of optical communication technology, liquid crystal on silicon (LCOS) technology has emerged. Among them, LCOS technology, also known as silicon crystal technology, liquid crystal on silicon technology, etc., is a technology that combines semiconductor technology and liquid crystal display (LCD). Because LCOS technology has the advantages of high resolution, low price, and more energy saving and environmental protection at the same time, LCOS technology shows strong development potential in the field of display technology. However, LCOS technology still has a defect that cannot be ignored: when products using LCOS technology, such as wavelength selective switch (wavelength selective switch, WSS), work in one state for a long time, that is, the same wavelength remains in a certain direction for a long time. At this time, the driving voltage of the liquid crystal alignment layer maintains a state for a long time. At this time, due to the characteristics of the liquid crystal molecules in the liquid crystal alignment layer, the product will have a problem of image retention when switching screens.

In order to achieve the purpose of eliminating the residual image, the prior art generates a control signal after detecting that the display device is shut down. The control signal is used to control the gate driving unit of the display device so that the gate driving unit outputs a low level. It is a preset level, where the preset level is used to turn on the active switch of the display device, thereby accelerating the discharge of the liquid crystal capacitor and the energy storage capacitor of the display device, and eliminating the phenomenon of after-image after shutdown.

But for the application of LCOS technology, the influence of the afterimage is the influence of the online status of the product. Therefore, the above solution to eliminate the phenomenon of shutdown afterimage is not applicable to products using LCOS technology.

Summary of the invention

This application provides a method, device and storage medium for eliminating image retention, so as to eliminate the phenomenon of image retention during long-term operation of products using LCOS technology.

In order to achieve the above objectives, this application provides the following technical solutions:

In the first aspect, this application provides a method for eliminating image retention, which is applied to optical communication products or components including LCOS panels to eliminate image retention caused by long-term fixation of the display screen of the LCOS panel. The method includes: detecting that the LCOS panel is in a display state; dynamically changing the driving voltage of the LCOS panel to dynamically adjust the picture corresponding to the LCOS panel, and the dynamically adjusted picture has the same display effect as the picture before the dynamic adjustment.

By dynamically changing the driving voltage of the LCOS panel, the corresponding picture of the LCOS panel is dynamically adjusted, and the dynamic LCOS picture is used instead of the static LCOS picture to eliminate the aggregation of liquid crystal molecules in the liquid crystal alignment layer without affecting or slightly affecting the product function or performance. Problem, avoid the afterimage phenomenon of the product during long-term work, and achieve the purpose of extending the working life of the product.

In a possible implementation manner, dynamically changing the driving voltage of the LCOS panel as described above may include: changing the driving voltage of M pixel points on the LCOS panel. Among them, the LCOS panel includes N pixels, M and N are both positive integers, and N is greater than M.

By changing the driving voltage of a single or a small number of pixels on the LCOS panel, the problem of the aggregation of liquid crystal molecules in the liquid crystal alignment layer is eliminated, and the phenomenon of image retention during long-term operation of the product is avoided.

In a possible implementation manner, changing the driving voltage of the M pixel points on the LCOS panel as described above may include: in the i-th cycle, changing the (i-1)*Mth to the i*M-th on the LCOS panel The driving voltage of one pixel is changed from the first voltage to the second voltage. Wherein, in the i+1th cycle, the driving voltage of the M pixel points corresponding to the i-th cycle is changed from the second voltage to the third voltage.

Optionally, the third voltage is equal to the first voltage to minimize the impact on the product function or performance.

In a possible implementation manner, dynamically changing the driving voltage of the LCOS panel as described above may include: determining a free area on the LCOS panel, the free area does not contain a picture; applying the driving voltage of the corresponding area of the picture to the free area, and Release the driving voltage of the corresponding area.

By moving the picture to a free area on the LCOS panel, the problem of the aggregation of liquid crystal molecules in the liquid crystal alignment layer is eliminated, and the phenomenon of image retention during long-term operation of the product is avoided.

Optionally, the size of the free area includes at least a size corresponding to one channel. In some embodiments, the size of the free area includes the size corresponding to one channel, and the free area is the free channel; in other embodiments, the size of the free area includes the size of the entire screen, which corresponds to multiple channels.

In a possible implementation manner, dynamically changing the applied voltage of the LCOS panel as described above may include: determining the driving voltage of the channel corresponding to the screen, and the screen corresponds to at least two channels; according to the arrangement order of each channel, periodically The drive voltage of a channel is adjusted to the drive voltage of the previous channel, or the drive voltage of one channel is adjusted to the drive voltage of the next channel. Wherein, the channel includes a plurality of pixels, and the driving voltages corresponding to different pixels are the same or different.

In this implementation mode, the grating is shifted while maintaining the grating period to eliminate the problem of the aggregation of liquid crystal molecules in the liquid crystal alignment layer and avoid the phenomenon of image retention during long-term operation of the product.

In the second aspect, the present application provides a device for eliminating image retention, which is used to eliminate the image retention caused by the long-term fixation of the display screen of the LCOS panel. The device includes: input interface and control circuit; among them,

Input interface, used to get the LCOS panel in the display state,

The control circuit is used to dynamically change the driving voltage of the LCOS panel to dynamically adjust the picture corresponding to the LCOS panel. The picture after the dynamic adjustment has the same display effect as the picture before the dynamic adjustment.

In a possible implementation manner, the above-mentioned control circuit may be specifically used to change the driving voltage of M pixel points on the LCOS panel. The LCOS panel includes N pixels, where M and N are both positive integers, and N is greater than M.

In a possible implementation manner, the above-mentioned control circuit can be further used for: in the i-th cycle, the driving voltage of the (i-1)*M to i*M-1 pixel points on the LCOS panel is changed from The first voltage is changed to the second voltage. Wherein, in the i+1th cycle, the driving voltage of the M pixel points corresponding to the i-th cycle is changed from the second voltage to the third voltage.

In a possible implementation manner, the above-mentioned control circuit can be specifically used to: determine the free area on the LCOS panel, the free area does not contain the picture; apply the driving voltage of the corresponding area of the picture to the free area, and release the corresponding area Drive voltage.

In a possible implementation manner, the above-mentioned control circuit may be specifically used to: determine the driving voltage of the channel corresponding to the screen, and the screen corresponds to at least two channels; according to the arrangement order of each channel, periodically change the driving voltage of one channel Adjust the drive voltage of the previous channel, or adjust the drive voltage of one channel to the drive voltage of the next channel. Wherein, the channel includes a plurality of pixels, and the driving voltages corresponding to different pixels are the same or different.

In a third aspect, the present application provides a device for eliminating image retention, including a memory and a processor.

Among them, a computer program executable by the processor is stored in the memory.

When the processor reads and executes the computer program, the processor is caused to execute the method according to any one of the first aspects.

In a fourth aspect, the present application provides a computer-readable storage medium that stores a computer program. The computer program includes at least one piece of code, and at least one piece of code can be executed by a processor to implement any one of the first aspect The method described.

In a fifth aspect, the present application provides a chip with a computer program stored on the chip, and when the computer program is executed by a processor, the method described in the present application in the first aspect is executed.

These and other aspects of the application will be more concise and understandable in the description of the following embodiment(s).

Description of the drawings

Figure 1 is a schematic diagram of LCD display principle;

Figure 2 is an example diagram of the wavelength direction of a WSS including an LCOS panel;

Figure 3 is an example diagram of an application scenario provided by this application;

FIG. 4 is a schematic flowchart of a method for eliminating image retention according to an embodiment of the application;

FIG. 5 is a diagram of an application example of a method for eliminating image retention provided by an embodiment of the application;

6 is a diagram of an application example of a method for eliminating image retention provided by another embodiment of the application;

FIG. 7 is a diagram of an application example of a method for eliminating image retention provided by another embodiment of the application;

FIG. 8 is an application example diagram of a method for eliminating image retention provided by another embodiment of the application;

9 is a diagram of an application example of a method for eliminating image retention provided by another embodiment of the application;

10 is a schematic structural diagram of a device for eliminating image retention provided by an embodiment of the application;

FIG. 11 is a schematic structural diagram of a device for eliminating image retention provided by another embodiment of the application.

Detailed ways

First, explain some terms involved in this application.

According to the principle of LCD display, LCD is a passive display that does not emit light, and mainly relies on light emitting diodes (LEDs) behind the screen to emit light. As shown in Figure 1, LCD uses the twisting-nematic effect of liquid crystal molecules to change the light transmittance of the LED by controlling the driving voltage to deflect the liquid crystal molecules between the two liquid crystal alignment layers, so that the brightness and contrast of the LCD are changed. Variety. When the driving voltage is removed, the liquid crystal molecules resume their twisted structure. Place such a liquid crystal alignment layer between two polarizers and change the relative position of the polarization to obtain the display form of the picture.

When the liquid crystal cell contains ions and a screen is displayed for a long time, the free ions will move to the upper and lower electrodes of the liquid crystal cell along the direction of the liquid crystal pretilt angle, and gather on the surface of the liquid crystal alignment layer. When driving the voltage, the liquid crystal will produce a planned phenomenon, so that the driving voltage has no effect on the liquid crystal molecules.

At this time, if the screen is switched, the aggregated liquid crystal molecules cannot leave the surface of the liquid crystal alignment layer immediately, and it will continue to be observed that the transmittance of the gathering place is different from that of other places, which is the afterimage. Therefore, the longer the screen stays and the higher the temperature, the more likely it is to produce afterimages.

Image retention refers to the phenomenon that the picture does not disappear immediately before the switch, but the visual effect (or optical effect) appears at the same time as the picture after the switch, and then the picture slowly disappears or never disappears before the switch.

Optical communication products or components containing LCOS panels have the same principles as LCD display. The liquid crystal alignment layer of the LCOS panels adjusts the diffraction angle of each wavelength through a driving voltage bias. When the driving voltage of the liquid crystal alignment layer maintains a state for a long time, that is, when the same wavelength is adjusted to a certain direction for a long time, due to the characteristics of the liquid crystal molecules, an afterimage phenomenon may occur when the LCOS panel switches images. This afterimage phenomenon can cause wavelength switching abnormalities, for example, the wavelength cannot be switched normally or the insertion loss is abnormal, which leads to failures of optical communication products or components, and ultimately to business abnormalities.

Among them, optical communication products or components that include LCOS panels have a greater probability of long-term scheduling of certain wavelengths in the same direction. For example, as shown in Figure 2, when a WSS including an LCOS panel runs for several days, the wavelength λ1 is scheduled to direction 1, the wavelength λ2 is scheduled to direction 2,..., the wavelength λ96 is scheduled to direction 3, and then the wavelength λ1 needs When switching from direction 1 to direction 4, due to the afterimage phenomenon, the wavelength λ1 cannot be switched in time, and part of the light spot of wavelength λ1 still stays in direction 1. Assuming the stay time is longer than 3 seconds (s), the service in direction 4 is affected , At the same time, it affects other businesses in direction 1.

In response to the above problems, the present application provides a method, device and storage medium for eliminating image retention, and provides solutions for preventing image retention in products using LCOS technology, such as optical wavelength selective switch components or optical wavelength switching components. Specifically, by dynamically adjusting the screen corresponding to LCOS, that is, dynamic LCOS screen instead of static LCOS screen, in the case of not affecting the function or performance of the product as much as possible, the phenomenon of image retention during long-term operation of the product is eliminated, so as to extend the working life of the product. purpose.

Figure 3 is an example diagram of an application scenario provided by this application. Referring to Fig. 3, the optical signal propagating through the optical fiber passes through the microelectromechanical system (MEMS) and spherical mirror, and then propagates to the LCOS panel, and then realizes the grating function through the LCOS panel, and realizes the light by changing the grating angle. Signal wavelength selection and exchange function.

Specifically, MEMS includes mirrors and gratings. The number of mirrors is the same as the number of optical fibers. The optical signal transmitted by each optical fiber is reflected by the corresponding mirror of the optical fiber and then propagated to the grating. The optical signal is transmitted by the grating. Dispersion, the light beams of each wavelength contained in the optical signal are obtained. For example, the optical signal contains light beams of 96 wavelengths. After the optical signal passes through the grating, 96 light beams with different wavelengths are obtained. The spherical mirror is also a mirror, used to increase the propagation distance of the optical signal. The light beams of each wavelength after being broken up by the grating propagate to the LCOS panel after being reflected by the spherical mirror. The LCOS panel selects or exchanges light beams of 96 wavelengths to obtain the required target optical signal, which is output to the optical fiber through the spherical mirror and MEMS in the reverse direction.

FIG. 4 is a schematic flowchart of a method for eliminating image retention according to an embodiment of the application. The method is applied to optical communication products or components containing LCOS panels, and is used to eliminate the residual image caused by the long-term fixation of the display screen of the LCOS panel.

As shown in Fig. 4, the method for eliminating the afterimage includes the following steps:

S401: It is detected that the LCOS panel is in a display state.

S402: Dynamically change the driving voltage of the LCOS panel to dynamically adjust the image corresponding to the LCOS panel.

Among them, the picture after dynamic adjustment has the same display effect as the picture before dynamic adjustment.

In practical applications, it is distinguished according to the usage of the LCOS panel, and the state of the LCOS panel can include the display state and the closed state. Among them, the LCOS panel in the display state corresponds to a screen.

As mentioned above, if an LCOS panel with a certain screen is displayed for a long time, that is to say, the driving voltage of the LCOS panel does not change for a long time, the afterimage phenomenon is prone to occur when the screen is switched. At this time, in order to avoid this problem, the screen that should be fixed for a long time, that is, the static LCOS screen, is adjusted to the dynamic LCOS screen through S402, and the display effect of the dynamic LCOS screen and the static LCOS screen is the same or similar.

Specifically, the driving voltage control of the LCOS panel is described as follows:

The control circuit receives the image display instruction, and the liquid crystal display module is used to decompose the received image signal into dot signals, that is, independent pixel signals; then, the control circuit encodes the dot signals, where the dot signals are encoded and the results are respectively Corresponding to the pixel points in the LCOS panel, the coded point signal is transmitted to the intersection of the row and column in the LCOS panel through the row electrode and column electrode, thereby controlling the driving voltage of each pixel, and controlling each pixel by controlling the driving voltage. The diffraction state of the pixel. Among them, the liquid crystal display module includes row electrodes and column electrodes.

In this application, by dynamically changing the driving voltage of the LCOS panel to dynamically adjust the screen corresponding to the LCOS panel, the dynamic LCOS screen is used instead of the static LCOS screen to eliminate the liquid crystal in the liquid crystal alignment layer without affecting or slightly affecting the product function or performance. The problem of molecular aggregation can avoid the afterimage phenomenon of the product during long-term work, and achieve the purpose of extending the working life of the product.

On the basis of the foregoing embodiment, S402, dynamically changing the driving voltage of the LCOS panel to dynamically adjust the screen corresponding to the LCOS panel, can be implemented in a variety of ways, and the following examples are described.

In an implementation manner, dynamically changing the driving voltage of the LCOS panel may include: changing the driving voltage of M pixel points on the LCOS panel. Among them, the LCOS panel includes N pixels, M and N are both positive integers, and N is greater than M. Those skilled in the art can understand that N is much greater than M. In this way, by changing the driving voltage of a single or a small number of pixels on the LCOS panel, the problem of aggregation of liquid crystal molecules in the liquid crystal alignment layer is eliminated, and the phenomenon of image retention during long-term operation of the product .

Optionally, changing the driving voltage of the M pixel points on the LCOS panel can be specifically: in the i-th cycle, driving the (i-1)*M to i*M-1 pixel points on the LCOS panel The voltage is changed from the first voltage to the second voltage. Wherein, in the i+1th cycle, the driving voltage of the M pixel points corresponding to the i-th cycle is changed from the second voltage to the third voltage. Optionally, the third voltage is equal to the first voltage to minimize the impact on the product function or performance.

For example, referring to Figure 5, there are about 1920*1080*2 pixels on the LCOS panel of an 8*24 add/drop wavelength selective switch (ADWSS) device, corresponding to 8 channels, each channel corresponding to 96 wavelengths, each The pixel point of the channel is about 5000. When this device is working, 5000 pixels of a channel are blue screens, with a period of 3 seconds. Each period turns the driving voltage of the 3 pixels from the first The voltage is changed to the second voltage. Illustratively, the color of the 3 pixels is changed from blue to white. After 3 seconds, the driving voltage of the 3 pixels is changed from the second voltage to The first voltage appears visually as these 3 pixels return to blue; the next cycle changes the colors of the other 3 pixels. It takes about 83 minutes to complete the change of all pixels on the LCOS panel to avoid the afterimage phenomenon. Since the number of pixels changed each time is 3, which is less than the total number of pixels on the LCOS panel, the impact on the insertion loss is less than 0.1%.

It should be noted that for different channels, the first voltage corresponding to the pixel point may be different; the same applies, the second voltage corresponding to the pixel point may also be the same or different, and/or where the pixel point corresponds to The third voltage can also be the same or different.

This implementation mode changes the driving voltage of a small number of pixels in the LCOS panel through the modification of the software or the driver program, eliminates the problem of the aggregation of liquid crystal molecules in the liquid crystal alignment layer, and has low cost and simple implementation.

In another implementation manner, dynamically changing the driving voltage of the LCOS panel may include: determining a free area on the LCOS panel, the free area does not contain a picture; applying the driving voltage of the corresponding area of the picture to the free area, and releasing the picture The driving voltage of the corresponding area. This implementation method eliminates the problem of the aggregation of liquid crystal molecules in the liquid crystal alignment layer by moving the picture to a free area on the LCOS panel, and avoids the phenomenon of image retention during long-term operation of the product.

This implementation requires the use of free areas on the LCOS panel. Wherein, the size of the free area includes at least a size corresponding to one channel. Normally, the screen does not occupy all channels; or, if the screen occupies all channels, you can increase the area of the LCOS panel to increase the idle channels.

Therefore, in some embodiments, the size of the free area includes the size corresponding to one channel, and the free area is the free channel. Through the switching function in the optical path system of the optical communication product or component, the driving voltage of the corresponding channel of the screen is applied to the idle channel, and the driving voltage of the corresponding area of the screen is released, thereby switching the screen of the corresponding channel to the idle channel to achieve The purpose of preventing the afterimage phenomenon.

Exemplarily, as shown in Figure 6, there are a total of 8 channels on the LCOS panel of an 8*24 ADWSS device, and the pixel points of each channel are about 5000. When this device is working, the 5000 pixels of a certain channel appear It is a blue screen. When it is determined that a channel on the LCOS panel is an idle channel, the driving voltage of the channel that appears as a blue screen can be switched to the LCOS area of the idle channel. After the switch is completed, the blue screen before the release The drive voltage of the channel, the channel becomes an idle channel.

In other embodiments, the size of the free area includes the size of the entire screen, and the entire screen corresponds to multiple channels. At this time, the position of the entire screen can be shifted by controlling the position of the overall light irradiated on the LCOS panel. As shown in Figure 7, before dynamic adjustment, the screen is in the upper left corner of the LCOS panel; after dynamic adjustment, the screen is in the lower right corner of the LCOS panel.

In yet another implementation manner, dynamically changing the driving voltage of the LCOS panel may include: determining the driving voltage of the channel corresponding to the screen, the screen corresponding to at least two channels; according to the order of the channels, periodically driving one channel The voltage is adjusted to the driving voltage of the previous channel, or the driving voltage of one channel is adjusted to the driving voltage of the subsequent channel. Wherein, the channel includes multiple pixels, and the driving voltages corresponding to different pixels may be the same or different. In this implementation mode, the grating is shifted while maintaining the grating period to eliminate the problem of the aggregation of liquid crystal molecules in the liquid crystal alignment layer and avoid the phenomenon of image retention during long-term operation of the product.

When the LCOS panel is working, the image of each channel is a blazed grating image with a fixed period to deflect the light. According to the grating equation, the deflection angle of the light is strongly related to the period of the grating, but has nothing to do with the initial point of the period of the grating. . Therefore, as shown in Figure 8, the grating can be shifted while maintaining the grating period without affecting the operation of the LCOS panel, and the shifting time can be defined according to actual requirements. Since the driving voltage of the grating is in the range of 0-15V, the driving voltage of the pixels on the LCOS panel is periodically switched between 0-15V during the translation process. There will be no pixel staying at the high voltage of 15V for a long time. To achieve the purpose of avoiding the afterimage phenomenon.

As shown in Figure 9, there are a total of 8 channels on the LCOS panel of an 8*24 ADWSS device, and the pixels of each channel are about 5000. When this device is working, the 8 channels are presented in sequence: red picture, orange Picture, yellow picture, green picture, cyan picture, blue picture, purple picture, brown picture. After dynamic adjustment, the 8 channels are presented in sequence: brown picture, red picture, orange picture, yellow picture, green picture, cyan picture, blue picture, and purple picture.

FIG. 10 is a schematic structural diagram of a device for eliminating image retention provided by an embodiment of the application. The device for eliminating the afterimage may be an optical communication product or component including an LCOS panel, or a chip of an optical communication product or component including an LCOS panel, which is used to eliminate the afterimage caused by the long-term fixation of the display screen of the LCOS panel.

As shown in FIG. 10, the device 10 for eliminating residual image in this embodiment includes: an input interface 11 and a control circuit 12. among them:

The input interface 11 is used to obtain the display state of the LCOS panel.

The control circuit 12 is used for dynamically changing the driving voltage of the LCOS panel to dynamically adjust the image corresponding to the LCOS panel. The picture after dynamic adjustment has the same display effect as the picture before dynamic adjustment.

Exemplarily, the device 10 for eliminating residual image may specifically exist in the form of a single-chip microcomputer or a field-programmable gate array (FPGA).

As an optional solution, the control circuit 12 can be specifically used to: change the driving voltage of the M pixel points on the LCOS panel. The LCOS panel includes N pixels, where M and N are both positive integers, and N is greater than M.

Those skilled in the art can understand that N is much larger than M. In this way, by changing the driving voltage of a single or a small number of pixels on the LCOS panel, the problem of aggregation of liquid crystal molecules in the liquid crystal alignment layer is eliminated, and the phenomenon of image retention during long-term operation of the product is avoided. .

Further, the control circuit 12 can be specifically used to: in the i-th cycle, change the driving voltage of the (i-1)*M to i*M-1th pixel points on the LCOS panel from the first voltage to the second Voltage. Wherein, in the i+1th cycle, the driving voltage of the M pixel points corresponding to the i-th cycle is changed from the second voltage to the third voltage.

As an optional solution, the control circuit 12 can be specifically used to: determine the idle area on the LCOS panel, the idle area does not contain a picture; apply the driving voltage of the corresponding area of the picture to the idle area, and release the driving voltage of the corresponding area. This optional solution eliminates the problem of the aggregation of liquid crystal molecules in the liquid crystal alignment layer by moving the picture to a free area on the LCOS panel, and avoids the phenomenon of image retention during long-term operation of the product.

As an optional solution, the control circuit 12 may be specifically configured to: determine the driving voltage of the channel corresponding to the picture, the picture corresponds to at least two channels; according to the arrangement order of the channels, periodically adjust the driving voltage of one channel to The driving voltage of the previous channel, or adjusting the driving voltage of one channel to the driving voltage of the following channel. Wherein, the channel includes a plurality of pixels, and the driving voltages corresponding to different pixels are the same or different.

In this optional solution, the grating is shifted while maintaining the grating period to eliminate the problem of the aggregation of liquid crystal molecules in the liquid crystal alignment layer and avoid the phenomenon of image retention during long-term operation of the product.

The device for eliminating image retention described above in this embodiment can be used to implement the technical solutions in the above corresponding method embodiments, and its implementation principles and technical effects are similar.

In some embodiments, in terms of hardware implementation, the aforementioned input interface 11 and control circuit 12 may be embedded in the processor in the form of hardware. Alternatively, in terms of hardware implementation, the aforementioned control circuit 12 may be a processor, and the aforementioned input interface 11 may be a receiver.

Correspondingly, as shown in FIG. 11, the device 20 for eliminating afterimages in this embodiment may include a memory 21 and a processor 22. The memory 21 is used to store a computer program that can be executed by the processor 22. When the processor 22 reads and executes the computer program, the processor 22 is caused to execute the method as described above.

The computer program can be implemented in the form of a software functional unit and can be sold or used as an independent product, and the memory can be any form of computer readable storage medium. Based on this understanding, all or part of the technical solution of the present application can be embodied in the form of a software product, including several instructions to enable a computer device, specifically a processor, to execute the first in each embodiment of the present application. All or part of the steps of the terminal device. The aforementioned computer-readable storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disks or optical disks and other various programs that can store programs The medium of the code.

It should be noted that the division of modules in this application is illustrative and only a logical function division, and there may be other division methods in actual implementation. The functional modules in the embodiments of the present application may be integrated into one processing module, or each module may exist alone physically, or two or more modules may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware or software functional modules.

If the integrated module is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solution of this application essentially or the part that contributes to the existing technology or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , Including a number of instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage media include: U disk, mobile hard disk, ROM, RAM, magnetic disk or optical disk and other media that can store program codes.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, all or part of the processes or functions described in this application are generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center. Transmission to another website site, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center integrated with one or more available media. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A method for eliminating image retention, characterized in that it is applied to an optical communication product or component including a liquid crystal on silicon LCOS panel to eliminate the image retention caused by the long-term fixation of the display screen of the LCOS panel. The method includes :

It is detected that the LCOS panel is in a display state;

The driving voltage of the LCOS panel is dynamically changed to dynamically adjust the picture corresponding to the LCOS panel, and the picture after the dynamic adjustment has the same display effect as the picture before the dynamic adjustment.
The method of claim 1, wherein the dynamically changing the driving voltage of the LCOS panel comprises:

Changing the driving voltage of the M pixels on the LCOS panel, the LCOS panel includes N pixels, where M and N are both positive integers, and N is greater than M.
The method according to claim 2, wherein the changing the driving voltage of the M pixel points on the LCOS panel comprises:

In the i-th period, the driving voltage of the (i-1)*M to i*M-1th pixel points on the LCOS panel is changed from the first voltage to the second voltage, where in the i+1th The driving voltage of the M pixel points corresponding to the i-th period is changed from the second voltage to a third voltage.
The method of claim 3, wherein the third voltage is equal to the first voltage.
The method of claim 1, wherein the dynamically changing the driving voltage of the LCOS panel comprises:

Determine a free area on the LCOS panel, where the free area does not include the picture;

Applying the driving voltage of the corresponding area of the screen to the idle area;

Release the driving voltage of the corresponding area.
The method according to claim 5, wherein the size of the free area at least includes a size corresponding to one channel.
The method of claim 1, wherein the dynamically changing the applied voltage of the LCOS panel comprises:

Determining the driving voltage of the channel corresponding to the picture, the picture corresponding to at least two channels;

According to the arrangement sequence of the channels, periodically adjusting the driving voltage of one channel to the driving voltage of the previous channel, or adjusting the driving voltage of one channel to the driving voltage of the next channel;

Wherein, the channel includes a plurality of pixels, and the driving voltages corresponding to different pixels are the same or different.
A device for eliminating image retention, characterized in that it is used to eliminate image retention caused by a long-term fixation of the display screen of a liquid crystal on silicon LCOS panel. The device includes: an input interface and a control circuit; wherein,

The input interface is used to obtain that the LCOS panel is in a display state,

The control circuit is used to dynamically change the driving voltage of the LCOS panel to dynamically adjust the picture corresponding to the LCOS panel, and the picture after the dynamic adjustment has the same display effect as the picture before the dynamic adjustment.
The device according to claim 8, wherein the control circuit is specifically configured to:

Changing the driving voltage of the M pixels on the LCOS panel, the LCOS panel includes N pixels, where M and N are both positive integers, and N is greater than M.
The device according to claim 9, wherein the control circuit is specifically configured to:

In the i-th period, the driving voltage of the (i-1)*M to i*M-1th pixel points on the LCOS panel is changed from the first voltage to the second voltage, where in the i+1th The driving voltage of the M pixel points corresponding to the i-th period is changed from the second voltage to a third voltage.
The device of claim 10, wherein the third voltage is equal to the first voltage.
The device according to claim 8, wherein the control circuit is specifically configured to:

Determine a free area on the LCOS panel, where the free area does not include the picture;

Applying the driving voltage of the corresponding area of the screen to the idle area;

Release the driving voltage of the corresponding area.
The device according to claim 12, wherein the size of the free area includes at least a size corresponding to a channel.
The device according to claim 8, wherein the control circuit is specifically configured to:

Determining the driving voltage of the channel corresponding to the picture, the picture corresponding to at least two channels;

According to the arrangement sequence of the channels, periodically adjusting the driving voltage of one channel to the driving voltage of the previous channel, or adjusting the driving voltage of one channel to the driving voltage of the next channel;

Wherein, the channel includes a plurality of pixels, and the driving voltages corresponding to different pixels are the same or different.
A device for eliminating image retention, which is characterized by comprising: a memory and a processor;

Wherein, a computer program executable by the processor is stored on the memory;

When the processor reads and executes the computer program, the processor is caused to execute the method according to any one of claims 1 to 7.
A computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program contains at least one piece of code, and the at least one piece of code can be executed by a processor to implement claims 1 to 7 The method of any one of.