CN107170417A - It is used for the device that the second chip is switched to from the first chip in terminal - Google Patents
It is used for the device that the second chip is switched to from the first chip in terminal Download PDFInfo
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- CN107170417A CN107170417A CN201710453896.2A CN201710453896A CN107170417A CN 107170417 A CN107170417 A CN 107170417A CN 201710453896 A CN201710453896 A CN 201710453896A CN 107170417 A CN107170417 A CN 107170417A
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- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 abstract 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
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Abstract
The application, which is provided, is used for the device that the second chip is switched to from the first chip in a kind of terminal, the display module of the terminal includes liquid crystal display and the backlight drive module for driving liquid crystal display, it is characterized in that, described device includes the handover module being all connected with the first chip, the second chip and display module, and described device also includes control module；The control module is used for：Control the power supply module of the liquid crystal display to be continuously the liquid crystal display to power；And, after switching command is received, control the handover module to switch to the default pwm signal of input from MIPI signals, reset signal and the pwm signal for inputting first chip to display module and forbid liquid crystal display reset signal；After the second chip is switched to, the handover module is controlled to input MIPI signals, reset signal and the pwm signal of second chip to the display module.In handoff procedure, the application is not in the phenomenons such as blank screen, splashette, improves Consumer's Experience.
Description
Technical Field
The present application relates to the field of display control technologies, and in particular, to an apparatus for switching from a first chip to a second chip in a terminal.
Background
As the popularity of terminals (e.g., smart phones, tablet computers, etc.) has increased, more and more users tend to use products that are thinner, lighter, and more versatile. Because the integrated functions of the chips (chips capable of independently controlling a series of peripheral devices to form a system) of the terminal are limited, two sets of chips with function difference are required to meet the requirements of users.
In order to meet the design requirements of the terminal, the two chips need to share some external devices, such as a liquid crystal screen, a camera, a sensor, a flash lamp and the like. Taking a liquid crystal display with a large area and a large volume as an example, in the related art, a switch is used for directly switching from one chip to another chip, so that the chips are switched rapidly. However, in the course of implementing the solution of the present application, the inventors found that the following problems exist in the related art:
in the switching process, the switch can directly force the liquid crystal screen to reset, then the current chip is switched to another chip, and abnormal phenomena such as screen blacking and screen flashing can occur on the liquid crystal screen at the moment, so that abnormal display is caused, and the user experience is poor.
Disclosure of Invention
In view of the above, the present application provides an apparatus for switching from a first chip to a second chip in a terminal, which is configured to partially or completely solve the problem of display abnormality caused by forced reset when two chips are switched in the related art.
Specifically, the method is realized through the following technical scheme:
in one aspect, an embodiment of the present application provides a device for switching from a first chip to a second chip in a terminal, where a display component of the terminal includes a liquid crystal screen and a backlight driving module for driving the liquid crystal screen, the device includes a switching module connected to the first chip, the second chip, and the display component, and the device further includes a control module; the control module is used for:
controlling a power supply module of the liquid crystal screen to continuously supply power to the liquid crystal screen; and the number of the first and second groups,
after receiving a switching instruction, controlling the switching module to switch from inputting the MIPI signal, the reset signal and the PWM signal of the first chip to a display component to inputting a preset PWM signal and forbidding a liquid crystal screen reset signal;
and after the second chip is switched to, controlling the switching module to input the MIPI signal, the reset signal and the PWM signal of the second chip to the display component.
Optionally, the switching module includes a first switching unit and a second switching unit; the first switching unit receives MIPI signals from the first chip and the second chip; the second switching unit receives reset signals and PWM signals from the first chip and the second chip, and preset PWM signals and liquid crystal screen reset prohibition signals from the control module;
after the control module receives a switching instruction, the first switching unit receives control of the control module and switches the input of the MIPI signal of the first chip into the input of the MIPI signal of the second chip from the input of the MIPI signal of the first chip into the input of the MIPI signal of the second chip; the second switching unit receives control of the control module, and switches the input of a reset signal and a PWM signal of the first chip to the display assembly into an input preset PWM signal and a prohibition of a reset signal of the liquid crystal screen;
after the second chip is switched to, the first switching unit receives the control of the control module and inputs the MIPI signal of the second chip to the display component; and the second switching unit receives the control of the control module and inputs the reset signal and the PWM signal of the second chip to the display component.
Optionally, the second switching unit includes:
the change-over switch is used for receiving the reset signal and the PWM signal of the first chip and the second chip and the control signal output by the control module, and outputting the reset signal and the PWM signal of the first chip or outputting the reset signal and the PWM signal of the second chip according to the control signal;
the first OR gate is used for receiving the PWM signal output by the change-over switch and the preset PWM signal output by the control module and outputting a processing result to the display component;
and the second OR gate is used for receiving the reset signal output by the change-over switch and the liquid crystal screen reset prohibition signal output by the control module and outputting a processing result to the display component.
Optionally, the second switching unit is further configured to send a frame synchronization signal output by the display component to the first chip and the second chip.
Optionally, the display module further includes a random access memory RAM, and the RAM stores at least one frame of picture data; and the at least one frame of picture data is used for displaying the liquid crystal screen in the switching process of the first chip and the second chip.
On the other hand, an embodiment of the present application provides an apparatus for switching from a first chip to a second chip in a terminal, a display component of the terminal includes a liquid crystal panel and a backlight driving module for driving the liquid crystal panel, the apparatus includes a switching module connected to the first chip, the second chip and the display component, and the apparatus includes a control module for:
controlling a power supply module of the liquid crystal screen to continuously supply power to the liquid crystal screen; and the number of the first and second groups,
after receiving a switching instruction, outputting a preset PWM signal to the display assembly, and controlling the switching module to switch from outputting the MIPI signal and the reset signal of the first chip to the display assembly to outputting a liquid crystal screen reset forbidding signal;
and after the second chip is switched to, controlling the switching module to output the MIPI signal and the reset signal of the second chip to the display assembly.
Optionally, the switching module includes a first switching unit and a second switching unit; the first switching unit receives MIPI signals from the first chip and the second chip; the second switching unit receives reset signals from the first chip and the second chip, and preset PWM signals and liquid crystal screen reset forbidding signals from the control module;
after the control module receives a switching instruction, the first switching unit receives control of the control module and switches the input of the MIPI signal of the first chip into the input of the MIPI signal of the second chip from the input of the MIPI signal of the first chip into the input of the MIPI signal of the second chip; the second switching unit receives control of the control module and switches the reset signal of the first chip input to the display assembly into a reset signal for forbidding the liquid crystal display;
after the second chip is switched to, the first switching unit receives the control of the control module and inputs the MIPI signal of the second chip to the display component; and the second switching unit receives the control of the control module and inputs a reset signal of a second chip to the display component.
Optionally, the second switching unit includes:
the change-over switch is used for receiving reset signals of the first chip and the second chip and control signals output by the control module and outputting the reset signals of the first chip or the second chip according to the control signals;
and the third OR gate is used for receiving the reset signal output by the change-over switch and the liquid crystal screen reset prohibition signal output by the control module and outputting the processing result to the display component.
Optionally, the second switching unit is further configured to send a frame synchronization signal output by the display component to the first chip and the second chip.
Optionally, the display module further includes a random access memory RAM, and the RAM stores at least one frame of picture data; and the at least one frame of picture data is used for displaying the liquid crystal screen in the switching process of the first chip and the second chip.
According to the technical scheme, the control module controls the power supply module to continuously supply power to the liquid crystal screen in the embodiment of the application, so that the phenomena of black screen and the like of the liquid crystal screen caused by power failure in the switching process of the first chip and the second chip can be prevented; after receiving a switching instruction, the control switching module is switched to input a preset PWM signal and a forbidden LCD screen reset signal by an MIPI signal, a reset signal and a PWM signal which are input into the first chip to the display assembly, the liquid crystal screen can be ensured not to be reset in the process of the first chip and the second chip by inputting the forbidden LCD screen reset signal, the preset image can be displayed on the liquid crystal screen by inputting the preset PWM signal, and abnormal phenomena such as black screen or splash screen can be avoided by combining the forbidden LCD screen reset signal and the preset PWM signal. And after the second chip is switched to, controlling the switching module to input the MIPI signal, the reset signal and the PWM signal of the second chip to the display component. Therefore, the problems of screen blacking and screen flashing of the liquid crystal screen can be avoided, and user experience is improved.
Drawings
Fig. 1 is a schematic diagram of a terminal shown in accordance with an exemplary embodiment;
FIG. 2 is a schematic diagram illustrating an apparatus for switching from a first chip to a second chip in a terminal according to another example embodiment;
fig. 3 is a schematic diagram illustrating an apparatus for switching from a first chip to a second chip in a terminal according to yet another example embodiment.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
The device for switching from the first chip to the second chip in the terminal provided by the embodiment of the application is suitable for terminals adopting two operating systems, such as a tablet computer and a smart phone. In the following embodiments of the present application, a smart phone is taken as an example for description.
Because the integrated functions of the chips (chips capable of independently controlling a series of peripheral devices to form a system) of the terminal are limited, two sets of chips with function difference are required to meet the requirements of users.
In order to meet the design requirements of the smart phone, the two chips need to share some external devices, such as a liquid crystal screen, a camera, a sensor, a flash lamp and the like. Taking a liquid crystal display with a large area and a large volume as an example, in the related art, a switch is used for directly switching from one chip to another chip, so that the chips are switched rapidly. However, in the course of implementing the solution of the present application, the inventors found that the following problems exist in the related art:
in the switching process, due to the fact that the power-off of the chip before switching and the power-on of the chip after switching are conducted, the RST signal is pulled down for a period of time, and forced reset is formed. In addition, the input signal of the backlight driving module, i.e. the PWM signal, is also pulled down passively for a period of time. The above two points can cause phenomena such as screen blacking and screen flashing, which causes abnormal display and poor user experience.
To this end, the embodiment of the present application provides an apparatus for switching from a first chip to a second chip in a terminal, a display component of the terminal includes a liquid crystal panel 102 and a backlight driving module 103 for driving the liquid crystal panel, as shown in fig. 1, the apparatus includes a switching module 106 connected to a first chip 104, a second chip 105 and the display component, and the apparatus further includes a control module 100; the control module 100 is configured to:
controlling a power supply module 101 of the liquid crystal screen 102 to continuously supply power to the liquid crystal screen 102; and the number of the first and second groups,
after receiving the switching instruction, the control switching module 106 switches the input of the MIPI signal, the reset signal and the PWM signal of the first chip 104 to the input of the preset PWM signal and the prohibition of the reset signal of the liquid crystal panel from the input of the MIPI signal, the reset signal and the PWM signal of the first chip 104 to the display module; after switching to the second chip 105, the switching module 106 is controlled to input the MIPI signal, the reset signal, and the PWM signal of the second chip 105 to the display component.
The MIPI signal is picture data transmitted by using an MIPI (Mobile Industry processor interface) signal switch. When the MIPI signal switch is used for transmission, the picture data output by the first chip or the second chip needs to be processed into a preset format, and the picture data is called as an MIPI signal in the transmission process of the MIPI signal switch. After the MIPI signal is transmitted to the liquid crystal screen, picture data are obtained through analysis.
It should be noted that, after the PWM signal or the preset PWM signal is input to the backlight driving module, the backlight driving module outputs the corresponding backlight brightness according to the duty ratio of the PWM signal, that is, the liquid crystal display displays the backlight brightness corresponding to the PWM signal.
The power supply module is controlled to continuously supply power to the liquid crystal screen, the phenomenon of black screen caused by power failure of the liquid crystal screen can be prevented, the liquid crystal screen can be prevented from being reset in the process of the first chip and the second chip by inputting the forbidden liquid crystal screen reset signal, the liquid crystal screen can display the preset image by inputting the preset PWM signal, the forbidden liquid crystal screen reset signal and the preset PWM signal are combined, and the abnormal phenomena of black screen or screen flashing and the like of the liquid crystal screen can be avoided. Therefore, the problems of screen blacking and screen flashing of the liquid crystal screen can be avoided, and user experience is improved.
In an embodiment of the present application, the switching module includes: a first switching unit and a second switching unit. The first switching unit receives MIPI signals from the first chip and the second chip; the second switching unit receives reset signals and PWM signals from the first chip and the second chip, and preset PWM signals and liquid crystal screen reset prohibition signals from the control module. After the control module receives the switching instruction,
the first switching unit is controlled by the control module to switch the input of the MIPI signal of the first chip into the input of the MIPI signal of the second chip; and the second switching unit is controlled by the control module to switch the input of the reset signal and the PWM signal of the first chip into the input of a preset PWM signal and the input of a reset signal of the liquid crystal screen.
After the second chip is switched to, the first switching unit is controlled by the control module to input the MIPI signal of the second chip to the display component; and the second switching unit receives the reset signal and the PWM signal of the second chip which are input to the display component under the control of the control module.
It should be noted that, after the preset PWM signal is input into the display module, the liquid crystal panel may display the preset brightness, for example, if the preset PWM signal is 100% duty ratio, the liquid crystal panel is in the brightest state. For another example, the preset PWM signal may be determined according to the first few frames of picture data of the first chip before switching, so that the fluctuation of the brightness of the liquid crystal panel may be small. The technical personnel in the field can set up according to the specific situation, and this application is not limited.
In an embodiment of the present application, the first switching unit may be implemented by using a MIPI signal switch, and the MIPI signal switch may be switched from a first position to a second position when being triggered, so as to select and output a MIPI signal from the first chip and the second chip. Of course, those skilled in the art may select other switching circuit implementations according to actual situations, and the application is not limited thereto.
In an embodiment of the present application, the second switching unit may include a switch, a first or gate, and a second or gate. Wherein,
and the change-over switch is used for receiving the reset signal and the PWM signal of the first chip and the second chip and the control signal output by the control module, and outputting the reset signal and the PWM signal of the first chip or outputting the reset signal and the PWM signal of the second chip according to the control signal.
And the first OR gate is used for receiving the PWM signal output by the change-over switch and the preset PWM signal output by the control module and outputting a processing result to the display component.
And the second OR gate is used for receiving the reset signal output by the selector switch and the liquid crystal screen reset forbidding signal output by the control module and outputting the processing result to the display component.
In order to ensure that the image data of the liquid crystal display and the first chip or the second chip are synchronized, in an embodiment of the present application, the second switching unit is further configured to send a frame synchronization signal output by the display module to the first chip or the second chip.
In an embodiment of the present application, the display module further includes a random access memory RAM, where at least one frame of picture data of the first chip (before switching) is stored in the RAM, and then the at least one frame of picture data is refreshed on the liquid crystal display in the switching process, so as to ensure that the liquid crystal display has display contents, and problems such as screen omission and screen blank do not occur.
The apparatus for switching from the first chip to the second chip in the terminal is further described below with reference to specific circuits.
As shown in fig. 2, the apparatus includes: the mobile terminal comprises a control module 200, a power supply module 201, a liquid crystal display 202, a backlight driving module 203, a first chip 204, a first chip 205, an MIPI signal switch 206 and a second switch unit 207. The liquid crystal panel 202 and the backlight driving module 203 constitute a display assembly. The power supply module 201 supplies power to the liquid crystal screen 202, and the first chip 204 and the first chip 205 are connected with the liquid crystal screen 202 by multiplexing the MIPI signal switch 206; the backlight driving module 203 is connected to the liquid crystal panel 202. The control module 200 is connected to the first chip 204 and the first chip 205 through a serial communication interface. The second switching unit 207 is connected to the backlight driving module 203.
The switching process of the device shown in fig. 2 is as follows:
before switching, the control module 200 keeps outputting a high level signal through the first output terminal GPIO1, so that the power supply module 201 continuously supplies power to the liquid crystal display 202. The second output terminal GPIO2, the third output terminal GPIO3 and the fourth output terminal GPIO4 of the control module 200 output low level signals. Upon receiving the above-described low level signal, the switch 2071 transmits the PWM signal and the reset signal RST from the first chip 204 to the first or gate 2072 and the second or gate 2073, respectively, and transmits the frame synchronization signal TE from the liquid crystal panel 202 to the first chip 204. The MIPI signal switch 206 transmits the MIPI signal from the first chip 204 to the liquid crystal panel 202. When the control module 200 outputs a low level, the output terminal of the first or gate 2072 is determined by the PWM signal, and if the PWM signal is a high level signal, the output terminal of the first or gate 2072 outputs a high level signal to the backlight driving module 203; if the PWM signal is a low level signal, the output terminal of the first or gate 2072 outputs the low level signal to the backlight driving module 203. I.e. the output signal of the output of the first or gate 2072 is completely determined by the PWM signal. Similarly, when the control module 200 outputs a low level, the output signal of the second or gate 2073 is determined by the RST signal and is sent to the liquid crystal panel 202. The liquid crystal panel 202 generates a frame synchronization signal TE from the picture data and transmits the frame synchronization signal TE to the selector switch 2071.
When a user needs to use a function other than the first chip 204, the first chip 204 needs to be switched to the first chip 205, and the smartphone generates a switching instruction according to a triggering operation of the user.
When the control module 200 receives the switching instruction, the power supply enabling signal is continuously output from the first output terminal GPIO1, so that the power supply module 201 continuously supplies power to the liquid crystal display 202.
The control module 200 outputs a preset PWM signal, for example, a high level signal with a duty ratio of 100%, from the second output terminal GPIO2, and the output terminal of the first or gate 2072 outputs the high level signal, so that the control function of the PWM signal is disabled. Since the second output terminal GPIO2 continuously outputs the high level signal, which is substantially the largest duty ratio of the PWM signal, the backlight driving module 203 drives the backlight to keep the liquid crystal panel 202 in the brightest state. Of course, the preset PWM signal may be adjusted according to a specific scene, so that the liquid crystal display 202 displays the preset brightness.
In an embodiment of the present application, when the switching instruction is received, the duty ratio of the PWM signal output by the first chip 204 is gradually increased from the current state (the duty ratio of the PWM signal corresponding to the time when the switching instruction is received) to 100%, that is, the brightness is adjusted to the maximum. Accordingly, the second output terminal GPIO2 of the control module 200 outputs the highlight command, the duty ratio of the PWM signal reaching the backlight driving module after passing through the first or gate 2072 is 100%, at this time, the chip can be powered off (the PWM signal disappears) before switching, that is, the second output terminal GPIO2 maintains the brightest state in the switching process.
The control module 200 outputs a high signal (i.e. disables the lcd reset signal) from the third output terminal GPIO3, and the output terminal of the second or gate 2073 outputs a high signal, so that the control function of the RST signal (e.g. the low signal is active) is disabled. Since the third output terminal GPIO3 continuously outputs the high-level signal, the first chip 204 outputs the RST signal whether it is a high-level signal or a low-level signal, and the output terminal of the second or gate 2073 still outputs the high-level signal. That is, the control module can ensure that the liquid crystal display 202 cannot be reset during the power-down process of the first chip 204 and the power-up process of the first chip 205.
The control module 200 outputs a high-level signal from the fourth output terminal GPIO4 to be sent to the enable terminal EN of the switch 2071 and the MIPI signal switch 206. The changeover switch 2071 is operated to disconnect the first chip 204 and change over to connect the first chip 205, that is, to change over from transmitting the PWM signal, the RST signal and the TE signal to the first chip 204 to transmitting the PWM signal, the RST signal and the TE signal to the first chip 205. The MIPI signal switch 206 is activated to disconnect the first chip 204 and switch to connect the first chip 205, that is, to switch from transmitting the MIPI signal to the first chip 204 to transmitting the MIPI signal to the first chip 205.
When receiving a switching instruction, the first chip 204 sends at least one frame of picture data (including the last frame of picture data of the first chip 204 and multi-frame of picture data before the last frame, or preset picture data during switching) sent to the liquid crystal panel 202 to the RAM of the driving module of the liquid crystal panel 202, and during switching, the driving module continuously refreshes the at least one frame of picture data to the liquid crystal panel 202. Thus, during the switching process, the lcd 202 keeps displaying the at least one frame.
It should be noted that, when the control module 200 outputs the high level signal through the GPIO2, the GPIO3, and the GPIO4, the width and the sequence of the high level signal are set according to an actual scene. In order to prevent the screen flash caused during the switching process, after the high level signal outputted from the GPIO2 reaches the first or gate 2072, the duty ratio of the PWM signal of the first chip needs to be gradually changed to 100% duty ratio before the switching.
After the first chip 205 controls the liquid crystal panel 202, the control module 200 outputs a low level signal through the second output terminals GPIO2, GPIO3 and GPIO 4. At this time, the first chip 205 adjusts the duty ratio of the PWM signal according to the picture data, and can adjust the backlight luminance information of the liquid crystal panel 202.
In an embodiment of the present application, before the first chip 205 sends the first frame of picture data, the duty ratio of the PWM signal is adjusted to the maximum to make the backlight of the liquid crystal display 202 brightest, and then the duty ratio of the PWM signal is adjusted according to the backlight brightness information corresponding to the picture data. The first chip 205 resets the liquid crystal panel 202 according to the picture data. The first chip 205 transmits picture data through the MIPI signal switch 206 according to the frame synchronization signal TE from the liquid crystal panel 202.
Heretofore, in the embodiment of the present application, the first chip 204 is switched to the first chip 205 while the liquid crystal panel 202 maintains display brightness and displays a screen. Therefore, the device provided by the application can not have the problems of screen blackness, screen flashing and picture brightness, and improves the user experience.
Another embodiment of the present application further provides a device for switching from a first chip to a second chip in a terminal, a display component of the terminal includes a liquid crystal display and a backlight driving module for driving the liquid crystal display, the device includes a switching module connected to the first chip, the second chip and the display component, the device includes a further control module for:
controlling a power supply module of the liquid crystal screen to continuously supply power to the liquid crystal screen; and the number of the first and second groups,
after receiving a switching instruction, outputting a preset PWM signal to the display assembly, and controlling the switching module to switch from outputting the MIPI signal and the reset signal of the first chip to the display assembly to outputting a liquid crystal screen reset forbidding signal;
and after the second chip is switched to, controlling the switching module to output the MIPI signal and the reset signal of the second chip to the display assembly.
In an embodiment of the present application, the switching module includes a first switching unit and a second switching unit. The first switching unit receives MIPI signals from the first chip and the second chip; the second switching unit receives reset signals from the first chip and the second chip, and preset PWM signals and liquid crystal screen reset prohibition signals from the control module;
after the control module receives a switching instruction, the first switching unit is controlled by the control module to switch the input of the MIPI signal of the first chip into the input of the MIPI signal of the second chip; the second switching unit is controlled by the control module to switch the reset signal of the first chip input into the display component into an input prohibition liquid crystal screen reset signal;
after the second chip is switched to, the first switching unit is controlled by the control module to input the MIPI signal of the second chip to the display component; and the second switching unit is controlled by the control module to input a reset signal of the second chip to the display component.
In an embodiment of the present application, the second switching unit includes:
the selector switch is used for receiving the reset signals of the first chip and the second chip and the control signal output by the control module and outputting the reset signal of the first chip or the second chip according to the control signal;
and the third OR gate is used for receiving the reset signal output by the selector switch and the liquid crystal screen reset prohibition signal output by the control module and outputting the processing result to the display component.
In an embodiment of the application, the second switching unit is further configured to send a frame synchronization signal output by the display module to the first chip and the second chip.
In an embodiment of the application, the display module further includes a random access memory RAM. The RAM stores at least one frame of picture data; the at least one frame of picture data is used for the liquid crystal screen to display in the switching process of the first chip and the second chip
The apparatus for switching from the first chip to the second chip in the terminal is further described below with reference to specific circuits.
In another embodiment of the present application, as shown in fig. 3, the apparatus includes a control module 300, a power supply module 301, a liquid crystal screen 302, a backlight driving module 303, a first chip 304, a second chip 305, and a second switching unit 307. The power supply module 301 supplies power to the liquid crystal screen 302, and the first chip 304 and the second chip 305 are connected with the liquid crystal screen 302 by multiplexing the MIPI signal switch 306; the backlight driving module 303 is connected to the liquid crystal panel 302, and both of them constitute a display module. The apparatus provided in the embodiment of the present application is different from the apparatus shown in fig. 2 in that the second switching unit 307 in the apparatus shown in fig. 3 includes only one or gate. The second switching unit 307 includes a switching switch 3071 and a third or gate 3072. The control terminal EN of the switch 3071 is connected to the fourth output terminal GPIO4 of the control module 300, the third input terminal IN3 thereof is connected to the RST signal output terminal of the first chip 304, the fourth input terminal IN4 thereof is connected to the RST signal output terminal of the second chip 305, the fifth input terminal IN5 thereof is connected to the TE signal input terminal of the first chip 304, and the sixth input terminal IN6 thereof is connected to the TE signal input terminal of the second chip 305. The third or gate 3072 has a first input terminal connected to the second output terminal OUT2 (i.e., the RST signal output terminal) of the switch 3071, a second input terminal connected to the third output terminal GPIO3 of the control module 300, and an output terminal connected to the reset terminal RST of the liquid crystal panel 302. And, the third output terminal GPIO3 of the control module 300 is connected to the backlight driving module 303.
The switching process of the apparatus shown in fig. 3 is as follows:
the second output terminal GPIO2 of the control module 200 obtains the backlight luminance information from the first chip 304 through the serial communication interface, and adjusts the duty ratio of the PWM signal and then sends the PWM signal to the backlight driving module 303.
The third output terminal GPIO3 and the fourth output terminal GPIO4 of the control module 200 output low level signals. Upon receiving the low level signal, the switch 2071 transmits the RST signal from the first chip 204 to the third or gate 3072, and transmits the TE signal from the liquid crystal panel 202 to the first chip 304. The MIPI signal switch 306 transmits the MIPI signal from the first chip 304 to the liquid crystal screen 302. Upon receiving the low level signal, the output signal of the third or gate 3072 is determined by the RST signal and is transmitted to the liquid crystal panel 302. The liquid crystal panel 302 generates a frame synchronization signal TE from the picture data and sends it to the switch 3071.
When a user needs to use a function except the first chip 304, switching from the first chip 304 to the second chip 305 is needed, and the smart phone generates a switching instruction according to a triggering operation of the user.
The control module 300 uses the backlight brightness information of at least one frame of picture from the first chip 304 as the backlight brightness information of the liquid crystal screen 302 during the switching process, i.e. the control module 300 keeps the duty ratio of the PWM signal unchanged.
The control module 300 outputs a high signal from the third output terminal GPIO3, and the output terminal of the third or gate 3072 outputs a high signal, so that the control function of the RST signal (e.g., the low signal is active) is disabled. Since the third output terminal GPIO3 continuously outputs the high-level signal, the first chip 304 outputs the RST signal whether it is a high-level signal or a low-level signal, and the output terminal of the third or gate 3073 still outputs the high-level signal. That is, the first chip 304 cannot reset the liquid crystal panel 302.
The control module 300 outputs a high level from the fourth output terminal GPIO4 to be sent to the enable terminal EN of the switch 3071 and the MIPI signal switch 306. The changeover switch 3071 operates to disconnect the first chip 304 and change over to connect the second chip 305, that is, to change over from transmitting the RST signal and the TE signal to the first chip 304 to transmitting the RST signal and the TE signal to the second chip 305. The MIPI signal switch 306 is activated to disconnect the first chip 304 and switch to connect the second chip 305, that is, to switch from transmitting the MIPI signal to the first chip 304 to transmitting the MIPI signal to the second chip 305.
When receiving a switching instruction, the first chip 304 sends at least one frame of image data (or preset image data) sent to the liquid crystal screen 302 to the RAM of the driving module in the liquid crystal screen 302, and during the switching process, the driving module continuously refreshes the at least one frame of image data to the liquid crystal screen 302. Thus, during the switching process, the lcd 202 keeps displaying at least one frame of the image transmitted from the first chip 304.
When the switching command, the reset prohibition command, and the control switching command are set to the high level, the width of the high level is set according to the actual situation. And, the switching instruction precedes the high level signals output by GPIO3 and GPIO 4. The high-level signals output by the GPIO3 and the GPIO4 can be generated simultaneously, but it is necessary to ensure that the high-level signal output by the GPIO3 reaches the or gate before the high-level signal output by the GPIO4 reaches the switch 3071 and the MIPI signal switch 306.
When the switched chip, i.e. the second chip 305 controls the liquid crystal panel 202, the control module 300 receives the backlight brightness information from the second chip 305 to adjust the duty ratio of the PWM signal, and then outputs the duty ratio to the backlight driving module 303 through the second output terminal GPIO 2. The control module 300 outputs a low level signal through the third output terminal GPIO3 and outputs a low level signal through the fourth output terminal GPIO 4. At this time, the second chip 305 resets the liquid crystal screen 302 according to actual needs (sleep wakeup, power on/off). Under the action of the frame synchronization signal TE of the liquid crystal screen 302, the second chip 305 transmits picture data through the MIPI signal switch 306.
In the embodiment of the present application, during the process of switching the first chip 304 to the second chip 305, the liquid crystal panel 302 maintains the display brightness and the display image. The control module 300 adjusts the backlight brightness information of the liquid crystal screen 302, so that the problems of black screen, flashing screen and only bright non-display picture are avoided, and the user experience is improved. In another embodiment of the application, the brightness of the liquid crystal screen is kept consistent and the picture is displayed in the chip switching process.
It should be noted that, in the above embodiments of the present application, the control module may be implemented by a single chip microcomputer MCU in the related art. The power supply module can be implemented by a power supply chip in the related art, and the power supply chip can provide an interface voltage of 1.8V and a bias voltage of about ± 5V. The liquid crystal panel may employ a liquid crystal panel (including a driving chip configured to write picture data) in the related art. The backlight driving module can be implemented by using a backlight driving chip in the related art. The first chip and the second chip can be realized by adopting a special chip of a related mobile phone. The change-over switch can be implemented by a single-pole double-throw switch commonly used in the related art. The first or gate and the second or gate can be realized by a common or gate chip. The Serial communication interface may be an Integrated Circuit bus (IIC), a Serial Peripheral Interface (SPI), a Universal Asynchronous Receiver/Transmitter (UART), or the like. After the chips or circuits are selected, those skilled in the art can set the chips or circuits according to specific scenarios, so that the chips or circuits are kept in working states.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Claims (10)
1. A device for switching from a first chip to a second chip in a terminal is provided, wherein a display component of the terminal comprises a liquid crystal screen and a backlight driving module for driving the liquid crystal screen, and the device is characterized by comprising a switching module connected with the first chip, the second chip and the display component, and a control module; the control module is used for:
controlling a power supply module of the liquid crystal screen to continuously supply power to the liquid crystal screen; and the number of the first and second groups,
after receiving a switching instruction, controlling the switching module to switch from inputting the MIPI signal, the reset signal and the PWM signal of the first chip to a display component to inputting a preset PWM signal and forbidding a liquid crystal screen reset signal; and after the second chip is switched to, controlling the switching module to input the MIPI signal, the reset signal and the PWM signal of the second chip to the display component.
2. The apparatus of claim 1, wherein the switching module comprises a first switching unit and a second switching unit; the first switching unit receives MIPI signals from the first chip and the second chip; the second switching unit receives reset signals and PWM signals from the first chip and the second chip, and preset PWM signals and liquid crystal screen reset prohibition signals from the control module;
after the control module receives a switching instruction, the first switching unit receives control of the control module and switches the input of the MIPI signal of the first chip into the input of the MIPI signal of the second chip from the input of the MIPI signal of the first chip into the input of the MIPI signal of the second chip; the second switching unit receives control of the control module, and switches the input of a reset signal and a PWM signal of the first chip to the display assembly into an input preset PWM signal and a prohibition of a reset signal of the liquid crystal screen;
after the second chip is switched to, the first switching unit receives the control of the control module and inputs the MIPI signal of the second chip to the display component; and the second switching unit receives the control of the control module and inputs the reset signal and the PWM signal of the second chip to the display component.
3. The apparatus of claim 2, wherein the second switching unit comprises:
the change-over switch is used for receiving the reset signal and the PWM signal of the first chip and the second chip and the control signal output by the control module, and outputting the reset signal and the PWM signal of the first chip or outputting the reset signal and the PWM signal of the second chip according to the control signal;
the first OR gate is used for receiving the PWM signal output by the change-over switch and the preset PWM signal output by the control module and outputting a processing result to the display component;
and the second OR gate is used for receiving the reset signal output by the change-over switch and the liquid crystal screen reset prohibition signal output by the control module and outputting a processing result to the display component.
4. The apparatus of claim 2, wherein the second switching unit is further configured to send a frame synchronization signal output by the display module to the first chip and the second chip.
5. The apparatus of claim 1, further comprising a Random Access Memory (RAM) in the display module, wherein the RAM stores at least one frame of picture data; and the at least one frame of picture data is used for displaying the liquid crystal screen in the switching process of the first chip and the second chip.
6. A device for switching from a first chip to a second chip in a terminal, a display component of the terminal comprises a liquid crystal screen and a backlight driving module for driving the liquid crystal screen, the device comprises a switching module connected with the first chip, the second chip and the display component, and the device is characterized by comprising a control module for:
controlling a power supply module of the liquid crystal screen to continuously supply power to the liquid crystal screen; and the number of the first and second groups,
after receiving a switching instruction, outputting a preset PWM signal to the display assembly, and controlling the switching module to switch from outputting the MIPI signal and the reset signal of the first chip to the display assembly to outputting a liquid crystal screen reset forbidding signal;
and after the second chip is switched to, controlling the switching module to output the MIPI signal and the reset signal of the second chip to the display assembly.
7. The apparatus of claim 6, wherein the switching module comprises a first switching unit and a second switching unit; the first switching unit receives MIPI signals from the first chip and the second chip; the second switching unit receives reset signals from the first chip and the second chip, and preset PWM signals and liquid crystal screen reset forbidding signals from the control module;
after the control module receives a switching instruction, the first switching unit receives control of the control module and switches the input of the MIPI signal of the first chip into the input of the MIPI signal of the second chip from the input of the MIPI signal of the first chip into the input of the MIPI signal of the second chip; the second switching unit receives control of the control module and switches the reset signal of the first chip input to the display assembly into a reset signal for forbidding the liquid crystal display;
after the second chip is switched to, the first switching unit receives the control of the control module and inputs the MIPI signal of the second chip to the display component; and the second switching unit receives the control of the control module and inputs a reset signal of a second chip to the display component.
8. The apparatus of claim 7, wherein the second switching unit comprises:
the change-over switch is used for receiving reset signals of the first chip and the second chip and control signals output by the control module and outputting the reset signals of the first chip or the second chip according to the control signals;
and the third OR gate is used for receiving the reset signal output by the change-over switch and the liquid crystal screen reset prohibition signal output by the control module and outputting the processing result to the display component.
9. The apparatus of claim 7, wherein the second switching unit is further configured to send a frame synchronization signal output by the display module to the first chip and the second chip.
10. The apparatus of claim 6, further comprising a Random Access Memory (RAM) in the display module, wherein the RAM stores at least one frame of picture data; and the at least one frame of picture data is used for displaying the liquid crystal screen in the switching process of the first chip and the second chip.
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Address after: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Patentee after: Qingdao Hisense Mobile Communication Technology Co.,Ltd. Address before: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Patentee before: HISENSE MOBILE COMMUNICATIONS TECHNOLOGY Co.,Ltd. |
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