JP2002351436A - Display device, and method for making display device move to and return from power-saving mode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a plurality of microcomputers move to and return from a power-saving mode cooperatively. SOLUTION: When a slave microcomputer 120 of a liquid crystal display part 12 has a factor of moving to the power-saving mode, that is reported to a master microcomputer 110 of a control box 11 through a communication line. When a factor of moving to the power-saving mode has occurred in the master microcomputer 110 or it receives the report, the master microcomputer 110 sends a request to move to the power-saving mode to the slave microcomputer 120 and moves to the power-saving mode. The slave microcomputer 120 having received the moving request also moves to the power-saving mode. The master microcomputer 110 or slave microcomputer 120 where a factor of returning has occurred, returns from the power-saving mode and sends a request to return to the opposite side by using an interruption signal line 132, so that the opposite side also returns from the mode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device and a method for transitioning and returning the display device to a low power consumption mode. The present invention relates to a transition to a power mode and a return method.

[0002]

2. Description of the Related Art In recent years, there has been a remarkable demand for high-performance display (display) devices, such as a large screen and high definition, and diversification of information to be displayed and functions to be processed.
On the other hand, there is also a demand for thinner and lighter display devices, and there is a demand for a display device that satisfies conflicting demands for higher functionality and thinner and lighter weight. In response to such demands, a display device in which a control box for performing signal processing and a display unit for displaying an image are separated has appeared.

A display device having such a configuration will be described with reference to FIG. Liquid crystal display device 20
Is a control box 2 that acquires RGB signals from an external device such as the computer 30 and performs signal processing.
1 and a liquid crystal display section 22 for displaying an image based on a display signal from the control box 21. The control box 21 and the liquid crystal display unit 22 are connected by a cable 23 for transmitting various signals.

The control box 21 receives analog RGB signals sent from the computer 30 via an RGB cable 40 and performs signal conversion processing such as conversion into digital signals in accordance with the liquid crystal display unit 22. The converted image signal for display is sent to the liquid crystal display unit 22 via the cable 23, and the liquid crystal display unit 22 performs display processing. Control box 21 and liquid crystal display unit 22
Includes an MPU (Micro Processing Unit) that performs arithmetic processing
A microcomputer in which a microcomputer and a memory are integrated on one chip (hereinafter, referred to as a microcomputer) is mounted, and executes predetermined processes.

[0005]

However, in a display device equipped with a plurality of microcomputers having different processing functions as described above, each of the microcomputers cooperatively transits to the low power consumption mode and returns. And it is difficult to achieve low power consumption.

[0006] In recent years, in electronic equipment including a display device, it is required to reduce power consumption, particularly during standby, in consideration of the influence on the global environment. Recent electronic devices include:
Microcomputers are often built-in, but many of these micro-computers have a function of switching to sleep in which the oscillation clock is stopped and the control is stopped in advance in a low power consumption mode. As one method of reducing the power consumption of such an electronic device during standby, there is a method of causing a built-in microcomputer to transition to sleep during standby.

However, in a device using a plurality of microcomputers, for example, a display device including the control box 21 and the liquid crystal display unit 22, a mechanism for making the two microcomputers cooperate to perform transition to and return from sleep. However, the transition to the sleep mode and the return to the sleep mode are performed for only one of the microcomputers.

For example, if no RGB signal is input to the control box 21 for a certain period, the microcomputer mounted on the control box 21 is shifted to sleep. After the input of the RGB signal, the device returns from sleep. However, the liquid crystal display unit 22 is in the normal state while the control box 21 is in the sleep state.
For this reason, the power consumption of the control box 21 can be reduced during a standby state such as when the RGB signal is not input, but the power consumption of the liquid crystal display unit 22 cannot be reduced. As a result, it has been difficult to reduce the power consumption of the entire display device during standby.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and describes a display device for causing a plurality of microcomputers to cooperatively transition and return to a low power consumption mode, and a method for transitioning and returning to the low power consumption mode. The purpose is to provide.

[0010]

According to the present invention, in order to solve the above-mentioned problems, in a display device comprising a plurality of processing units for executing a predetermined processing function, communication is performed with another processing unit in the display device. Communication means, interrupt processing means for generating an interrupt signal for the other processing unit and inputting the interrupt signal generated by the other processing unit, and transition to the low power consumption mode in the other processing unit Information via the communication means or the interrupt processing means, or the cause of the transition or the cause of the return has occurred in the own processing unit. In this case, the own processing unit transitions to the low power consumption mode or returns from the low power consumption mode, and the A control unit for requesting the processing unit to transition to or return to the low power consumption mode; a communication unit for communicating with the master processing unit; and an interrupt generated by the master processing unit. An interrupt processing means for inputting a signal and generating an interrupt signal to the master processing unit; and generating the occurrence information when the cause of the transition or the cause of the return occurs and the communication means or the interrupt processing. Means for transmitting to the master processing unit, transitioning the own processing unit to the low power consumption mode or returning from the low power consumption mode in response to a request from the master processing unit, and performing the return as necessary. And a control unit for returning from the power consumption mode based on occurrence of a factor that causes the slave processing unit. Display apparatus characterized by, is provided.

The display device having such a configuration is configured such that the master processing unit and the slave processing unit can exchange information by the communication unit and the interrupt processing unit. In the normal state, the control means of the master processing unit and the control unit of the slave processing unit both check whether or not a factor for transition to the low power consumption mode occurs in the own processing unit. The control unit of the slave processing unit transmits the cause of the transition to the master processing unit by the communication unit or the interrupt processing unit when a transition occurs. The control unit of the master processing unit, when acquiring that a transition factor has occurred in the slave processing unit via the communication unit or the interrupt processing unit, or when a transition factor has occurred in the own processing unit, To the low power consumption mode, and requests the slave processing unit to transition to the low power consumption mode by the communication means or the interrupt processing means. When the control unit of the slave processing unit acquires the request via the communication unit or the interrupt processing unit, the control unit shifts to the low power consumption mode. When the master processing unit is in the low power consumption mode, if a factor that causes a return due to an interrupt signal from an external device or the like occurs, the mode returns to the normal mode, and the communication unit or the interrupt processing unit sets the slave to return from the low power consumption mode. Request processing unit. The slave processing unit returns from the low power consumption mode in response to a request. Further, when the slave processing unit is in the low power consumption mode and a factor occurs due to an interrupt signal from an external device or the like, the system returns from the low power consumption mode as necessary and returns to the master processing unit. Signals that a factor has occurred.

According to another aspect of the present invention, there is provided a display apparatus comprising a plurality of processing units for executing a predetermined processing function, the method comprising:
A master processing unit and a slave processing unit including a communication unit for exchanging predetermined information data, and an interrupt processing unit for generating an interrupt signal to the other party and inputting the interrupt signal generated by the other party, are usually provided with a master processing unit and a slave processing unit. Detecting, in the state, whether the factor causing the master processing unit and the slave processing unit to transition to the low power consumption mode has occurred, and the master processing unit having the slave processing unit Collecting information on whether a transition factor has occurred, and the master processing unit detecting that the transition factor has occurred in its own processing unit, or the slave processing unit based on the collected information. If it detects that a transition factor has occurred,
Requesting the slave processing unit to transition to the low power consumption mode using the communication unit, and causing the own processing unit to transition to the low power consumption mode, and, in response to the request, the slave processing unit A step of transitioning to the low power consumption mode, comprising: a step of transitioning to the low power consumption mode; and a factor causing the master processing unit or the slave processing unit to return from the low power consumption mode during the low power consumption mode. Detecting that the processing unit has returned from the low power consumption mode, checking the state of another processing unit using the communication unit, and setting the other processing unit to the low power consumption mode. Requesting the other processing unit to return from the low power consumption mode using the interrupt processing means, A processing unit having received the request, returning the own processing unit from the low power consumption mode in response to the request, and a procedure for returning from the low power consumption mode, comprising: A method for transitioning to and returning from the low power consumption mode is provided.

The display device which performs the transition to and return from the low power consumption mode in such a procedure has a configuration in which the master processing unit and the slave processing unit can exchange information by the communication means and the interrupt processing means. It has become. In the transition to the low power consumption mode, the master processing unit and the slave processing unit each detect whether or not a factor for transition to the low power consumption mode has occurred in the normal state, and the master processing unit transitions to the slave processing unit. Gather information about whether the factor has occurred. When the master processing unit detects that a factor that causes a transition to the own processing unit has occurred, or when the master processing unit detects that a factor that causes a transition to the slave processing unit has occurred based on the collected information, a low level is set for the slave processing unit. A request is made for a transition to the power consumption mode, and the own processing unit is transitioned to the low power consumption mode. The slave processing unit also transitions to the low power consumption mode according to the request. When returning from the low power consumption mode, when the master processing unit or the slave processing unit detects that a factor for returning from the low power consumption mode has occurred in the low power consumption mode, first, the own processing unit is reduced in power consumption. Return from power mode. Next, the state of another processing unit is checked, and when the other processing unit is in the low power consumption mode, a request to return from the low power consumption mode is made. The processing unit that has received the request returns its own processing unit from the low power consumption mode in response to the request.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a display device according to an embodiment of the present invention.

The display device according to the present invention comprises a control box 11 having a master microcomputer 110 for processing a display signal input from the outside and a liquid crystal display section 12 having a slave microcomputer 120 for controlling display processing. Be composed. The master microcomputer 110 and the slave microcomputer 120 are connected to a control line 13 including a communication line 131 and an interrupt signal line 132.
Information is exchanged by

Normally, a master microcomputer 110 mounted on the control box 11 controls the entire control box 11 and converts a display signal input from an external device such as a computer into a signal that can be displayed on the liquid crystal display unit 12. The processing is performed and transmitted via the communication line 131. In addition, a process of acquiring information on the state of the liquid crystal display unit 12 from the slave microcomputer 120 using the communication line 131 is performed. On the other hand, slave microcomputer 1
Reference numeral 20 controls the entire liquid crystal display unit 12 and displays a signal input from the master microcomputer 110 via the communication line 131.

Further, the master microcomputer 110 and the slave microcomputer 120 constantly check whether or not a factor causing a transition to a predetermined low power consumption mode has occurred. 11
0 and the slave microcomputer 120 transition to the low power consumption mode in cooperation. Similarly, when a factor causing the master microcomputer 110 or the slave microcomputer 120 to return from the low power consumption mode occurs in the low power consumption mode, the master microcomputer 110 and the slave microcomputer 120 similarly cooperate with each other to operate in the low power consumption mode. Return from

Here, the low power consumption mode indicates an operation state in which power consumption is suppressed by temporarily stopping operations of the master microcomputer 110 and the slave microcomputer 120. For example, the oscillation clock is stopped and a sleep state is set in which all operations are suspended until an interrupt signal is input. In the sleep state, for example, the liquid crystal display unit 12 suspends display to reduce power consumption. Hereinafter, the sleep mode is a low power consumption mode for suppressing power consumption.

Next, the details of the master microcomputer 110 and the slave microcomputer 120 and the transition to and return from sleep mode will be described. FIG. 2 is a configuration diagram of a display device according to an embodiment of the present invention. The same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

The master microcomputer 110 has a communication interface (hereinafter, I / O) for communicating with the slave microcomputer 120.
/ F) 111, an interrupt I / F 112 for controlling the input and output of an interrupt signal, and a CPU (Central Processing Unit) for executing the processing of the master microcomputer 110
ng Unit) 113, ROM (R
ead Only Memory) 114, RA for temporarily storing data
An M (Random Access Memory) 115, a signal I / F 116 for inputting a display signal from the outside, and an internal bus 117 for connecting each unit.

The slave microcomputer 120 has a communication I / F 121 and an interrupt I / F 1 like the master microcomputer 110.
22, an external I / F 126 connected to external devices such as a CPU 123, a ROM 124, a RAM 125, and a switch, and an internal bus 127.

The communication I / Fs 111 and 121 are communication means for exchanging information between the master microcomputer 110 and the slave microcomputer 120 via the communication line 131.
The interrupt I / Fs 112 and 122 are interrupt processing means for generating an interrupt signal for the master microcomputer 110 or the slave microcomputer 120 of the other party, inputting the interrupt signal generated by the other party, and transmitting the interrupt signal to the CPUs 113 and 123. .

The CPUs 113 and 123 are connected to the internal bus 117
Is a control means for reading the programs recorded in the ROMs 114 and 124 via the CPU and executing predetermined processing in accordance with the procedures recorded in the programs. The other parts are connected by internal buses 117 and 127, and control the whole part.

The ROMs 114 and 124 store processing procedures executed by the master microcomputer 110 and the slave microcomputer 120 as programs. RAM 115, 125
Is a memory for storing temporary storage data such as display signal data.

The internal buses 117 and 127 are connected to the CPU 11
3, 123 and other parts are connected, and CPUs 113, 12
And transmits necessary information to the CPU 11.
3, to 123.

The signal I / F 116 inputs a display signal,
The data is transmitted to the CPU 113 via the internal bus 117. The external I / F 126 transmits a signal input from outside such as a switch to the CPU 123 via the internal bus 127.

The operation of the display device having such a configuration for transition to and return from sleep will be described. Here, the cause of the transition to the sleep state on the master microcomputer 110 side is a case where the display signal is not input for a certain period, and the cause of the slave microcomputer 120 side is a case where the power key provided on the liquid crystal display unit 12 is pressed. The cause on the side of the master microcomputer 110 that returns from the sleep mode is when an interrupt signal for inputting a display signal is input, and the cause on the side of the slave microcomputer 120 is when the power key is pressed again. Of course, other factors can be set.

During normal operation, the CP of the master microcomputer 110
U113 monitors the presence or absence of a display signal input from the signal I / F 116 according to a program recorded in the ROM 114. In addition, information about whether or not a factor causing a transition to the sleep mode has occurred in the slave microcomputer 120 via the communication I / F 111 is collected at regular intervals. The CPU 123 of the slave microcomputer 120 has an external I / F 1
26, it is checked whether the power key has been pressed, and in response to an inquiry from the master microcomputer 110,
Transmits information on whether or not a factor for transition to sleep has occurred. CPU 113 of master microcomputer 110
Performs a transition process to sleep when a display signal is not input for a certain period of time or when information on occurrence of an event that a power key is pressed is acquired from the slave microcomputer 120. The procedure for transition to sleep will be described later.

When the master microcomputer 110 sleeps, the CP
U113 is in a sleep state. When an interrupt indicating that a display signal has been input via the signal I / F 116 is input, the CPU 1
13 returns from sleep and causes the slave microcomputer 120 to generate an interrupt signal via the interrupt I / F 112 as necessary. The CPU 12 of the slave microcomputer 120 to which an interrupt signal is input from the interrupt I / F 122
3 returns from sleep. Similarly, when the slave microcomputer 120 is in sleep mode and receives an interrupt indicating that the power key has been pressed via the external I / F 126, the CPU 123 returns from sleep mode, generates an interrupt signal to the master microcomputer 110, Signals return from sleep.

Next, a method for transitioning to sleep and a method for returning from sleep according to an embodiment of the present invention will be described. First, a method of transition to sleep will be described. The transition to the sleep mode includes a case where a factor occurs on the master microcomputer 110 side and a case where a factor occurs on the slave microcomputer 120 side.

The procedure for transition to sleep when a factor occurs on the master microcomputer 110 side will be described with reference to FIG. FIG.
FIG. 8 is a diagram showing a transition procedure when a factor causing a transition to sleep occurs in the master microcomputer.

The master microcomputer 110 notifies the slave microcomputer 120 of (1) sleep information when detecting the occurrence of a factor causing a transition to sleep, such as when no display signal is input for a certain period of time. The sleep information is a request for causing the slave microcomputer 120 to transition to sleep. The master microcomputer 110 subsequently transitions to (2) sleep. The slave microcomputer 120 that has acquired the sleep information via the communication line 131,
(3) After entering a sleep waiting state and after a certain period of time,
(4) Transition to sleep.

As described above, when a factor causing a transition to sleep occurs in the master microcomputer 110, a transition request is also transmitted to the slave microcomputer 120, so that both can transition to sleep. The transition to sleep recommends a procedure in which the slave microcomputer 120 transitions to sleep after the sleep transition of the master microcomputer 110 ends. In the present invention, since the slave microcomputer 120 is in a waiting state for a certain period after receiving a request, the slave microcomputer 120 can always be shifted to the sleep mode later.

Next, a procedure for transition to sleep when a factor occurs on the slave microcomputer 120 side will be described with reference to FIG. FIG. 4 is a diagram showing a transition procedure when a factor causing a transition to sleep occurs in the slave microcomputer.

The slave microcomputer 120 is connected to the liquid crystal display 1
(2) Detecting that the power key on the front is pressed, and in response to an inquiry from the master microcomputer 110, notifies (1) occurrence information that a factor for transition to sleep has occurred. The master microcomputer 110 is a slave microcomputer 120
When the slave microcomputer 120 detects that a factor causing a transition to sleep has occurred, the slave microcomputer 120 is notified of (2) sleep information. The master microcomputer 110 subsequently transitions to (3) sleep. The slave microcomputer 120 that has acquired the sleep information via the communication line 131,
(4) After entering a sleep waiting state and after a certain period of time,
(5) Transition to sleep.

As described above, the slave microcomputer 120
The occurrence of a factor causing a transition to sleep is notified to the master microcomputer 110, and transition to sleep is performed in accordance with the master microcomputer 110. Therefore, the slave microcomputer 120 can always transition to sleep later.

As described above, the master microcomputer 110
Alternatively, even if a factor causing a transition to sleep occurs in one of the slave microcomputers 120, the transition to sleep is performed in a coordinated manner, so that power consumption can be further reduced. As a result, low power consumption during standby can be achieved. Further, it is possible to always achieve the transition by the procedure in which the recommended master microcomputer 110 transitions to sleep and then the slave microcomputer 120 transitions to sleep. Further, such information transmission can be performed using the communication line 131 provided in advance.

Next, a method of returning from sleep will be described. As in the case of the transition from the sleep mode, there are a case where a factor occurs on the master microcomputer 110 side and a case where a factor occurs on the slave microcomputer 120 side.

A procedure for returning from sleep when a factor occurs on the master microcomputer 110 side will be described with reference to FIG. FIG. 5 is a diagram illustrating a return procedure when a factor for returning from sleep occurs in the master microcomputer.

In the sleep mode, a display signal is input to the master microcomputer 110, and a hardware interrupt indicating that the display signal has been input is input, and the master microcomputer 110 returns from (1) sleep. Subsequently, (2) communication is performed using the communication line 131, and the state of the slave microcomputer 120 is confirmed. From the slave microcomputer 120, (3) AC
When K (acknowledge) is received, the slave microcomputer 12
Since 0 is also in the normal state, the normal state is started and the processing is terminated. From the slave microcomputer 120, (4) NAK
If (negative response) is received, (5) a hardware interrupt is generated and the slave microcomputer 120 is notified of the return from sleep. The slave microcomputer 120 returns from sleep (6) in response to the interrupt signal.

This series of operations will be described with reference to a flowchart. FIG. 6 is a flowchart showing a return procedure when a factor for returning from sleep occurs in the master microcomputer.

The display signal is input to the master microcomputer 110, and a hardware interrupt occurs due to the input of the display signal (S11). In response to the hardware interrupt, the master microcomputer 110 returns from sleep (S12).
The master microcomputer 110 that has returned from sleep communicates with the slave microcomputer 120 for inquiry (S13). Check whether the response is ACK or NAK (S
14) If ACK is received, slave microcomputer 120
Determines that it is not a sleep and ends the return process (S
17). If the response is NAK, the slave microcomputer 12
0 generates a hardware interrupt (S1
5). The slave microcomputer 120 that has detected the hardware interrupt returns from sleep (S16), and ends the return process (S17).

As described above, when a factor that causes the master microcomputer 110 to return from sleep occurs, if the slave microcomputer 120 is sleeping, the slave microcomputer 120
Also, since the return request is transmitted using the interrupt signal, both can return from sleep. Further, since an interrupt is generated after the state of the slave microcomputer 120 is confirmed, there is no fear that an unnecessary interrupt signal is input to the slave microcomputer 120.

Next, a procedure for returning from sleep when a factor occurs on the slave microcomputer 120 side will be described with reference to FIG. FIG. 7 is a diagram illustrating a return procedure when a factor for returning from sleep occurs in the slave microcomputer.

In the sleep mode, a hardware interrupt indicating that the power key has been pressed is input to the slave microcomputer 120, and the slave microcomputer 120 returns from (1) sleep mode. Slave microcomputer 120 recovered from sleep
Monitors the communication line 131 and (2) checks the communication for a certain period. If there is communication during a certain period,
Master microcomputer 110 determines that it has returned from sleep and ends the return processing. If there has been no communication for a certain period, the master microcomputer 110 determines that it is in the sleep mode, and (3) generates a hardware interrupt. The master microcomputer 110 that has detected the hardware interrupt
(4) Return from sleep.

This series of operations will be described with reference to a flowchart. FIG. 8 is a flowchart showing a return procedure when a factor for returning from sleep occurs in the slave microcomputer.

The front power key is pressed (S21), and a hardware interrupt is generated in the slave microcomputer 120 indicating that the front power key is pressed (S22). In response to the hardware interrupt, the slave microcomputer 120 returns from sleep (S23). The slave microcomputer 120 that has returned from the sleep state checks whether the master microcomputer 110 is performing communication (S24). When the communication from the master microcomputer 110 is received, the master microcomputer 110 determines that the sleep mode is not set, and ends the return process (S28). It is checked whether or not a certain period of time without communication has elapsed (S25). If not, the flow returns to S24 to monitor the communication state. If the predetermined time has elapsed, the master microcomputer 110 determines that the computer is in the sleep state, and generates a hardware interrupt for the master microcomputer 110 (S26). The master microcomputer 110 that has detected the hardware interrupt returns from the sleep mode (S27) and ends the return process (S2).
8).

As described above, the slave microcomputer 120
It is possible to notify the master microcomputer 110 that a factor for returning from sleep has occurred, and to return the master microcomputer 110 from sleep.

As described above, the master microcomputer 110
Alternatively, even when a factor for returning from sleep occurs in one of the slave microcomputers 120, it is possible to cooperatively return from sleep. Since such information transmission can be performed by one interrupt signal line, it is not necessary to add complicated hardware.

Further, in the above description, the master microcomputer and the slave microcomputer correspond one-to-one, but the present invention can be applied to a case where a plurality of slave microcomputers exist for the master microcomputer.

[0051]

As described above, in the display device of the present invention, information is mutually transmitted using the communication line and the interrupt signal line, and the master processor or the slave processor switches to the low power consumption mode. When a factor occurs, both the master processing unit and the slave processing unit transition to the low power consumption mode according to the master processing unit. Even when a factor causing a return in the low power consumption mode occurs, information is mutually transmitted using the communication line and the interrupt signal line, and both the master processing unit and the slave processing unit return from the low power consumption mode.

As described above, regardless of which of the master processing unit and the slave processing unit causes a transition to the low power consumption mode or a factor for returning to the low power consumption mode, the master processing unit and the slave processing unit cooperate to reduce the low power consumption mode. Mode or return from the low power consumption mode. For this reason, the power consumption of the entire display device during standby can be further reduced.

In the transition and return method of the display apparatus to the low power consumption mode according to the present invention, the master processing unit normally causes the master processing unit or the slave processing unit to cause a transition to the low power consumption mode. When it is detected that the slave processing unit has performed the operation, the slave processing unit is requested to make a transition to the low power consumption mode, and the own processing unit also transits to the low power consumption mode. At the time of the low power consumption mode, when a factor causing a return in one of the processing units occurs, the processing unit returns from the low power consumption mode, and requests the other processing units to return.
Both the master processing unit and the slave processing unit return from the low power consumption mode.

As described above, regardless of which of the master processing unit and the slave processing unit causes a transition to the low power consumption mode or a return factor, the information is transmitted to the other processing unit. It is possible to cooperatively transition to the low power consumption mode or return from the low power consumption mode. As a result, it has become possible to further reduce the standby power consumption of the entire display device.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a display device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a display device according to an embodiment of the present invention.

FIG. 3 is a diagram showing a transition procedure when a factor causing a transition to sleep occurs in a master microcomputer.

FIG. 4 is a diagram illustrating a transition procedure when a factor causing a transition to sleep occurs in a slave microcomputer.

FIG. 5 is a diagram showing a return procedure when a factor for returning from sleep occurs in the master microcomputer.

FIG. 6 is a flowchart showing a return procedure when a factor for returning from sleep occurs in the master microcomputer.

FIG. 7 is a diagram illustrating a return procedure when a factor for returning from sleep occurs in the slave microcomputer.

FIG. 8 is a flowchart showing a return procedure when a factor for returning from sleep occurs in the slave microcomputer.

FIG. 9 is a schematic configuration diagram of a liquid crystal display device.

[Explanation of symbols]

11: control box, 12: liquid crystal display, 1
3 ... control line, 110 ... master microcomputer,
111: communication I / F, 112: interrupt I / F, 11
3 CPU, 114 ROM, 115 RAM, 1
16 ... signal I / F, 117 ... internal bus, 120 ... slave microcomputer, 121 ... communication I / F, 122 ... interrupt I / F, 123 ... CPU, 124 ...・ ROM, 12
5 RAM, 126 external I / F, 127 internal bus, 131 communication line, 132 interrupt signal line

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Goichi Uehara 6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo Sony EMCS Corporation F-term (reference) 5B011 EB09 LL11 5C082 AA34 BA29 BB02 BD02 CA76 CA81 CB01 DA22 DA73 DA86 MM02

Claims (9)

[Claims] 1. A display device comprising a plurality of processing units for executing a predetermined processing function, a communication unit for communicating with another processing unit in the display device, and an interrupt signal for the other processing unit. Interrupt processing means for generating and inputting an interrupt signal generated by the other processing unit, and generating a factor for transitioning to the low power consumption mode or returning from the low power consumption mode in the other processing unit. When the occurrence information is obtained via the communication means or the interrupt processing means, or when the cause of the transition or the cause of the return occurs in the own processing unit, the own processing unit is shifted to the low power consumption mode or the low power consumption mode. While returning from the power consumption mode, the other processing units are switched or returned to the low power consumption mode as necessary. A master processing unit having: a communication unit that communicates with the master processing unit; an interrupt signal generated by the master processing unit; and an interrupt signal to the master processing unit. Interrupt processing means for generating, and, when the transition factor or the return factor occurs, generating the generation information and transmitting the generated information to the master processing unit using the communication means or the interrupt processing means; Control means for transitioning the self-processing unit to the low power consumption mode or returning from the low power consumption mode in response to a request from the unit, and for returning from the power consumption mode based on occurrence of the factor for returning if necessary. And a slave processing unit having the following. 2. The display device according to claim 1, wherein the low power consumption mode is a mode in which the operations of the master processing unit and the slave processing unit are temporarily stopped and a sleep state is set. 3. The control unit of the master processing unit queries the other processing unit at a predetermined interval via the communication unit as to whether a factor for transition to the low power consumption mode has occurred. The display device according to claim 1, wherein 4. The control means of the slave processing unit, when receiving a request to transition to the low power consumption mode from the master processing unit, transitions to the low power consumption mode after a predetermined period has elapsed. The display device according to claim 1. 5. The control unit of the master processing unit, when a factor for returning from the low power consumption mode occurs in the own processing unit in the low power consumption mode, returning from the low power consumption mode and the slave unit. 2. The display device according to claim 1, wherein when the processing unit is in the low power consumption mode, the interrupt processing unit generates an interrupt signal to the slave processing unit. 6. The control unit of the master processing unit inquires of the slave processing unit using the communication unit, and when a response is not returned or the response is a negative response, the slave processing unit 6. The display device according to claim 5, wherein the display device determines that the mode is the power consumption mode and generates the interrupt signal. 7. A control unit of the slave processing unit, when a factor for returning from the low power consumption mode occurs in the self processing unit in the low power consumption mode, returning from the low power consumption mode and the master unit. 2. The display device according to claim 1, wherein when the processing unit is in the low power consumption mode, the interrupt processing unit generates an interrupt signal to the master processing unit. 8. The control unit of the slave processing unit monitors an input from the communication unit for a predetermined time, and determines that the master processing unit is in the low power consumption mode when there is no input for a predetermined time, The display device according to claim 7, wherein the interrupt signal is generated. 9. A method for transitioning and returning to a low power consumption mode of a display device comprising a plurality of processing units for executing a predetermined processing function, comprising: communication means for exchanging predetermined information data; And a interrupt processing means for inputting an interrupt signal generated by the other party, and a master processing unit and a slave processing unit, when the master processing unit and the slave processing unit are in the low power consumption mode in a normal state. Detecting whether or not a factor causing a transition has occurred, and collecting the information on whether or not the factor causing the transition has occurred in the slave processing unit using the communication unit with the master processing unit,
When the master processing unit detects that the cause of the transition has occurred in its own processing unit, or when the master processing unit detects that the cause of the transition has occurred in the slave processing unit based on collected information, the slave processing is performed. Requesting the unit to transition to the low power consumption mode using the communication unit, and causing the own processing unit to transition to the low power consumption mode; and in response to the request, the slave processing unit A step of transitioning to the low power consumption mode, comprising: a step of transitioning to the low power consumption mode; and a step in which the master processing unit or the slave processing unit returns from the low power consumption mode during the low power consumption mode. If detected, returning the own processing unit from the low power consumption mode, and checking the state of another processing unit using the communication unit Requesting the other processing unit to return from the low power consumption mode to the other processing unit using the interrupt processing unit when the other processing unit is in the low power consumption mode; and A processing unit that receives the request returns the processing unit from the low power consumption mode in response to the request; and a procedure for returning from the low power consumption mode. Transition and return method to low power consumption mode.