TWI668564B - Display controller and power saving method thereof - Google Patents

Abstract

The energy saving method of the display controller includes: turning on the input signal detecting unit in the display controller to detect the first presence of the at least one input signal input to the display controller; when the input signal detecting unit cannot be in the first time length Receiving at least one input signal, the operating power of the display controller is reduced from the first power to the second power for a second time length; after the second time length, the input signal detecting unit continues to detect the at least one input The second presence of the signal; and adjusting the operational mode of the display controller in accordance with the second presence of the at least one input signal. The second power is less than the first power.

Description

Display controller and its energy saving method

The present invention describes a display controller and an energy saving method thereof, and more particularly, an energy saving method in which a display controller operates in a standby state.

With the rapid development of technology and the rise of environmental awareness, many international environmental protection agencies have defined some standards for reducing energy consumption for display products, hoping to achieve energy saving and carbon saving. Moreover, in recent years, as the international use of energy has become more and more important, the standards for reducing the demand for energy consumption of displays have become stricter. Generally, the operation modes of the display are classified into three types, which are an on mode, an off mode, and a standby mode. When the display is in the on mode, since the display's power switch is on, all functions can be driven, so the power consumption is the highest. When the monitor is in the off mode, the power consumption is lowest because the monitor's power switch is off to disable all functions. When the display is in standby mode, it only needs to maintain the function of detecting whether the input signal source is restored, so the power consumption is medium.

Although the conventional display has a standby mode and corresponds to a medium power consumption. However, in the standby mode of conventional displays, power consumption is not optimized. This will result in a traditional display countermeasure strategy for the low power consumption display controller in standby mode under the increasingly stringent energy consumption requirements. In other words, if the display controller of the display still has a small amount of power consumption in standby mode and cannot meet strict energy consumption standards, the display will be forced to be limited only in areas where there is no energy consumption, or It is sold in areas where energy consumption regulations are more relaxed.

An embodiment of the present invention provides an energy saving method for a display controller, comprising: turning on an input signal detecting unit in a display controller to detect a first presence of at least one input signal input to a display controller, when inputting a signal signal When the measuring unit is unable to receive at least one input signal within the first time length, the operating power of the display controller is reduced from the first power to the second power in the second time length; after the second time length, the input signal is detected. The unit continues to detect the second presence of the at least one input signal and adjusts the operational mode of the display controller in accordance with the second presence of the at least one input signal. The second power is less than the first power.

Another embodiment of the present invention provides a display controller including a power control unit, a first switch, an input signal detecting unit, and a processor. The power control unit is configured to provide a plurality of driving voltages. The first switch includes a first end, a control end, and a second end coupled to the power control unit. The input signal detecting unit is coupled to the second end of the first switch. The processor is coupled to the power control unit, the input signal detecting unit and the control end of the first switch for controlling the power control unit, the input signal detecting unit and the first switch. The processor turns on the input signal detecting unit and turns on the first switch, so that the input signal detecting unit detects the first presence of the at least one input signal by using the driving voltage provided by the power control unit, when at least one input signal cannot be in the first When received by the input signal detecting unit for a certain length of time, the processor turns off the first switch, so that the operating power is reduced from the first power to the second power in the second time length, and after the second time length, the processor re- Turning on the first switch, so that the input signal detecting unit continues to detect the second presence of the at least one input signal, and according to the second existence of the at least one input signal, the processor adjusts the operation mode of the display controller, and The second power is less than the first power.

100‧‧‧ display controller

10‧‧‧Power Control Unit

11‧‧‧Input signal detection unit

12‧‧‧ Processor

13‧‧‧Control unit

SW1‧‧‧ first switch

SW2‧‧‧second switch

P1 to PN‧‧‧connector

S201 to S205‧‧‧ steps

S301 to S306‧‧‧ steps

Steps S401 to S409‧‧

Figure 1 is a block diagram of an embodiment of a display controller of the present invention.

Fig. 2 is a flow chart showing the execution of the energy saving method in the display controller of Fig. 1.

Figure 3 is a flow diagram of an embodiment of a display controller of Figure 1 for performing an energy saving method under a single port.

Figure 4 is a flow diagram of an embodiment of the display controller of Figure 1 for performing an energy saving method under a plurality of ports.

1 is a block diagram of an embodiment of a display controller 100 of the present invention. The display controller 100 can be a Scaler IC Controller inside the display. The display controller 100 can embed circuit components on the wafer in an integrated manner. The display controller 100 includes a power control unit 10, a first switch SW1, an input signal detecting unit 11, and a processor 12. The power control unit 10 is configured to provide a plurality of driving voltages to different circuit elements within the display controller 100. The first switch SW1 includes a first end, a control end, and a second end coupled to the power control unit 10. The first switch SW1 can be any form of switch, such as a transistor switch. The input signal detecting unit 11 is coupled to the second end of the first switch SW1. The processor 12 is coupled to the power control unit 10, the input signal detecting unit 11, and the control end of the first switch SW1 for controlling the power control unit 10, the input signal detecting unit 11, and the first switch SW1. Processor 12 can be any form of processing element, such as a programmable logic unit or a microprocessor or the like. The processor 12 can have the function of a counter or a function of connecting a metric. Alternatively, processor 12 may embed a counter circuit and circuitry coupled to the 埠 indicator, the function of processor 12 being described in more detail below. The display controller 100 may also include a control unit 13 and at least one port 1P1 to PN. The control unit 13 is coupled to the processor 12 and coupled to the power control unit 10 via the second switch SW2 for setting at least one display parameter. For example, the control unit 13 can be an input/output unit (I/O Unit), a memory switching unit, or an on-screen display function (On-Screen Display Function). Control unit. The at least one port 1P1 to PN can be a signal transmission port of any video signal format and coupled to the input signal detecting unit 11. For example, the port 1P1 can be a port corresponding to a video graphics Array (VGA) format, and the port 2P2 can be a port corresponding to a high definition multimedia interface (HDMI) format, and a port 埠P3 It can be a port corresponding to the Digital Display Interface (DP) format. N is a positive integer. When N is 1, it means that the display controller 100 only contains a single port (P1), so only a single video signal format is supported. When N is greater than 1, it indicates that the display controller 100 includes a plurality of ports, so that a plurality of video signal formats can be supported. Also, the circuit elements inside the display controller 100 are not limited by the above embodiments, for example, the display controller 100 may include additional circuit elements to increase the function of the display controller 100. The display controller 100 can also be integrated into the display device. Any reasonable hardware changes are within the scope of the present invention.

In the display controller 100, the processor 12 can turn on the input signal detecting unit 11 and turn on the first switch SW1, so that the input signal detecting unit 11 detects at least one input signal by using the driving voltage provided by the power control unit 10. First existence. In practice, the input signal detecting unit 11 can be driven by a driving voltage provided by the power control unit 10, and the driving voltage includes a power supply voltage (Vcc) for driving the power control unit 10 for detecting and comparing, for example, a circuit. Ground voltage (V _GND ) and so on. When the at least one input signal cannot be received by the input signal detecting unit 11 for the first time length, the processor turns off the first switch SW1, so that the operating power of the display controller 100 is decreased by the first power for the second time length. For the second power. Moreover, after the second time length, the processor 12 will turn on the first switch SW1 to enable the input signal detecting unit 11 to continuously detect the second presence of the at least one input signal. Processor 12 then adjusts the mode of operation of display controller 100 in accordance with the second presence of at least one input signal. Here, the second power is less than the first power. It should be understood that, in the foregoing embodiment, the processor 12 can achieve the purpose of saving power consumption by temporarily turning off the power of the signal detecting unit 11 (for example, turning off the first switch SW1). However, the processor 12 can also achieve the purpose of saving power consumption by temporarily turning off the power of the control unit 13 (for example, turning off the second switch SW2). In addition, the processor 12 can also achieve the purpose of saving power consumption by temporarily turning off the power of the signal detecting unit 11 and the control unit 13 (for example, turning off the first switch SW1 and the second switch SW2). Any reason to achieve a power saving by reasonably closing the non-essential circuit components is within the scope of the present invention. The flow of the display controller 100 executing the energy saving method is described below.

Fig. 2 is a flow chart showing the execution of the energy saving method in the controller 100. The flow of the execution of the energy saving method of the display controller 100 shown in FIG. 2 is a generalized flow. The flowcharts shown in FIG. 3 and FIG. 4 are flowcharts showing a specific embodiment in which the display controller 100 performs an energy saving method in hardware or software under different hardware specifications. However, in order to allow a person having general knowledge to understand the method of performing energy saving of the display controller 100 from a shallower perspective, the following is a description of the general flow of FIG. 2, and then FIG. 3 and Figure 4 illustrates the specific implementation details. The flow of the execution energy saving method of the display controller 100 shown in Fig. 2 includes steps S201 to S205 as follows. Step S201: The input signal detecting unit 11 is turned on to detect the first presence of the at least one input signal input to the display controller 100. Step S202: The input signal detecting unit 11 receives at least one of the first time lengths. Input signal? If yes, go back to step S201; if not, go to step S202; step S203: reduce the operating power of the display controller 100 from the first power to the second power in the second time length; step S204: after the second time length The input signal detecting unit 11 continues to detect the second presence of the at least one input signal; and in step S205, the operating mode of the display controller 100 is adjusted according to the second presence of the at least one input signal.

In step S201, the display controller 100 turns on the input signal detecting unit 11 to detect the first presence of the at least one input signal input to the display controller 100. For example, the processor 12 in the display controller 100 can first turn on the first switch SW1 to enable the input signal detecting unit 11 to utilize the power control. The driving voltage provided by the unit 10 is enabled. When the input signal detecting unit 11 is enabled, the input signal detecting unit 11 can detect the presence of at least one input signal input to one or more of the ports 1 P1 to PN of the display controller 100 at any time. In step S202, the input signal detecting unit 11 determines whether to receive at least one input signal within the first time length. For example, the input signal detecting unit 11 detects whether the connection port P1 receives the input signal within the length of two frames. Alternatively, the input signal detecting unit 11 can further detect whether the frequency and/or voltage of the signal received by the port P1 is stable for the first time length. In other words, the implementation of step S202 may be that the input signal detecting unit 11 detects only the presence of at least one input signal received by the at least one port within the first time length, or further detects at least one input. Signal stability. Any reasonable technical changes are within the scope of the present invention. If at least one input signal exists (or exists and is stable) for the first time length, indicating that the display controller 100 is operating normally, the video signal can be processed normally, so the display controller 100 returns to step S201 and continues to detect at any time. Measure at least one input signal. If at least one input signal does not exist (or is unstable) within the first time length, it indicates that the display controller 100 cannot process the input video and audio message normally, so the display controller 100 proceeds to step S203. In step S203, the operating power of the display controller 100 will be reduced from the first power to the second power for the second time length. For example, when at least one input signal cannot be received by the input signal detecting unit 11 (for example, 2 Frames) (or is very unstable), the processor 12 may turn off the first switch SW1. After the processor 12 turns off the first switch SW1, the signal detecting unit 11 is in a disabled state, so the operating power of the display controller 100 is reduced from the first power to the second power (lower) in the second time length. However, display controller 100 can reduce its operating power in any manner. For example, the processor 12 can simultaneously turn off the first switch SW1 and the second switch SW2 to disable the control unit 13 and the signal detecting unit 11 at the same time. Alternatively, processor 12 may only turn off second switch SW2, causing control unit 13 to be disabled. Alternatively, processor 12 may control display controller 100 to temporarily enter a Power Off mode to increase the level of power savings. In step S204, after the second time length, the input signal detecting unit 11 can continue to detect the second of the at least one input signal. Existence. For example, after the second time length, the processor 12 turns on the first switch SW1 again, so that the input signal detecting unit 11 is again enabled by the driving voltage provided by the power control unit 10. Subsequently, the input signal detecting unit 11 can continue to detect the second presence of the at least one input signal. In step S205, the processor 12 may adjust the operation mode of the display controller 100 according to the second presence of the at least one input signal. For example, processor 12 may re-enter display controller 100 into a power off mode or enter a power save mode under a portion of the circuit components. As mentioned above, the display controller 100 can support a single port 埠P1 or a plurality of ports 例如 (eg, ports 1P1 to PN). Therefore, the flow of the above-described display controller 100 performing the energy saving method can also be adjusted for the specification of a single port or a plurality of ports, the details of which will be described later.

Figure 3 is a flow diagram of an embodiment of the display controller 100 that performs an energy saving method under a single port. The execution of the power saving method by the display controller 100 under a single connection includes steps S301 to S306. The code for a single connection here is the port 1P1 in Figure 1. Any reasonable technical changes are within the scope of the present invention. Steps S301 to S306 are described below. Step S301: The display controller 100 starts the control energy saving main loop program; Step S302: Does the input signal detecting unit 11 receive at least one input signal within the first time length? If yes, go back to step S301; if not, go to step S303; step S303: turn off the input signal detecting unit 11 or other power-consuming control unit in the display controller 100, so that the power consumption of the display controller 100 is turned off. Decrease and maintain for 15 seconds; Step S304: Turn on the input signal detecting unit 11 and other power-consuming control units in the display controller 100 to cause the display controller 100 to reply to the state of detecting the input signal at any time; Step S305 Is the input signal detecting unit 11 receiving at least one input signal within the first time length? If yes, go to step S306; if no, go back to step S303; Step S306: All functions of the display controller 100 are activated.

In step S301, the display controller 100 starts the control of the energy saving main loop program. For example, the display controller 100 can turn on the input signal detecting unit 11 to periodically detect whether the control unit 13 is triggered (for example, whether the output/output button is pressed), and detect whether at least one input signal exists at any time (or Exist and stable).

In step S302, the input signal detecting unit 11 determines whether at least one input signal is received within the first time length (for example, 2 Frames). For example, the input signal detecting unit 11 determines whether at least one input signal exists according to the voltage and/or frequency of the at least one input signal received by the connection port P1 within a first time length, preferably, when present, preferably Further judge its stability.

If the input signal detecting unit 11 cannot stably receive the at least one input signal through the connection port P1 for the first time, the processor 12 can turn off the input signal detecting unit 11 or other in the display controller 100 according to step S303. A unit that consumes a higher amount of power, such as the control unit 13, reduces the power consumption of the display controller 100 and maintains a second length of time (e.g., for 15 seconds). In other words, within 15 seconds, display controller 100 operates in a power save mode and is driven at a lower second power. If the input signal detecting unit 11 can stably receive the at least one input signal through the connection port P1 within the first time length, the process returns to step S301 to continue detecting the at least one input signal. However, the display controller 100 of the present invention is not necessarily limited to the 15-second power saving mode. The display controller 100 can also enter a power off mode or enter a power save mode of any length of time. Any reasonable manner of energy saving and technical changes are within the scope of the present invention.

After the 15 second power saving mode, according to step S304, the processor 12 turns on the input signal detecting unit 11 in the display controller 100 and other units with higher power consumption, such as the control unit 13, to cause the display controller 100 to reply. The status of the input signal is detected at any time.

Since the signal detecting unit 11 has returned to normal operation, the signal detecting unit 11 can determine, at one time, whether to receive at least one of the first time length (for example, 2 Frames) according to step S305. Input signals? For example, the signal detecting unit 11 determines, once the first time length, whether at least one input signal exists according to the voltage and/or frequency of the at least one input signal received by the port P1, preferably, in its presence. When it is further judged its stability. If the voltage and/or frequency of the at least one input signal received by the port P1 is still absent or unstable, then returning to step S303, the processor 12 turns off the input signal detecting unit 11 or other power consumption in the display controller 100. High control unit for 15 seconds. If the input signal detecting unit 11 can stably receive at least one input signal (voltage and/or frequency) through the connection port P1 for the first time length, according to step S306, the display controller 100 can start all functions to recover. Into a normal working procedure.

It can be understood from step S301 to step S306 that in the embodiment of the display controller 100 in the single port 埠P1, when at least one input signal cannot be stably received by the input signal detecting unit 11, the display controller 100 is periodically turned on. And the input signal detecting unit 11 and other units with higher power consumption, such as the control unit 13, are turned off. Therefore, since the input signal detecting unit 11 is periodically turned on and off, the average power consumption of the display controller 100 will be reduced, thereby achieving the effect of optimizing energy saving.

Figure 4 is a flow diagram showing an embodiment of the display controller 100 for performing an energy saving method under a plurality of ports 1P1 to PN. The method for performing power saving of the display controller 100 under a plurality of ports 1P1 to PN includes steps S401 to S409. Any reasonable technical changes are within the scope of the present invention. Steps S401 to S409 are described below. Step S401: The display controller 100 starts the control energy saving main loop program; Step S402: Does the input signal detecting unit 11 receive at least one input signal within the first time length? If yes, go back to step S401; or no, go to step S403; step S403: turn off the input signal detecting unit 11 or other power-consuming control unit in the display controller 100, so that the power consumption of the display controller 100 is turned off. Lowering and maintaining for 20 seconds; step S404: setting the counter value to the number of the ports 1P1 to PN, and connecting 埠 The indicator points to the port that matches the input signal format; step S405: Is the counter value zero? If yes, go back to step S403; if no, go to step S406; step S406: turn on the input signal detecting unit 11 and other power-consuming control units in the display controller 100, so that the display controller 100 can reply to the detection input at any time. Status of the signal; Step S407: Is at least one input signal stable? If yes, go to step S408; if no, go to step S409; step S408: start all functions of the display controller 100; step S409: decrease the counter value, update the port index, and return to step S404.

In step S401, the display controller 100 starts a control energy saving main loop program. For example, the display controller 100 can turn on the input signal detecting unit 11 to periodically detect whether the output/output button is pressed, and to detect whether at least one input signal exists (or exists and is stable) at any time. Moreover, the user can set the input signal format of the display controller, for example, set the input signal format to a video graphics array (VGA) format. Therefore, the display controller 100 can scan the ports corresponding to different formats to confirm whether an input signal of a preset format is received. For example, the port 1P1 corresponds to an input signal of the video graphics array format. The connection port 2P2 corresponds to the input signal of the High Definition Multimedia Interface (HDMI) format. The input signal corresponding to the digital video interface standard (DP) format is connected to the P3. The display controller 100 can scan a plurality of ports 1P1 to P3, wherein at least one of the input signals conforms to an input signal format (eg, VGA format) and is transmitted to one of the ports 例如P1 to P3 (eg, P1). In step S402, the input signal detecting unit 11 determines whether at least one input signal is received within a first time length (for example, 2 Frames). For example, the input signal detecting unit 11 determines whether at least one input signal exists according to the voltage and/or frequency of the at least one input signal received by the connection port P1 corresponding to the VGA format within a first time length, and further determines whether at least one input signal exists, and further Determine its stability. If the input signal detecting unit 11 is within the first time length The at least one input signal cannot be stably received through the connection 埠P1 corresponding to the VGA format, and the processor 12 can turn off the input signal detecting unit 11 or other control unit with higher power consumption in the display controller 100 according to step S403. The power consumption of the display controller 100 is lowered and the second time length is maintained for about 20 seconds. In other words, within 20 seconds, display controller 100 will operate in a power save mode and be driven at a lower second power. If the input signal detecting unit 11 can stably receive the at least one input signal through the corresponding VGA format connection port P1 for the first time, the process returns to step S401 to continue to detect the at least one input signal. However, the display controller 100 of the present invention is not necessarily limited to the 20 second power saving mode. The display controller 100 can also enter a power off mode or enter a power save mode of any length of time. Any reasonable manner of energy saving and technical changes are within the scope of the present invention. After the 20 second power saving mode, according to step S404, the processor 12 (or an independent counter) in the display controller 100 sets the counter value to the number of the ports P1 to PN, and points the port indicator to A port that matches the input signal format. For example, consider the input signal connected to VGAP1 corresponding to VGA format, the input signal connected to HDMIP2 corresponding to HDMI format, and the input signal corresponding to DP format corresponding to P3, the counter value can be set to 3, and the connection 埠 indicator*1 It can be expressed as a connection 埠P1 corresponding to the VGA format, and a connection 埠 indicator*2 can be expressed as a connection 埠P2 corresponding to the HDMI format, and a connection 埠 indicator*3 can be represented as a connection 埠P3 corresponding to the DP format. Then, according to step S405, the display controller 100 detects whether the counter value is zero. If the counter value is zero, it means that the scan loop described later has been executed 3 times. In the case that all the ports are scanned, the display controller 100 returns to step S403 to turn off the display controller 100 again. The input signal detecting unit 11 or other control unit with higher power consumption is 20 seconds. If the counter value is not zero, for example, in the first scan (counter value=3), according to step S406, the processor 12 can turn on the input signal detecting unit 11 in the display controller 100 and other high power consumption. The control unit is configured to cause the display controller 100 to reply to the state of detecting the input signal at any time. Then, according to step S407, the input signal detecting unit 11 detects, via the port 埠 indicator*1, the connected port (for example, the port 1 corresponding to the VGA format) in the first time length to determine whether the at least one input can be stably received. News number. If the input signal detecting unit 11 can stably receive at least one input signal through the connection port P1 pointed to by the connection indicator*1 within the first time length (or a relatively loose judgment condition can be used to detect at least one input signal) Existence), then all functions of the display controller 100 can be initiated in accordance with step S408. If the input signal detecting unit 11 cannot stably receive at least one input signal through the connection pointed to by the connection indicator *1 for the first time length (or may use a relatively loose judgment condition to detect the presence of at least one input signal) The display controller 100 may reduce the value of the counter (for example, from 3 to 2) according to step S409, and update the connection indicator (for example, updated by the connection indicator *1 to the connection indicator *2) to Make the updated port 埠 indicator *2 point to the other port in the port. Therefore, when the next loop is returned to step S405, the detected port is the port 2P2 corresponding to the HDMI format pointed to by the port indicator*2. It can be understood from step S401 to step S409 that in the embodiment in which the display controller 10 is connected to the plurality of ports P1 to PN, the scanning program of the plurality of ports is performed (the scanning of steps S405, S406, S407, and S409) Circle), if none of the plurality of ports can stably receive the input signal of the corresponding image format, the display controller 100 periodically turns the input signal detecting unit 11 on and off. During the execution of the scan loop, if the input signal detecting unit 11 can receive at least one input signal through a certain port, the scan loop can be jumped out, and the processor 12 can activate all functions of the display controller 100 (corresponding steps) S408). Therefore, since the input signal detecting unit 11 is periodically turned on and off, the average power consumption of the display controller 100 will be reduced, thereby achieving the effect of optimizing energy saving.

In summary, the present invention describes an energy saving method for a display controller that can be applied to a single port or a plurality of display controllers. In the case where the display controller is a single port, the display controller can utilize periodic switching on and off of some circuit components to reduce the average power consumption. In the specification that the display controller is a plurality of ports, the display controller can use the parameters of the port and the counter value to perform scanning back, in addition to periodically turning on and off some circuit components to reduce the average power consumption. Circle, used to detect the switch. therefore, The display controller can detect the status of the input signals received by all of its supported connections. Therefore, the energy saving method of the display controller of the present invention can support hardware specifications of single or multiple ports. Also, in the standby mode, since the operating power can be periodically reduced, the average power consumption can also be reduced. Therefore, the energy saving method of the display controller of the present invention is very suitable for use in hardware specifications of increasingly stringent energy consumption requirements in the future.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

Claims (12)

An energy saving method for a display controller, comprising: turning on an input signal detecting unit in a display controller to detect a first presence of at least one input signal input to the display controller; and when the input signal is detected When the measuring unit is unable to receive the at least one input signal within a first time period, the display controller temporarily enters a power-off mode, so that an operating power of the display controller is controlled by a first time length The power is reduced to a second power; after the second time length, the input signal detecting unit continues to detect a second presence of the at least one input signal; and the second according to the at least one input signal Existence, adjusting an operation mode of the display controller; wherein the second power is less than the first power, and the second power is a power consumption corresponding to the display controller entering the power off mode. The method of claim 1, wherein the adjusting the operating mode of the display controller according to the second presence of the at least one input signal comprises: if the input signal detecting unit fails to pass through the first time length Receiving the at least one input signal, disconnecting the input signal detecting unit and/or the control unit for setting the at least one display parameter for the second time length, or causing the display controller to temporarily enter the The power-off mode; or if the input signal detecting unit receives the at least one input signal through a port within the first time length, substantially all functions of the display controller are activated. The method of claim 1, further comprising: after the input signal detecting unit detects the first presence of the at least one input signal, further Detecting a first stability of the at least one input signal; and/or detecting the at least one input signal after the input signal detecting unit detects the second presence of the at least one input signal A second stability. The method of claim 1, wherein detecting the first presence or the second presence of the at least one input signal comprises: turning the input signal detection unit on the first time length to detect the at least Whether a frequency and/or a voltage of an input signal is received by the input signal detecting unit within the first time length. The method of claim 1, further comprising: setting an input signal format of the display controller, wherein the input signal format comprises a video graphics array (VGA) format, and a high-definition multimedia interface (High) One of the Definition Multimedia Interface (HDMI) format and one of the Digital Display Interface (DP) formats, and the display controller further includes a plurality of ports for transmission to one of the ports 埠The at least one input signal conforms to the input signal format; a counter value is set to the number of the ports; and a port indicator is directed to the port that conforms to the input signal format; wherein the at least one input signal is The second mode of operation, the adjusting the operation mode of the display controller includes: if the input signal detecting unit receives the at least one input signal through the port pointed to by the port indicator during the first time length, In essence, all functions of the display controller are activated; if the input signal detecting unit cannot pass the connection for the first time length Port index indicator points to the port after the port receiving the at least one input signal, to reduce the counter value and updates the port index, so that is updated to point to another port in the plurality of even Receiving, and if the other connection receives the at least one input signal within the first length of time, substantially initiating all functions of the display controller; and if the other connection is within the first length of time Receiving the at least one input signal and the counter value is zero, the input signal detecting unit and/or a control unit for setting at least one display parameter is disabled for the second time length, or the display controller is temporarily disabled Enter the power off mode. The method of claim 1, wherein the input signal detecting unit continues to detect a second presence of the at least one input signal: the input signal detecting unit sequentially scans the plurality of ports; Adjusting the operation mode of the display controller includes: if at least one of the ports receives the at least one input signal, maintaining the operating power of the display controller The first power; and if the ports are unable to receive the at least one input signal, reducing the operating power of the display controller from the first power to the second power. A display controller includes: a first switch, a first end, a control end, and a second end; a power control unit coupled to the first end of the first switch for providing a plurality of a driving voltage; an input signal detecting unit coupled to the second end of the first switch; and a processor coupled to the power control unit, the input signal detecting unit, and the control of the first switch And the first switch is configured to control the power control unit, the input signal detecting unit, and the first switch; wherein the processor turns on the input signal detecting unit and turns on the first switch to enable the input signal to detect Using a driving voltage provided by the power control unit to detect a first presence of the at least one input signal, when the at least one input signal cannot be received by the input signal detecting unit within a first time period, The processor turns off the first switch, so that the display controller temporarily enters a power-off mode, and an operating power of the display controller is reduced from a first power to a second power in a second time length. The second power is the power consumption corresponding to the display controller entering the power off mode. After the second time length, the processor turns the first switch back on, so that the input signal detecting unit continues to detect The second presence of the at least one input signal, and the second presence of the at least one input signal, the processor adjusts an operational mode of the display controller, and the second power is less than the first power. The display controller of claim 7, wherein the processor turns the input signal detecting unit on the first time length to detect a frequency of the at least one input signal and/or a voltage at the first time Whether the length is received by the input signal detecting unit. The display controller of claim 8, wherein the processor substantially activates all functions of the display controller if the input signal detecting unit receives the at least one input signal through a port within the first time length . The display controller of claim 7, further comprising: a control unit coupled to the processor and coupled to the power control unit via a second switch for setting at least one display parameter; wherein the at least one The display parameter includes an input signal format including a video graphics array (VGA) format, a high definition multimedia interface (HDMI) format, and a digital video interface standard. One of the (Display Port, DP) formats, and the display controller further includes a plurality of ports, and the at least one input signal transmitted to one of the ports corresponds to the input signal format; The processor includes a counter and a port indicator, wherein the counter value is set to the number of the ports, and the port is used to point to the port that matches the input signal format, if the input signal is detected Receiving, by the unit, the at least one input signal through the port pointed to by the port indicator during the first time length, the processor substantially starting all functions of the display controller, if the input signal detecting unit is in the The at least one input signal cannot be received through the port pointed to by the port indicator within a certain length of time, the counter reduces the counter value, and the processor updates the port indicator to cause the updated port indicator to point The other port of the port, and if the other port receives the at least one input signal within the first length of time, the The processor essentially activates all of the functions of the display controller. The display controller of claim 7, wherein the input signal detecting unit sequentially scans a plurality of ports coupled to the input signal detecting unit, and if at least one of the ports receives the at least one The processor maintains the operating power of the display controller at the first power when an input signal is received, and the operating power of the display controller of the display controller if the ports are unable to receive the at least one input signal From the first power to the second power. The display controller of any one of claims 7 to 11, wherein the display controller is integrated in a display device.