TWI511119B - Method for fast power-on of lcd tv - Google Patents

Description

LCD TV quick start method

The invention relates to a quick start method, and in particular to a quick start method of a liquid crystal display television (LCD TV).

1 and 2 are respectively a system architecture diagram of a conventional liquid crystal television and a flowchart thereof. Referring to FIG. 1 , the existing LCD TV includes a power board 1 , a main board 2 , and a display panel 3 . The power supply board 1 is provided with a power supply, and the power supply includes an electromagnetic interference filter 11, a bridge rectifier 12, a power factor corrector 13, a main power converter 14, a standby power converter 15, and a power supply switch 16. The main board 2 is provided with a microcontroller unit (MCU) 21, a remote control circuit 22, an image interface circuit 23, an image processor 24, and a photo sensor 25. The display panel 3 is provided with a timing controller 31, a liquid crystal panel 32, a backlight driving circuit 33, and a backlight module 34. The electrical coupling relationship between the components, the solid line with an arrow indicates the power supply coupling relationship and its power transmission direction, and the dotted line with the arrow indicates the signal or data coupling relationship and its signal or data transmission direction. .

Referring to FIG. 1 and FIG. 2 simultaneously, after the AC power input (step S11), the AC power source suppresses the conductive noise through the electromagnetic interference filter 11, and is rectified by the bridge rectifier 12, and directly input through the power factor corrector 13 The standby power converter 15 is converted into the standby power source Vsb and the internal power source Vcc by the standby power converter 15, and the internal power source Vcc cannot pass the power supply switch. 16 is transmitted to provide the controller power supply in the power factor corrector 13 and the main power converter 14, so that the main power converter 14 does not output the main power sources Vm1 and Vm2, and the liquid crystal television is in the standby mode without screen display. When the LCD TV is in the standby mode, the power supply only outputs the standby power Vsb to provide power to the MCU 21 and the remote control circuit 22 (step S12), and the remote control circuit 22 is configured to receive an external command issued by the user pressing a button on the remote controller and The external command is transmitted to the MCU 21, and the MCU 21 judges whether or not the external command is turned on (step S13). If it is determined that the external command is not turned on, the MCU 21 regards the external command as invalid, and the LCD TV continues to be in the standby mode.

If it is determined that the external command is turned on, the MCU 21 will control the LCD TV to enter the normal working mode. At this time, the MCU 21 first outputs the power start signal PS_ON (step S14) to control the power switch 16 to transmit the internal power source Vcc to provide the power factor. The corrector 13 and the controller power supply in the main power converter 14 start the main power converters 14 to output the main power sources Vm1 and Vm2 to supply all other component power sources (step S15). The main power source Vm1 is used to provide the image interface circuit 23, the image processor 24, the light sensor 25, the timing controller 31, and the liquid crystal panel 32, so that the image interface circuit 23 starts receiving, for example, a wireless or cable television program or a video player. After the video or the like is input, the image processor 24 starts to demodulate, decode, or scale the input video received by the image interface circuit 23, and outputs the result to the timing controller 31, and then the timing controller 31 controls the liquid crystal panel 32 to display the corresponding screen. (Step S16). The main power source Vm2 is used to supply the backlight driver circuit 33 to input power, and the backlight driver circuit 33 converts the input power into a high voltage power source to drive the backlight module 34 to provide backlight (step S17), so that the user can see the screen displayed by the liquid crystal panel 32.

When the LCD TV is in the normal working mode, the power supply still outputs the standby power Vsb to provide the power of the MCU 21 and the remote control circuit 22, and the remote control circuit 22 continues to receive the external command issued by the user pressing the button on the remote controller and transmits the external command. To MCU 21, by MCU 21 determines an external command for whether the external command is turned off (step S18). If it is determined that the external command is not turned off, the MCU 21 performs a corresponding control action according to the external command, and the LCD TV continues to be in the normal operation mode and has a screen display. If it is determined that it is an external command to turn off, the MCU 21 will control the liquid crystal television to return to the standby mode (step S12). In addition, when the LCD TV is in the normal working mode, the light sensor 25 can detect the ambient light and transmit the detection result to the MCU 21, and the MCU 21 determines whether it is in a dim environment or a bright environment according to the detection result. In a dim environment, the backlight driving circuit 33 can be controlled to adjust the backlight module 34 to provide a backlight with lower brightness to reduce the glare of the user when viewing, and to control the backlight driving circuit 33 to adjust the backlight if the environment is brighter. The module 34 provides a higher brightness backlight to enhance the detailed content display of the picture.

However, the existing LCD TV receives the boot time required to display the screen after the user presses the power button on the remote controller to issue the power-on external command in the standby mode, that is, the time required for steps S14 to S17 shown in FIG. 2, often It takes more than 10 seconds to make the user feel bad.

The object of the present invention is to provide a quick start method for a liquid crystal television, which allows the user to feel that the boot time is relatively short.

In order to achieve the above object, the present invention provides a quick start method for a liquid crystal television, wherein the liquid crystal television includes a power supply, an MCU, a photo sensor, an image processor, and a display panel, and the backlight panel is disposed on the display panel. The quick start method of the LCD TV includes: when the LCD TV is in the standby mode, the power supply output standby power supply provides power to the MCU and the photo sensor. When the light sensor detects that the brightness of the ambient light changes faster than the preset value, the MCU controls the LCD TV to enter the pre-boot mode. When the LCD TV is in the pre-boot mode, the MCU controls the power. The source device outputs a first main power source to provide image processor power, and outputs a second main power source as an input power source of the backlight driving circuit of the display panel, and the MCU controls the image processor not to output a signal and control the backlight driving circuit to have a duty cycle of zero. When the LCD TV is in the pre-boot mode and the MCU detects the external command input of the power-on, the MCU controls the LCD TV to enter the normal working mode.

In an embodiment of the present invention, the fast booting method of the liquid crystal television may further include: when the liquid crystal television is in the standby mode, the standby power output of the power supply device further provides a remote control circuit or a button circuit power supply of the liquid crystal television, wherein the MCU can pass The remote control circuit or the button circuit detects the input of the external command to be turned on.

In an embodiment of the present invention, the method for quickly starting the liquid crystal television may further include: when the liquid crystal television is in the pre-boot mode, the first main power output of the MCU control power supply further provides a timing controller power supply of the display panel, and the MCU It also controls the timing controller to not output a signal.

In an embodiment of the present invention, the method for quickly starting the liquid crystal television may further include: when the LCD TV is in the pre-boot mode, the MCU starts to time and does not detect the external command input when the power is turned on within a predetermined time, the MCU controls the LCD TV. Go back to standby mode.

In an embodiment of the present invention, the fast booting method of the liquid crystal television may further include: when the liquid crystal television is in a normal working mode, the MCU controls the output signal of the image processor, and then controls the backlight driving circuit to have a duty cycle of not zero to enable the backlight mode. The group provides backlighting.

In the standby mode, the liquid crystal television of the present invention uses the light sensor to detect the ambient light to determine whether the brightness change speed of the ambient light exceeds a preset value, and if so, indicates that the LCD TV has been used, so the LCD TV Entering the pre-boot mode, the power supply first outputs the first and second main powers, so that the image interface circuit and the image processor start to receive the input video and process but do not output signals, and the backlight driving circuit starts to receive the input power but does not Converting the output, so there will not be too much power consumption, but it can enter the normal working mode to display the screen immediately after receiving the external command of the user input, which allows the user to feel that the boot time is quite short and leaves excellent Use feeling.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

1‧‧‧Power board

11‧‧‧Electromagnetic interference filter

12‧‧‧Bridge rectifier

13‧‧‧Power Corrector

14‧‧‧Main power converter

15‧‧‧Standby power converter

16‧‧‧Power switch

2, 2'‧‧‧ motherboard

21‧‧‧MCU

22‧‧‧Remote circuit

23‧‧‧Image interface circuit

24‧‧‧Image Processor

25‧‧‧Light sensor

3‧‧‧ display panel

31‧‧‧ Timing Controller

32‧‧‧LCD screen

33‧‧‧Backlight drive circuit

34‧‧‧Backlight module

Vcc‧‧‧ internal power supply

Vm1, Vm2‧‧‧ main power supply

Vsb‧‧‧Standby power supply

PS_ON‧‧‧Power start signal

S11‧‧‧AC power input

S12‧‧‧Power supply only outputs standby power to provide MCU and remote circuit power supply

S13‧‧‧External commands for power on

S14‧‧‧MCU output power start signal

S15‧‧‧Power supply also outputs main power to supply all other components

S16‧‧‧Image processor controls the LCD screen display by the timing controller after input video processing

S17‧‧‧ backlight module provides backlight

S18‧‧‧External commands for shutdown

S21‧‧‧AC power input

S22‧‧‧Power supply only outputs standby power supply to provide MCU, remote control circuit and light sensor power supply

S23‧‧‧ Whether the ambient light brightness change speed exceeds the preset value

S24‧‧‧MCU output power start signal and control image processor does not output signal and control backlight drive circuit duty cycle is zero

S25‧‧‧Power supply also outputs main power to supply all other components

S26‧‧‧External commands for power on

The S27‧‧‧MCU controls the image processor output signal, and the image processor controls the LCD screen display by the timing controller after input video processing

S28‧‧‧MCU control backlight driver circuit duty cycle is not zero, backlight module provides backlight

S29‧‧‧External commands for shutdown

Whether the time of S31‧‧‧ exceeds the scheduled time

1 and 2 are respectively a system architecture diagram of a conventional liquid crystal television and a flowchart thereof.

3 and FIG. 4 are respectively a system architecture diagram of a liquid crystal television according to an embodiment of the present invention, and a flowchart thereof.

FIG. 5 is a flow chart of a method for quickly booting a liquid crystal television according to another embodiment of the present invention.

In the following description, in order to present the consistency of the description of the present invention, in the different embodiments, the same element symbols and names are used for the same or similar elements. In addition, some of the conventional elements and electrical coupling relationships between the elements are omitted in the drawings.

3 and FIG. 4 are respectively a system architecture diagram of a liquid crystal television according to an embodiment of the present invention, and a flowchart thereof. Referring first to FIG. 3, the liquid crystal television of the present invention includes a power board 1, a main board 2', and a display panel 3. The power supply board 1 is provided with a power supply, and the power supply includes an electromagnetic interference filter 11, a bridge rectifier 12, a power factor corrector 13, a main power converter 14, a standby power converter 15, and a power supply switch 16. The main board 2' is provided with an MCU 21, a remote control circuit 22, The image interface circuit 23, the image processor 24, and the photo sensor 25, and the photo sensor 25 of the main board 2' of the present invention is powered by the standby power source Vsb as compared with the main board 2 shown in FIG. The display panel 3 is provided with a timing controller 31, a liquid crystal panel 32, a backlight driving circuit 33, and a backlight module 34. The electrical coupling relationship between the components is indicated by a solid line with an arrow indicating a power coupling relationship and a power transmission direction thereof, and a dotted line with an arrow indicates a signal or data coupling relationship and a signal or data transmission direction thereof.

Referring to FIG. 3 and FIG. 4 simultaneously, after the AC power input (step S21), the AC power source suppresses the conductive noise through the electromagnetic interference filter 11, and is rectified by the bridge rectifier 12, and directly input through the power factor corrector 13 The standby power converter 15 is converted into the standby power source Vsb and the internal power source Vcc by the standby power converter 15, and the internal power source Vcc cannot be transmitted through the power supply switch 16 to provide the power factor corrector 13 and the main power converter 14 Since the controller power supply, the main power converter 14 does not output the first and second main power sources Vm1 and Vm2, and the liquid crystal television is in the standby mode without screen display. When the LCD TV is in the standby mode, the power supply only outputs the standby power Vsb to provide power to the MCU 21, the remote control circuit 22, and the photo sensor 25 (step S22), and the photo sensor 25 can detect the ambient light and detect the result. The MCU 21 transmits to the MCU 21, and the MCU 21 determines whether the brightness change speed of the ambient light exceeds a preset value according to the detection result (step S23). If it is determined that the preset value is exceeded, it indicates that the user may be close to the liquid crystal television to shield part of the light that the photo sensor 25 can receive, or that the user turns on or off the fluorescent lamp in the room where the LCD TV is located, Or a user can brighten or dim the fluorescent light in the room, and these are signs that the user has a good chance of using the LCD TV, so the MCU 21 controls the LCD TV to enter the pre-boot mode. On the other hand, if it is judged that the preset value is not exceeded, it indicates that the LCD TV is not used at all, so the LCD TV continues to be in the standby mode.

When the LCD TV is in the pre-boot mode, the MCU 21 outputs the power-on signal PS_ON, and also outputs a control signal for controlling the image processor 24 not to output a signal and controlling the backlight driving circuit 33 to have a duty cycle of zero (step S24), wherein the power source The start signal PS_ON will control the power switch 16 to transmit the internal power source Vcc to provide the controller power supply in the power factor corrector 13 and the main power converter 14, so the main power converter 14 starts outputting the first and second main power sources Vm1 and Vm2 supplies all other component power supplies (step S25). It should be noted that the first main power source Vm1 outputted by the power supply device provides the image interface circuit 23, the image processor 24, the timing controller 31, and the liquid crystal panel 32, so that the image interface circuit 23 starts receiving programs such as wireless or cable television. Or the video camera or the like provided by the video player, the image processor 24 starts to demodulate, decode, or scale the input video received by the image interface circuit 23, but is controlled by the MCU 21 without outputting a signal, so the timing controller 31 and the LCD 32 do not start processing data and display screens, so there is not much power consumption. In addition, although the second main power source Vm2 output from the power supply device is provided as the input power source of the backlight driving circuit 33, but is controlled by the MCU 21 and the duty cycle is zero, the backlight driving circuit 33 does not start the conversion to output the high voltage. The power supply provides backlight module 34 power, so there is not much power consumption. Therefore, the LCD TV is in pre-boot mode and does not add much power.

When the LCD TV is in the pre-boot mode, the power supply still outputs the standby power supply Vsb to provide the MCU 21, the remote control circuit 22 and the light sensor 25 power supply, wherein the remote control circuit 22 receives the button pressed by the user at the remote control at any time. The external command transmits the external command to the MCU 21, and the MCU 21 determines whether the external command is turned on or not (step S26). If it is determined that the external command is not turned on, the MCU 21 regards the external command as invalid, and the LCD TV continues to be in the pre-boot mode. If it is judged that it is an external command to turn on, the MCU 21 will control the LCD TV. Enter the normal working mode.

When the LCD TV is in the normal working mode, the MCU 21 controls the image processor 24 to start outputting the signal, so that the timing controller 31 starts to receive the processed data of the image processor 24 and processes it to control the liquid crystal panel 32 to display the corresponding screen (step S27). ). Then, the MCU 21 controls the duty cycle of the backlight driving circuit 33 to be non-zero, so that the backlight driving circuit 33 starts to convert the second main power source Vm2 into a high voltage power source to supply the backlight module 34, and the backlight module 34 starts to provide backlighting. S28), so that the user can see the picture displayed by the liquid crystal panel 32.

When the LCD TV is in the normal working mode, the power supply still outputs the standby power Vsb to provide the power of the MCU 21, the remote control circuit 22 and the light sensor 25, and the remote control circuit 22 continues to receive the external command issued by the user pressing the button on the remote controller. The external command is transmitted to the MCU 21, and the MCU 21 determines whether the external command is turned off or not (step S29). If it is determined that the external command is not turned off, the MCU 21 performs a corresponding control action according to the external command, and the LCD TV continues to be in the normal operation mode and has a screen display. If it is determined that it is an external command to turn off, the MCU 21 will control the liquid crystal television to return to the standby mode (step S22). In addition, when the LCD TV is in the normal working mode, the light sensor 25 can detect the ambient light and transmit the detection result to the MCU 21, and the MCU 21 determines whether it is in a dim environment or a bright environment according to the ambient light intensity. In a dim environment, the backlight driving circuit 33 can be controlled to adjust the backlight module 34 to provide a backlight with lower brightness to reduce the glare of the user when viewing, and to control the backlight driving circuit 33 to adjust the backlight if the environment is brighter. The module 34 provides a higher brightness backlight to enhance the detailed content display of the picture.

As can be seen from FIG. 4, the liquid crystal television of the present invention determines whether the brightness change speed of the ambient light exceeds a preset value by using the light sensor 25 to detect the ambient light in the standby mode. In some cases, the LCD TV has been used. Therefore, the LCD TV enters the pre-boot mode to control the power supply to output the first and second main power sources Vm1 and Vm2, so that the image interface circuit 23 and the image processor 24 start to receive the input video. The processing is performed but the signal is not output, and the backlight driving circuit 33 starts to receive the input power but does not convert the output, so there is not much power consumption, but it can enter the normal operation immediately upon receiving the external command of the user-initiated power-on. The mode shows the screen. Therefore, the liquid crystal television of the present invention only needs to be turned on after the user presses the power button on the remote controller to issue a power-on external command to the time required to display the screen, that is, the time required for steps S27 to S28 shown in FIG. It takes less than a second to make the user feel that the boot time is quite short and leaves a great feeling of use.

FIG. 5 is a flow chart of a method for quickly booting a liquid crystal television according to another embodiment of the present invention. Referring to FIG. 5, compared with the quick boot method shown in FIG. 4, the quick boot method shown in FIG. 5 further includes: when the LCD TV is in the pre-boot mode, the MCU 21 starts counting and determines whether the remote control circuit 22 is within a predetermined time. An external command issued by the user pressing the button on the remote controller is received, that is, whether the external command is not received if the timing exceeds the predetermined time (step S31). If the external command is not received for more than the predetermined time, the MCU 21 controls the liquid crystal television to return to the standby mode to save power (step S22). If the timing is still within the predetermined time, the MCU 21 continues to judge whether the remote control circuit 22 has received an external command and determines whether it is turned on or not when the remote control circuit 22 receives the external command (step S26). If it is determined that the external command is not turned on, the MCU 21 regards the external command as invalid, and the LCD TV continues to be in the pre-boot mode. If it is determined that the external command is turned on, the MCU 21 will control the LCD TV to enter the normal operation mode.

Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the scope of the present invention, and may be made by those skilled in the art without departing from the spirit and scope of the invention. The scope of protection of the present invention is defined by the scope of the appended claims.

S21‧‧‧AC power input

S22‧‧‧Power supply only outputs standby power supply to provide MCU, remote control circuit and light sensor power supply

S23‧‧‧ Whether the ambient light brightness change speed exceeds the preset value

S24‧‧‧MCU output power start signal and control image processor does not output signal and control backlight drive circuit duty cycle is zero

S25‧‧‧Power supply also outputs main power to supply all other components

S26‧‧‧External commands for power on

The S27‧‧‧MCU controls the image processor output signal, and the image processor controls the LCD screen display by the timing controller after input video processing

S28‧‧‧MCU control backlight driver circuit duty cycle is not zero, backlight module provides backlight

S29‧‧‧External commands for shutdown

Claims (5)

A liquid crystal television includes a power supply, a microcontroller, a light sensor, an image processor and a display panel. The display panel is provided with a backlight module, and the LCD TV is provided. The quick booting method comprises: when the LCD TV is in a standby mode, the power supply outputs a standby power supply to provide the microcontroller and the light sensor power; when the light sensor detects an ambient light When the brightness change speed exceeds a preset value, the microcontroller controls the liquid crystal television to enter a pre-boot mode; when the liquid crystal television is in the pre-boot mode, the microcontroller controls the power supply to output a first main power source Providing the image processor power supply, and outputting a second main power source as an input power of a backlight driving circuit of the display panel, and the microcontroller controls the image processor not to output a signal and control a responsibility of the backlight driving circuit The period is zero; and when the LCD TV is in the pre-boot mode and the microcontroller detects an external command input that is turned on, the microcontroller The LCD TV system enters a normal operating mode. The quick start method of the liquid crystal television according to claim 1, further comprising: when the liquid crystal television is in the standby mode, the standby power output by the power supply further provides a remote control circuit or button of the liquid crystal television The circuit power supply, the microcontroller detects the input of the external command of the boot through the remote control circuit or the button circuit. The method for quickly starting a liquid crystal television according to claim 1, further comprising: when the liquid crystal television is in the pre-boot mode, the microcontroller controls the first main power output of the power supply to provide the A timing controller power supply of the display panel, and the microcontroller also controls the timing controller to not output a signal. The fast booting method of the liquid crystal television of claim 1, further comprising: when the liquid crystal television is in the pre-boot mode, the microcontroller starts timing and does not detect the booting for a predetermined time. When an external command is input, the microcontroller controls the LCD TV to return to the standby mode. The method for quickly starting a liquid crystal television according to claim 1, further comprising: when the liquid crystal television is in the normal working mode, the microcontroller controls the image processor output signal and then controls the backlight driving circuit. The duty cycle is not zero to provide backlighting for the backlight module.