WO2015089926A1 - 背光控制电路、电子装置及显示面板驱动方法 - Google Patents

背光控制电路、电子装置及显示面板驱动方法 Download PDF

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Publication number
WO2015089926A1
WO2015089926A1 PCT/CN2014/070791 CN2014070791W WO2015089926A1 WO 2015089926 A1 WO2015089926 A1 WO 2015089926A1 CN 2014070791 W CN2014070791 W CN 2014070791W WO 2015089926 A1 WO2015089926 A1 WO 2015089926A1
Authority
WO
WIPO (PCT)
Prior art keywords
display screen
eye display
led module
scanning
backlight control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2014/070791
Other languages
English (en)
French (fr)
Inventor
张华�
张先明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TCL China Star Optoelectronics Technology Co Ltd
Original Assignee
Shenzhen China Star Optoelectronics Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US14/413,150 priority Critical patent/US9747845B2/en
Publication of WO2015089926A1 publication Critical patent/WO2015089926A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/385—Image reproducers alternating rapidly the location of the left-right image components on the display screens
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/3413—Details of control of colour illumination sources
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
    • G09G3/003—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background to produce spatial visual effects
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/155—Coordinated control of two or more light sources
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0237—Switching ON and OFF the backlight within one frame
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/38—Switched mode power supply [SMPS] using boost topology

Definitions

  • the present invention relates to a control circuit, and more particularly to a backlight control circuit, an electronic device having the backlight control circuit, and a backlight control method.
  • LEDs light-emitting diodes
  • Current electronic devices such as televisions, computer displays, etc. can often operate in 2D mode or 3D mode.
  • the electronic device When the electronic device is operating in the three-dimensional mode, it is necessary to sequentially scan the left-eye picture and the right-eye picture signal, wherein the scanning time of the left-eye picture and the right-eye picture are the same.
  • the current three-dimensional mode scanning method divides a picture into a plurality of areas for partition scanning, and the backlight module has a plurality of LED strings correspondingly, and after each section is scanned, the corresponding LED string of the partition is illuminated.
  • the backlight control signals output to the plurality of LED strings corresponding to the partitions are a plurality of different signals sequentially delayed. Therefore, in order to output the signals to the LED strings corresponding to different partitions, a corresponding plurality of signal lines are required, and the circuit is complicated and the signal lines are easily interfered.
  • the invention provides a backlight control circuit, an electronic device having the backlight control circuit and a display panel driving method, and the LED module is controlled by the same signal without causing a dry signal between the plurality of signals.
  • a backlight control circuit for driving illumination of an LED module in an electronic device comprising a timing controller and an LED driving unit, the clock controller includes a display signal output pin, and the clock controller outputs the display signal The pin outputs a display screen signal having a first frequency to a display screen for scanning the display screen to drive the display screen for display; wherein the timing controller further includes a backlight control pin, the backlight control pin and the LED The module is electrically connected, wherein when the electronic device operates in the three-dimensional mode, the timing controller controls the scanning of the left-eye display screen or the right-eye display screen to be smaller than the left-eye display screen or the right-eye display screen.
  • the LED module controls the LED module to emit light until the scanning time of the left eye display screen or the right eye display screen ends.
  • the timing controller controls the scanning frequency when performing the scanning of the left eye display and the scanning of the right eye to be the second frequency, wherein the second frequency is N times of the first frequency, thereby , scanning the left eye display screen and the right eye display screen N times in the scanning time of the left eye display screen and the right eye display screen; the timing controller scans the left eye display screen or the right eye display screen for less than N times.
  • the two-level backlight control signal is sent to the LED module, and the LED module is controlled to emit light until the scanning time of the left eye display screen or the right eye display screen ends.
  • the frequency is the first frequency
  • the timing controller controls to output a backlight control signal having a first level to the LED module to control the LED mode within a predetermined time when the left eye display screen or the right eye display screen starts scanning.
  • the group is turned off and does not emit light, and after the left eye display screen or the right eye display screen starts scanning for a predetermined time, the backlight control signal having the second level is output to the LED module, and the LED module is controlled to emit light until The scanning time of the left eye display screen or the right eye display screen ends.
  • the LED module includes a positive input terminal and a plurality of LED strings connected in parallel between the positive input terminal and the ground, and each LED string includes a plurality of LED lights and a MOS transistor connected in series between the positive input terminal and the ground.
  • the backlight control pin of the timing controller is connected to the gate of the MOS transistor of each LED string, and the timing controller controls the backlight control pin to output the backlight control signal having the first level, and controls all the LED strings.
  • the NMOS transistor is turned off, thereby controlling the LED module to not emit light; the timing controller controls the backlight control pin to output a backlight control signal having a second level to the MOS tube of all the LED strings to control the conduction of the NMOS transistors of all the LED strings, thereby Control the LED module to emit light.
  • the control timings of all the LED lamps of the LED module are the same.
  • An electronic device includes an LED module, a display screen, and a backlight control circuit for driving illumination of an LED module in an electronic device, including a timing controller and an LED driving unit, the clock
  • the controller includes a display signal output pin, and the clock controller outputs a display screen signal having the first frequency to the display screen through the display signal output pin to perform scanning of the display screen. Drive the display to display.
  • the timing controller further includes a backlight control pin, and the backlight control pin is electrically connected to the LED module, wherein the timing controller controls the left eye display screen or the right when the electronic device operates in the three-dimensional mode
  • controlling the backlight control pin to output a backlight control signal having the first level to the LED mode within a predetermined time shorter than the scan time of the left eye display screen or the right eye display screen a group, and controlling the LED module to be turned off without emitting light
  • the timing controller controls the output of the backlight control pin to have a second after the predetermined time elapses after the scanning of the left eye display screen and the right eye display screen is switched
  • the level backlight control signal is sent to the LED module, and the LED module is controlled to emit light until the scanning time of the left eye display screen or the right eye display screen ends.
  • the timing controller controls the scanning frequency when performing the scanning of the left eye display and the scanning of the right eye to be the second frequency, wherein the second frequency is N times of the first frequency, thereby , scanning the left eye display screen and the right eye display screen N times in the scanning time of the left eye display screen and the right eye display screen; the timing controller scans the left eye display screen or the right eye display screen for less than N times.
  • the timing controller controls the scanning frequency when the left eye display screen and the right eye display screen are scanned to be the first frequency, and the timing controller starts scanning in the left eye display screen or the right eye display screen for a predetermined time. Controlling the output of the backlight control signal having the first level to the LED module to control the LED module to turn off and not emitting light, and after the left eye display screen or the right eye display screen starts scanning for the predetermined time, the output has the first.
  • the two-level backlight control signal is sent to the LED module, and the LED module is controlled to emit light until the scanning time of the left eye display screen or the right eye display screen ends.
  • the LED module includes a positive input terminal and a plurality of LED strings connected in parallel between the positive input terminal and the ground, and each LED string includes a plurality of LED lights and a MOS transistor connected in series between the positive input terminal and the ground.
  • the backlight control pin of the timing controller is connected to the gate of the MOS transistor of each LED string, and the timing controller controls the backlight control pin to output the backlight control signal having the first level, and controls all the LED strings.
  • the NMOS transistor is turned off, thereby controlling the LED module to not emit light; the timing controller controls the backlight control pin to output a backlight control signal having a second level to the MOS tube of all the LED strings to control the conduction of the NMOS transistors of all the LED strings, thereby Control the LED module to emit light.
  • a driving method of a display panel configured to control illumination of an LED module of the electronic device and control a display screen of the electronic device to scan a left eye display image and a right eye display image when the electronic device operates in the three-dimensional mode
  • the method includes the steps of: controlling the LED module to be turned off within a predetermined time period after the scan of the left eye display screen and the scan of the right eye display screen is smaller than the scan time of the left eye display screen or the right eye display screen. And not emitting light; and controlling the LED module to emit light after the predetermined time elapses after the scanning of the left eye display screen and the right eye display screen is switched.
  • the control timing of all the LED lights in the LED module is synchronous.
  • the scanning frequency is N times the scanning frequency in the two-dimensional mode; the scanning of the left-eye display screen and the right-eye display screen is repeated N times for the left-eye display screen and the right-eye display screen; and the left-eye display screen or the right
  • the LED module is controlled to emit light until the scanning time of the left eye display screen or the right eye display screen ends.
  • the scanning frequency is the frequency in the two-dimensional mode; and after the scanning of the left eye display screen or the right eye display screen is started, the LED module is controlled to emit light until the left eye display screen or the right eye display screen is scanned. time's up.
  • the backlight control circuit of the present invention can control the LED module to emit light by the same signal without causing interference between the plurality of signals.
  • FIG. 1 is a circuit block diagram of an electronic device having a backlight control circuit according to an embodiment of the present invention.
  • Fig. 2 is a timing chart of a backlight control signal outputted by a timing controller of the backlight control circuit in the first embodiment of the present invention.
  • Fig. 3 is a timing chart of a backlight control signal outputted by a timing controller of the backlight control circuit in the second embodiment of the present invention.
  • FIG. 4 is a flow chart showing a method of driving a display panel according to an embodiment of the present invention. detailed description
  • FIG. 1 is a circuit diagram of an electronic device 100 having a backlight control circuit 1 according to the present invention.
  • the electronic device 100 includes the backlight control circuit 1, an LED module 2, and a display screen 3.
  • the backlight control circuit 1 is for driving the illumination of the LED module 2.
  • the LED module 2 includes a positive input terminal V+ and a plurality of LED strings 201 connected in parallel between the positive input terminal V+ and the ground, wherein each LED string 201 includes several serially connected between the positive input terminal V+ and the ground.
  • LED lamp D, a MOS transistor Q and a resistor R are examples of the LED lamp D, a MOS transistor Q and a resistor R.
  • the backlight control circuit 1 includes a timing controller 10 and an LED driving unit 20.
  • the clock controller 10 includes a display signal output pin DP.
  • the clock controller 10 outputs a display screen signal having a corresponding frequency to the display screen 3 through the display signal output pin DP to scan the display screen to drive the display screen. display.
  • the timing controller further includes a backlight control pin opl, and the backlight control pin opl is electrically connected to the LED module 2, and is used for generating a backlight control signal to the LED module 2 to control the LED module 2 to be turned on as a whole or shut down.
  • the timing controller 10 controls the scanning of the left-eye display screen or the right-eye display screen to switch, that is, the control display signal output pin DP outputs the left-eye display screen signal.
  • the backlight control pin op1 is controlled to output a backlight control signal having a first level to the LED module 2, and the LED module 2 is controlled to be turned off without emitting light.
  • the timing controller 10 controls the backlight control pin op1 to output a backlight control signal having a second level to the LED module after the predetermined time elapses after the scanning of the left eye display screen and the right eye display screen is switched. 2.
  • the LED module 2 is controlled to emit light until the scanning time T of the left eye display screen or the right eye display screen ends.
  • the right-eye display screen or the left-eye display screen starts scanning.
  • the electronic device 100 can operate in a two-dimensional mode or a three-dimensional mode.
  • the clock controller 10 outputs a display signal having a first frequency to the display screen 3 through the display signal output pin DP.
  • the display screen is scanned and the display screen 3 is driven to display.
  • working in an electronic device Scanning and the scanning time of the left eye display screen and the right eye display screen are all equal to the scan time T.
  • the timing controller 10 controls the scanning frequency when performing the left-eye display screen and the right-eye display screen scanning to be the second frequency, wherein The second frequency is twice the first frequency, so that the left eye display screen and the right eye display screen are repeatedly scanned within the scanning time ⁇ of the left eye display screen and the right eye display screen.
  • the timing controller 10 outputs a backlight control signal having the first level to the LED module 2 while the left eye display screen or the right eye display screen scans less than one time, and controls the LED module 2 to be turned off. Glowing.
  • the timing controller 10 outputs a backlight control signal having the second level to the LED module 2 after the left eye display screen or the right eye display screen scans M times less than N times, and controls the LED module 2
  • the illumination is not performed until the left eye display screen or the right eye display screen is scanned N times, that is, until the scanning time T of the left eye display screen or the right eye display screen ends.
  • N and M are natural numbers.
  • N is 2 and M is 1.
  • N can be 4, 8, etc., and M can be any natural number less than N.
  • the backlight control circuit 1 further includes a crystal oscillation circuit 30.
  • the crystal oscillator circuit 30 is for generating a clock signal of a specific frequency, and the timing controller 10 receives the clock signal generated by the crystal oscillator circuit 30 to control output of a display screen signal having a corresponding frequency.
  • the crystal oscillator circuit 30 is configured to generate a clock signal of the first frequency or the second frequency.
  • the crystal oscillator circuit 30 may include a plurality of crystal oscillators (not shown) that generate clock signals of different frequencies.
  • the timing controller 10 selects 4 to receive the clock signal having the first frequency when the electronic device 100 operates in the two-dimensional mode, thereby controlling the output of the display signal signal of the first frequency to the display screen 3 to perform scanning of the display screen to control Display of display 3.
  • the timing controller 10 selects to receive the clock signal having the second frequency when the electronic device 100 operates in the three-dimensional dimensional mode, thereby controlling the output of the display signal signal of the second frequency to the display screen 3 to perform the left-eye display screen and the right eye.
  • the display of the display screen 3 is controlled by scanning the display screen.
  • the crystal oscillator circuit 30 can output a clock signal of the first frequency or the second frequency according to whether the electronic device 100 is currently in the two-dimensional mode or the three-dimensional mode.
  • the timing controller 10 controls the scanning frequency when the left eye display screen and the right eye display screen are scanned to be the first frequency, that is, the scanning frequency remains unchanged.
  • the scanning frequency is equal in 2D mode.
  • the timing controller 10 controls to output a backlight control signal having a first level to a predetermined time after the left eye display screen or the right eye display screen starts scanning.
  • the LED module 2 controls the LED module 2 to be turned off and does not emit light.
  • the timing controller 10 outputs a backlight control signal having the second level to the LED module 2 after the scanning of the left eye display screen or the right eye display screen is started, and controls the LED module 2 to emit light. Until the scanning time T of the left eye display screen or the right eye display screen ends.
  • the backlight control pins op1 of the timing controller 10 are electrically connected to the gates of the MOS transistors Q of each LED string 201 of the LED module 2. connection.
  • the timing controller 10 outputs a backlight control signal having the first level to the LED module 2, and controls the LED module 2 to emit light: outputting a backlight control signal having a first level to the LED string 201.
  • the gate of the MOS transistor Q controls the current loop of all the LED strings 201 to be turned on, thereby controlling the LED module 2 to be turned on to emit light.
  • the MOS transistor Q of each LED string 201 is an NMOS transistor, the first level is a low level, and the second level is a high level.
  • the MOS transistor Q of the LED string 201 can also be a PMOS transistor, the first level is a high level, and the second level is a low level.
  • the backlight control circuit 1 further includes a connection interface C1 including a power pin VP, a ground pin GND, and a control pin PP.
  • the power pin VP is used to connect a power source 50 to obtain a power voltage Vin.
  • the power pin VP is electrically connected to the positive input terminal V+ of the LED module 2 to provide the power voltage Vin to the LED module 2.
  • the ground pin GND is grounded.
  • the backlight control pin op1 of the timing controller 10 is connected to the control pin PP of the connection interface C1, and is electrically connected to the gate of the MOS transistor Q of each LED string 201 through the control pin PP.
  • the timing controller 10 since the backlight control signal is to control the entire LED module 2, the timing controller 10 outputs a backlight control signal, that is, only one connection is needed to the timing controller 10 and the connection interface C1.
  • the signal line between the control pins PP can be used.
  • the timing controller 10 further includes a 2D/3D signal input pin In1, and the 2D/3D signal input pin In1 is connected to a 2D/3D signal terminal 60 for The two-dimensional signal or the three-dimensional signal generated by the 2D/3D signal terminal 60 is received.
  • the 2D/3D signal terminal 60 generates a corresponding two-dimensional signal or a three-dimensional signal when the electronic device 100 operates in a two-dimensional mode or a three-dimensional mode.
  • the 2D/3D signal terminal 60 can be a pin of a processing unit (not shown) of the electronic device 100, and the processing unit outputs the 2D/3D signal terminal 60 according to the current working mode of the electronic device 100.
  • the timing controller 10 is configured to select to receive a clock signal having a first frequency generated by the crystal oscillator circuit 30 or have a second frequency according to a signal received by the 2D/3D signal input pin In1. Clock signal.
  • the interface C1 further includes a detection pin DET and an enable pin BLON, and the detection pin DET and the enable pin BLON are connected to the LED driving unit 20.
  • the timing controller 10 further includes a detection pin DET1 and an enable pin BLON1.
  • the detection pin DET1 of the timing controller 10 is enabled.
  • the foot BLON1 is respectively connected to the detection bow I pin DET, the enable pin BLON of the connection interface C1, and is connected to the LED drive unit 20 through the connection interface C1.
  • the timing controller 10 detects whether the working state of the LED driving unit 20 is abnormal by detecting the pin DET1, and enables the LED driving unit 20 or disables the LED driving unit 20 through the enabling pin BLON1. This part is the same as the existing one, so it will not be described.
  • connection interface C1 further includes a 2D/3D reference voltage pin RP
  • the timing controller 10 further includes a reference voltage output pin op2.
  • the LED driving unit 20 includes a reference voltage terminal 22.
  • the reference voltage output pin op2 of the timing controller 10 is connected to the reference voltage terminal 22 through the 2D/3D reference voltage pin RP of the connection interface C1.
  • the timing controller 10 further controls the reference voltage output pin op2 to output a two-dimensional reference voltage when the 2D/3D signal input pin In1 receives the two-dimensional signal, thereby passing the 2D/3D reference of the connection interface C1.
  • the voltage pin RP is supplied to the reference voltage terminal 22 of the LED drive unit 20.
  • the timing controller 10 controls the reference voltage output pin op2 to output a three-dimensional reference voltage, thereby introducing the 2D/3D reference voltage through the connection interface C1.
  • the foot RP is supplied to the reference voltage terminal 22 of the LED drive unit 20.
  • the three-dimensional reference voltage is greater than the two-dimensional reference voltage.
  • the LED driving unit 20 includes a plurality of comparators A1, and the non-inverting input terminals (not labeled in the figure) of each comparator A1 are connected to the reference voltage terminal 22, and each comparator A1
  • the inverting input (not labeled) is coupled to the remote end of the resistor R of an LED string 201.
  • the output of each comparator A1 (not labeled) is coupled to the gate of the NMOS transistor Q of an LED string 201.
  • the voltage at the remote end of the resistor R reflects the operating voltage of the LED string 201 in which it is located.
  • the comparator A1 compares the two-dimensional reference voltage or the three-dimensional reference voltage received by the reference voltage terminal 22 with the voltage of the remote end of the resistor R, and compares the voltage of the remote end of the resistor R to be higher than the second
  • the MOS transistor Q in the corresponding LED string 201 is controlled to be turned off by outputting a low-level signal at the output terminal, thereby performing overvoltage protection.
  • the two-dimensional reference voltage is lower than the three-dimensional reference voltage, it can ensure that the electronic device 100 can quickly perform overvoltage protection when operating in the two-dimensional mode.
  • the LED driving unit 20 further includes a control terminal 21, and the backlight control circuit 1 further includes a switching unit 40.
  • the switch unit 40 is connected between the power pin VP of the connection interface C1 and the ground.
  • the LED drive unit 20 outputs a PWM signal through the control terminal 21 to control the switch unit 40 to be alternately turned on and off, thereby connecting the power pin.
  • the power supply voltage Vin connected to the VP is converted into a switching power supply signal to supply power to the LED module 20.
  • the switch unit 40 is a MOS transistor Q1.
  • the gate of the MOS transistor Q1 is connected to the control terminal 21 of the LED driving unit 20, and the source is electrically connected to the power pin VP of the connection interface C1 and the positive input terminal V+ of the LED module 20, and the drain is grounded.
  • the MOS transistor Q and the MOS transistor Q1 may be replaced by NPN transistors.
  • circuit control circuit 1 shown in Fig. 1 further includes other circuit elements, which are not described because they are not related to the main improvement of the present invention.
  • the electronic device 100 can be an electronic device such as a mobile phone, a tablet computer, a display, or a television.
  • FIG. 4 is a flowchart of a method for driving a display panel according to an embodiment of the present invention.
  • the display panel driving method is used for controlling the illumination of the LED module 2 of the electronic device 100 and controlling the display screen 3 of the electronic device 100 to perform scanning of the left eye display screen and the right eye display screen when the electronic device 100 operates in the three-dimensional mode.
  • the timing controller 100 controls the display screen 3 to perform scanning of the left-eye display screen and the right-eye display screen (S401).
  • the timing controller 10 controls the LED module 2 to be turned off within a predetermined time period after the scan of the left-eye display screen and the right-eye display screen is switched, which is smaller than the scan time T of the left-eye display screen or the right-eye display screen. Does not emit light (S402). Specifically, the timing controller 10 controls the backlight control pin op1 to output a backlight control signal having a first level to the LED module 2, and controls the LED module 2 to be turned off without emitting light.
  • the timing controller 10 controls the LED module 2 to emit light until the scanning of the left eye display screen and the right eye display screen is performed for a predetermined period of time until the left eye display screen or the right eye display screen
  • the scan time T ends (S403).
  • the timing controller 10 controls the backlight control pin op1 to output a backlight control signal having a second level to the LED module 2 to control the LED module 2 to emit light.
  • the timing controller 10 controls the scanning frequency of the display screen 3 when performing the left eye display screen and the right eye display screen scanning to be N times the scanning frequency in the two-dimensional mode; in the left eye display screen and the right The left eye display screen and the right eye display screen are repeatedly scanned N times in the scan time T of the eye display screen; and the backlight control signal is output to the LED after the left eye display screen or the right eye display screen is scanned M times less than N times
  • the module 2 controls the LED module 2 to emit light until the scanning time T of the left eye display screen or the right eye display screen ends.
  • the timing controller 10 controls the scanning frequency when the left eye display screen and the right eye display screen is scanned to be the frequency in the two-dimensional mode, and starts the left eye display screen or the right eye display screen. After the scanning for the predetermined time T, a backlight control signal having a second level is outputted to the LED module 2, and the LED module 2 is controlled to emit light until the scanning time T of the left-eye display screen or the right-eye display screen ends.

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Abstract

一种背光控制电路（1）、电子装置（100）及显示面板驱动方法。背光控制电路（1）用于控制电子装置（100）的LED模组（2）的发光，该驱动方法包括步骤：在电子装置（100）工作在三维模式时，控制进行左眼显示画面以及右眼显示画面的扫描（S401）；在控制该左眼显示画面以及右眼显示画面的扫描进行切换后的小于该左眼显示画面或右眼显示画面的扫描时间的预定时间内，该LED模组（2）关闭而不发光（S402）；以及控制该左眼显示画面以及右眼显示画面的扫描进行切换后经过该预定时间后，控制该LED模组（2）发光（S403）。该驱动方法能够用同一个信号控制LED模组（2），不会造成多个信号间的干扰且结构简单。

Description

说 明 书 背光控制电路、 电子装置及显示面板驱动方法 技术领域
本发明涉及一种控制电路， 特别涉及一种背光控制电路及具有该背光控制电 路的电子装置及背光控制方法。 背景技术
目前使用 LED (发光二极管， light-emitting diode )作为背光模组的电子装置 越来越多。 目前的电子装置例如电视机、 电脑显示屏等往往能工作在二维模式（2D Mode )或三维模式（ 3D Mode )。 电子装置在工作在三维模式下时， 需要依次进行 左眼画面和右眼画面信号的扫描 , 其中左眼画面以及右眼画面的扫描时间相同。 目前的三维模式扫描方式为将一副画面分为了多个区域而进行分区扫描 , 而背光 模组相应具有多个 LED串，在每一分区扫描完后紧接着点亮该分区对应的 LED串。 从而， 输出给对应该些分区的多个 LED串的背光控制信号为依次延迟的多个不同 的信号。 从而， 相应的为了输出该些信号给不同分区对应的 LED串， 则需要相应 的多个信号线， 电路复杂且信号线之间容易干扰。 发明内容
本发明提供一种背光控制电路、 具有该背光控制电路的电子装置及显示面板 驱动方法， 通过同一信号控制 LED模组， 而不会造成多个信号之间的干 4尤。
一种背光控制电路， 用于驱动一电子装置中的 LED模组的发光， 包括时序控 制器以及 LED驱动单元， 该时钟控制器包括一显示信号输出引脚， 该时钟控制器 通过该显示信号输出引脚输出具有第一频率的显示画面信号至一显示屏而进行显 示画面的扫描而驱动显示屏进行显示； 其中， 该时序控制器还包括一背光控制引 脚， 该背光控制引脚与该 LED模组电连接， 其中， 在电子装置工作在三维模式时， 该时序控制器控制该左眼显示画面或右眼显示画面的扫描进行切换时， 在小于该 左眼显示画面或右眼显示画面的扫描时间的预定时间之内， 控制该背光控制引脚 输出具有第一电平的背光控制信号至该 LED模组，而控制该 LED模组关闭而不发 光； 该时序控制器并控制在左眼显示画面以及右眼显示画面的扫描进行切换后经 过该预定时间后， 控制该背光控制引脚输出具有第二电平的背光控制信号至该
LED模组， 而控制该 LED模组发光直到该左眼显示画面或右眼显示画面的扫描时 间结束。
其中， 在电子装置工作在三维模式时， 该时序控制器控制在进行左眼显示画 面以及右眼显示画面扫描时的扫描频率为第二频率，其中第二频率为第一频率的 N 倍， 从而， 在左眼显示画面与右眼显示画面的扫描时间内重复扫描 N次左眼显示 画面以及右眼显示画面； 该时序控制器并在左眼显示画面或右眼显示画面扫描小 于 N次的 M次之内输出具有该第一电平的背光控制信号至该 LED模组而控制 LED 模组关闭不发光， 并在左眼显示画面或右眼显示画面扫描经过该 M次后， 输出具 有该第二电平的背光控制信号至该 LED模组，控制该 LED模组发光，直到该左眼 显示画面或右眼显示画面的扫描时间结束。 描频率为第一频率， 该时序控制器并在左眼显示画面或右眼显示画面开始进行扫 描的预定时间内， 控制输出具有第一电平的背光控制信号至该 LED模组而控制 LED模组关闭不发光， 并在左眼显示画面或右眼显示画面开始进行扫描经过该预 定时间后，输出具有该第二电平的背光控制信号至该 LED模组，控制该 LED模组 发光， 直到该左眼显示画面或右眼显示画面的扫描时间结束。
其中， 该 LED模组包括正极输入端以及并联于该正极输入端以及地之间的多 个 LED串， 每一 LED串包括串联于正极输入端以及地之间的若干 LED灯以及一 MOS管， 该时序控制器的背光控制引脚与该每一 LED串的 MOS管的栅极连接， 该时序控制器控制背光控制引脚输出具有第一电平的背光控制信号时， 而控制所 有 LED串的 NMOS管截止， 从而控制 LED模组不发光； 该时序控制器控制背光 控制引脚输出具有第二电平的背光控制信号至所有 LED串的 MOS管而控制所有 LED串的 NMOS管导通， 从而控制 LED模组发光。
其中， 该 LED模组的所有 LED灯的控制时序相同。
一种电子装置， 包括一 LED模组、 一显示屏以及一背光控制电路， 该背光控 制电路，用于驱动一电子装置中的 LED模组的发光， 包括时序控制器以及 LED驱 动单元， 该时钟控制器包括一显示信号输出引脚， 该时钟控制器通过该显示信号 输出引脚输出具有第一频率的显示画面信号至一显示屏而进行显示画面的扫描而 驱动显示屏进行显示。 其中， 该时序控制器还包括一背光控制引脚， 该背光控制 引脚与该 LED模组电连接， 其中， 在电子装置工作在三维模式时， 该时序控制器 控制该左眼显示画面或右眼显示画面的扫描进行切换时， 在小于该左眼显示画面 或右眼显示画面的扫描时间的预定时间之内， 控制该背光控制引脚输出具有第一 电平的背光控制信号至该 LED模组， 而控制该 LED模组关闭而不发光；该时序控 制器并控制在左眼显示画面以及右眼显示画面的扫描进行切换后经过该预定时间 后， 控制该背光控制引脚输出具有第二电平的背光控制信号至该 LED模组， 而控 制该 LED模组发光直到该左眼显示画面或右眼显示画面的扫描时间结束。
其中， 在电子装置工作在三维模式时， 该时序控制器控制在进行左眼显示画 面以及右眼显示画面扫描时的扫描频率为第二频率，其中第二频率为第一频率的 N 倍， 从而， 在左眼显示画面与右眼显示画面的扫描时间内重复扫描 N次左眼显示 画面以及右眼显示画面； 该时序控制器并在左眼显示画面或右眼显示画面扫描小 于 N次的 M次之内输出具有该第一电平的背光控制信号至该 LED模组而控制 LED 模组关闭不发光， 并在左眼显示画面或右眼显示画面扫描经过该 M次后， 输出具 有该第二电平的背光控制信号至该 LED模组，控制该 LED模组发光，直到该左眼 显示画面或右眼显示画面的扫描时间结束。
其中， 该时序控制器控制在进行左眼显示画面以及右眼显示画面扫描时的扫 描频率为第一频率， 该时序控制器并在左眼显示画面或右眼显示画面开始进行扫 描的预定时间内， 控制输出具有第一电平的背光控制信号至该 LED模组而控制 LED模组关闭不发光， 并在左眼显示画面或右眼显示画面开始进行扫描经过该预 定时间后，输出具有该第二电平的背光控制信号至该 LED模组，控制该 LED模组 发光， 直到该左眼显示画面或右眼显示画面的扫描时间结束。
其中， 该 LED模组包括正极输入端以及并联于该正极输入端以及地之间的多 个 LED串， 每一 LED串包括串联于正极输入端以及地之间的若干 LED灯以及一 MOS管， 该时序控制器的背光控制引脚与该每一 LED串的 MOS管的栅极连接， 该时序控制器控制背光控制引脚输出具有第一电平的背光控制信号时， 而控制所 有 LED串的 NMOS管截止， 从而控制 LED模组不发光； 该时序控制器控制背光 控制引脚输出具有第二电平的背光控制信号至所有 LED串的 MOS管而控制所有 LED串的 NMOS管导通， 从而控制 LED模组发光。 一种显示面板的驱动方法， 用于在一电子装置工作在三维模式时， 控制该电 子装置的 LED模组的发光和控制电子装置的显示屏进行左眼显示画面以及右眼显 示画面的扫描， 其中， 所述方法包括步骤： 在该左眼显示画面以及右眼显示画面 的扫描进行切换后的小于该左眼显示画面或右眼显示画面的扫描时间的预定时间 内， 控制该 LED模组关闭而不发光； 以及在该左眼显示画面以及右眼显示画面的 扫描进行切换后经过该预定时间后， 控制该 LED模组发光。
其中， 该 LED模组内的所有 LED灯的控制时序是同步的。
其中， 该步骤 "控制该左眼显示画面以及右眼显示画面的扫描进行切换后经 过该预定时间后， 控制该 LED模组发光" 为： 控制在进行左眼显示画面以及右眼 显示画面扫描时的扫描频率为二维模式下扫描频率的 N倍； 在左眼显示画面与右 眼显示画面的扫描时间内重复扫描 N次左眼显示画面以及右眼显示画面； 以及在 左眼显示画面或右眼显示画面扫描了小于 N次的 M次时， 控制该 LED模组发光 直到该左眼显示画面或右眼显示画面的扫描时间结束。
其中， 该步驟 "控制该左眼显示画面以及右眼显示画面的扫描进行切换后经 过该预定时间后， 控制该 LED模组发光" 为： 控制在进行左眼显示画面以及右眼 显示画面扫描时的扫描频率为二维模式下的频率； 以及在左眼显示画面或右眼显 示画面开始进行扫描经过该预定时间后， 控制该 LED模组发光直到该左眼显示画 面或右眼显示画面的扫描时间结束。
本发明的背光控制电路、 具有该背光控制电路的电子装置及显示面板驱动方 法， 能够用同一个信号控制 LED模组发光， 不会造成多个信号间的干扰。 附图说明
图 1是本发明一实施方式中具有背光控制电路的电子装置的电路架构图。 图 2是本发明第一实施方式中的背光控制电路的时序控制器输出的背光控制 信号的时序图。
图 3是本发明第二实施方式中的背光控制电路的时序控制器输出的背光控制 信号的时序图。
图 4是本发明一实施方式中显示面板驱动方法的流程图。 具体实施方式
请一并参阅图 1及图 2,图 1为本发明具有背光控制电路 1的电子装置 100的 电路架构图。 该电子装置 100包括该背光控制电路 1、 一 LED模组 2以及一显示 屏 3。 该背光控制电路 1用于驱动 LED模组 2的发光。 其中， 该 LED模组 2包括 正极输入端 V+以及并联于该正极输入端 V+以及地之间多个 LED串 201 , 其中， 每一 LED串 201包括串联于正极输入端 V+以及地之间的若干 LED灯 D、一 MOS 管 Q以及一电阻 R。
该背光控制电路 1包括时序控制器 10以及 LED驱动单元 20。 该时钟控制器 10包括一显示信号输出引脚 DP, 该时钟控制器 10通过该显示信号输出引脚 DP 输出具有相应频率的显示画面信号至显示屏 3 而进行显示画面的扫描而驱动显示 屏进行显示。
其中， 该时序控制器还包括一背光控制引脚 opl， 该背光控制引脚 opl 与该 LED模组 2电连接， 用于产生背光控制信号至 LED模组 2而控制 LED模组 2整 体开启或关闭。 其中， 在电子装置 1工作在三维模式时， 该时序控制器 10控制该 左眼显示画面或右眼显示画面的扫描进行切换时， 即 , 控制显示信号输出引脚 DP 从输出左眼显示画面信号切换至输出右眼显示画面信号， 或者控制显示信号输出 引脚 DP从输出右眼显示画面信号切换至输出左眼显示画面信号时，在小于该左眼 显示画面或右眼显示画面的扫描时间 T的预定时间之内，控制该背光控制引脚 opl 输出具有第一电平的背光控制信号至该 LED模组 2, 而控制该 LED模组 2关闭而 不发光。 该时序控制器 10并控制在左眼显示画面以及右眼显示画面的扫描进行切 换后经过该预定时间后， 控制该背光控制引脚 opl 输出具有第二电平的背光控制 信号至该 LED模组 2, 而控制该 LED模组 2发光直到该左眼显示画面或右眼显示 画面的扫描时间 T结束。
显然 , 该左眼显示画面或右眼显示画面的扫描进行切换时即为该右眼显示画 面或左眼显示画面开始扫描时。
其中， 该电子装置 100可工作在二维模式或三维模式， 在二维模式下， 该时 钟控制器 10通过该显示信号输出引脚 DP输出具有第一频率的显示画面信号至显 示屏 3而进行显示画面的扫描而驱动显示屏 3进行显示。 其中， 在电子装置工作 扫描， 且左眼显示画面以及右眼显示画面扫描的时间相等均为扫描时间 T。
如图 2所示， 在第一实施方式中， 在电子装置工作在三维模式时， 该时序控 制器 10控制在进行左眼显示画面以及右眼显示画面扫描时的扫描频率为第二频 率， 其中第二频率为第一频率的 Ν倍， 从而， 在左眼显示画面与右眼显示画面的 扫描时间 Τ 内重复扫描 Ν次左眼显示画面以及右眼显示画面。 该时序控制器 10 并在左眼显示画面或右眼显示画面扫描小于 Ν次的 Μ次之内输出具有该第一电平 的背光控制信号至该 LED模组 2而控制 LED模组 2关闭不发光。 该时序控制器 10并在左眼显示画面或右眼显示画面扫描了小于 N次的 M次后，输出具有该第二 电平的背光控制信号至该 LED模组 2,控制该 LED模组 2发光直到该左眼显示画 面或右眼显示画面扫描完 N次， 即直到该左眼显示画面或右眼显示画面的扫描时 间 T结束。
具体的， N以及 M均为自然数， 例如， 如图 2所示， N为 2， M为 1。 显然， N可为 4、 8等， M可为小于 N的任意自然数。
其中， 如图 1所示， 在第一实施方式中， 该背光控制电路 1还包括晶振电路 30。 该晶振电路 30用于产生特定频率的时钟信号， 该时序控制器 10接收该晶振 电路 30产生的时钟信号而控制输出具有相应频率的显示画面信号。
具体的， 该晶振电路 30用于产生该第一频率或第二频率的时钟信号。 其中， 在第一实施方式中，该晶振电路 30可包括多个产生不同频率时钟信号的晶振器（图 中未示）。 该时序控制器 10在电子装置 100工作在二维模式时， 选 4 接收该具有 第一频率的时钟信号， 从而控制输出第一频率的显示画面信号至显示屏 3 而进行 显示画面的扫描而控制显示屏 3的显示。 该时序控制器 10在电子装置 100工作在 三维维模式时， 选择接收该具有第二频率的时钟信号， 从而控制输出第二频率的 显示画面信号至显示屏 3 而进行左眼显示画面以及右眼显示画面的扫描而控制显 示屏 3的显示。 该在其他实施方式中， 该晶振电路 30可根据电子装置 100当前处 于二维模式或三维模式而输出第一频率或第二频率的时钟信号。
请参考图 3, 其中， 在第二实施方式中， 该时序控制器 10控制在进行左眼显 示画面以及右眼显示画面扫描时的扫描频率为第一频率， 即扫描频率维持不变而 与该二维模式下的扫描频率相等。 该时序控制器 10并在左眼显示画面或右眼显示 画面开始进行扫描后的预定时间内， 控制输出具有第一电平的背光控制信号至该 LED模组 2而控制 LED模组 2关闭不发光。 该时序控制器 10并在左眼显示画面 或右眼显示画面开始进行扫描经过该预定时间后， 输出具有该第二电平的背光控 制信号至该 LED模组 2， 控制该 LED模组 2发光， 直到该左眼显示画面或右眼显 示画面的扫描时间 T结束。
具体的， 在本发明的第一实施方式与第二实施方式中， 该时序控制器 10的背 光控制引脚 opl均与该 LED模组 2的每一 LED串 201的 MOS管 Q的栅极电连接。 其中， 时序控制器 10输出具有该第一电平的背光控制信号至该 LED模组 2， 控制 该 LED模组 2发光为： 输出具有第一电平的背光控制信号至该所有 LED 串 201 的 MOS管 Q的栅极而控制所有 LED串 201的电流回路导通，从而控制该 LED模 组 2开启而发光。
更具体的，每一 LED串 201的 MOS管 Q为 NMOS管，该第一电平为低电平， 该第二电平为高电平。 显然， 该一 LED串 201的 MOS管 Q也可为 PMOS管， 该 第一电平为高电平， 该第二电平为低电平。
其中， 如图 1所示， 该背光控制电路 1还包括一连接接口 C1 , 该连接接口 C1 包括电源引脚 VP、 接地引脚 GND以及控制引脚 PP。 该电源引脚 VP用于连接一 电源 50而获得电源电压 Vin， 该电源引脚 VP与该 LED模组 2的正极输入端 V+ 电连接而提供该电源电压 Vin给该 LED模组 2。 该接地引脚 GND接地。
其中， 该时序控制器 10的背光控制引脚 opl与该连接接口 C1的控制引脚 PP 连接， 并通过该控制引脚 PP与每一 LED串 201的 MOS管 Q的栅极电连接。
在本实施方式中， 由于该背光控制信号为控制整个 LED模组 2， 从而， 该时 序控制器 10输出一个背光控制信号即可， 即， 只需要一根连接于时序控制器 10 以及连接接口 C1的控制引脚 PP之间的信号线即可。
在本实施方式中， 如图 1所示， 该时序控制器 10还包括一 2D/3D信号输入引 脚 Inl ,该 2D/3D信号输入引脚 Inl与一 2D/3D信号端 60连接，用于接收该 2D/3D 信号端 60产生的二维信号或三维信号。 其中， 该用于 2D/3D信号端 60在电子装 置 100 工作在二维模式或三维模式时产生相应的二维信号或三维信号。 其中， 该 2D/3D信号端 60可为电子装置 100具有的一处理单元（图中未示） 的引脚， 该处 理单元根据电子装置 100当前的工作模式而通过该 2D/3D信号端 60输出相应的二 维信号或三维信号。 其中，在第一实施方式中，该时序控制器 10用于根据 2D/3D信号输入引脚 Inl 接收的信号而选择接收该晶振电路 30产生的具有第一频率的时钟信号或具有第二 频率的时钟信号。
其中， 该连 口 C1还包括侦测引脚 DET以及使能引脚 BLON, 侦测引脚 DET以及使能引脚 BLON均与该 LED驱动单元 20连接。该时序控制器 10还包括 侦测引脚 DET1以及使能引脚 BLON1 , 该时序控制器 10的侦测引脚 DET1、 使能 ？ ]脚 BLON1分别与连接接口 C 1的该侦测弓 I脚 DET、使能 ]脚 BLON连接， 而通 过该连接接口 C1连接至该 LED驱动单元 20。其中，该时序控制器 10通过侦测引 脚 DET1侦测 LED驱动单元 20的工作状态是否异常，通过该使能引脚 BLON1使 能该 LED驱动单元 20或禁能该 LED驱动单元 20。 该部分与现有相同， 故不加赘 述。
其中，该连接接口 C1还包括 2D/3D参考电压引脚 RP，该时序控制器 10还包 括参考电压输出引脚 op2。 其中， 该 LED驱动单元 20包括一参考电压端 22。 该 时序控制器 10的参考电压输出引脚 op2通过该连接接口 C1的 2D/3D参考电压引 脚 RP与该参考电压端 22连接。
其中， 该时序控制器 10还在 2D/3D信号输入引脚 Inl接收到二维信号时， 控 制该参考电压输出引脚 op2输出一二维参考电压， 从而通过该连接接口 C1 的 2D/3D参考电压引脚 RP提供给该 LED驱动单元 20的参考电压端 22。
该时序控制器 10还在该 2D/3D信号输入引脚 Inl接收到三维信号时， 控制该 参考电压输出引脚 op2输出一三维参考电压，从而通过该连接接口 C 1的 2D/3D参 考电压引脚 RP提供给该 LED驱动单元 20的参考电压端 22。 其中， 该三维参考 电压大于该二维参考电压。
具体的， 如图 1所示， 该 LED驱动单元 20包括若干比较器 Al， 每一比较器 A1的正相输入端（图中未标号）均与该参考电压端 22连接， 每一比较器 A1的反 相输入端 （图中未标号）与一 LED 串 201 的电阻 R的远地端连接。 每一比较器 A1的输出端 （图中未标号 )与一 LED串 201的 NMOS管 Q的栅极连接。 其中， 电阻 R远地端的电压反映了所在的 LED串 201的工作电压。
其中 , 每一比较器 A1将该参考电压端 22接收的二维参考电压或三维参考电 压与该电阻 R远地端的电压进行比较， 并在比较该电阻 R远地端的电压高于该二 维参考电压或三维参考电压时，通过输出端输出低电平信号而控制对应 LED串 201 中的 MOS管 Q截止， 从而进行过压保护。
由于该二维参考电压低于该三维参考电压， 从而能保证电子装置 100 工作在 二维模式时， 也能快速进行过压保护。
其中， 该 LED驱动单元 20还包括一控制端 21， 该背光控制电路 1还包括开 关单元 40。 该开关单元 40连接于该连接接口 C1的电源引脚 VP以及地之间， 该 LED驱动单元 20通过该控制端 21输出 PWM信号而控制该开关单元 40交替导通 截止，从而将该电源引脚 VP接入的电源电压 Vin转换为开关电源信号而为该 LED 模组 20供电。
在本实施方式中， 该开关单元 40为一 MOS管 Ql。 该 MOS管 Q1的栅极与 该 LED驱动单元 20的控制端 21连接，源极与该连接接口 C1的电源引脚 VP以及 该 LED模组 20的正极输入端 V+电连接， 漏极接地。
其中，在其他实施方式中，该 MOS管 Q以及 MOS管 Q1可为 NPN三极管代 替。
其中， 如图 1所示的背光控制电路 1 中还包括其他电路元件， 由于与本发明 主要改进无关， 故未加描述。
其中， 该电子装置 100可为手机、 平板电脑、 显示器或电视机等电子装置。 请参阅图 4, 为本发明一实施方式中显示面板驱动方法的流程图。 该显示面板 驱动方法用于电子装置 100工作在三维模式时， 控制该电子装置 100的 LED模组 2的发光和控制电子装置 100的显示屏 3进行左眼显示画面以及右眼显示画面的扫 描， 首先， 时序控制器 100在电子装置 100工作在三维模式时， 控制显示屏 3进 行左眼显示画面以及右眼显示画面的扫描（S401 )。
时序控制器 10在控制该左眼显示画面以及右眼显示画面的扫描进行切换后的 一小于该左眼显示画面或右眼显示画面的扫描时间 T的预定时间内， 控制该 LED 模组 2关闭而不发光（S402 )。 具体的， 该时序控制器 10控制该背光控制引脚 opl 输出具有第一电平的背光控制信号至该 LED模组 2, 而控制该 LED模组 2关闭而 不发光。
时序控制器 10并在控制该左眼显示画面以及右眼显示画面的扫描进行切换经 过该预定时间后， 控制该 LED模组 2发光直到该左眼显示画面或右眼显示画面的 扫描时间 T结束（ S403 )。 具体的， 时序控制器 10控制该背光控制引脚 opl输出 具有第二电平的背光控制信号至该 LED模组 2而控制该 LED模组 2发光。在第一 实施方式中， 该时序控制器 10控制显示屏 3在进行左眼显示画面以及右眼显示画 面扫描时的扫描频率为二维模式下扫描频率的 N倍； 在左眼显示画面与右眼显示 画面的扫描时间 T内重复扫描 N次左眼显示画面以及右眼显示画面； 以及在左眼 显示画面或右眼显示画面扫描了小于 N次的 M次后，输出背光控制信号至该 LED 模组 2， 控制该 LED模组 2发光直到该左眼显示画面或右眼显示画面的扫描时间 T结束。 在第二实施方式中， 该时序控制器 10控制在进行左眼显示画面以及右眼 显示画面扫描时的扫描频率为二维模式下的频率， 并在左眼显示画面或右眼显示 画面开始进行扫描经过该预定时间 T后， 输出具有第二电平的背光控制信号至该 LED模组 2, 控制该 LED模组 2发光直到该左眼显示画面或右眼显示画面的扫描 时间 T结束。
以上具体实施方式对本发明进行了详细的说明， 但这些并非构成对本发明的 限制。 本发明的保护范围并不以上述实施方式为限， 但凡本领域普通技术人员根 据本发明所揭示内容所作的等效修饰或变化， 皆应纳入权利要求书中记载的保护 范围内。

Claims

1、 一种背光控制电路， 用于驱动一电子装置中的 LED模组的发光， 包括时序控 制器以及 LED驱动单元， 该时钟控制器包括一显示信号输出引脚， 该时钟控制器 通过该显示信号输出引脚输出具有第一频率的显示画面信号至一显示屏而进行显 示画面的扫描而驱动显示屏进行显示； 其中：
该时序控制器还包括一背光控制引脚,该背光控制引脚与该 LED模组电连接， 其中， 在电子装置工作在三维模式时， 该时序控制器控制该左眼显示画面或右眼 显示画面的扫描进行切换时， 在小于该左眼显示画面或右眼显示画面的扫描时间 的预定时间之内， 控制该背光控制引脚输出具有第一电平的背光控制信号至该 LED模组， 而控制该 LED模组关闭而不发光； 该时序控制器并控制在左眼显示画 面以及右眼显示画面的扫描进行切换后经过该预定时间后， 控制该背光控制引脚 输出具有第二电平的背光控制信号至该 LED模组，而控制该 LED模组发光直到该 左眼显示画面或右眼显示画面的扫描时间结束。
2、 如权利要求 1所述的背光控制电路， 其中， 在电子装置工作在三维模式时， 该 时序控制器控制在进行左眼显示画面以及右眼显示画面扫描时的扫描频率为第二 频率， 其中第二频率为第一频率的 N倍， 从而， 在左眼显示画面与右眼显示画面 的扫描时间内重复扫描 N次左眼显示画面以及右眼显示画面； 该时序控制器并在 左眼显示画面或右眼显示画面扫描小于 N次的 M次之内输出具有该第一电平的背 光控制信号至该 LED模组而控制 LED模组关闭不发光,并在左眼显示画面或右眼 显示画面扫描经过该 M次后，输出具有该第二电平的背光控制信号至该 LED模组， 控制该 LED模组发光， 直到该左眼显示画面或右眼显示画面的扫描时间结束。
3、 如权利要求 1所述的背光控制电路， 其中， 该时序控制器控制在进行左眼显示 画面以及右眼显示画面扫描时的扫描频率为第一频率 , 该时序控制器并在左眼显 示画面或右眼显示画面开始进行扫描的预定时间内， 控制输出具有第一电平的背 光控制信号至该 LED模组而控制 LED模组关闭不发光,并在左眼显示画面或右眼 显示画面开始进行扫描经过该预定时间后， 输出具有该第二电平的背光控制信号 至该 LED模组，控制该 LED模组发光，直到该左眼显示画面或右眼显示画面的扫 描时间结束。
4、 如权利要求 1所述的背光控制电路， 其中， 该 LED模组包括正极输入端以及 并联于该正极输入端以及地之间的多个 LED串，每一 LED串包括串联于正极输入 端以及地之间的若干 LED灯以及一 MOS管， 该时序控制器的背光控制引脚与该 每一 LED串的 MOS管的栅极连接， 该时序控制器控制背光控制引脚输出具有第 一电平的背光控制信号时， 而控制所有 LED 串的 NMOS管截止， 从而控制 LED 模组不发光； 该时序控制器控制背光控制引脚输出具有第二电平的背光控制信号 至所有 LED串的 MOS管而控制所有 LED串的 NMOS管导通， 从而控制 LED模 组发光。
5、 如权利要求 1所述的背光控制电路， 其中， 该 LED模组的所有 LED灯的控制 时序相同。
6、 一种电子装置， 包括一 LED模组、 一显示屏以及一背光控制电路， 该背光控 制电路，用于驱动一电子装置中的 LED模组的发光， 包括时序控制器以及 LED驱 动单元， 该时钟控制器包括一显示信号输出引脚， 该时钟控制器通过该显示信号 输出引脚输出具有第一频率的显示画面信号至一显示屏而进行显示画面的扫描而 驱动显示屏进行显示； 其中：
该时序控制器还包括一背光控制引脚,该背光控制引脚与该 LED模组电连接， 其中， 在电子装置工作在三维模式时， 该时序控制器控制该左眼显示画面或右眼 显示画面的扫描进行切换时， 在小于该左眼显示画面或右眼显示画面的扫描时间 的预定时间之内， 控制该背光控制引脚输出具有第一电平的背光控制信号至该 LED模组， 而控制该 LED模组关闭而不发光； 该时序控制器并控制在左眼显示画 面以及右眼显示画面的扫描进行切换后经过该预定时间后， 控制该背光控制引脚 输出具有第二电平的背光控制信号至该 LED模组，而控制该 LED模组发光直到该 左眼显示画面或右眼显示画面的扫描时间结束。
7、 如权利要求 6所述的电子装置， 其中， 在电子装置工作在三维模式时， 该时序 控制器控制在进行左眼显示画面以及右眼显示画面扫描时的扫描频率为第二频 率， 其中第二频率为第一频率的 N倍， 从而， 在左眼显示画面与右眼显示画面的 扫描时间内重复扫描 N次左眼显示画面以及右眼显示画面； 该时序控制器并在左 眼显示画面或右眼显示画面扫描小于 N次的 M次之内输出具有该第一电平的背光 控制信号至该 LED模组而控制 LED模组关闭不发光，并在左眼显示画面或右眼显 示画面扫描经过该 M次后， 输出具有该第二电平的背光控制信号至该 LED模组， 控制该 LED模组发光， 直到该左眼显示画面或右眼显示画面的扫描时间结束。
8、 如权利要求 6所述的电子装置， 其中， 该时序控制器控制在进行左眼显示画面 以及右眼显示画面扫描时的扫描频率为第一频率， 该时序控制器并在左眼显示画 面或右眼显示画面开始进行扫描的预定时间内， 控制输出具有第一电平的背光控 制信号至该 LED模组而控制 LED模组关闭不发光，并在左眼显示画面或右眼显示 画面开始进行扫描经过该预定时间后， 输出具有该第二电平的背光控制信号至该 LED模组， 控制该 LED模组发光， 直到该左眼显示画面或右眼显示画面的扫描时 间结束。
9、 如权利要求 6所述的电子装置， 其中， 该 LED模组包括正极输入端以及并联 于该正极输入端以及地之间的多个 LED串，每一 LED串包括串联于正极输入端以 及地之间的若干 LED灯以及一 MOS管， 该时序控制器的背光控制引脚与该每一 LED串的 MOS管的栅极连接，该时序控制器控制背光控制引脚输出具有第一电平 的背光控制信号时， 而控制所有 LED串的 NMOS管截止， 从而控制 LED模组不 发光； 该时序控制器控制背光控制引脚输出具有第二电平的背光控制信号至所有 LED串的 MOS管而控制所有 LED串的 NMOS管导通，从而控制 LED模组发光。
10、 一种显示面板驱动方法， 用于在一电子装置工作在三维模式时， 控制该电子 装置的 LED模组的发光和控制电子装置的显示屏进行左眼显示画面以及右眼显示 画面的扫描， 其中， 所述方法包括步驟：
在该左眼显示画面以及右眼显示画面的扫描进行切换后的小于该左眼显示画 面或右眼显示画面的扫描时间的预定时间内， 控制该 LED模组关闭而不发光； 以 及
在该左眼显示画面以及右眼显示画面的扫描进行切换后经过该预定时间后， 控制该 LED模组发光。
11、 如权利要求 10所述的方法， 其中， 该 LED模组内的所有 LED灯的控制时序 是同步的。
12、 如权利要求 10所述的方法， 其中， 该步骤 "在该左眼显示画面以及右眼显示 画面的扫描进行切换后经过该预定时间后， 控制该 LED模组发光" 为：
控制在进行左眼显示画面以及右眼显示画面扫描时的扫描频率为二维模式下 扫描频率的 N倍；
在左眼显示画面与右眼显示画面的扫描时间内重复扫描 N次左眼显示画面以 及右眼显示画面； 以及
在左眼显示画面或右眼显示画面扫描了小于 N次的 M次时， 控制该 LED模 组发光直到该左眼显示画面或右眼显示画面的扫描时间结束。
13、 如权利要求 10所述的方法， 其中， 该步骤 "控制该左眼显示画面以及右眼显 示画面的扫描进行切换后经过该预定时间后， 控制该 LED模组发光" 为：
控制在进行左眼显示画面以及右眼显示画面扫描时的扫描频率为二维模式下 的频率； 以及
在左眼显示画面或右眼显示画面开始进行扫描经过该预定时间后， 控制该 LED模组发光直到该左眼显示画面或右眼显示画面的扫描时间结束。
PCT/CN2014/070791 2013-12-17 2014-01-17 背光控制电路、电子装置及显示面板驱动方法 Ceased WO2015089926A1 (zh)

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