WO2013155809A1 - 背光驱动电压控制装置、背光驱动电压控制方法、电视机、机器可读程序及其存储介质 - Google Patents

背光驱动电压控制装置、背光驱动电压控制方法、电视机、机器可读程序及其存储介质 Download PDF

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Publication number
WO2013155809A1
WO2013155809A1 PCT/CN2012/079534 CN2012079534W WO2013155809A1 WO 2013155809 A1 WO2013155809 A1 WO 2013155809A1 CN 2012079534 W CN2012079534 W CN 2012079534W WO 2013155809 A1 WO2013155809 A1 WO 2013155809A1
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WO
WIPO (PCT)
Prior art keywords
voltage
light string
string
adjustment amount
voltage adjustment
Prior art date
Application number
PCT/CN2012/079534
Other languages
English (en)
French (fr)
Inventor
庞震华
辛晓光
徐爱臣
乔明胜
Original Assignee
青岛海信信芯科技有限公司
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 青岛海信信芯科技有限公司 filed Critical 青岛海信信芯科技有限公司
Priority to EP12864017.4A priority Critical patent/EP2674936A4/en
Publication of WO2013155809A1 publication Critical patent/WO2013155809A1/zh

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Classifications

    • 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
    • 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
    • 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
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/04—Display protection
    • G09G2330/045—Protection against panel overheating
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen

Definitions

  • Backlight driving voltage control device backlight driving voltage control method, television set, machine readable program and storage medium thereof
  • the present invention relates to the field of backlight control technology, and in particular, to a backlight driving voltage control device, a television, a backlight driving voltage control method, a machine readable program, and a storage medium thereof.
  • the backlight has a very large effect on the display of the entire screen.
  • the direct-type multi-partition back light source can separately modulate the light intensity for each partition, so that the image can be better displayed with the image, for example, generally, higher contrast and less power consumption are obtained. In theory, the more the backlight area is divided, the greater the reduction in contrast and power consumption.
  • the AC to DC converter plus DC to DC converter plus constant current control chip architecture the efficiency of the entire system is greatly reduced due to the increase in the number of voltage conversions. Moreover, the huge circuit system makes the whole circuit hardware very complicated, and the occupied TV space is huge, which greatly affects the appearance of the TV.
  • the inventors proposed an architecture of an AC-DC plus constant current control chip.
  • this architecture the voltage conversion of the DC to DC converter can be reduced, thereby reducing a large number of hardware devices and increasing system efficiency.
  • the cost and footprint of multiple AC to DC converters is relatively large, so in the present invention an AC to DC converter will be used corresponding to all LED strings. method. How to ensure the stable working state of all LED strings is an urgent problem to be solved.
  • the forward voltage of the current LED lamp at the rated current will float within a certain range.
  • the forward conduction voltage is between 2.8 and 3.6V
  • the center voltage is 3.0. V. Therefore, the voltage difference between the LED strings will theoretically vary greatly.
  • the maximum voltage and minimum voltage of the LED string are 14.4V and 11.2V, respectively, under rated current.
  • the center voltage is 12V.
  • the output voltage of the AC to DC converter is increased to 14.4V in order to ensure that all of the theoretical strips are operated at rated current. Still more Higher, taking into account the pressure drop across the constant current source).
  • the constant current control chip on the LED string with a center voltage of 12V will withstand a voltage difference loss voltage of 2.4V. This part of the voltage is completely converted into heat loss, and this part of the heat is dissipated into the system.
  • the heat loss of the system is quite large. Taking 1000 strings, 4 lamps as a series of backlights with a current of 20 mA as an example, the center value of the heat loss is 48 W, and the actual power consumption of the lamp is 240 W. Therefore, this will greatly reduce the efficiency of the system, and will cause the entire system to generate a large amount of heat, posing considerable risks.
  • the reliability of the system is increased.
  • the LED string of the current backlight system is adaptively compensated so that all LED strings of the entire LED backlight system operate at rated current.
  • the probability that a string of LED strings is much higher than 12V is greatly increased.
  • the reliability of this adaptive voltage method is greatly discounted.
  • a backlight driving voltage control apparatus including: a detecting unit connected to a controller, detecting a current state of a light string of each partition of a backlight of the liquid crystal screen, and controlling the current state according to the current state Transmitting a feedback signal, and after receiving the shutdown feedback control signal from the controller, not transmitting a feedback signal corresponding to the light string selected by the controller and having a voltage adjustment amount greater than a threshold;
  • the controller is connected to the AC to DC converter, sends a voltage adjustment control signal to the AC to DC converter according to the feedback signal, and acquires a voltage adjustment amount of each light string according to the voltage adjustment control signal, Selecting a light string whose voltage adjustment amount is greater than a threshold, and transmitting the shutdown feedback control signal to the detecting unit; the AC to DC converter outputting a corresponding voltage to the light string according to the voltage adjustment control signal, so that The string operates at a rated current.
  • the backlight driving voltage control device can sequentially adjust the input according to the feedback signal of each of the partition light strings.
  • the voltage of the string if the voltage of the LED string is too high, the feedback signal is reduced, and the voltage output from the AC-DC converter becomes smaller. Conversely, if the voltage of the LED string is insufficient, the feedback signal is increased from AC- The voltage outputted by the DC converter becomes larger, thereby adjusting the voltage input to the string, and traversing all the strings, so that the voltage adjustment amount of each string can be obtained, and then the voltage adjustment amount is selected to be greater than the threshold. Light string, these selected light strings will cause instability of the system.
  • the feedback signals of these strings can be turned off, and the feedback signal of the remaining string can be turned on, so that the remaining strings can be voltage-driven.
  • the adaptive adjustment makes it work at rated current, which enables the selection of reliability data and greatly reduces the reliability risk caused by the voltage deviation of the string.
  • the detecting unit may include at least one constant current control chip and a collecting circuit, wherein the at least one constant current controlling chip controls a current state of the light string, and the set a circuit connected between the controller and the at least one constant current control chip, collecting voltage data of the light string and transmitting to the controller, the controller generating the voltage adjustment according to the voltage data control signal.
  • the constant current control chip may be one or more, corresponding to a plurality of LED lamp partitions respectively, and can provide a feedback signal according to the current state of the light string.
  • the constant current control chip here refers to a comprehensive constant current source and
  • the collector circuit can collect corresponding voltage data according to the feedback signal to the controller.
  • the method further includes: a memory, storing an address of the light string selected by the controller and having a voltage adjustment amount greater than a threshold, and the controller reads from the memory when the power is turned on next time
  • the voltage adjustment amount of the string selects a light string whose voltage adjustment amount is greater than a threshold according to the stored voltage adjustment amount of each light string.
  • the memory can store data used by the controller, for example, traversing the detected voltage adjustment amount of each light string, and selecting the address of the light string whose voltage adjustment amount is greater than the threshold.
  • the constant current control chip may include a register, and save data of a feedback switch that controls the light string, and set a feedback switch of the corresponding light string according to the address sent by the controller. Off, the feedback of the corresponding string is turned off.
  • the switch of the light string can be controlled by the register in the constant current control chip. For example, 1 means open and 0 means off. If you want to turn off the feedback of a light string, set the register data to 0.
  • the method further includes: a controlled current source connected to the collector circuit and Between the constant current control chips, the constant current control chip applies a voltage of the light string to the controlled current source, and when the voltage of the light string is insufficient, the current of the controlled current source increases.
  • the voltage of the collector circuit is reduced; when the voltage of the string is too high, the current of the controlled current source is decreased, and the voltage collected by the collector circuit is increased.
  • the controlled current source is a way of feeding back the signal of the constant current control chip, which is called current feedback type.
  • the constant current control chip applies the voltage of the LED string to the controlled power source.
  • the voltage detected by the controller drops (the voltage detected by the collector circuit is given to the controller), that is, the signal fed back to the controller is that the voltage of the LED string is insufficient, and conversely, when the LED string is When the voltage is too high, the current of the controlled current source decreases, and the voltage detected at the controller increases, that is, the signal fed back to the controller is that the voltage of the LED string is too high.
  • a diode may be further connected between the collector circuit and the constant current control chip, and the constant current control chip outputs a high level and a low level according to the voltage of the light bar.
  • the constant current control chip outputs a high level and a low level according to the voltage of the light bar.
  • the diode is another way of controlling the feedback signal of the constant current control chip, which is called voltage feedback type.
  • the controller is further configured to calculate, according to the preset ratio, the number of the light strings having the voltage adjustment amount greater than the threshold, so that the detecting unit turns off the voltage corresponding to the quantity A feedback of a string of lights that is greater than a threshold.
  • the preset ratio it is appropriate to select how many LED strings are selected for one system. According to the calculation result, a specific number of light strings with voltage regulation greater than the threshold are selected to further improve the system reliability.
  • the controller may include a field programmable gate array (FPGA) and a single chip microcomputer.
  • FPGA field programmable gate array
  • Another object of the present invention is to provide a television set having the same technical effects as the backlight driving voltage control device.
  • a television set comprising the backlight driving voltage control device as described in any of the above aspects.
  • Another object of the present invention is to provide a backlight driving voltage control method, which increases reliability data selection and improves system reliability.
  • a backlight driving voltage control method including the following steps: Detecting a current state of a light string of each partition of the backlight of the liquid crystal screen, controlling a voltage input to the light string according to the feedback information of the current state; obtaining a voltage adjustment amount of each light string, and selecting a voltage adjustment amount greater than a threshold value Light string; during the next operation, feedback of the current state of the remaining light string is performed, and the voltage input to the light string of each zone is adjusted according to the current state of the remaining light string, and the remaining light string is controlled to operate under the rated current
  • the remaining light string is a light string of the partitions minus a light string whose voltage adjustment amount is greater than a threshold.
  • the voltage input to the string is adjusted according to the feedback signal of each partition string. If the LED string voltage is too high, the feedback signal is reduced, and the voltage output to the string is reduced. Conversely, if the LED string voltage is If the signal is insufficient, the feedback signal increases, and the voltage output to the string becomes larger, thereby adjusting the voltage input to the string, and traversing all the strings, so that the voltage adjustment amount of each string can be obtained, and then Selecting the light string whose voltage adjustment amount is greater than the threshold value, these selected light strings may cause instability of the system. Therefore, when the liquid crystal screen is working normally, the feedback signals of the light strings can be turned off, and the feedback signal of the remaining light string is turned on. The remaining lamp string can be adaptively adjusted to operate at the rated current, thus enabling the selection of reliability data and greatly reducing the reliability risk caused by the voltage deviation of the lamp string to the entire system.
  • the detecting a current state of the light string of each partition of the backlight of the liquid crystal panel, and controlling the voltage input to the light string according to the feedback information of the current state specifically includes: controlling the The current state of the light string generates feedback information according to the current state, and after generating the feedback information, the voltage data of the light string is collected, and the voltage input to the light string is adjusted according to the voltage data.
  • the step of acquiring a voltage adjustment amount of each light string and selecting a light string whose voltage adjustment amount is greater than a threshold further comprises: saving an address of the light string whose selected voltage adjustment amount is greater than a threshold Reading the address of the light string whose voltage adjustment amount is greater than the threshold value during the next operation, and turning off the feedback of the light string whose voltage adjustment amount is greater than the threshold according to the address command; saving the acquired voltage of each light string The adjustment amount is selected according to the stored voltage adjustment amount of each light string to select a light string whose voltage adjustment amount is greater than the threshold value.
  • the number of the light strings having the voltage adjustment amount greater than the threshold value is calculated according to the preset ratio, and the feedback corresponding to the number of the light strings having the voltage adjustment amount greater than the threshold value is turned off.
  • the preset ratio it is suitable to select how many LED strings are selected for one system. According to the calculation result, a specific number of light strings with a voltage adjustment amount greater than the threshold is selected, which further improves the reliability of the system.
  • the lamp string when the lamp string is operated at the rated current, the voltage adjustment amount of each lamp string is traversed, and the light string whose voltage adjustment amount is greater than the threshold value is selected according to the data, and the lamps are simultaneously The address of the string is saved.
  • the address of these strings is read, the current feedback function of these strings is turned off, and the feedback function of the remaining strings is turned on, and the output voltage is modulated according to the feedback signal.
  • the remaining lamp string is operated at the rated current, the heat loss caused by the lamp string whose voltage adjustment amount is greater than the threshold value is avoided, the reliability of the system is ensured, and the adaptive backlight voltage control is also realized.
  • the present invention also provides a program product stored on a non-transitory machine readable medium for backlight driving voltage control, the program product comprising machine executable instructions for causing a computer system to perform the steps of: detecting liquid crystal a current state of the light string of each partition of the screen backlight, controlling a voltage input to the light string according to the feedback information of the current state; obtaining a voltage adjustment amount of each light string, and selecting a light string whose voltage adjustment amount is greater than a threshold During the next operation, feedback of the current state of the remaining light string is performed, and the voltage input to the light string of each zone is adjusted according to the current state of the remaining light string, and the remaining light string is controlled to operate at a rated current, wherein And the remaining light string is a light string of the each partition minus a light string whose voltage adjustment amount is greater than a threshold.
  • the present invention also provides a non-volatile machine readable medium storing a program product for backlight driving voltage control, the program product comprising machine executable instructions for causing a computer system to perform the steps of: detecting a liquid crystal backlight a current state of the light string of each partition, controlling a voltage input to the light string according to the feedback information of the current state; obtaining a voltage adjustment amount of each light string, and selecting a light string whose voltage adjustment amount is greater than a threshold; During operation, feedback of the current state of the remaining light string is performed, and the voltage input to the light string of each zone is adjusted according to the current state of the remaining light string, and the remaining light string is controlled to operate at a rated current, wherein The remaining light string is a light string of the respective zones minus a light string whose voltage adjustment amount is greater than a threshold.
  • the present invention also provides a machine readable program, the program causing a machine to execute the backlight driving voltage control method according to any one of the above aspects.
  • the present invention also provides a storage medium storing a machine readable program, wherein the machine readable program causes the machine to execute the backlight driving voltage control method according to any one of the above aspects.
  • FIG. 1 is a block diagram showing a backlight driving voltage control device according to an embodiment of the present invention
  • FIG. 2 is a block diagram showing a backlight driving voltage control device according to still another embodiment of the present invention
  • FIG. 4 is a flow chart showing a backlight driving voltage control method according to an embodiment of the present invention.
  • FIG. Fig. 1 is a block diagram showing a backlight driving voltage control device according to an embodiment of the present invention.
  • a backlight driving voltage control apparatus 100 includes: a detecting unit 102 connected to the controller 104, detecting a current state of a light string A of each partition of a backlight of the liquid crystal screen, according to the current The state sends a feedback signal to the controller 104, and after receiving the shutdown feedback control signal from the controller 104, does not send the voltage adjustment amount selected by the controller 104 to the controller 104 that is greater than a threshold.
  • the controller 104 connected to the AC to DC converter 106, transmitting a voltage adjustment control signal to the AC to DC converter 106 according to the feedback signal, and according to the voltage Adjusting the control signal to obtain the voltage adjustment amount of each light string A, picking up the light string A whose voltage adjustment amount is greater than the threshold value, and transmitting the close feedback control signal to the detecting unit 102; the AC to DC converter 106 is based on The voltage regulation control signal outputs a corresponding voltage to the string A to operate the string A at a rated current.
  • the backlight driving voltage control device can sequentially adjust the voltage input to the light string according to the feedback signal of each of the partition light strings. If the LED light string voltage is too high, the feedback signal is reduced, and the voltage output from the AC-DC converter is If the voltage of the LED string is insufficient, the feedback signal increases, and the voltage output from the AC-DC converter becomes larger, thereby adjusting the voltage input to the string, and detecting the traversal of all the strings. Therefore, the voltage adjustment amount of each light string can be obtained, and then the light string whose voltage adjustment amount is greater than the threshold value is selected, and the selected light string causes instability of the system, so when the liquid crystal screen works normally, the lights can be turned off.
  • the feedback signal of the string turns on the feedback signal of the remaining string, so that the remaining string can be adaptively adjusted to operate at the rated current, so that the reliability data can be selected and the voltage of the string can be greatly reduced.
  • the detecting unit 102 may include at least one constant current controlling chip 1022 and a collecting circuit 1024, wherein the at least one constant current controlling chip 1022 controls a current state of the light string A,
  • the collector circuit 1024 is connected between the controller 104 and the at least one constant current control chip 1022, and collects voltage data of the string A and transmits the voltage data to the controller 104.
  • the controller 104 The voltage adjustment control signal is generated based on the voltage data.
  • the constant current control chip 1022 may be one or more, corresponding to a plurality of LED lamp partitions respectively, and can provide a feedback signal according to the current state of the light string A.
  • the constant current control chip 1022 refers to a comprehensive constant here. Circuits for current source and current control and signal feedback, in order to simplify the circuit, package these circuits Inside an IC, it is referred to herein as a constant current control chip.
  • the gather circuit can then collect corresponding voltage data to the controller 104 according to the feedback signal.
  • a backlight driving voltage control apparatus will be described in detail below with reference to Figs. 2 to 3.
  • a specific example of a backlight driving voltage control device including a controller 104, an AC to DC converter 106, and a collector circuit 1024 and a constant current control chip 1022 is shown.
  • the constant current control chip 1022 applies the voltage of the LED light bar to a controlled current source 204.
  • the voltage detected by the controller 104 decreases.
  • a voltage adjustment control signal is sent to the AC to DC converter 106, and when the AC to DC converter 106 receives the voltage regulation control signal, the voltage input to the anode of the LED is boosted.
  • the voltage adjustment control signal is sent to the AC to DC converter 106, AC to When receiving the voltage adjustment control signal, the DC converter 106 reduces the voltage input to the anode of the LED.
  • the backlight driving voltage control device in this embodiment may further include: a memory 108, the address of the light string selected by the controller 104 for selecting a voltage adjustment amount greater than a threshold, and the controller 104 reads from the memory 108 when the power is turned on next time.
  • the voltage adjustment amount of the light string is selected according to the stored voltage adjustment amount of each light string to select a light string whose voltage adjustment amount is greater than the threshold value.
  • the memory 108 can store the data used by the controller 104, for example, traversing the detected voltage adjustment amount of each of the lamp strings, and the address of the selected light string whose voltage adjustment amount is larger than the threshold.
  • One of the preferred methods is to use the special register in the constant current control chip 1022 to save the switch data of each light string, and send according to the controller 104.
  • the address of the corresponding string is set to off, and the feedback of the corresponding string is turned off. For example, 1 means open, 0 means off, if you want to turn off the feedback of a string, set the register data to 0.
  • the backlight driving voltage control device in this embodiment may further include: a controlled current source 204 connected between the collector circuit 1024 and the constant current control chip 1022, wherein the constant current control chip 1022 will The voltage of the string acts on the controlled current source 204.
  • a controlled current source 204 connected between the collector circuit 1024 and the constant current control chip 1022, wherein the constant current control chip 1022 will The voltage of the string acts on the controlled current source 204.
  • the voltage of the string is insufficient, the current of the controlled current source 204 increases, and the voltage collected by the collector circuit 1024 decreases;
  • the voltage of the string is too high, the current of the controlled current source 204 decreases, and the voltage collected by the collector circuit 1024 increases.
  • the application of the controlled current source 204 is a way for the constant current control chip 1022 to feed back a signal, which is called a current feedback type.
  • the constant current control chip applies a voltage of the LED string to the controlled power source, when the voltage of the LED string is Lack of
  • the voltage detected by the controller 104 decreases (the voltage detected by the collector circuit is given to the controller 104), so the signal fed back to the controller 104 is that the voltage of the LED string is insufficient, and vice versa.
  • the voltage of the LED string is too high, the current of the controlled current source decreases, and the voltage detected at the controller 104 increases, so the signal fed back to the controller 104 is that the voltage of the LED string is too high.
  • FIG. 3 illustrates another specific example of a backlight driving voltage control device, which in this example also has a controller 104, an AC to DC converter 106, and a memory 108.
  • the functions of these components are the same as those of the corresponding components in the above embodiments.
  • the difference is that the feedback mode of the constant current control chip 1022 is a voltage output type, and the constant current control chip 1022 outputs a high and low voltage according to the voltage of the LED light bar.
  • the diode 202 is connected between the collector circuit 1024 and the constant current control chip 1022.
  • the constant current control chip 1022 outputs a high level and a low level according to the voltage of the light bar.
  • the voltage collecting circuit 1022 can be used as the circuit shown in FIG. 3, and for the current feedback type of the constant current control chip, the voltage collecting circuit 1022 can be used as the circuit shown in FIG. 2.
  • the voltage collecting circuit 1022 is only a state correspondence, where the voltage collecting circuit 1022 sends the controller 104 a state corresponding value.
  • the operation mode of the constant current control chip 1022 is specifically described as follows: Since all the light bars share an anode voltage, for each constant current source, if it is to be accurate For current control, the transistor or MOS transistor in the constant current source must be operated in an amplified state instead of a saturated state, so the anode voltage needs to be increased to a certain extent. How to determine the magnitude of the anode voltage, which requires a feedback signal to control the voltage rise. If the anode voltage is insufficient and the feedback signal feedback increases, the voltage rises. If the anode voltage is too high, the feedback signal decreases and the voltage drops, thus forming a closed loop.
  • the feedback signal can be based on the collector voltage feedback of the triode or the base current feedback of the triode. For MOS transistors, it depends on the gate voltage or the drain voltage feedback. If the triode current is insufficient, the base current increases to the maximum, and the collector voltage drops to a minimum. At this time, the feedback increases and the voltage rises. Similarly, for the MOS transistor, if the current of the MOS transistor is insufficient, the gate voltage is the largest and the drain voltage is the lowest. At this time, the feedback is increased and the voltage is increased. The above process is completed inside the constant current control chip 1022.
  • the controller 104 is further configured to calculate, according to a preset ratio, a number of light strings that have a voltage adjustment amount greater than a threshold, so that the detecting unit 102 closes the number corresponding to the quantity. Feedback of a string of voltage adjustments greater than a threshold.
  • the controller operates the adaptive backlight voltage control by operating the remaining LED string at the rated current according to the voltage value of the voltage collecting circuit.
  • controller 104 in the above embodiments may include a field programmable gate array (FPGA) and a single chip microcomputer.
  • FPGA field programmable gate array
  • the FPGA can perform RC filtering on a PWM signal to obtain a high-low level signal to affect the feedback loop of the AC-DC, thereby achieving control of the output voltage.
  • the backlight driving voltage control device first traverses and detects the voltage adjustment amount of each light string while operating the light string at the rated current, and selects a light string whose voltage adjustment amount is greater than the threshold according to the data, and simultaneously The addresses of these strings are saved.
  • the address of these strings is read, the current feedback function of these strings is turned off, and the feedback function of the remaining strings is turned on, and the output voltage is modulated according to the feedback signal, so that the remaining strings operate at At rated current, the heat loss caused by the string of voltage regulation greater than the threshold is also avoided, which ensures the reliability of the system and also realizes adaptive backlight voltage control.
  • a television set comprising the backlight driving voltage control device as described in any of the above aspects.
  • FIG. 4 shows a schematic diagram of a backlight driving voltage control method according to an embodiment of the present invention.
  • a backlight driving voltage control method includes the following steps: Step 402: Detect a current state of a light string of each partition of a backlight of a liquid crystal screen, and control input to a light according to feedback information of a current state.
  • Step 404 obtaining a voltage adjustment amount of each light string, and selecting a light string whose voltage adjustment amount is greater than a threshold value; Step 406, performing feedback of current state of the remaining light string during the next operation, according to the remaining light
  • the current state of the string adjusts the voltage input to the light string of each zone, and controls the remaining light string to operate at the rated current, wherein the remaining light string is a string of lights of each zone minus a light string whose voltage adjustment amount is greater than a threshold.
  • the voltage input to the string is adjusted according to the feedback signal of each partition string. If the LED string voltage is too high, the feedback signal is reduced, and the voltage output to the string is reduced. Conversely, if the LED string voltage is insufficient, Then, the feedback signal is increased, and the voltage output to the string is increased, thereby adjusting the voltage input to the string, and traversing all the strings, so that the voltage adjustment amount of each string can be obtained, and then selected. If the voltage adjustment is greater than the threshold, these selected strings will cause instability of the system.
  • the feedback signals of these strings can be turned off, and the feedback signal of the remaining strings can be turned on to make the remaining
  • the string can be adaptively adjusted to operate at rated current, thus enabling the selection of reliability data and greatly reducing the reliability risk caused by the voltage deviation of the string.
  • the step 402 specifically includes: controlling a current state of the light string, generating feedback information according to the current state, collecting feedback voltage information, collecting voltage data of the light string, and adjusting the input signal to the light according to the voltage data.
  • the voltage of the string preferably, the step 402 specifically includes: controlling a current state of the light string, generating feedback information according to the current state, collecting feedback voltage information, collecting voltage data of the light string, and adjusting the input signal to the light according to the voltage data. The voltage of the string.
  • the step 404 may further include: saving an address of the selected light string whose voltage adjustment amount is greater than a threshold, and reading an address of the light string whose voltage adjustment amount is greater than the threshold during the next operation, The feedback of the light string whose voltage adjustment amount is greater than the threshold is turned off according to the address command; the obtained voltage adjustment amount of each light string is saved, and the light string whose voltage adjustment amount is greater than the threshold value is selected according to the stored voltage adjustment amount of each light string.
  • the number of the lamp strings having the voltage adjustment amount greater than the threshold value is calculated according to the preset ratio, and the feedback of the lamp string having the voltage adjustment amount greater than the threshold corresponding to the number is turned off.
  • the preset ratio it is suitable to select how many LED strings are selected for one system. According to the calculation result, a specific number of light strings with a voltage adjustment amount greater than the threshold is selected, which further improves the reliability of the system.
  • the lamp string is operated at the rated current, the voltage adjustment amount of each lamp string is traversed, and the voltage adjustment amount is selected based on the data.
  • the string of lights at the same time save the address of these strings.
  • the address of these strings is read, the current feedback function of these strings is turned off, and the feedback function of the remaining strings is turned on, and the output voltage is modulated according to the feedback signal, so that the remaining strings operate at At rated current, the heat loss caused by the string of voltage regulation greater than the threshold is also avoided, which ensures the reliability of the system and also realizes adaptive backlight voltage control.
  • the present invention also provides a program product stored on a non-transitory machine readable medium for backlight driving voltage control, the program product comprising machine executable instructions for causing a computer system to perform the steps of: detecting liquid crystal a current state of the light string of each partition of the screen backlight, controlling a voltage input to the light string according to the feedback information of the current state; obtaining a voltage adjustment amount of each light string, and selecting a light string whose voltage adjustment amount is greater than a threshold During the next operation, feedback of the current state of the remaining light string is performed, and the voltage input to the light string of each zone is adjusted according to the current state of the remaining light string, and the remaining light string is controlled to operate at a rated current, wherein , said The remaining light string is a light string of the respective zones minus a light string whose voltage adjustment amount is greater than a threshold.
  • the present invention also provides a non-volatile machine readable medium storing a program product for backlight driving voltage control, the program product comprising machine executable instructions for causing a computer system to perform the steps of: detecting a liquid crystal backlight a current state of the light string of each partition, controlling a voltage input to the light string according to the feedback information of the current state; obtaining a voltage adjustment amount of each light string, and selecting a light string whose voltage adjustment amount is greater than a threshold; During operation, feedback of the current state of the remaining light string is performed, and the voltage input to the light string of each zone is adjusted according to the current state of the remaining light string, and the remaining light string is controlled to operate at a rated current, wherein The remaining light string is a light string of the respective zones minus a light string whose voltage adjustment amount is greater than a threshold.
  • the present invention also provides a machine readable program, the program causing a machine to execute the backlight driving voltage control method according to any one of the above aspects.
  • the present invention also provides a storage medium storing a readable program of a machine, wherein the machine readable program causes the machine to execute the backlight driving voltage control method according to any one of the above aspects.
  • the terms “installation”, “connected”, “connected”, “fixed” and the like are to be understood broadly, and may be either a fixed connection or a detachable connection, unless otherwise explicitly stated and defined. , or connected integrally; can be mechanical or electrical; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of the two components.
  • installation can be understood on a case-by-case basis.

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Abstract

一种背光驱动电压控制装置（100）、背光驱动电压控制方法、电视机、机器可读程序及其存储介质。背光驱动电压控制装置（100）包括：检测单元（102），连接至控制器（104），检测液晶屏背光源各分区的灯串（A）的电流状态，根据电流状态向控制器（104）发送反馈信号，在接收到关闭反馈控制信号时，不向控制器（104）发送与控制器（104）挑选出的电压调节量大于阈值的灯串（A）相对应的反馈信号；控制器（104），根据反馈信号向AC到DC转换器（106）发送电压调节控制信号，根据电压调节控制信号获取每个灯串（A）的电压调节量，挑选出电压调节量大于阈值的灯串（A），并向检测单元（102）发送关闭反馈控制信号；AC到DC转换器（106），根据电压调节控制信号向灯串（A）输出相应的电压，使灯串（A）工作在额定电流下。经过可靠性数据选择的自适应控制，灯串（A）的电压偏差给整个电路系统所造成的可靠性风险减少。

Description

说 明 书 背光驱动电压控制装置、 背光驱动电压控制方法、 电视机、 机器可读程序及 其存储介质 技术领域
本发明涉及背光源控制技术领域， 具体而言， 涉及背光驱动电压控制装置、 电视 机、 背光驱动电压控制方法、 机器可读程序及其存储介质。
背景技术
在液晶显示屏中， 背光源对整个画面的显示有非常大的影响。 直下式多分区的背 光源由于其每个分区可单独调制光强， 因此可以配合图像得到更好的画面显示效果， 例如一般会得到较高的对比度和减少较多的功耗。 从理论上讲， 背光区域分区越多， 这种对比度和功耗上的减少就越大。
目前液晶电视机的背光源多为 100 - 500个区左右。 就整个电路系统来讲， 传统的
AC到 DC转换器加 DC到 DC转换器加恒流控制芯片的架构， 由于其电压转换次数增 加而使整个系统的效率大大降低。 而且庞大的电路系统使得整个电路硬件非常复杂， 占用的电视空间巨大， 大大影响了电视的外观造型。
为解决上述问题， 发明人提出了 AC-DC加恒流控制芯片的架构。 釆用这种架构， 可以减少 DC到 DC转换器这一电压转换环节， 从而减少了大量的硬件器件， 也增加了 系统效率。 然而， 由于 AC到 DC转换器的架构和成本限制， 多个 AC到 DC转换器的 成本和占用空间相对较大，因此在本发明中将釆用一个 AC到 DC转换器对应全部 LED 灯串的方法。而如何保证全部的 LED灯串的工作状态稳定，又是一个急需解决的问题。
由于工艺的影响， 目前的 LED灯在额定电流下的正向电压会在一定范围内浮动， 以某一种灯为例， 其正向的导通电压在 2.8 ~ 3.6V之间， 中心电压 3.0V。 因此 LED灯 串之间的电压差在理论上会有很大偏差。 以 4颗灯为一串为例， 该 LED灯串在额定电 流的状态下， 最大电压和最小电压分别为 14.4V 和 11.2V。 中心电压 12V。
在釆用 AC到 DC转换器这种架构的情况下，假如为保证理论上的全部灯条都要工 作在额定电流下， 那么就要将 AC到 DC转换器的输出电压提高到 14.4V (实际上还要 高一点， 考虑到恒流源上的压降） 。 在这种情况下， 中心电压为 12V的 LED灯串上的 恒流控制芯片将会承受 2.4V的压差损耗电压。 这部分电压会彻底的转换为热损耗， 并 将这部分热量散发到系统内， 损耗的热量为 AQ=I(LED额定电流) x2.4V。 根据统计学的 理论， 如果 LED灯串的数量足够的多， 那么 LED灯串在额定电流下的正向电压应该 符合正太分布。 绝大部分的 LED灯串的电压应该在 12V左右。 因此这时如果系统按照 14.4V输出电压的话， 那么系统的热损耗是相当大的。 以 1000 串、 4颗灯为一串、 电 流为 20mA的背光源为例， 热损耗的中心值为： 48W, 而灯的实际功耗为： 240W。 因 此， 这会大大降低系统的效率， 而且会使整个系统发热量巨大， 造成相当大的风险。
为解决上述的技术问题， 增加系统的可靠性。 目前大家往往釆用完全自适应电压 的方式来获得一个比较合适的电压。 即： 在一个 LED灯串背光系统内， 对当前的背光 系统的 LED灯串进行自适应电压补偿， 使整个 LED灯背光系统的所有 LED灯串都工 作在额定电流下。但是如果 LED灯串众多， 按照正太分布的统计原理， 在一个系统内， 某一串 LED灯串电压远远高于 12V的概率就大大增加。 这时， 这种自适应电压的方式 的可靠性就大大折扣。
另外， 如果不釆用自适应电压控制方式， 而釆用固定电压输出的方式的话， 输出 电压的选择会变得很难。 对于不同厂家生产的灯， 就很难满足兼容性。
因此， 需要一种背光驱动电压的控制技术， 能够解决上述技术问题。
发明内容
考虑到上述背景技术， 本发明的一个目的是提供一种背光驱动电压控制装置， 增 加了可靠性数据选择， 提高了系统的可靠性。
根据本发明的一个方面， 提供了一种背光驱动电压控制装置， 包括： 检测单元， 连接至控制器， 检测液晶屏背光源各分区的灯串的电流状态， 根据所述电流状态向所 述控制器发送反馈信号， 以及在接收到来自所述控制器的关闭反馈控制信号后， 不向 所述控制器发送与所述控制器挑选出的电压调节量大于阈值的灯串相对应的反馈信 号； 所述控制器， 连接至 AC到 DC转换器， 根据所述反馈信号向所述 AC到 DC转换 器发送电压调节控制信号， 以及根据所述电压调节控制信号获取每个灯串的电压调节 量， 挑选出电压调节量大于阈值的灯串， 并向所述检测单元发送所述关闭反馈控制信 号； 所述 AC到 DC转换器根据所述电压调节控制信号向所述灯串输出相应的电压， 使 所述灯串工作在额定电流下。
通过该背光驱动电压控制装置能够依次根据每个分区灯串的反馈信号调节输入给 灯串的电压， 如果 LED灯串电压过高， 则反馈信号减小， 从 AC-DC转换器输出的电 压则变小， 反之， 如果 LED灯串电压不足， 则反馈信号增大， 从 AC-DC转换器输出 的电压则变大， 以此来调节输入给灯串的电压， 对全部的灯串遍历检测， 从而可以获 取每个灯串的电压调节量， 进而挑选出电压调节量大于阈值的灯串， 这些挑选出的灯 串会造成系统的不稳定， 因此， 在液晶屏正常工作时， 可以关闭这些灯串的反馈信号， 打开剩余灯串的反馈信号， 使剩余的灯串能够进行电压的自适应调节， 使其工作在额 定电流下， 这样就能够实现可靠性数据的选择， 大大减少灯串的电压偏差给整个系统 所造成的可靠性风险。
在上述技术方案中， 优选地， 所述检测单元可以包括至少一个恒流控制芯片和釆 集电路， 其中， 所述至少一个恒流控制芯片， 控制所述灯串的电流状态， 所述釆集电 路连接在所述控制器与所述至少一个恒流控制芯片之间， 釆集所述灯串的电压数据并 传送至所述控制器， 所述控制器根据所述电压数据生成所述电压调节控制信号。
恒流控制芯片可以是一个， 也可以是多个， 分别对应多个 LED灯分区， 能够根据 灯串的电流状态给出一个反馈信号， 恒流控制芯片在这里是指一个综合了恒流源和电 流控制以及信号反馈的电路，为了实现电路的简单化，将这些电路封装在一个 IC内部， 在此称它为恒流控制芯片。 釆集电路则能够根据该反馈信号釆集相应的电压数据给控 制器。
在上述技术方案中， 优选地， 还可以包括： 存储器， 保存所述控制器挑选出的电 压调节量大于阈值的灯串的地址， 在下次开机时， 所述控制器从所述存储器中读取所 述电压调节量大于阈值的灯串的地址， 根据所述地址命令所述检测单元关闭所述电压 调节量大于阈值的灯串的反馈， 以及保存根据所述电压调节控制信号获取的每个灯串 的电压调节量， 根据保存的每个灯串的电压调节量来挑选出电压调节量大于阈值的灯 串。
存储器能够将控制器用到的数据进行保存， 例如遍历检测出的各灯串的电压调节 量， 以及挑选出的电压调节量大于阈值的灯串的地址。
在上述技术方案中， 优选地， 所述恒流控制芯片可以包括寄存器， 保存控制所述 灯串的反馈开关的数据， 根据所述控制器发送的所述地址， 将相应灯串的反馈开关设 置为关， 关闭所述相应灯串的反馈。
通过恒流控制芯片中的寄存器能够控制灯串的开关， 例如 1代表开， 0代表关， 如 果想关闭某个灯串的反馈， 则将寄存器的数据设置成 0即可。
在上述技术方案中， 优选地， 还可以包括： 受控电流源， 连接在所述釆集电路与 所述恒流控制芯片之间， 所述恒流控制芯片将所述灯串的电压作用于所述受控电流源， 当所述灯串的电压不足时， 所述受控电流源的电流增加， 所述釆集电路釆集的电压下 降； 当所述灯串的电压的过高时， 所述受控电流源的电流减小， 所述釆集电路釆集的 电压升高。
受控电流源是恒流控制芯片反馈信号的一种方式， 称为电流反馈型， 该恒流控制 芯片将 LED灯串的电压作用于该受控电源， 当 LED灯串的电压不足时， 该受控电流 源的电流增加， 此时控制器出检测的电压下降 （釆集电路检测的电压给控制器） ， 即 反馈给控制器的信号就是 LED灯串的电压不足， 反之， 当 LED灯串的电压过高时， 该受控电流源的电流减少， 此时控制器处检测的电压增高， 即反馈给控制器的信号就 是 LED灯串的电压过高。
在上述技术方案中， 优选地， 还可以包括二极管， 连接在所述釆集电路与所述恒 流控制芯片之间， 所述恒流控制芯片根据所述灯条的电压输出高低电平， 当所述灯条 的电压过高时， 所述二极管的阳极电压升高， 所述釆集电路釆集的电压升高； 当所述 灯条的电压不足时， 所述二极管的阳极电压降低， 所述釆集电路釆集的电压降低。
二极管是恒流控制芯片反馈信号的又一种方式， 称为电压反馈型。
在上述技术方案中， 优选地， 所述控制器还用于根据预置比例计算出选取具有电 压调节量大于阈值的灯串的数量， 使所述检测单元关闭与所述数量相对应的具有电压 调节量大于阈值的灯串的反馈。
根据预置比例来计算出针对一个系统， 挑选出多少个 led灯串是合适的， 根据计算 结果挑选出特定数量的且具有电压调节量大于阈值的灯串， 进一步提高了系统可靠性。
在上述技术方案中， 优选地， 所述控制器可以包括现场可编程门阵列 （FPGA )和 单片机。
本发明的另一目的是提供一种电视机， 其具有与背光驱动电压控制装置相同的技 术效果。
根据本发明的另一方面， 还提供了一种电视机， 包括如上述任一技术方案中所描 述的背光驱动电压控制装置。
通过该技术方案， 能够减少电视机的热损耗， 增加系统的可靠性， 且硬件结构简 单， 占用空闲小， 满足超薄化的趋势。
本发明的又一目的是提供一种背光驱动电压控制方法， 增加了可靠性数据选择， 提高了系统的可靠性。
根据本发明的又一方面， 还提供了一种背光驱动电压控制方法， 包括以下步骤： 检测液晶屏背光源各分区的灯串的电流状态， 根据所述电流状态的反馈信息控制输入 给所述灯串的电压； 获取每个灯串的电压调节量， 挑选出电压调节量大于阈值的灯串； 在下次运行过程中， 进行剩余灯串的电流状态的反馈， 根据所述剩余灯串的电流状态 调节输入至各分区的灯串的电压， 控制所述剩余灯串工作在额定电流下， 其中， 所述 剩余灯串为所述各分区的灯串减去所述电压调节量大于阈值的灯串。
首先依次根据每个分区灯串的反馈信号调节输入给灯串的电压， 如果 LED灯串电 压过高， 则反馈信号减小， 输出给灯串的电压则变小， 反之， 如果 LED灯串电压不足， 则反馈信号增大， 输出给灯串的电压则变大， 以此来调节输入给灯串的电压， 对全部 的灯串遍历检测， 从而可以获取每个灯串的电压调节量， 进而挑选出电压调节量大于 阈值的灯串， 这些挑选出的灯串会造成系统的不稳定， 因此， 在液晶屏正常工作时， 可以关闭这些灯串的反馈信号， 打开剩余灯串的反馈信号， 使剩余的灯串能够进行电 压的自适应调节， 使其工作在额定电流下， 这样就能够实现可靠性数据的选择， 大大 减少灯串的电压偏差给整个系统所造成的可靠性风险。
在上述技术方案中， 优选地， 所述检测液晶屏背光源各分区的灯串的电流状态， 根据所述电流状态的反馈信息控制输入给所述灯串的电压的步骤具体包括： 控制所述 灯串的电流状态， 根据所述电流状态生成反馈信息， 在生成所述反馈信息后， 釆集所 述灯串的电压数据， 根据所述电压数据调节输入给所述灯串的电压。
在上述技术方案中， 优选地， 所述获取每个灯串的电压调节量， 挑选出电压调节 量大于阈值的灯串的步骤还包括： 保存挑选出的电压调节量大于阈值的灯串的地址， 在下次运行过程中， 读取所述电压调节量大于阈值的灯串的地址， 根据所述地址命令 关闭所述电压调节量大于阈值的灯串的反馈； 保存获取的每个灯串的电压调节量， 根 据保存的每个灯串的电压调节量来挑选出电压调节量大于阈值的灯串。
在上述技术方案中， 优选地， 根据预置比例计算出选取具有电压调节量大于阈值 的灯串的数量， 关闭与所述数量相对应的具有电压调节量大于阈值的灯串的反馈。
根据预置比例来计算出针对一个系统， 挑选出多少个 led灯串是合适的， 根据计算 结果挑选出特定数量的且具有大于阈值的电压调节量的灯串， 进一步提高了系统的可 靠性。
根据本发明的技术方案， 首先在使灯串工作在额定电流的情况下， 遍历检测出每 个灯串的电压调节量， 根据这些数据挑选出电压调节量大于阈值的灯串， 同时将这些 灯串的地址进行保存。 在背光正常工作时， 读取这些灯串的地址， 将这些灯串的电流 反馈功能关闭， 而剩余的灯串的反馈功能均被打开， 根据反馈信号调制输出电压， 从 而使剩余灯串工作在额定电流下， 也避免了电压调节量大于阈值的灯串对系统造成的 热损耗， 保证了系统的可靠性， 同时也实现了自适应背光电压控制。
本发明还提供了一种存储在非易失性机器可读介质上的程序产品， 用于背光驱动 电压控制， 所述程序产品包括用于使计算机系统执行以下步骤的机器可执行指令： 检 测液晶屏背光源各分区的灯串的电流状态， 根据所述电流状态的反馈信息控制输入给 所述灯串的电压； 获取每个灯串的电压调节量， 挑选出电压调节量大于阈值的灯串； 在下次运行过程中， 进行剩余灯串的电流状态的反馈， 根据所述剩余灯串的电流状态 调节输入至各分区的灯串的电压， 控制所述剩余灯串工作在额定电流下， 其中， 所述 剩余灯串为所述各分区的灯串减去所述电压调节量大于阈值的灯串。
本发明还提供了一种非易失机器可读介质， 存储有用于背光驱动电压控制的程序 产品， 所述程序产品包括用于使计算机系统执行以下步骤的机器可执行指令： 检测液 晶屏背光源各分区的灯串的电流状态， 根据所述电流状态的反馈信息控制输入给所述 灯串的电压； 获取每个灯串的电压调节量， 挑选出电压调节量大于阈值的灯串； 在下 次运行过程中， 进行剩余灯串的电流状态的反馈， 根据所述剩余灯串的电流状态调节 输入至各分区的灯串的电压， 控制所述剩余灯串工作在额定电流下， 其中， 所述剩余 灯串为所述各分区的灯串减去所述电压调节量大于阈值的灯串。
本发明还提供了一种机器可读程序， 所述程序使机器执行如上所述技术方案中任 一所述的背光驱动电压控制方法。
本发明还提供了一种存储有机器可读程序的存储介质， 其中， 所述机器可读程序 使得机器执行如上所述技术方案中任一所述的背光驱动电压控制方法。 附图说明
图 1示出了根据本发明的一个实施例的背光驱动电压控制装置的框图； 图 2示出了根据本发明的又一实施例的背光驱动电压控制装置的框图； 图 3示出了根据本发明的再一实施例的背光驱动电压控制装置的框图； 图 4示出了根据本发明的一个实施例的背光驱动电压控制方法的流程图。 具体实施方式
为了能够更清楚地理解本发明的上述目的、 特征和优点， 下面结合附图和具体实 施方式对本发明进行进一步的详细描述。
在下面的描述中阐述了很多具体细节以便于充分理解本发明， 但是， 本发明还可 以釆用其他不同于在此描述的其他方式来实施， 因此， 本发明的保护范围并不受下面 公开的具体实施例的限制。
下面结合附图和实施例对本发明做进一步说明。 需要说明的是， 在不冲突的情况 下， 本申请的实施例及实施例中的特征可以相互组合。
首先结合图 1说明根据本发明的实施例的背光驱动电压控制装置。 图 1 示出了根 据本发明的一个实施例的背光驱动电压控制装置的框图。
如图 1所示， 根据本发明的实施例的背光驱动电压控制装置 100 包括： 检测单元 102, 连接至控制器 104, 检测液晶屏背光源各分区的灯串 A的电流状态， 根据所述电 流状态向所述控制器 104发送反馈信号， 以及在接收到来自所述控制器 104的关闭反 馈控制信号后， 不向所述控制器 104发送与所述控制器 104挑选出的电压调节量大于 阈值的灯串 A相对应的反馈信号； 所述控制器 104, 连接至 AC到 DC转换器 106, 根 据所述反馈信号向所述 AC到 DC转换器 106发送电压调节控制信号，以及根据所述电 压调节控制信号获取每个灯串 A的电压调节量，挑选出电压调节量大于阈值的灯串 A, 并向所述检测单元 102发送所述关闭反馈控制信号；所述 AC到 DC转换器 106根据所 述电压调节控制信号向所述灯串 A输出相应的电压，使所述灯串 A工作在额定电流下。
通过该背光驱动电压控制装置能够依次根据每个分区灯串的反馈信号调节输入给 灯串的电压， 如果 LED灯串电压过高， 则反馈信号减小， 从 AC-DC转换器输出的电 压则变小， 反之， 如果 LED灯串电压不足， 则反馈信号增大， 从 AC-DC转换器输出 的电压则变大， 以此来调节输入给灯串的电压， 对全部的灯串遍历检测， 从而可以获 取每个灯串的电压调节量， 进而挑选出电压调节量大于阈值的灯串， 这些挑选出的灯 串会造成系统的不稳定， 因此， 在液晶屏正常工作时， 可以关闭这些灯串的反馈信号， 打开剩余灯串的反馈信号， 使剩余的灯串能够进行电压的自适应调节， 使其工作在额 定电流下， 这样就能够实现可靠性数据的选择， 大大减少灯串的电压偏差给整个系统 所造成的可靠性风险。
在上述技术方案中， 优选地， 所述检测单元 102 可以包括至少一个恒流控制芯片 1022和釆集电路 1024, 其中， 所述至少一个恒流控制芯片 1022控制所述灯串 A的电 流状态，所述釆集电路 1024连接在所述控制器 104与所述至少一个恒流控制芯片 1022 之间， 釆集所述灯串 A的电压数据并传送至所述控制器 104, 所述控制器 104根据所 述电压数据生成所述电压调节控制信号。
恒流控制芯片 1022可以是一个， 也可以是多个， 分别对应多个 LED灯分区， 能 够根据灯串 A的电流状态给出一个反馈信号，恒流控制芯片 1022在这里是指一个综合 了恒流源和电流控制以及信号反馈的电路， 为了实现电路的简单化， 将这些电路封装 在一个 IC内部， 在此称它为恒流控制芯片。 釆集电路则能够根据该反馈信号釆集相应 的电压数据给控制器 104。
下面结合图 2至图 3详细说明根据本发明的又一实施例的背光驱动电压控制装置。 如图 2 所示， 示出了背光驱动电压控制装置的一种具体示例， 该背光驱动电压控 制装置包括控制器 104、 AC到 DC转换器 106以及釆集电路 1024和恒流控制芯片 1022, 该恒流控制芯片 1022将 LED灯条的电压作用一个受控电流源 204 , 当灯串 A的电压 不足时， 该受控电流源 204的电流增加， 此时控制器 104处所检测的电压下降， 则向 AC到 DC转换器 106发送电压调节控制信号， AC到 DC转换器 106在接收到该电压 调节控制信号时， 升高输入至 LED正极的电压。
同理， 当灯串的电压过高时， 该受控电流源 204的电流减少， 此时控制器 104处 所检测的电压升高， 则向 AC到 DC转换器 106发送电压调节控制信号， AC到 DC转 换器 106在接收到该电压调节控制信号时， 降低输入至 LED正极的电压。
本实施例中的背光驱动电压控制装置还可以包括： 存储器 108 , 保存控制器 104 挑选出的电压调节量大于阈值的灯串的地址， 在下次开机时， 控制器 104从该存储器 108 中读取所述电压调节量大于阈值的灯串的地址， 根据所述地址命令恒流控制芯片 1022关闭所述电压调节量大于阈值的灯串的反馈， 以及保存根据所述电压调节控制信 号获取的每个灯串的电压调节量， 根据保存的每个灯串的电压调节量来挑选出电压调 节量大于阈值的灯串。
因此， 存储器 108能够将控制器 104用到的数据进行保存， 例如遍历检测出的各 灯串的电压调节量， 以及挑选出的电压调节量大于阈值的灯串的地址。
关闭电压调节量大于阈值的灯串的反馈可以有多种方式， 其中优选地一种方式为 利用恒流控制芯片 1022 中的专用寄存器来保存各灯串的开关数据， 根据所述控制器 104发送的所述地址， 将相应灯串的反馈开关设置为关， 关闭所述相应灯串的反馈。 例 如 1代表开， 0代表关，如果想关闭某个灯串的反馈，则将寄存器的数据设置成 0即可。
本实施例中的背光驱动电压控制装置还可以包括： 受控电流源 204 , 连接在所述釆 集电路 1024与所述恒流控制芯片 1022之间， 所述恒流控制芯片 1022将所述灯串的电 压作用于所述受控电流源 204, 当所述灯串的电压不足时， 所述受控电流源 204的电流 增加， 所述釆集电路 1024釆集的电压下降； 当所述灯串的电压的过高时， 所述受控电 流源 204的电流减小， 所述釆集电路 1024釆集的电压升高。
受控电流源 204的应用是恒流控制芯片 1022反馈信号的一种方式， 称为电流反馈 型， 该恒流控制芯片将 LED灯串的电压作用于该受控电源， 当 LED灯串的电压不足 时， 该受控电流源的电流增加， 此时控制器 104检测的电压下降（釆集电路检测的电 压给控制器 104 ) , 所以反馈给控制器 104的信号就是 LED灯串的电压不足， 反之， 当 LED灯串的电压过高时， 该受控电流源的电流减少， 此时控制器 104处检测的电压 增高， 所以反馈给控制器 104的信号就是 LED灯串的电压过高。
接下来参考图 3 , 图 3示出了背光驱动电压控制装置的另一种具体示例，在该示例 中，该背光驱动电压控制装置同样具有控制器 104、 AC到 DC转换器 106和存储器 108 , 这些元器件的作用与上述实施例中相应元器件的作用相同， 不同之处在于， 恒流控制 芯片 1022的反馈方式为电压输出型， 恒流控制芯片 1022根据 LED灯条的电压输出一 个高低电平， 二极管 202连接在所述釆集电路 1024与所述恒流控制芯片 1022之间， 所述恒流控制芯片 1022根据所述灯条的电压输出高低电平， 当灯条的电压过高时， 所 述二极管 202的阳极电压升高， 所述釆集电路 1024釆集的电压升高； 而当所述灯条的 电压不足时， 所述二极管 202的阳极电压降低， 所述釆集电路 1024釆集的电压降低。
针对该种反馈方式， 电压釆集电路 1022可做如图 3所示的电路， 而针对恒流控制 芯片的电流反馈型方式，电压釆集电路 1022可做如图 2所示的电路。电压釆集电路 1022 只是一种状态的对应， 此处电压釆集电路 1022发送给控制器 104—个状态对应值。
在图 2和图 3所示的实施例中， 恒流控制芯片 1022的工作模式具体如下描述： 由于所有的灯条都共用一个阳极电压， 因此对于每一个恒流源来讲， 如果要保持 精准的电流控制， 则必须要使恒流源中的三极管或者 MOS管工作在放大状态， 而非饱 和状态， 因此需要将阳极电压提高到一定的程度。 如何确定阳极电压的大小呢， 这就 需要反馈信号来控制电压的升高。 若阳极电压不足时， 反馈信号反馈加大， 则电压升 高。 若阳极电压过高， 则反馈信号减小， 电压下降， 如此形成一个闭环。 而反馈信号 可以根据三极管的集电极电压反馈， 也可根据三极管的基极电流反馈。 对于 MOS管来 讲， 需根据栅极电压， 或者漏极电压反馈。 如果三极管电流不足， 则基极电流增加到 最大， 集电极电压降到最低， 这时反馈加大， 电压便升高。 同理对于 MOS管， 若 MOS 管电流不够， 则栅极电压最大， 漏极电压最低， 此时反馈加大， 电压升高， 以上过程 都在恒流控制芯片 1022内部完成。
在上述各实施例中， 所述控制器 104还用于根据预置比例计算出选取具有大于阈 值的电压调节量的灯串的数量， 使所述检测单元 102 关闭与所述数量相对应的具有大 于阈值的电压调节量的灯串的反馈。
根据预置比例来计算出针对一个系统挑选出多少个 led灯串是合适的，根据计算结 果挑选出特定数量的且具有大于阈值的电压调节量的灯串， 进一步提高了系统可靠性。 例如， 统计完全部灯串的电压调节量后， 根据可靠性的要求以及正态分布理论， 针对整个系统， 按照全部灯串数量的 a%, 选择出电压调节量最高的一部分灯串。 假定 全部的 LED灯串数量为 1000, 按照 5%的比例选择灯串， 则选择出电压调节量最高的 5个灯串， 即电压调节量大于阈值（输出电压越高， 调整量越大） 的 5个灯串， 将这 5 个灯串的电流反馈关闭， 并将这 5个灯串的地址存储到存储器中。
将相应灯串的反馈关闭后， 其他的全部灯串的反馈打开， 也就是说， 使输出电压 满足剩余全部灯串恒流源放大状态的条件。 控制器根据电压釆集电路的电压值使剩余 的 LED灯串工作在额定电流下， 即实现了自适应背光电压控制。
在此， 本领域内的技术人员应该理解， 上述各实施例中的控制器 104 可以包括现 场可编程门阵列 （FPGA ) 和单片机。
在具体实现时， FPGA可通过一个 PWM信号进行 RC滤波后得到一个高低电平信 号， 来影响 AC-DC的反馈环路， 从而实现对输出电压的控制。
根据本发明的背光驱动电压控制装置首先在使灯串工作在额定电流的情况下， 遍 历检测出每个灯串的电压调节量， 根据这些数据挑选出电压调节量大于阈值的灯串， 同时将这些灯串的地址进行保存。 在背光正常工作时， 读取这些灯串的地址， 将这些 灯串的电流反馈功能关闭， 而剩余的灯串的反馈功能均被打开， 根据反馈信号调制输 出电压， 从而使剩余灯串工作在额定电流下， 也避免了电压调节量大于阈值的灯串对 系统造成的热损耗， 保证了系统的可靠性， 同时也实现了自适应背光电压控制。
根据本发明的另一方面， 还提供了一种电视机， 包括如上述任一技术方案中所描 述的背光驱动电压控制装置。
通过该技术方案， 能够减少电视机的热损耗， 增加系统的可靠性， 且硬件结构简 单， 占用空闲小， 满足超薄化的趋势。
图 4示出了根据本发明的一个实施例的背光驱动电压控制方法的示意图。
如图 4 所示， 根据本发明的实施例的背光驱动电压控制方法， 包括以下步骤： 步 骤 402 ,检测液晶屏背光源各分区的灯串的电流状态，根据电流状态的反馈信息控制输 入给灯串的电压； 步骤 404, 获取每个灯串的电压调节量， 挑选出电压调节量大于阈值 的灯串； 步骤 406 , 在下次运行过程中， 进行剩余灯串的电流状态的反馈， 根据剩余灯 串的电流状态调节输入至各分区的灯串的电压， 控制剩余灯串工作在额定电流下， 其 中， 剩余灯串为各分区的灯串减去电压调节量大于阈值的灯串。
首先依次根据每个分区灯串的反馈信号调节输入给灯串的电压， 如果 LED灯串电 压过高， 则反馈信号减小， 输出给灯串的电压则变小， 反之， 如果 LED灯串电压不足， 则反馈信号增大， 输出给灯串的电压则变大， 以此来调节输入给灯串的电压， 对全部 的灯串遍历检测， 从而可以获取每个灯串的电压调节量， 进而挑选出电压调节量大于 阈值的灯串， 这些挑选出的灯串会造成系统的不稳定， 因此， 在液晶屏正常工作时， 可以关闭这些灯串的反馈信号， 打开剩余灯串的反馈信号， 使剩余的灯串能够进行电 压的自适应调节， 使其工作在额定电流下， 这样就能够实现可靠性数据的选择， 大大 减少灯串的电压偏差给整个系统所造成的可靠性风险。
在上述技术方案中， 优选地， 该步骤 402具体包括： 控制灯串的电流状态， 根据 电流状态生成反馈信息， 在生成反馈信息后， 釆集灯串的电压数据， 根据电压数据调 节输入给灯串的电压。
在上述技术方案中， 优选地， 该步骤 404还可以包括： 保存挑选出的电压调节量 大于阈值的灯串的地址， 在下次运行过程中， 读取电压调节量大于阈值的灯串的地址， 根据地址命令关闭电压调节量大于阈值的灯串的反馈； 保存获取的每个灯串的电压调 节量， 根据保存的每个灯串的电压调节量来挑选出电压调节量大于阈值的灯串。
在上述技术方案中， 优选地， 根据预置比例计算出选取具有大于阈值的电压调节 量的灯串的数量， 关闭与数量相对应的具有大于阈值的电压调节量的灯串的反馈。
根据预置比例来计算出针对一个系统， 挑选出多少个 led灯串是合适的， 根据计算 结果挑选出特定数量的且具有大于阈值的电压调节量的灯串， 进一步提高了系统的可 靠性。
以上结合附图详细说明了根据本发明的技术方案， 首先在使灯串工作在额定电流 的情况下， 遍历检测出每个灯串的电压调节量， 根据这些数据挑选出电压调节量大于 阈值的灯串， 同时将这些灯串的地址进行保存。 在背光正常工作时， 读取这些灯串的 地址， 将这些灯串的电流反馈功能关闭， 而剩余的灯串的反馈功能均被打开， 根据反 馈信号调制输出电压， 从而使剩余灯串工作在额定电流下， 也避免了电压调节量大于 阈值的灯串对系统造成的热损耗， 保证了系统的可靠性， 同时也实现了自适应背光电 压控制。
本发明还提供了一种存储在非易失性机器可读介质上的程序产品， 用于背光驱动 电压控制， 所述程序产品包括用于使计算机系统执行以下步骤的机器可执行指令： 检 测液晶屏背光源各分区的灯串的电流状态， 根据所述电流状态的反馈信息控制输入给 所述灯串的电压； 获取每个灯串的电压调节量， 挑选出电压调节量大于阈值的灯串； 在下次运行过程中， 进行剩余灯串的电流状态的反馈， 根据所述剩余灯串的电流状态 调节输入至各分区的灯串的电压， 控制所述剩余灯串工作在额定电流下， 其中， 所述 剩余灯串为所述各分区的灯串减去所述电压调节量大于阈值的灯串。
本发明还提供了一种非易失机器可读介质， 存储有用于背光驱动电压控制的程序 产品， 所述程序产品包括用于使计算机系统执行以下步骤的机器可执行指令： 检测液 晶屏背光源各分区的灯串的电流状态， 根据所述电流状态的反馈信息控制输入给所述 灯串的电压； 获取每个灯串的电压调节量， 挑选出电压调节量大于阈值的灯串； 在下 次运行过程中， 进行剩余灯串的电流状态的反馈， 根据所述剩余灯串的电流状态调节 输入至各分区的灯串的电压， 控制所述剩余灯串工作在额定电流下， 其中， 所述剩余 灯串为所述各分区的灯串减去所述电压调节量大于阈值的灯串。
本发明还提供了一种机器可读程序， 所述程序使机器执行如上所述技术方案中任 一所述的背光驱动电压控制方法。
本发明还提供了一种存储有机器可读程序的存储介质， 其中， 所述机器可读程序 使得机器执行如上所述技术方案中任一所述的背光驱动电压控制方法
在本发明中， 除非另有明确的规定和限定， 术语"安装"、 "相连"、 "连接"、 "固定" 等术语应做广义理解， 例如， 可以是固定连接， 也可以是可拆卸连接， 或一体地连接； 可以是机械连接， 也可以是电连接； 可以是直接相连， 也可以通过中间媒介间接相连， 可以是两个元件内部的连通。 对于本领域的普通技术人员而言， 可以根据具体情况理 解上述术语在本发明中的具体含义。
以上所述仅为本发明的优选实施例而已， 并不用于限制本发明， 对于本领域的技 术人员来说， 本发明可以有各种更改和变化。 凡在本发明的精神和原则之内， 所作的 任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之内。

Claims

权 利 要 求 书
1. 一种背光驱动电压控制装置， 包括：
检测单元， 连接至控制器， 检测液晶屏背光源各分区的灯串的电流状态， 根据所述电流状态向所述控制器发送反馈信号，以及在接收到来自所述控制器 的关闭反馈控制信号后，不向所述控制器发送与所述控制器挑选出的电压调节 量大于阈值的灯串相对应的反馈信号；
所述控制器， 连接至 AC到 DC转换器， 根据所述反馈信号向所述 AC到 DC转换器发送电压调节控制信号， 以及根据所述电压调节控制信号获取每个 灯串的电压调节量，挑选出电压调节量大于阈值的灯串， 并向所述检测单元发 送所述关闭反馈控制信号；
所述 AC到 DC转换器， 根据所述电压调节控制信号向所述灯串输出相应 的电压， 使所述灯串工作在额定电流下。
2. 根据权利要求 1 所述的背光驱动电压控制装置， 还包括： 存储器， 保 存所述控制器挑选出的电压调节量大于阈值的灯串的地址，在下次开机时， 所 述控制器从所述存储器中读取所述电压调节量大于阈值的灯串的地址，并根据 所述地址命令所述检测单元关闭所述电压调节量大于阈值的灯串的反馈，以及 保存根据所述电压调节控制信号获取的每个灯串的电压调节量，根据保存的每 个灯串的电压调节量来挑选出电压调节量大于阈值的灯串。
3. 根据权利要求 2所述的背光驱动电压控制装置， 其中， 所述检测单元 包括至少一个恒流控制芯片和采集电路， 其中， 所述至少一个恒流控制芯片， 控制所述灯串的电流状态，所述采集电路连接在所述控制器与所述至少一个恒 流控制芯片之间， 采集所述灯串的电压数据并传送至所述控制器， 所述控制器 根据所述电压数据生成所述电压调节控制信号。
4. 根据权利要求 3所述的背光驱动电压控制装置， 其中， 所述恒流控制 芯片包括寄存器，保存控制所述灯串的反馈开关的数据，根据所述控制器发送 的所述地址， 将相应灯串的反馈开关设置为关， 关闭所述相应灯串的反馈。
5. 根据权利要求 3所述的背光驱动电压控制装置， 还包括： 受控电流源， 连接在所述采集电路与所述恒流控制芯片之间，所述恒流控制芯片将所述灯串 的电压作用于所述受控电流源， 当所述灯串的电压不足时， 所述受控电流源的 电流增加， 所述采集电路采集的电压下降； 当所述灯串的电压的过高时， 所述 受控电流源的电流减小， 所述采集电路采集的电压升高。
6. 根据权利要求 3所述的背光驱动电压控制装置， 还包括二极管， 连接 在所述采集电路与所述恒流控制芯片之间，所述恒流控制芯片根据所述灯条的 电压输出高低电平， 当所述灯条的电压过高时， 所述二极管的阳极电压升高， 所述采集电路采集的电压升高； 当所述灯条的电压不足时， 所述二极管的阳极 电压降低， 所述采集电路采集的电压降低。
7. 根据权利要求 1 所述的背光驱动电压控制装置， 其中， 所述控制器还 用于根据预置比例计算出选取具有电压调节量大于阈值的灯串的数量，使所述 检测单元关闭与所述数量相对应的具有电压调节量大于阈值的灯串的反馈。
8. 根据权利要求 1至 7中任一项所述的背光驱动电压控制装置， 其中， 所述控制器包括现场可编程门阵列和单片机。
9. 一种电视机， 包括如权利要求 1至 8中任一项所述的背光驱动电压控 制装置。
10. 一种背光驱动电压控制方法， 包括：
检测液晶屏背光源各分区的灯串的电流状态， 根据所述电流状态的反馈信 息控制输入给所述灯串的电压；
获取每个灯串的电压调节量， 挑选出电压调节量大于阈值的灯串； 在下次运行过程中， 进行剩余灯串的电流状态的反馈， 根据所述剩余灯串 的电流状态调节输入至各分区的灯串的电压，控制所述剩余灯串工作在额定电 流下， 其中， 所述剩余灯串为所述各分区的灯串减去所述电压调节量大于阈值 的灯串。
11. 根据权利要求 10所述的背光驱动电压控制方法， 其中， 所述检测液 晶屏背光源各分区的灯串的电流状态，根据所述电流状态的反馈信息控制输入 给所述灯串的电压的步骤具体包括： 控制所述灯串的电流状态，根据所述电流 状态生成反馈信息， 在生成所述反馈信息后， 采集所述灯串的电压数据， 根据 所述电压数据调节输入给所述灯串的电压。
12. 根据权利要求 10所述的背光驱动电压控制方法， 其中， 所述获取每 个灯串的电压调节量，挑选出电压调节量大于阈值的灯串的步骤还包括： 保存 挑选出的电压调节量大于阈值的灯串的地址，在下次运行过程中，读取所述电 压调节量大于阈值的灯串的地址， ^据所述地址命令关闭所述电压调节量大于 阈值的灯串的反馈；
保存获取的每个灯串的电压调节量， 根据保存的每个灯串的电压调节量来 挑选出电压调节量大于阈值的灯串。
13. 根据权利要求 10至 12中任一项所述的背光驱动电压控制方法， 其 中，根据预置比例计算出选取具有电压调节量大于阈值的灯串的数量， 关闭与 所述数量相对应的具有电压调节量大于阈值的灯串的反馈。
14. 一种机器可读程序， 所述程序使机器执行如权利要求 10至 13中的 任一项权利要求所述的背光驱动电压控制方法。
15. 一种存储有机器可读程序的存储介质， 其中， 所述机器可读程序使得 机器执行如权利要求 10至 13中的任一项权利要求所述的背光驱动电压控制方 法。
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104253955A (zh) * 2014-09-17 2014-12-31 广州视源电子科技股份有限公司 一种低功耗的恒流与稳压控制电路及电视机

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* Cited by examiner, † Cited by third party
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CN114267302B (zh) * 2021-12-31 2022-11-08 北京显芯科技有限公司 控制方法、调光控制器以及显示设备

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080150877A1 (en) * 2006-12-25 2008-06-26 Chunghwa Picture Tubes, Ltd. Current-controlling apparatus
CN101315751A (zh) * 2007-05-30 2008-12-03 奇景光电股份有限公司 液晶屏幕电源模块
CN101409048A (zh) * 2007-10-10 2009-04-15 群康科技(深圳)有限公司 背光保护电路
US20090122003A1 (en) * 2007-11-08 2009-05-14 Chunghwa Picture Tubes, Ltd. Driving device for backlight module and display device thereof
CN101605416A (zh) * 2008-06-13 2009-12-16 登丰微电子股份有限公司 发光二极管驱动电路及其控制器
CN101916548A (zh) * 2010-07-22 2010-12-15 福建捷联电子有限公司 一种液晶显示器发光二极管灯管控制电路
CN102376273A (zh) * 2011-09-30 2012-03-14 青岛海信电器股份有限公司 Led背光源驱动装置

Family Cites Families (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4672518A (en) * 1986-07-30 1987-06-09 American Telephone And Telegraph Co., At&T Bell Labs Current mode control arrangement with load dependent ramp signal added to sensed current waveform
JP3957150B2 (ja) * 2001-02-08 2007-08-15 セイコーインスツル株式会社 Ｌｅｄ駆動回路
GB2369730B (en) * 2001-08-30 2002-11-13 Integrated Syst Tech Ltd Illumination control system
US6683419B2 (en) * 2002-06-24 2004-01-27 Dialight Corporation Electrical control for an LED light source, including dimming control
JP4016915B2 (ja) 2003-09-11 2007-12-05 株式会社日立製作所 表示システム及びそれに用いられる表示パネル、信号処理装置
US20060214876A1 (en) * 2005-03-23 2006-09-28 Sony Ericsson Mobile Communications Ab Electronic device having a light bus for controlling light emitting elements
KR20070016873A (ko) 2005-08-05 2007-02-08 삼성전자주식회사 백라이트 유닛, 이를 포함하는 디스플레이장치 및 그제어방법
US7638754B2 (en) 2005-10-07 2009-12-29 Sharp Kabushiki Kaisha Backlight device, display apparatus including backlight device, method for driving backlight device, and method for adjusting backlight device
US7926300B2 (en) * 2005-11-18 2011-04-19 Cree, Inc. Adaptive adjustment of light output of solid state lighting panels
US7923943B2 (en) * 2006-01-10 2011-04-12 Microsemi Corp.—Analog Mixed Signal Group Ltd. Secondary side post regulation for LED backlighting
KR100917623B1 (ko) * 2006-02-13 2009-09-17 삼성전자주식회사 Ｌｅｄ 구동장치
US20070273681A1 (en) * 2006-05-24 2007-11-29 Mayell Robert J Method and apparatus to power light emitting diode arrays
JP5046791B2 (ja) * 2007-05-17 2012-10-10 セイコーＮｐｃ株式会社 Ｌｅｄ駆動回路
US7880400B2 (en) * 2007-09-21 2011-02-01 Exclara, Inc. Digital driver apparatus, method and system for solid state lighting
CN101431845B (zh) * 2007-11-05 2012-05-23 深圳桑达百利电器有限公司 Led灯串的驱动方法及电路
JP5525451B2 (ja) * 2007-11-16 2014-06-18 アレグロ・マイクロシステムズ・エルエルシー 複数の直列接続された発光ダイオード列を駆動するための電子回路
US8115414B2 (en) * 2008-03-12 2012-02-14 Freescale Semiconductor, Inc. LED driver with segmented dynamic headroom control
KR101286540B1 (ko) 2008-04-16 2013-07-17 엘지디스플레이 주식회사 액정표시장치
US8279144B2 (en) * 2008-07-31 2012-10-02 Freescale Semiconductor, Inc. LED driver with frame-based dynamic power management
US8049439B2 (en) * 2009-01-30 2011-11-01 Freescale Semiconductor, Inc. LED driver with dynamic headroom control
US8081199B2 (en) * 2009-06-26 2011-12-20 Panasonic Corporation Light emitting element drive apparatus, planar illumination apparatus, and liquid crystal display apparatus
KR101708371B1 (ko) * 2009-07-16 2017-03-09 삼성디스플레이 주식회사 백라이트 유닛 및 이를 갖는 표시장치
JP2011059658A (ja) 2009-08-11 2011-03-24 Sony Corp 表示装置、表示方法およびコンピュータプログラム
WO2011056430A1 (en) 2009-10-28 2011-05-12 Dolby Laboratories Licensing Corporation Stereoscopic dual modulator display device using full color anaglyph
CN101827221B (zh) * 2010-03-23 2011-12-28 华南理工大学 Ccd光源强度自适应调节系统及其方法
CN101917794B (zh) * 2010-06-28 2013-09-25 浙江大华技术股份有限公司 红外摄像机的红外灯功率自适应量化调整方法
KR20120003270A (ko) * 2010-07-02 2012-01-10 엘지이노텍 주식회사 Ｌｅｄ 구동 장치
US9350982B2 (en) 2010-07-22 2016-05-24 Seiko Epson Corporation Image display device, image supply device, and image processing method with brightness expanding processing for improved contrast sensitivity in a 3D image
CN101917809B (zh) * 2010-08-24 2013-11-13 成都芯源系统有限公司 驱动多个发光元件的驱动器、驱动方法以及显示设备
CN201904072U (zh) * 2010-12-01 2011-07-20 福建捷联电子有限公司 利用显示器Scaler芯片驱动控制LED背光源电路

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080150877A1 (en) * 2006-12-25 2008-06-26 Chunghwa Picture Tubes, Ltd. Current-controlling apparatus
CN101315751A (zh) * 2007-05-30 2008-12-03 奇景光电股份有限公司 液晶屏幕电源模块
CN101409048A (zh) * 2007-10-10 2009-04-15 群康科技(深圳)有限公司 背光保护电路
US20090122003A1 (en) * 2007-11-08 2009-05-14 Chunghwa Picture Tubes, Ltd. Driving device for backlight module and display device thereof
CN101605416A (zh) * 2008-06-13 2009-12-16 登丰微电子股份有限公司 发光二极管驱动电路及其控制器
CN101916548A (zh) * 2010-07-22 2010-12-15 福建捷联电子有限公司 一种液晶显示器发光二极管灯管控制电路
CN102376273A (zh) * 2011-09-30 2012-03-14 青岛海信电器股份有限公司 Led背光源驱动装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104253955A (zh) * 2014-09-17 2014-12-31 广州视源电子科技股份有限公司 一种低功耗的恒流与稳压控制电路及电视机
CN104253955B (zh) * 2014-09-17 2017-09-12 广州视源电子科技股份有限公司 一种低功耗的恒流与稳压控制电路及电视机

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