WO2020098073A1 - 背光调节电路、背光模组及显示装置 - Google Patents

背光调节电路、背光模组及显示装置 Download PDF

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Publication number
WO2020098073A1
WO2020098073A1 PCT/CN2018/122541 CN2018122541W WO2020098073A1 WO 2020098073 A1 WO2020098073 A1 WO 2020098073A1 CN 2018122541 W CN2018122541 W CN 2018122541W WO 2020098073 A1 WO2020098073 A1 WO 2020098073A1
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Prior art keywords
circuit
light
emitting
branch
main control
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Application number
PCT/CN2018/122541
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English (en)
French (fr)
Inventor
李汶欣
黄笑宇
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惠科股份有限公司
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Priority to US17/272,656 priority Critical patent/US11450285B2/en
Publication of WO2020098073A1 publication Critical patent/WO2020098073A1/zh

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    • 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
    • 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
    • G09G3/3413—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
    • G09G3/20—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
    • G09G3/36—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 using liquid crystals
    • 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]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • 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

Definitions

  • the application relates to a backlight adjustment circuit, a backlight module and a display device.
  • the liquid crystal display device is currently the mainstream product of flat panel display. Since the liquid crystal itself does not emit light, it needs to be matched with a backlight source for display. The uniformity of the backlight is one of the important factors that affect the effect of the liquid crystal display. The applicant realized that it is difficult to adjust the brightness of the backlight after the traditional backlight architecture is completed, and it is easy for unevenness of the backlight to produce display effects. negative impacts.
  • a backlight adjustment circuit and a display device are provided.
  • a backlight adjustment circuit includes: a reference electrical information circuit, a feedback selection circuit, a main control circuit, and at least two light-emitting branches connected in parallel with each other;
  • the reference electrical information circuit is connected to the main control circuit to provide reference electrical parameter information to the main control circuit;
  • the feedback selection circuit is respectively connected to the main control circuit and the light-emitting branch to provide the main control circuit with the power of each light-emitting branch Information;
  • the main control circuit is connected to the light-emitting branch, and is used to adjust the current size of each light-emitting branch according to the reference electrical parameter information and the electrical information of the light-emitting branch.
  • the feedback selection circuit includes a matrix circuit configured to gate the light-emitting branch, and the matrix circuit includes a plurality of first transistors arranged in a matrix.
  • the number of rows of the matrix circuit corresponds to the number of light-emitting branches.
  • the first transistor of each row is connected in series as a row branch.
  • the input end of the row branch is connected to the corresponding light-emitting branch, and the output end is The feedback receiving end of the main control circuit is connected.
  • the number of columns of the matrix circuit corresponds to the logarithm of the number of light-emitting branches based on 2, and the control terminal of the first transistor in each column is connected to the corresponding feedback control terminal on the main control circuit.
  • the light-emitting branch includes a current regulator and a light-emitting device
  • the main control circuit includes an electrical information comparator and a controller
  • the electrical information comparator is configured to compare the reference electrical parameter information with the electrical information of the light-emitting device, The comparison result is obtained
  • the controller is set to control the current regulator according to the comparison result, and adjust the brightness of the light emitting device.
  • the light emitting device includes one or more light emitting diodes connected in series.
  • the light emitting device includes one or more cold cathode fluorescent tubes connected in series.
  • the electrical information comparator includes a voltage comparator; the reference electrical information circuit includes a reference voltage circuit, and the reference electrical parameter information includes reference voltage information.
  • the electrical information comparator includes a current comparator
  • the reference electrical information circuit includes a reference current circuit
  • the reference electrical parameter information includes reference current information
  • the current regulator includes a second transistor with a light emitting diode, the second transistor being controlled by the controller.
  • the second transistor includes a field effect transistor.
  • it further includes a memory configured to store reference voltage information provided to the reference voltage circuit.
  • the voltage value provided by the reference voltage information is the same as the feedback voltage value during normal operation of the light-emitting branch.
  • the light emitting diode is connected in series with the resistor.
  • the feedback selection circuit is connected to the remote end of the resistor and is configured to collect voltage information on the resistor.
  • the present application also provides a backlight module, including a backlight adjustment circuit and a number of optical diaphragms, wherein the backlight adjustment circuit includes a reference electrical information circuit, a feedback selection circuit, a main control circuit, and at least two light-emitting branches parallel to each other; reference The electrical information circuit is connected to the main control circuit, and is set to provide reference electrical parameter information to the main control circuit; the feedback selection circuit is respectively connected to the main control circuit and the light-emitting branch, and is set to provide the main control circuit with electrical information of each light-emitting branch The main control circuit is connected to the light-emitting branch, and is set to adjust the current size of each light-emitting branch according to the reference electrical parameter information and the electrical information of the light-emitting branch.
  • the feedback selection circuit of the backlight adjustment circuit includes a matrix circuit configured to gate the light-emitting branch, and the matrix circuit includes a plurality of first transistors arranged in a matrix.
  • the matrix circuit of the backlight adjustment circuit is provided with a number of rows corresponding to the number of light-emitting branches, the first transistor in each row is connected in series as a row branch, and the input end of the row branch is corresponding to the corresponding light-emitting branch Connect, the output end is connected with the feedback receiving end of the main control circuit.
  • the number of columns of the matrix circuit of the backlight adjustment circuit corresponds to the logarithm of the number of light-emitting branches based on 2, and the control terminal of the first transistor in each column corresponds to the corresponding feedback control terminal on the main control circuit connection.
  • a display device includes a liquid crystal panel and the above backlight module.
  • This application provides a backlight adjustment circuit.
  • a feedback selection circuit By setting a feedback selection circuit, the electrical information of each light-emitting branch can be fed back to the main control circuit.
  • the main control circuit compares the feedback electrical information with the reference electrical parameter information to do The control judgment is made to realize the control of the current value of each light-emitting branch, and then the brightness of each light-emitting branch, so as to obtain a uniformly-emitting backlight.
  • the use of the feedback selection circuit can save the number of interfaces connected to the main control circuit.
  • FIG. 1 is a structural block diagram of backlight adjustment according to one or more embodiments.
  • FIG. 2 is a circuit structure diagram of a backlight adjustment circuit according to one or more embodiments.
  • FIG. 3 is a circuit structure diagram of a backlight adjustment circuit according to one or more embodiments.
  • FIG. 4 is a circuit structure diagram of a backlight adjustment circuit in another embodiment.
  • the backlight adjustment circuit provided by this application can be applied to the field of display technology.
  • the public has increasingly higher requirements for the image quality of liquid crystal displays, and the liquid crystal panels themselves do not emit light, and require backlight support to display.
  • the quality of the backlight has an important influence on the display quality of the liquid crystal display, and the uniformity of the backlight is one of the important factors to measure the quality of the backlight.
  • adjusting the backlight uniformity requires connecting each light-emitting branch of the backlight to the main control circuit to feed back related information, which will occupy a lot of feedback interfaces of the main control circuit.
  • a backlight adjustment circuit including: a reference electrical information circuit 1, a feedback selection circuit 2, a main control circuit 3, and at least two light-emitting branches 4 connected in parallel to each other;
  • the electrical information circuit 1 is connected to the main control circuit 3 to provide reference electrical parameter information to the main control circuit 3;
  • the feedback selection circuit 2 is respectively connected to the main control circuit 3 and the light-emitting branch 4 to provide the main control circuit 3 with The electrical information of one light-emitting branch 4;
  • the main control circuit 3 is connected to the light-emitting branch 4, and is used to adjust the current size of each light-emitting branch 4 according to the reference electrical parameter information and the electrical information of the light-emitting branch 4.
  • the light-emitting branch 4 emits light during operation to provide a light source.
  • the light-emitting branch 4 may include any light-emitting device, such as a light-emitting diode, an organic light-emitting diode, or a cold cathode fluorescent tube.
  • the reference electrical information circuit 1 provides the main control circuit 3 with reference electrical parameter information for maintaining the operation of the light-emitting branch 4.
  • the reference electrical parameter information may be voltage information, current information, or even power information.
  • the feedback selection circuit 2 can gate a light-emitting branch 4 under the control of the main control circuit 3, so as to collect electrical information of the light-emitting branch 4 and feed the electrical information back to the main control circuit 3.
  • the electrical information of the light-emitting branch 4 fed back by the feedback selection circuit 2 may be voltage information, current information, or even power information, which may correspond to the reference electrical parameter information, so that the main control circuit 3 can convert the light-emitting branch
  • the electrical information of circuit 4 is compared with the reference electrical parameter information, that is, if the reference electrical parameter information is voltage information, the feedback selection circuit 2 is also set to feedback the voltage information of the light-emitting branch 4; in the same way, if the reference electrical parameter information is current Information, the electrical information of the light-emitting branch 4 fed back by the feedback selection circuit 2 is also current information.
  • the main control circuit 3 compares the reference electrical parameter information with the electrical information of the light-emitting branch 4 to determine whether the light-emitting branch 4 needs to be adjusted, thereby controlling the light-emitting brightness of the light-emitting branch.
  • a feedback selection circuit 2 is provided, which can feed back the electrical information of each light-emitting branch 4 to the main control circuit 3.
  • the main control circuit 3 makes a control judgment by comparing the fed back electrical information with reference electrical parameter information To realize the control of the current value of each light-emitting branch 4, and then the brightness control of each light-emitting branch 4, so as to obtain a uniformly illuminating backlight. Due to the limited interface of the main control circuit 3, it is often necessary to reserve an interface for other circuits to connect.
  • this embodiment uses the feedback selection circuit 2, only the main control circuit 3 and the feedback The selection circuit 2 is connected without having to be connected to each light-emitting branch 4, which can save the number of interfaces connected to the main control circuit 3.
  • one light-emitting branch 4 is a light string on the light bar, including several light-emitting devices connected in series, a switching device and a resistor R are connected in series , Light-emitting devices can be selected to use light-emitting diodes.
  • the light-emitting branches CH1 to CH4 are connected to the feedback selection circuit 2 through the feedback branches A1, A2, A3, and A4, respectively.
  • each feedback branch needs to occupy an interface of the main control circuit 3.
  • the conversion of the feedback selection circuit 2 only needs to occupy the main circuit
  • the three interfaces of the control circuit 3 can reduce the number of interfaces connected to the main control circuit 3.
  • the feedback selection circuit 2 feeds back the electrical information of each light-emitting branch 4 to the main control circuit 3 for electrical information comparison. If the electrical information is different from the reference electrical information, the main control circuit 3 will issue a signal to control the switching devices M1 to M4, thereby Control the current of each branch, so that the current of each light-emitting branch tends to be consistent, achieve real-time control of the brightness consistency of each light-emitting branch, and maintain uniform backlighting.
  • the feedback selection circuit 2 includes a matrix circuit for gating the light-emitting branch, and the matrix circuit includes several first transistors. Among them, the first transistors are arranged in an array to form a matrix circuit.
  • the number of rows of the matrix circuit is the number of branches of the light-emitting branch 4.
  • the number of columns of the matrix circuit is that the number of branches of the light-emitting branch 4 is a true number, and the logarithm of the base 2 is a rounded integer. Taking 4 light-emitting branches as an example, the number of rows of the matrix circuit is 4, and the number of columns is the logarithm of the number of branches with 2 as the base. The result is 2, so the matrix circuit has 2 columns.
  • the number of rows of the matrix circuit is 8, and the number of columns is 3.
  • the number of rows of the matrix circuit is 6, and the number of columns is a rounded integer of the logarithm of 6 based on 2, that is, because the logarithm is 2.6, the rounded number is rounded to 3, so the number of columns in the matrix circuit is 3.
  • the number of first transistors in the matrix circuit is the product of the number of rows and columns of the matrix circuit, and the first transistors are arranged according to the above-mentioned number of rows and columns.
  • the first transistor of each row is connected in series as a row branch.
  • the input end of the row branch is connected to the corresponding light-emitting branch 4, and the output end is connected to the common output terminal and then connected to the feedback receiving end of the main control circuit 3;
  • the control terminal of the transistor is connected to the common control terminal and connected to the corresponding feedback control terminal on the main control circuit 3.
  • the first transistor may be a field effect tube, and the field effect tube may be a metal oxide semiconductor field effect tube (MOSFET, Metal-Oxide-Semiconductor Field-Effect Transistor), because the source and drain of the metal oxide semiconductor field effect tube It has symmetry, even if the two ends are swapped, it will not affect the performance of the device, and its on-resistance is also very small. If it is used in a voltage feedback circuit, the voltage drop due to the on-resistance has little effect on the feedback signal and can accurately The main control circuit 3 feeds back voltage information.
  • MOSFET Metal-Oxide-Semiconductor Field-Effect Transistor
  • the arrangement of the first transistors in the feedback selection circuit 2 is introduced.
  • the field effect tubes are arranged in this embodiment, where the N-type field effect tube is denoted by N and the P-type field effect tube is denoted by P:
  • the feedback selection circuit 2 is a matrix of 4 rows ⁇ 2 columns, the first row to the first
  • the four rows of field effect tubes are arranged in the order of PP, PN, NP, and NN. If P corresponds to binary number 0 and N corresponds to binary number 1, then the arrangement of field effect tubes corresponds to the binary number 00, 01, 10, 11 order.
  • Each row of field effect transistors is connected in series to form a row branch, which is the first row branch to the fourth row branch, and the input ends of the first to fourth row branches are sequentially connected to the light-emitting branch CH1 to the light-emitting branch CH4.
  • the output terminal is connected to the feedback receiving terminal S of the main control circuit 3 in common
  • the control terminal of the first column of field effect transistors is connected to the first common control terminal and is connected to the corresponding feedback control terminal C on the main control circuit 3
  • the control terminal of the field effect tube is connected to the second common control terminal and connected to the corresponding feedback control terminal D on the main control circuit 3.
  • the feedback control end of the main control circuit 3 sends out corresponding control signals, which can control the feedback selection circuit 2 to feed back the corresponding light-emitting branch 4 with electrical information, and then obtain a comparison result by comparing with the reference electrical parameter information. For each light-emitting branch 4 Make brightness adjustments.
  • the light-emitting branch 4 includes a current regulator 41 and a light-emitting device 42
  • the main control circuit 3 includes an electrical information comparator 31 and a controller 32; the electrical information comparator 31 is used to reference electrical parameter information and light emission The electrical information of the device 4 is compared, and the controller 32 is used to control the current regulator 41 to adjust the current of the light-emitting branch 4.
  • each light-emitting branch 4 includes a current regulator 41.
  • the current regulator 41 uses a second transistor as the adjustment device.
  • the second transistor may be a field effect tube, and the field effect tube may be a P-type metal oxide.
  • the object semiconductor field effect transistor may also be an N-type metal oxide semiconductor field effect transistor.
  • a field effect tube is used as an example.
  • Each light-emitting branch uses a P-type metal oxide semiconductor field effect tube as a regulating device.
  • the current regulator 41 realizes real-time adjustment by controlling the opening degree of the P-type metal oxide semiconductor field effect tube.
  • the current flowing through the light-emitting branch 4 finally realizes real-time control of the brightness of each light-emitting branch 4, so that each light-emitting branch maintains uniform brightness.
  • the backlight adjustment circuit further includes a memory 5 to provide electrical parameter data for the reference electrical information circuit 1.
  • the memory may be a non-volatile memory such as a read-only memory, a programmable read-only memory, an electrically programmable read-only memory, and an electrically erasable programmable read-only memory.
  • the reference electrical information circuit 1 reads the electrical parameter data set in the memory 5 in advance, thereby providing the reference electrical parameter information to the main control circuit 3, so that the main control circuit 3 compares the electrical information of the light-emitting branch.
  • the voltage value provided by the reference voltage information is the same as the feedback voltage value when the light-emitting branch operates normally.
  • the electrical information comparator 31 includes a voltage comparator; the reference electrical information circuit 1 includes a reference voltage circuit, and the reference electrical parameter information includes reference voltage information.
  • the resistance R of each light-emitting branch is grounded, and the feedback selection circuit 2 feeds back the voltage information of the remote end of the resistance to the main control circuit 3.
  • the voltage provided by the reference voltage circuit 1 is the same as the voltage value of the resistance during normal operation of the light-emitting branch.
  • the voltage feedback circuit may be designed to feed back the voltage values of other parts of the light-emitting branch, and only need to refer to the reference voltage value provided by the electrical information circuit 1 to be preset to the light-emitting branch 4
  • the voltage value of this part can be the same during normal operation.
  • the backlight adjustment process is as follows: the reference electrical information circuit 1 reads data from the memory 5, generates reference voltage information, and provides the reference voltage to the main control circuit 3.
  • the main control circuit 3 sends a feedback control signal corresponding to each light-emitting branch 4 to the feedback selection circuit 2 to turn on the corresponding feedback branch and extract the electrical information of the corresponding light-emitting branch 4.
  • each feedback branch corresponds to a row branch in the feedback selection circuit 2, that is, the feedback branches A1 to A4 respectively correspond to the first row branch to the fourth row branch ,
  • the arrangement of the transistors of each row branch corresponds to a binary number, and the 0 and 1 of the binary number can be expressed by low and high levels. Therefore, only the control terminals of each column of transistors are connected to the main control A corresponding feedback control terminal on the circuit 3, the main control circuit 3 outputs a binary high and low level combination signal corresponding to the feedback branch, so that the corresponding feedback branch can be turned on, as shown in FIG.
  • the main control circuit 3 extracts the working electrical information of the light-emitting branch CH1 and compares it with the reference electrical information, and adjusts the brightness of the light-emitting branch according to the comparison result.
  • the feedback selection circuit 2 feeds back the working voltage of the light-emitting branch 4 as an example
  • the first light-emitting branch CH1 corresponds to the feedback branch A1
  • the corresponding current regulating device 41 is a metal oxide semiconductor field effect
  • the tube M1 if the voltage value fed back by the feedback branch A1 is higher than the reference voltage value, the voltage applied to the control terminal of the metal oxide semiconductor field effect tube M1 is reduced, so that the current passing through the metal oxide semiconductor field effect tube M1 is reduced, thereby Reduce the luminous brightness of the corresponding light-emitting branch CH1; if the feedback voltage value is lower than the reference voltage value, increase the voltage of the control terminal of the metal oxide semiconductor field effect transistor M1, so that the current through the metal oxide semiconductor field effect transistor M1 increases, thereby Increase the light-emitting brightness of the corresponding light-emitting branch CH1; if the feedback voltage value is equal to the reference voltage, there is no need to adjust the branch.
  • the main control circuit 3 outputs a feedback control signal of "01", that is, the feedback control terminal C outputs a low level, the feedback control terminal D outputs a high level, the feedback branch A2 is turned on, and the main control circuit 3 extracts the feedback of the light-emitting branch CH2
  • the voltage value is compared with the reference voltage, and according to the comparison result, the light-emitting branch CH2 is adjusted in the same manner as the aforementioned adjustment method for the light-emitting branch CH1.
  • the main control circuit 3 outputs a feedback control signal of "10”, that is, the feedback control terminal C outputs a high level, and the feedback control terminal D outputs a low level, so that the feedback branch A3 is turned on, and the main control circuit 3 extracts light Feedback voltage value of branch CH3.
  • the main control circuit 3 outputs a feedback control signal of "11”, that is, both the feedback control terminal C and the feedback control terminal D output a high level, the feedback branch A4 is turned on, and the main control circuit 3 extracts the feedback voltage value of the light-emitting branch CH4, In this way, the feedback voltage value of each light-emitting branch is extracted cyclically to adjust the current of each feedback branch.
  • the adjustment process described in this embodiment can realize real-time adjustment of the current of each light-emitting branch, and because the light-emitting diode is a current device, its light-emitting brightness is positively correlated with the current flowing through it, therefore, it can achieve The luminous brightness is adjusted in real time, so that the brightness of each luminous branch is uniform, and the backlight illuminates uniformly.
  • the backlight adjustment method can be deduced by analogy, and will not be repeated here.
  • the feedback control signal of the main control circuit 3 of this embodiment expresses the "0" in the binary number at a low level and the "1" in the binary number at a high level, which is not actually limited to this. You can use high level to express "0", low level to express "1", or any other two signals that can be distinguished from each other, just adjust the N metal oxide semiconductor field effect transistor and P in the feedback selection circuit 2 accordingly
  • the arrangement of the metal oxide semiconductor field effect transistors is such that the corresponding feedback branch can be turned on under the corresponding feedback control signal.
  • the light-emitting branch of the backlight adjustment circuit provided by the present application can be expanded to a larger number of light-emitting branches.
  • the light-emitting device uses a light-emitting diode to emit light
  • the adjustment device on the branch is a metal oxide semiconductor field effect tube
  • the feedback selection circuit 2 uses an NP type metal oxide semiconductor field effect tube matrix composed of an N-type metal oxide semiconductor field effect tube and a P-type metal oxide semiconductor field effect tube.
  • the N-type metal oxide semiconductor field effect transistor is denoted by N
  • the P-type metal oxide semiconductor field effect transistor is denoted by P
  • the feedback selection circuit 2 is a matrix of 8 rows ⁇ 3 columns, and the first row to The transistors in the eighth row are arranged in the order of PPP, PPN, PNP, PNN, NPP, NPN, NNP, NNN, that is, corresponding to the order of binary numbers 000, 001, 010, 011, 100, 101, 110, 111.
  • Each row of metal oxide semiconductor field effect transistors are connected in series to form a row branch, which is the first row branch to the eighth row branch, that is, the A1 to A7 branch in the figure, the first to eighth row branch
  • the input terminals are connected to the corresponding light-emitting branches in turn, the output terminals are connected to the common output terminal, and then connected to the feedback receiving terminal S of the main control circuit 3, and the control terminal of each column of metal oxide semiconductor field effect transistors is connected to the common control terminal It is then connected to a corresponding feedback control terminal on the main control circuit 3, which are respectively a feedback control terminal C, a feedback control terminal D and a feedback control terminal E.
  • the feedback control terminal of the main control circuit 3 sends out a corresponding control signal, which can control the voltage feedback circuit to perform voltage feedback on the corresponding light-emitting branch 4, and then obtain a comparison result by comparing with the reference voltage information, and perform brightness on each light-emitting branch 4. Adjust to maintain backlight uniformity.
  • the feedback selection circuit 2 Through the conversion of the feedback selection circuit 2, it only needs to occupy the four feedback interfaces of the main control circuit 3, and the traditional feedback circuit, if you need to feedback for each channel, you need eight feedback interfaces, it can be seen that with the feedback selection circuit 2, Reduce the number of interfaces where the voltage feedback circuit is connected to the main control circuit 3.
  • this embodiment provides another embodiment for expanding the number of light-emitting branches.
  • each group is independently connected to the main control circuit 3 according to the connection mode of the four light-emitting branches, that is: the feedback selection circuit 2 of each group of voltage feedback circuits is in a matrix of 4 rows ⁇ 2 columns Arrangement, each row is arranged in the manner of PP, PN, NP, NN, that is, the order corresponding to the binary numbers 00, 01, 10, and 11.
  • Each row of metal oxide semiconductor field effect transistors is connected in series to form a row branch, which is respectively a first row branch to a fourth row branch, and the input ends of the first to fourth row branches are respectively connected to corresponding light-emitting branches ,
  • the output terminal is connected to the common output terminal and is connected to the feedback receiving terminal S1 of the main control circuit 3, and the control terminal of each column of transistors is connected to the common control terminal and a corresponding feedback control terminal on the main control circuit 3, that is, the feedback control terminal C and feedback control terminal D.
  • the other group also arranges the field effect transistors into the feedback selection circuit 2 in the same way, and is connected to the feedback receiving end S2, the feedback control end E and the feedback control end F of the main control circuit. In this way, the main control circuit 3 can also adjust the brightness of each light-emitting branch in real time, so as to keep the backlight to emit light uniformly. Compared with the connection method of the traditional voltage feedback circuit, the number of interfaces can also be saved.
  • a backlight module includes the backlight adjustment circuit and a plurality of optical films provided in any of the above embodiments, wherein the backlight adjustment circuit includes a reference electrical information circuit, a feedback selection circuit, a main control circuit, and at least two parallel light emitting circuits Slip road.
  • the present application also provides a display device including the backlight adjustment circuit or the backlight module provided in any one of the foregoing embodiments.
  • the display device provided in this embodiment may be any display device including a backlight, such as a liquid crystal display television or a liquid crystal display.

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Abstract

一种背光调节电路，包括：参考电信息电路（1）、反馈选择电路（2）、主控电路（3）以及至少两路互相并联的发光支路（4）；参考电信息电路（1）与主控电路（3）连接，设置为向主控电路（3）提供参考电参数信息；反馈选择电路（2）分别与主控电路（3）和发光支路（4）连接，设置为向主控电路（3）提供每一路发光支路（4）的电信息；主控电路（3）与发光支路（4）连接，设置为根据参考电参数信息和发光支路（4）的电信息调节每一路发光支路（4）的电流大小。

Description

背光调节电路、背光模组及显示装置
本申请要求于2018年11月12日提交中国专利局，申请号为2018113394194，申请名为“背光调节电路及显示装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及一种背光调节电路、背光模组及显示装置。
背景技术
这里的陈述仅提供与本申请有关的背景信息，而不必然地构成现有技术。
液晶显示装置是目前平板显示的主流产品，由于液晶本身并不发光，为进行显示，需要与背光源搭配。而背光的均匀性是影响液晶显示效果的重要因素之一，申请人意识到，传统的背光架构在制作完毕之后很难对背光亮度进行调整，很容易出现背光不均匀的现象，对显示效果产生消极影响。
申请内容
根据本申请公开的各种实施例，提供一种背光调节电路及显示装置。
一种背光调节电路，包括：参考电信息电路、反馈选择电路、主控电路以及至少两路互相并联的发光支路；
参考电信息电路与主控电路连接，用于向主控电路提供参考电参数信息；反馈选择电路分别与主控电路和发光支路连接，用于向主控电路提供每一路发光支路的电信息；主控电路与发光支路连接，用于根据参考电参数信息和发光支路的电信息调节每一路发光支路的电流大小。
在其中一些实施例中，反馈选择电路包括设置为选通发光支路的矩阵电路，矩阵电路包含呈矩阵排列的若干个第一晶体管。
在其中一些实施例中，矩阵电路的行数与发光支路的数量相对应，每行 第一晶体管串联为行支路，行支路的输入端与各自对应的发光支路连接，输出端与主控电路的反馈接收端连接。
在其中一些实施例中，矩阵电路的列数与以2为底的发光支路数量的对数相对应，每列第一晶体管的控制端与主控电路上对应的反馈控制端连接。
在其中一些实施例中，发光支路包括电流调节器和发光器件，主控电路包括电信息比较器和控制器；电信息比较器设置为将参考电参数信息和发光器件的电信息进行比较，得到比较结果；控制器设置为根据比较结果控制电流调节器，对发光器件进行亮度调节。
在其中一些实施例中，发光器件包括一个或者多个串联的发光二极管。
在其中一些实施例中，发光器件包括一个或者多个串联的冷阴极荧光管。
在其中一些实施例中，电信息比较器包括电压比较器；参考电信息电路包括参考电压电路，参考电参数信息包括参考电压信息。
在其中一些实施例中，电信息比较器包括电流比较器，参考电信息电路包括参考电流电路，参考电参数信息包括参考电流信息。
在其中一些实施例中，电流调节器包括与发光二极管的第二晶体管，第二晶体管受控于控制器。
在其中一些实施例中，第二晶体管包括场效应管。
在其中一些实施例中，还包括存储器，设置为存储向参考电压电路提供的参考电压信息。
在其中一些实施例中，参考电压信息提供的电压值与发光支路正常工作时的反馈电压值相同。
在其中一些实施例中，发光二极管与电阻串联接地。
在其中一些实施例中，反馈选择电路与电阻的远地端连接，设置为采集电阻上的电压信息。
本申请还提供一种背光模组，包括背光调节电路和若干光学膜片，其中，背光调节电路包括参考电信息电路、反馈选择电路、主控电路以及至少两路互相并联的发光支路；参考电信息电路与主控电路连接，设置为向主控电路 提供参考电参数信息；反馈选择电路分别与主控电路和发光支路连接，设置为向主控电路提供每一路发光支路的电信息；主控电路与发光支路连接，设置为根据参考电参数信息和发光支路的电信息调节每一路发光支路的电流大小。
在其中一些实施例中，背光调节电路的反馈选择电路包括设置为选通发光支路的矩阵电路，矩阵电路包含呈矩阵排列的若干个第一晶体管。
在其中一些实施例中，背光调节电路的矩阵电路设有与发光支路数量相对应的行数，每行第一晶体管串联为行支路，行支路的输入端与各自对应的发光支路连接，输出端与主控电路的反馈接收端连接。
在其中一些实施例中，背光调节电路的矩阵电路的列数与以2为底的发光支路数量的对数相对应，每列第一晶体管的控制端与主控电路上对应的反馈控制端连接。
一种显示装置，包括液晶面板及上述背光模组。
本申请提供的一种背光调节电路，通过设置反馈选择电路，能够将每个发光支路工作的电信息向主控电路反馈，主控电路通过将反馈电信息与参考电参数信息进行比较，做出控制判断，实现对每个发光支路电流值的控制，进而实现对每个发光支路亮度的控制，从而得到均匀发光的背光源。另一方面，与传统的反馈电路相比，由于采用了反馈选择电路，能够节省连接到主控电路的接口数。
本申请的一个或多个实施例的细节在下面的附图和描述中提出。本申请的其它特征和优点将从说明书、附图以及权利要求书变得明显。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提 下，还可以根据这些附图获得其它的附图。
图1为根据一个或多个实施例中背光调节的结构框图。
图2为根据一个或多个实施例中背光调节电路的电路结构图。
图3为根据一个或多个实施例中背光调节电路的电路结构图。
图4为另一个实施例中背光调节电路的电路结构图。
具体实施方式
为了使本申请的技术方案及优点更加清楚明白，以下结合附图及实施例，对本申请进行进一步详细说明。应当理解，此处描述的具体实施例仅仅用以解释本申请，并不用于限定本申请。
本申请提供的背光调节电路，可以应用于显示技术领域。随着液晶面板的普及，大众对液晶显示器的画质要求越来越高，而液晶面板本身并不发光，需要背光支持才能进行显示。背光的质量对液晶显示器的显示画质起到重要的影响，而背光的均匀性则是衡量背光质量的重要因素之一。在一些技术中，调节背光均匀性需要将背光的每一个发光支路与主控电路连接以反馈相关信息，这样会占用很多主控电路的反馈接口。
在一个实施例中，如图1所示，提供了一种背光调节电路，包括：参考电信息电路1、反馈选择电路2、主控电路3以及至少两路互相并联的发光支路4；参考电信息电路1与主控电路3连接，用于向主控电路3提供参考电参数信息；反馈选择电路2分别与主控电路3和发光支路4连接，用于向主控电路3提供每一路发光支路4的电信息；主控电路3与发光支路4连接，用于根据参考电参数信息和发光支路4的电信息调节每一路发光支路4的电流大小。
其中，发光支路4工作时发光，提供光源，发光支路4可以包含任意发光器件，比如发光二极管、有机发光二极管或者冷阴极荧光管等发光器件。参考电信息电路1向主控电路3提供维持发光支路4工作的参考电参数信息，参考电参数信息可以是电压信息，也可以是电流信息，甚至可以是功率信息。 反馈选择电路2能够在主控电路3控制下选通一条发光支路4，从而采集该发光支路4的电信息并将该电信息反馈到主控电路3。反馈选择电路2所反馈的发光支路4的电信息可以是电压信息，也可以是电流信息，甚至可以是功率信息，与参考电参数信息对应即可，以使主控电路3能将发光支路4的电信息与参考电参数信息进行比较，即若参考电参数信息是电压信息，则反馈选择电路2也设置为反馈发光支路4的电压信息；同理，若参考电参数信息是电流信息，则反馈选择电路2反馈的发光支路4的电信息也是电流信息。主控电路3通过将参考电参数信息与发光支路4的电信息做比较，判断出发光支路4是否需要进行调节，从而控制发光支路的发光亮度。
本实施例中，设置反馈选择电路2，能够将每个发光支路4的电信息向主控电路3反馈，主控电路3通过将反馈的电信息与参考电参数信息进行比较，作出控制判断，实现对每个发光支路4电流值的控制，进而实现对每个发光支路4的亮度控制，从而得到均匀发光的背光源。由于主控电路3的接口有限，往往需要预留出接口供其他电路连接，因此，与传统的背光调节电路相比，本实施例采用了反馈选择电路2，只需将主控电路3与反馈选择电路2连接，而不必与每条发光支路4都连接，能够节省连接到主控电路3的接口数。
在一些实施例中，如图2所示，以4个发光支路为例，一个发光支路4为灯条上的一个灯串，包括若干个串联的发光器件，串联有开关器件以及电阻R，发光器件可选为采用发光二极管。发光支路CH1至CH4分别通过反馈支路A1、A2、A3和A4与反馈选择电路2连接。在传统的反馈电路中，如果需要对每一路都进行反馈，则每一路反馈支路都各需要占用主控电路3的一个接口，本实施例中通过反馈选择电路2的转换，只需占用主控电路3三个接口，可以减少连接到主控电路3上的接口数。
反馈选择电路2将每个发光支路4的电信息反馈到主控电路3进行电信息比较，如果与参考电信息不相同，主控电路3则会发出信号，控制开关器件M1至M4，从而控制每个支路上的电流，使得每个发光支路的电流趋于一 致，实现实时控制各发光支路的亮度一致性，保持背光发光均匀。
在其中一个实施例中，反馈选择电路2包括用于选通发光支路的矩阵电路，矩阵电路包含若干个第一晶体管。其中，第一晶体管成阵列排布，形成矩阵电路。矩阵电路的行数为发光支路4的支路数量。矩阵电路的列数为，以发光支路4的支路数量为真数，以2为底数的对数的进一取整数。以4路发光支路为例，则矩阵电路的行数为4，列数为以2为底的支路数量的对数，其结果为2，因此该矩阵电路有2列。同理，以此计算，若是有8个光支路，则矩阵电路的行数是8，列数是3。再比如有6个发光支路，则矩阵电路的行数是6，列数是，以2为底6的对数的进一取整数，即由于该对数是2.6，则进一取整为3，所以该矩阵电路的列数为3。
矩阵电路中第一晶体管的数量则是矩阵电路的行数与列数之积，第一晶体管按上述行数和列数排列。每行第一晶体管串联为行支路，行支路的输入端与各自对应的发光支路4连接，输出端连接到公共输出端后与主控电路3的反馈接收端连接；每列第一晶体管的控制端，连接到公共控制端后与主控电路3上对应的反馈控制端连接。第一晶体管可以是场效应管，场效应管可选为金属氧化物半导体场效应管(MOSFET，Metal-Oxide-Semiconductor Field-Effect Transistor)，由于金属氧化物半导体场效应管的源极和漏极具有对称性，即使两端对调也不会影响器件性能，其导通电阻也非常小，若用在电压反馈电路中，因导通电阻产生的压降对反馈信号的影响小，能够准确地向主控电路3反馈电压信息。
如图2所示，以4个发光支路为例，介绍反馈选择电路2内第一晶体管的排列方式。为简化表达，本实施例中用场效应管进行排列，其中N型场效应管用N表示，P型场效应管用P表示：反馈选择电路2为4行×2列的矩阵，第一行至第四行的场效应管依次按PP、PN、NP、NN的方式排列，若以P对应二进制数0，N对应二进制数1，则场效应管的排列对应二进制数00、01、10、11的顺序。每行场效应管串联成一个行支路，分别为第一行支路至第四行支路，第一至第四行支路的输入端依次分别与发光支路CH1至发光支路CH4连 接，输出端共同连接到主控电路3的反馈接收端S，第一列场效应管的控制端连接到第一公共控制端后与主控电路3上对应的反馈控制端C连接，第二列场效应管的控制端连接到第二公共控制端后与主控电路3上对应的反馈控制端D连接。主控电路3的反馈控制端发出对应的控制信号，能够控制反馈选择电路2对相应的发光支路4进行电信息反馈，再通过与参考电参数信息对比得到对比结果，对每个发光支路4进行亮度调节。
在其中一个实施例中，发光支路4包括电流调节器41和发光器件42，主控电路3包括电信息比较器31和控制器32；电信息比较器31用于将参考电参数信息和发光器件4的电信息进行比较，控制器32用于控制电流调节器41对发光支路4的电流进行调节。如图2所示，每个发光支路4包括一个电流调节器41，电流调节器41采用第二晶体管作为调节器件，第二晶体管可以是场效应管，场效应管又可以是P型金属氧化物半导体场效应管，也可以是N型金属氧化物半导体场效应管。本实施例以场效应管为例，每个发光支路采用P型金属氧化物半导体场效应管作为调节器件，电流调节器41通过控制P型金属氧化物半导体场效应管的开启程度实现实时调节流过发光支路4的电流，最终实现对各个发光支路4的亮度的实时控制，使得各发光支路保持亮度均匀。
在其中一个实施例中，背光调节电路还包括存储器5，为参考电信息电路1提供电参数数据。存储器可以是只读存储器、可编程只读存储器、电可编程只读存储器、电可擦除可编程只读存储器等非易失性存储器。参考电信息电路1读取预先设定在存储器5中的电参数数据，从而向主控电路3提供参考电参数信息，以便于主控电路3对发光支路的电信息进行比较。
在其中一个实施例中，参考电压信息提供的电压值与发光支路正常工作时的反馈电压值相同。在本实施例中，电信息比较器31包括电压比较器；参考电信息电路1包括参考电压电路，参考电参数信息包括参考电压信息。每个发光支路上的电阻R接地，反馈选择电路2向主控电路3反馈电阻远地端的电压信息，参考电压电路1提供的电压与发光支路正常工作时电阻上的电 压值相同。
当然，在其他的实施例中，根据实际需要，电压反馈电路可以设计为反馈发光支路的其他部分的电压值，只需参考电信息电路1提供的参考电压值预设为与发光支路4正常工作时该部分的电压值相同即可。
以含有4个发光支路的背光调节电路为例，背光调节的过程为：参考电信息电路1从存储器5中读取数据，产生参考电压信息，提供参考电压给主控电路3。主控电路3向反馈选择电路2发出与每个发光支路4对应的反馈控制信号，以使对应的反馈支路导通，提取对应的发光支路4的电信息。可选地，由于设置了反馈选择电路2，每个反馈支路都对应反馈选择电路2中的一个行支路，即反馈支路A1至A4分别对应第一行支路至第四行支路，而每个行支路的晶体管的排列则对应一个二进制数，而二进制数的0和1可以用低电平和高电平进行表达，因此，只需每一列晶体管的控制端共同连接到主控电路3上对应的一个反馈控制端，主控电路3输出与反馈支路对应的二进制数的高低电平组合信号，即可使对应的反馈支路导通，即如图2所示，主控电路3的输出“00”的反馈控制信号，即反馈控制端C和反馈控制端D都输出低电平，则反馈支路A1导通，向主控电路3的反馈接收端S提供发光支路的工作电信息，主控电路3提取发光支路CH1的工作电信息与参考电信息进行比较，根据比较结果，进行发光支路的亮度调节。以参考电信息电路1提供参考电压，反馈选择电路2反馈发光支路4的工作电压为例，第一发光支路CH1对应反馈支路A1，对应的电流调节器件41为金属氧化物半导体场效应管M1，如果反馈支路A1反馈的电压值高于参考电压值，则降低加在金属氧化物半导体场效应管M1控制端的电压，使通过金属氧化物半导体场效应管M1的电流减小，从而降低对应发光支路CH1的发光亮度；如果反馈电压值低于参考电压值，则提高价值金属氧化物半导体场效应管M1控制端的电压，使通过金属氧化物半导体场效应管M1的电流增加，从而提高对应发光支路CH1的发光亮度；如果反馈电压值等于参考电压，则不需要对该支路进行调整。主控电路3输出“01”的反馈控制信号，即反馈控制端C输出低电平， 反馈控制端D输出高电平，反馈支路A2导通，主控电路3提取发光支路CH2的反馈电压值与参考电压比较，根据比较结果，如前述对发光支路CH1的调整方式一样对发光支路CH2进行调整。如此类推，主控电路3输出“10”的反馈控制信号，即反馈控制端C输出高电平，反馈控制端D输出低电平，则使反馈支路A3导通，主控电路3提取发光支路CH3的反馈电压值。主控电路3输出“11”的反馈控制信号，即反馈控制端C和反馈控制端D都输出高电平，反馈支路A4导通，主控电路3提取发光支路CH4的反馈电压值,如此循环提取各发光支路的反馈电压值进行各反馈支路的电流调节。本实施例介绍的调节过程，可以实现对各个发光支路的电流的实时调节，又因为发光二极管是电流器件，其发光亮度与流过其的电流呈正相关，因此，能够实现对各个发光电路的发光亮度进行实时调节，使得各个发光支路的亮度一致，保持背光发光均匀。其它含有不同发光支路数量的背光调节电路中，背光调节方法可以以此类推，不再赘述。
需要注意的是，本实施例主控电路3的反馈控制信号以低电平表达二进制数中的“0”，以高电平表达二进制数中的“1”，实际并不局限于此，也可以用高电平表达“0”，用低电平表达“1”，或者用其他任意两种能够互相区分的信号，只需对应调整反馈选择电路2中N金属氧化物半导体场效应管和P金属氧化物半导体场效应管的排列方式，使得对应的反馈支路在对应的反馈控制信号下导通即可。
在其中一个实施例中，如图3所示，本申请提供的背光调节电路的发光支路可以拓展更多数量的发光支路，以8个发光支路为例，发光器件采用发光二极管，发光支路上的调节器件选用金属氧化物半导体场效应管，反馈选择电路2采用N型金属氧化物半导体场效应管和P型金属氧化物半导体场效应管组成的N-P型金属氧化物半导体场效应管矩阵，为简化表述，本实施例中N型金属氧化物半导体场效应管用N表示，P型金属氧化物半导体场效应管用P表示：反馈选择电路2为8行×3列的矩阵，第一行至第八行的晶体管依次按PPP、PPN、PNP、PNN、NPP、NPN、NNP、NNN的方式排列，即对应二 进制数000、001、010、011、100、101、110、111的顺序。每行的金属氧化物半导体场效应管串联成一个行支路，分别为第一行支路至第八行支路，即图中的A1至A7支路，第一至第八行支路的输入端依次分别与对应的发光支路连接，输出端共同连接到公共输出端后与主控电路3的反馈接收端S连接，每列金属氧化物半导体场效应管的控制端连接到公共控制端后与主控电路3上对应的一个反馈控制端连接，分别为反馈控制端C、反馈控制端D和反馈控制端E。主控电路3的反馈控制端发出对应的控制信号，能够控制电压反馈电路对相应的发光支路4进行电压反馈，再通过与参考电压信息比较得到比较结果，对每个发光支路4进行亮度调节，保持背光均匀性。通过反馈选择电路2的转换，只需占用主控电路3四个反馈接口，而传统的反馈电路，如果需要对每一路都进行反馈，则需要八个反馈接口，可见，借助反馈选择电路2，减少电压反馈电路连接到主控电路3上的接口数。
在另一个实施例中，如图4所示，以8个发光支路为例，本实施例提供另一种拓展更多发光支路数量的实施方式。以每4个发光支路为一组，每组独立按四个发光支路的连接方式与主控电路3连接，即：每组电压反馈电路的反馈选择电路2以4行×2列的矩阵排列，每行按PP、PN、NP、NN的方式排列，即对应二进制数00、01、10、11的顺序。每行的金属氧化物半导体场效应管串联成一个行支路，分别为第一行支路至第四行支路，第一至第四行支路的输入端分别与对应的发光支路连接，输出端连接到公共输出端后与主控电路3的反馈接收端S1连接，每列晶体管的控制端连接到公共控制端后与主控电路3上对应的一个反馈控制端，即反馈控制端C和反馈控制端D。另一组也以同样的方式将场效应管排列成反馈选择电路2，与主控电路的反馈接收端S2、反馈控制端E和反馈控制端F连接。这样，也能实现主控电路3对各发光支路的亮度进行实时调节，以保持背光发光均匀。相比传统的电压反馈电路的连接方式，也能够节省接口数。
一种背光模组，包括上述任一项实施例提供的背光调节电路和若干光学膜片，其中，背光调节电路包括参考电信息电路、反馈选择电路、主控电路 以及至少两路互相并联的发光支路。
本申请还提供一种显示装置，包括上述任一项实施例提供的背光调节电路或上述背光模组。本实施例提供的显示装置，可以是任何含背光源的显示装置，比如液晶显示电视或者液晶显示器。
以上实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本申请的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干变形和改进，这些都属于本申请的保护范围。因此，本申请专利的保护范围应以所附权利要求为准。

Claims (20)

  1. 一种背光调节电路，包括：
    参考电信息电路、反馈选择电路、主控电路以及至少两路互相并联的发光支路；
    所述参考电信息电路与所述主控电路连接，设置为向所述主控电路提供参考电参数信息；所述反馈选择电路分别与所述主控电路和所述发光支路连接，设置为向所述主控电路提供每一路所述发光支路的电信息；所述主控电路与所述发光支路连接，设置为根据所述参考电参数信息和所述发光支路的电信息调节每一路所述发光支路的电流大小。
  2. 根据权利要求1所述的背光调节电路，其中，所述反馈选择电路包括设置为选通所述发光支路的矩阵电路，所述矩阵电路包含呈矩阵排列的若干个第一晶体管。
  3. 根据权利要求2所述的背光调节电路，其中，所述矩阵电路的行数与所述发光支路的数量相对应，每行所述第一晶体管串联为行支路，所述行支路的输入端与各自对应的发光支路连接，输出端与所述主控电路的反馈接收端连接。
  4. 根据权利要求3所述的背光调节电路，其中，所述矩阵电路的列数与以2为底的所述发光支路数量的对数相对应，每列所述第一晶体管的控制端与所述主控电路上对应的反馈控制端连接。
  5. 根据权利要求4所述的背光调节电路，其中，所述发光支路包括电流调节器和发光器件，所述主控电路包括电信息比较器和控制器；所述电信息比较器设置为将所述参考电参数信息和所述发光器件的电信息进行比较，得到比较结果；所述控制器设置为根据所述比较结果控制所述电流调节器，对所述发光器件进行亮度调节。
  6. 根据权利要求5所述的背光调节电路，其中，所述发光器件包括一个或者多个串联的发光二极管。
  7. 根据权利要求5所述的背光调节电路，其中，所述发光器件包括一个 或者多个串联的冷阴极荧光管。
  8. 根据权利要求6所述的背光调节电路，其中，所述电信息比较器包括电压比较器；所述参考电信息电路包括参考电压电路，所述参考电参数信息包括参考电压信息。
  9. 根据权利要求6所述的背光调节电路，其中，所述电信息比较器包括电流比较器，所述参考电信息电路包括参考电流电路，所述参考电参数信息包括参考电流信息。
  10. 根据权利要求8所述的背光调节电路，其中，所述电流调节器包括与所述发光二极管的第二晶体管，所述第二晶体管受控于所述控制器。
  11. 根据权利要求10所述的背光调节电路，其中，所述第二晶体管包括场效应管。
  12. 根据权利要求11所述的背光调节电路，其中，还包括存储器，设置为存储向所述参考电压电路提供的参考电压信息。
  13. 根据权利要求12所述的背光调节电路，其中，所述参考电压信息提供的电压值与所述发光支路正常工作时的反馈电压值相同。
  14. 根据权利要求13所述的背光调节电路，其中，所述发光二极管与电阻串联接地。
  15. 根据权利要求14所述的背光调节电路，其中，所述反馈选择电路与所述电阻的远地端连接，设置为采集所述电阻上的电压信息。
  16. 一种背光模组，包括背光调节电路和若干光学膜片，其中，背光调节电路包括参考电信息电路、反馈选择电路、主控电路以及至少两路互相并联的发光支路；所述参考电信息电路与所述主控电路连接，设置为向所述主控电路提供参考电参数信息；所述反馈选择电路分别与所述主控电路和所述发光支路连接，设置为向所述主控电路提供每一路所述发光支路的电信息；所述主控电路与所述发光支路连接，设置为根据所述参考电参数信息和所述发光支路的电信息调节每一路所述发光支路的电流大小。
  17. 根据权利要求16所述的背光模组，其中，所述背光调节电路的反馈 选择电路包括设置为选通所述发光支路的矩阵电路，所述矩阵电路包含呈矩阵排列的若干个第一晶体管。
  18. 根据权利要求17所述的背光模组，其中，所述背光调节电路的矩阵电路设有与所述发光支路数量相对应的行数，每行所述第一晶体管串联为行支路，所述行支路的输入端与各自对应的发光支路连接，输出端与所述主控电路的反馈接收端连接。
  19. 根据权利要求18所述的背光模组，其中，所述背光调节电路的矩阵电路的列数与以2为底的所述发光支路数量的对数相对应，每列所述第一晶体管的控制端与所述主控电路上对应的反馈控制端连接。
  20. 一种显示装置，包括液晶面板及权利要求16所述的背光模组。
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