CN111508441A - Mini-L ED backlight source control system and television - Google Patents
Mini-L ED backlight source control system and television Download PDFInfo
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- CN111508441A CN111508441A CN202010326950.9A CN202010326950A CN111508441A CN 111508441 A CN111508441 A CN 111508441A CN 202010326950 A CN202010326950 A CN 202010326950A CN 111508441 A CN111508441 A CN 111508441A
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/64—Constructional details of receivers, e.g. cabinets or dust covers
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Abstract
The invention discloses a Mini-L ED backlight source control system and a television, wherein the Mini-L ED backlight source control system is connected with a display screen and comprises a power panel, a main board, a control panel, a logic board and a light-emitting module provided with a plurality of lamp panels, a scanning switching module and a signal enhancement module are arranged on the control panel, the power panel outputs a voltage signal to the scanning switching module, the main board outputs a low-voltage differential signal to the logic board and outputs an SPI signal to the signal enhancement module, the signal enhancement module outputs an enable signal to the scanning switching module and enhances the SPI signal and then outputs the signal to the lamp panels, the scanning switching module dynamically scans and lightens the lamp panels according to the enable signal and the voltage signal, the logic board decodes the low-voltage differential signal and then drives the display screen to display image pictures, and the invention can ensure the integrity of data transmission by arranging the signal enhancement module.
Description
Technical Field
The invention relates to the technical field of L ED light sources, in particular to a Mini-L ED backlight light source control system and a television.
Background
At present, some TV products adopt Mini-L ED as backlight source display, and Mini-L ED adopts straight following formula, the design of lamp pearl booth apart from, realizes the regional of less within range through the densely covered of a large amount and adjusts luminance, compares in traditional backlight design, can be equipped with better luminance homogeneity, higher color contrast in less mixed light distance, can realize terminal product's ultra-thin design, and save the electric energy.
The existing Mini-L ED backlight control technology adopts a traditional one-to-one control mode, that is, each control lamp zone corresponds to a control channel of 1 constant current driving chip, when the number of partitions reaches more than thousands of zones, the number of constant current control chips will rapidly rise, and the partitions of the screen body are increased, the corresponding SPI (Serial Peripheral Interface) data transmission quantity is large, the speed is high, and the transmission line is long, so that the SPI data transmission process is easily interfered, and abnormal problems such as backlight flicker or screen darkness are caused.
Thus, the prior art has yet to be improved and enhanced.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides a Mini-L ED backlight source control system and a television set, which can effectively ensure the integrity of data transmission.
In order to achieve the purpose, the invention adopts the following technical scheme:
a Mini-L ED backlight source control system is connected with a display screen and comprises a power panel, a main board, a control panel, a logic board and a light-emitting module with a plurality of lamp panels, wherein a scanning switching module and a signal enhancement module are arranged on the control panel, the power panel outputs voltage signals to the scanning switching module, the main board outputs low-voltage differential signals to the logic board and outputs SPI signals to the signal enhancement module, the signal enhancement module outputs enable signals to the scanning switching module and enhances the SPI signals and then outputs the enhanced SPI signals to the lamp panels, the scanning switching module dynamically scans and lightens the lamp panels according to the enable signals and the voltage signals, and the logic board decodes the low-voltage differential signals and drives the display screen to display image pictures.
In the Mini-L ED backlight source control system, the light-emitting module outputs a feedback signal according to the voltage signal and outputs the feedback signal to the power panel through the control panel, and the power panel adjusts the voltage signal according to the feedback signal.
In the Mini-L ED backlight source control system, the power panel and the control panel and the main board are connected in a bridging mode.
In the Mini-L ED backlight source control system, the scanning switching module comprises a scanning switching unit which dynamically scans and lights the lamp panel according to the enabling signal and the voltage signal.
In the Mini-L ED backlight source control system, the signal enhancement module comprises a control unit and a first signal enhancement unit, the control unit outputs the enable signal to the scanning switching unit, sequentially controls the on or off of the scanning switching unit, and outputs the SPI signal to the first signal enhancement unit, and the first signal enhancement unit enhances the SPI signal and then outputs the SPI signal to the lamp panel.
In the Mini-L ED backlight source control system, a constant current control chip and a second signal enhancement unit are further arranged on the lamp panel, the constant current control chip controls the current flowing through the corresponding L ED lamp string according to the SPI signal output by the first signal enhancement unit, and the second signal enhancement unit enhances the SPI signal output by the first signal enhancement unit.
In the Mini-L ED backlight source control system, the scan switching unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, a first MOS transistor, a second MOS transistor, a triode, a diode, and a zener diode;
one end of the first resistor, the collector of the triode, one end of the second resistor and the source of the first MOS tube are all connected with a voltage signal input end; the other end of the first resistor, the cathode of the diode and the cathode of the voltage stabilizing diode are all connected with the base electrode of the triode; an emitting electrode of the triode and one end of the third resistor are both connected with the anode of the diode; the other end of the second resistor and the other end of the third resistor are both connected with the grid electrode of the first MOS tube; the drain electrode of the first MOS tube, one end of the first capacitor and one end of the fourth resistor are all connected with a voltage signal output end, and the other end of the first capacitor and the other end of the fourth resistor are all grounded; the positive pole of zener diode is connected the drain electrode of second MOS pipe, the grid of second MOS pipe, the one end of second electric capacity and the one end of fifth resistance is all connected the one end of sixth resistance, enable signal input part is connected to the other end of sixth resistance, the source electrode of second MOS pipe the other end of second electric capacity and the other end of fifth resistance all ground connection.
In the Mini-L ED backlight source control system, the control unit includes a first control chip, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first fuse, a second fuse, and a light emitting diode;
one end of the seventh resistor is connected to the 1 st pin of the first control chip, one end of the eighth resistor is connected to the 2 nd pin of the first control chip, one end of the ninth resistor is connected to the 3 rd pin of the first control chip, one end of the tenth resistor is connected to the 4 th pin of the first control chip, one end of the eleventh resistor is connected to the 5 th pin of the first control chip, one end of the twelfth resistor is connected to the 6 th pin of the first control chip, one end of the thirteenth resistor is connected to the 8 th pin of the first control chip, one end of the fourteenth resistor is connected to the 9 th pin of the first control chip, and one end of the fifteenth resistor is connected to the 10 th pin of the first control chip; the other end of the seventh resistor, the other end of the eighth resistor, the other end of the ninth resistor, the other end of the tenth resistor, the other end of the eleventh resistor, the other end of the twelfth resistor, the other end of the thirteenth resistor, the other end of the fourteenth resistor and the other end of the fifteenth resistor are all connected with the mainboard; one end of the sixteenth resistor is connected with a pin 44 of the first control chip, the other end of the sixteenth resistor is connected with a BFB signal end, one end of the seventeenth resistor and one end of the third capacitor are connected with a pin 39 of the first control chip, the other end of the seventeenth resistor is connected with power, one end of the fourth capacitor is connected with a pin 38 of the first control chip, and the other end of the third capacitor and the other end of the fourth capacitor are both grounded; one end of the eighteenth resistor is connected with the 35 th pin of the first control chip, one end of the nineteenth resistor is connected with the 34 th pin of the first control chip, one end of the twentieth resistor is connected with the 33 th pin of the first control chip, one end of the twenty-first resistor is connected with the 32 th pin of the first control chip, one end of the twenty-second resistor is connected with the 31 th pin of the first control chip, and the other ends of the eighteenth resistor, the nineteenth resistor, the twentieth resistor, the twenty-first resistor and the twenty-second resistor are all connected with the scanning switching module; one end of the twenty-third resistor is connected with power, the other end of the twenty-third resistor and one end of the sixth capacitor are connected with the 24 th pin of the first control chip, the other end of the sixth capacitor and one end of the fifth capacitor are grounded, and the other end of the fifth capacitor and one end of the twentieth resistor are connected with the 23 th pin of the first control chip; the other end of the twenty-fourth resistor is grounded; a 46 th pin of the first control chip is grounded through the first protective tube, and a 45 th pin of the first control chip is connected with electricity through the second protective tube; the anode of the light emitting diode is connected with the power supply through the twenty-fifth resistor, and the cathode of the light emitting diode is connected with the 27 th pin of the first control chip.
In the Mini-L ED backlight source control system, the first signal enhancement unit includes a second control chip, a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor, a twenty-ninth resistor, a thirty-eleventh resistor, a thirty-second resistor, a thirty-third resistor, a thirty-fourth resistor, a thirty-fifth resistor, a thirty-sixth resistor, a thirty-seventh resistor, a thirty-eighth resistor, a thirty-ninth resistor, a forty-fourth resistor, a forty-first resistor, a forty-second resistor, a forty-third resistor, a forty-fourth resistor, a forty-fifth resistor, a forty-sixth resistor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor, an eighteenth capacitor, a nineteenth capacitor, a twentieth capacitor, a twenty-first capacitor, and a twenty-second capacitor;
one end of the thirty-third resistor is connected with power, the other end of the thirty-third resistor, one end of the seventh capacitor, one end of the eighth capacitor and one end of the thirty-fifth resistor are all connected with the 1 st pin of the control chip, the other end of the thirty-fifth resistor and one end of the thirty-fourth resistor are all connected with the 2 nd pin of the second control chip, and the other end of the thirty-fourth resistor, the other end of the seventh capacitor and the other end of the eighth capacitor are all grounded; a pin 3 of the second control chip is connected to one end of the twenty-sixth resistor and one end of the ninth capacitor, a pin 4 is connected to one end of the twenty-seventh resistor and one end of the tenth capacitor, a pin 5 is connected to one end of the twenty-eighth resistor and one end of the eleventh capacitor, pins 6 and 7 are connected to one end of the twenty-ninth resistor and one end of the twelfth capacitor, a pin 8 is connected to one end of the thirty-third resistor and one end of the thirteenth capacitor, a pin 9 is connected to one end of the thirty-first resistor and one end of the fourteenth capacitor, and a pin 10 is connected to one end of the thirty-second resistor and one end of the fifteenth capacitor; the other end of the twenty-sixth resistor, the other end of the twenty-seventh resistor, the other end of the twenty-eighth resistor, the other end of the twenty-ninth resistor, the other end of the thirty-fifth resistor and the other end of the thirty-sixth resistor are all connected with the control unit; the 14 th pin of the second control chip is connected with one end of a sixteenth capacitor and an SPI signal output end through a forty-sixth resistor, the 15 th pin is connected with one end of a seventeenth capacitor and the SPI signal output end through a forty-fifth resistor, the 16 th pin is connected with one end of an eighteenth capacitor and the SPI signal output end through a forty-fourth resistor, the 17 th pin is connected with one end of a nineteenth capacitor and the SPI signal output end through a forty-third resistor, the 18 th pin is connected with one end of a twentieth capacitor and the SPI signal output end through a forty-second resistor, the 19 th pin is connected with one end of a twenty-first capacitor and the SPI signal output end through a forty-first resistor, the 20 th pin is connected with one end of a twenty-second capacitor and the SPI signal output end through a forty resistor, and the 21 st pin is connected with one end of a twenty-third capacitor and the SPI signal output end through a thirty-ninth resistor, a 22 th pin is connected with one end of the thirty-eighth resistor and one end of the thirty-sixth resistor, and a 23 th pin is connected with the other end of the thirty-sixth resistor, one end of the twenty-fourth capacitor, one end of the twenty-fifth capacitor and one end of the thirty-seventh resistor; the other end of the thirty-seventh resistor is grounded, and the other end of the thirty-eighth resistor, the other end of the twenty-fourth capacitor and the other end of the twenty-fifth capacitor are grounded.
A television comprises a display screen and is characterized by further comprising the Mini-L ED backlight source control system.
Compared with the prior art, the Mini-L ED backlight source control system and the television set are characterized in that the Mini-L ED backlight source control system is connected with a display screen and comprises a power panel, a main board, a control panel, a logic board and a light-emitting module provided with a plurality of lamp panels, a scanning switching module and a signal enhancement module are arranged on the control panel, the power panel outputs voltage signals to the scanning switching module, the main board outputs low-voltage differential signals to the logic board and outputs SPI signals to the signal enhancement module, the signal enhancement module outputs enable signals to the scanning switching module and enhances the SPI signals and then outputs the signals to the lamp panels, the scanning switching module dynamically scans and lights the lamp panels according to the enable signals and the voltage signals, the logic board decodes the low-voltage differential signals and then drives the display screen to display image pictures, and the integrity of data transmission can be ensured through the signal enhancement module.
Drawings
Fig. 1 is a block diagram of a television set according to the present invention;
FIG. 2 is a block diagram of a Mini-L ED backlight control system according to the present invention;
FIG. 3 is a schematic diagram of a power board, a control board and a main board in a Mini-L ED backlight source control system according to the present invention;
FIG. 4 is a schematic circuit diagram of a control unit in the Mini-L ED backlight control system provided by the present invention;
FIG. 5 is a schematic circuit diagram of a first signal enhancement unit in the Mini-L ED backlight source control system according to the present invention;
fig. 6 and 7 are schematic circuit diagrams of two scanning switching units in the Mini-L ED backlight source control system provided by the present invention.
Detailed Description
The invention provides a Mini-L ED backlight source control system and a television, which can effectively ensure the integrity of data transmission.
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 and fig. 2 together, the television set provided by the present invention includes a display screen 10 and a Mini-L ED backlight source control system, the Mini-L ED backlight source control system includes a power board 20, a main board 30, a control board 40, a logic board 50, and a lighting module 60 having a plurality of lamp panels, the power board 20 is connected to the control board 40 and the logic board 50, the control board 40 is connected to the main board 30 and the logic board 50, the logic board 50 is further connected to the display screen 10, the control board 40 is provided with a scan switching module 41 and a signal enhancing module 42, and the scan switching module 41 is connected to the signal enhancing module 42.
The power board 20 outputs a voltage signal to the scan switching module 41, the main board 30 outputs a low voltage differential signal to the logic board 50, and outputs an SPI signal to the signal enhancement module 42; the signal enhancement module 42 outputs an enable signal to the scan switching module 41, and enhances the SPI signal and outputs the enhanced SPI signal to the lamp panel; the scanning switching module 41 dynamically scans and lights the lamp panel according to the enable signal and the voltage signal; the logic board 50 decodes the low-voltage differential level signal and then drives the display screen 10 to display an image, and the signal enhancement module 42 is additionally arranged, so that the problem of signal distortion caused by high transmission frequency and large transmission distance of the SPI signal is solved, and the completeness of signal transmission is ensured.
In specific implementation, the light emitting module 60 is divided into an upper half and a lower half in this embodiment, the upper half of the light emitting module 60 includes lamp panels L BA1, L BA2, … … and L BAn, the lower half of the light emitting module 60 includes lamp panels L BB1, L BB2, … … and L BBn, n is a positive integer, each of the lamp panels is provided with a L ED lamp bead, the power board 20 is further provided with sockets a00, a10 and B, D, the control board 40 is provided with sockets B0, B1, D1, a11, a01, SB1, SB2, FB1, FB2, PB1, PA1, … … and PAn, the main board 30 is provided with sockets D, B2 and L, and the logic board 50 is provided with sockets C0 and L0.
After the television is turned on, the power board 20 outputs a supply voltage to a socket B0 in the control board 40 through a socket B, and then outputs the supply voltage to a socket B2 in the main board 30 through the control board 40 via a socket B1 to supply power to the main board 30; after the main board 30 is powered on and started, the main board 30 enables the power board 20 to output the voltage signal to the scanning switching module 41, and the scanning switching module 41 outputs the voltage signal to the light-emitting module 60 to supply power to the lamp panel in the light-emitting module 60; in this embodiment, the light emitting module 60 is divided into an upper half and a lower half, and the corresponding power board 20 outputs the voltage signal + V1 to the socket a01 of the control board 40 through the socket a00, and supplies power to the lower half of the light emitting module 60 through the scan switching module 41; the power board 20 outputs the voltage signal + V2 to the socket a11 of the control board 40 through the socket a10, and supplies power to the upper half of the light emitting module 60 through the scan switching module 41; meanwhile, the power panel 20 supplies power to the logic board 50 through the socket C, and supplies power required for the operation of the logic board 50.
Furthermore, the main board 30 further outputs SPI signals SP1 and SP2 to the control board 40 through a socket D, the control board 40 receives the SPI signals SP1 and SP2 through a socket D1, and outputs the SPI signals SP1 and SP2 to the signal enhancement module 42, the signal enhancement module 42 enhances the SPI signals SP1 and SP2 and outputs the SPI signals SP1 and SP2 to the lower half of the light emitting module 60 and the upper half of the light emitting module 60 respectively to control the current of the L ED lamp bead on each part of the lamp panel and the on area of the light emitting module 60, and control the current of the L ED lamp bead, that is, to control the brightness of the L ED lamp bead, so as to achieve the partition control and brightness control of the panel, at the same time, the signal enhancement module 42 outputs the enable signal to the scan switching module 41, and further controls the scan switching module 41 to dynamically scan the strings on the scan screen L ED lamp string, while the control board 30 outputs the low voltage differential signal to the logic board 50, and the low voltage logic board 50 outputs the differential display image, wherein the image can be displayed according to the display image, and the differential display screen display image.
The light emitting module 60 outputs a feedback signal according to the voltage signal and outputs the feedback signal to the power panel 20 through the control panel 40, the power panel 20 adjusts the voltage signal according to the feedback signal, specifically, the lower half lamp panel and the upper half lamp panel of the light emitting module 60 respectively output the feedback signal to the control panel 40 through sockets FB1 and FB2, and then the control panel 40 respectively outputs the feedback signal to the power panel 20 through sockets a01 and a11, and the power panel 20 is respectively received by sockets a00 and a10, so that a feedback is performed on the voltage signals + V1 and + V2 output by the power panel 20, and then the power panel 20 adjusts the output voltage signal according to the feedback signal to realize power adjustment, and the problem of temperature rise caused by difference of voltage of L ED lamps in the lamp panel is solved on the premise of ensuring constant current of L ED lamps in the lamp panel.
Further, referring to fig. 3, the power board 20 and the control board 40 and the main board 30 are connected in a bridging manner, specifically, a socket B in the power board 20 and a socket B0 in the control board 40, and a socket B1 in the control board 40 and a socket B2 in the main board 30 are connected in a bridging manner; the output socket B of the power panel 20 supplies power through a wire rod connection mode for the socket B0 of the control panel 40, the power supply of the socket B1 of the control panel 40 is connected to the receiving socket B0 of the control panel 40 through a copper sheet wiring mode, the power supply of the socket B2 of the mainboard 30 is connected with the socket B1 output of the control panel 40 through a wire rod, wherein the control panel 40 is a PCB (printed circuit board), the PCB is used as a connecting wire rod in the process, the power supply of the mainboard 30 is achieved, the length of the wire rod is shortened, the wire rod cost is reduced, and the problems that the number of control connecting wires between the lamp panel and the control panel is increased due to the fact that the number of the backlight source partitions is large are solved, and the number of the wires in the.
Further, please continue to refer to fig. 2, the scan switching module 41 includes a scan switching unit 411; the scanning switching unit 411 dynamically scans and lights the lamp panel according to the enable signal and the voltage signal, and the scanning switching unit 411 is connected with the power panel 20 and the signal enhancement module 42; specifically, in this embodiment, the lighting device includes two scanning switching units 411, one scanning switching unit 411 outputs the voltage signal + V1 to the bottom half lamp panel of the lighting module 60 for supplying power, and controls the on/off of the top half lamp panel of the lighting module 60 according to the enable signal, and the other scanning switching unit 411 outputs the voltage signal V2 to the top half lamp panel of the lighting module 60 for supplying power, and controls the on/off of the bottom half lamp panel of the lighting module 60 according to the enable signal; the signal enhancement module 42 controls the two scanning switching units 411 to dynamically scan and light the lamp panel by outputting the enable signal to the two scanning switching units 411.
Further, referring to fig. 4 and fig. 5, the signal enhancement module 42 includes a control unit 421 and a first signal enhancement unit 422, the control unit 421 is connected to the main board 30 and the first signal enhancement unit 422, and the first signal enhancement unit 422 is further connected to the light emitting module 60; the control unit 421 outputs the enable signal to each of the scan switching units 411, sequentially controls the scan switching units 411 to be turned on or off, and outputs the SPI signal to the first signal enhancement unit 422; the first signal enhancement unit 422 enhances the SPI signal and outputs the enhanced SPI signal to the lamp panel; when one of the scan switching units 411 is turned on, the voltage signal + V1 is output to the bottom half lamp panel of the light emitting module 60 to supply power, and when the scan switching unit is turned off, the power is not supplied; when the other scanning switching unit is switched on, the voltage signal + V2 is output to the upper half lamp panel of the light-emitting module 60 to supply power, and when the scanning switching unit is switched off, the voltage signal + V2 is not supplied with power; therefore, the control unit 421 controls the scan switching unit 411 to be turned on or off in sequence, so as to realize dynamic scan control of the lamp panel; and through the signal enhancement unit will SPI signal reinforcement output gives the lamp plate can avoid the signal distortion in transmission process, ensures signal transmission's integrality.
The lamp panel is further provided with a constant current control chip and a second signal enhancement unit, the constant current control chip is connected with the first signal enhancement unit 422 and the second signal enhancement unit, the second signal enhancement unit is further connected with a lamp bead, the constant current control chip is used for controlling current flowing through a corresponding L ED lamp string according to the SPI signal output by the first signal enhancement unit 422, the second signal enhancement unit enhances the SPI signal output by the first signal enhancement unit 422, the structure of the second signal enhancement unit is the same as that of the first signal enhancement unit 422, the second signal enhancement unit with the same structure as that of the first signal enhancement unit 422 is arranged at the constant current control chip, and after the received SPI signal is enhanced by the second signal enhancement unit, the distortion of the SPI signal in the transmission process is further ensured, the integrity of signal transmission is further improved, and the problems of backlight flicker or screen dark are avoided.
The light emitting module 60 comprises a plurality of lamp panels, and each lamp panel is provided with the constant current control chip and the second signal enhancement unit; the constant current control chip outputs the feedback signals in each lamp panel, the feedback signals output by the constant current control chip in each lamp panel are connected in parallel, namely, the feedback signals FB11, FB12, FB13, …, FB1m of the constant current control chips on the lower half lamp panel and the feedback signals FB21, FB22, FB23, …, FB2m of the constant current control chips on the upper half lamp panel of the light emitting module 60 are finally connected in parallel into two feedback signals, i.e. FB1 and FB2, m is a positive integer and represents the number of the constant current control chips, then FB1 and FB2 signals are respectively fed back to the power panel 20 through the control panel 40 to participate in the feedback regulation of the power supply, the power panel 20 adjusts the output voltage signal according to the lamp bead specification difference of the lamp panel of the screen body, and the temperature rise of the constant current control chip is the lowest on the premise of ensuring the constant current of the lamp panel lamp bead.
Further, referring to fig. 6 and 7, the scan switch unit 411 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a first MOS transistor M1, a second MOS transistor M2, a transistor Q1, a diode D1, and a zener diode ZD 1; one end of the first resistor R1, the collector of the triode Q1, one end of the second resistor R2 and the source of the first MOS transistor M1 are all connected with a voltage signal input end; the other end of the first resistor R1, the cathode of the diode D1 and the cathode of the zener diode ZD1 are all connected with the base of the triode Q1; an emitter of the triode Q1 and one end of the third resistor R3 are both connected with the anode of the diode D1; the other end of the second resistor R2 and the other end of the third resistor R3 are both connected with the gate of the first MOS transistor M1; a drain electrode of the first MOS transistor M1, one end of the first capacitor C1 and one end of the fourth resistor R4 are all connected to a voltage signal output end, and the other end of the first capacitor C1 and the other end of the fourth resistor R4 are all grounded; the anode of the zener diode ZD1 is connected to the drain of the second MOS transistor M2, the gate of the second MOS transistor M2, one end of the second capacitor C2, and one end of the fifth resistor R5 are all connected to one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected to an enable signal input end, and the source of the second MOS transistor M2, the other end of the second capacitor C2, and the other end of the fifth resistor R5 are all grounded, in this embodiment, the circuit structures of the two scan switching units 411 are completely the same, one scan switching unit 411 transmits the voltage signal + V1, and the other scan switching unit transmits the voltage signal + V2, as shown in fig. 6 and 7. The enable signal output by the control unit 421 passes through the enable signal input end to the scanning switching unit 411, and controls the on/off of the scanning switching unit 411 by controlling the on/off of the first MOS transistor, thereby realizing dynamic scanning control of the lamp panel.
The control unit 421 includes a first control chip U1, a seventh resistor R1, an eighth resistor R1, a ninth resistor R1, a tenth resistor R1, an eleventh resistor R1, a twelfth resistor R1, a thirteenth resistor R1, a fifteenth resistor R1, a sixteenth resistor R1, a nineteenth resistor R1, a twentieth resistor R1, a twenty-first resistor R221, a twenty-second resistor R1, a twenty-third resistor R1, a twenty-fourth resistor R1, a twenty-fifth resistor R1, a third capacitor C1, a fourth capacitor C1, a fifth capacitor C1, a sixth capacitor C1, a first fuse tube F72, a second fuse tube F1 and a light emitting diode F1, a twenty-fifth resistor R1, a twenty-resistor R1, a fifth resistor R1, a fifth resistor R1, a fifth resistor R1, a fifth resistor R1, a fifth resistor R1, a fifth resistor R1, a fifth 1, a resistor R1, a fifth resistor R1, a fifth 1, a resistor R1, a fifth resistor R1, a fifth 1, a resistor R1, a fifth 1, a resistor R1, a fifth resistor R1, a fifth 1, a resistor R1, a fifth 1, a.
The 1 st, 2 nd, 3 rd, 4 th, 5 th, 7 th, 8 th, 9 th and 10 th pins of the first control chip U1 receive the SPI signal output by the motherboard 30 to the socket D1 of the control board 40 through the socket D, and then are output to the first signal enhancement unit 422 through the 14 th, 16 th, 18 th, 20 th, 22 th, 28 th and 30 th pins of the first control chip U1.
Still further, referring to fig. 5, the first signal enhancement unit 422 includes a second control chip U2, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a thirty-fifth resistor R30, a thirty-eleventh resistor R31, a thirty-second resistor R31, a thirty-third resistor R31, a thirty-fourth resistor R31, a thirty-fifth resistor R31, a thirty-sixth resistor R31, a thirty-seventh resistor R31, a thirty-eighth resistor R31, a thirty-ninth resistor R31, a forty-fourth resistor R31, a forty-second resistor R31, a forty-third resistor R31, a forty-fourth resistor R31, a forty-fifth resistor R31, a forty-sixth resistor R31, a seventh capacitor C31, an eighth capacitor C31, a ninth capacitor C31, a tenth capacitor C72, a twelfth capacitor C72, a fourteenth capacitor C31, a fifteenth capacitor C31, a fourteenth capacitor C31, a capacitor C31, A sixteenth capacitor C16, a seventeenth capacitor C17, an eighteenth capacitor C18, a nineteenth capacitor C19, a twentieth capacitor C20, a twenty-first capacitor C21, and a twenty-second capacitor C22.
In the first embodiment, the other terminal of the twenty-third resistor R is connected to the ground, the other terminal of the thirty-third resistor R, the one terminal of the seventh capacitor C, the one terminal of the eighth capacitor C and the one terminal of the thirty-fifth resistor R are all connected to the 1 st pin of the second control chip U, the other terminal of the thirty-fifth resistor R and the one terminal of the thirty-fourth resistor R are all connected to the 2 nd pin of the second control chip U, the other terminal of the thirty-fourth resistor R, the other terminal of the seventh capacitor C and the other terminal of the eighth capacitor C are all connected to the ground, the 3 rd pin of the second control chip U is connected to the one terminal of the twenty-sixth resistor R and the one terminal of the ninth capacitor C, the 4 th pin is connected to the one terminal of the twenty-seventh resistor R and the one terminal of the tenth capacitor C, the 5 th pin is connected to the one terminal of the twenty-eighth resistor R and the one terminal of the eleventh capacitor C, the 6 th pin and the 7 th pin are connected to the one terminal of the twenty-ninth resistor R and one terminal of the twelfth capacitor C, the one terminal of the thirty-eighth resistor C and the one terminal of the thirty-eighth capacitor C, the other terminal of the twenty-eighth capacitor C are connected to the signal output terminal of the twenty-eighth signal-SPI-C, the twenty-SPI-C, the twenty-SPI-C, the twenty-SPI-C, the one of the twenty-SPI-C, the twenty-SPI-C, the twenty-C, the signal-C, the twenty-C, the twenty-C is connected to the one of the twenty-C.
The 3 rd pin, the 4 th pin, the 5 th pin, the 6 th pin, the 7 th pin, the 8 th pin, the 9 th pin and the 10 th pin of the second control chip U2 receive the SPI signal, and output the SPI signal SP1 to the upper half lamp panel of the light-emitting module 60 through the 18 th pin, the 19 th pin, the 20 th pin and the 21 st pin; the second control chip U2 outputs SPI signals SP2 to a lower half lamp panel of the light emitting module 60 through a 14 th pin, a 15 th pin, a 16 th pin and a 17 th pin.
Further, the invention also provides a Mini-L ED backlight source control system, which is not described herein again because the Mini-L ED backlight source control system has been described in detail above.
The Mini-L ED backlight source control system provided by the invention adopts a mode of combining the control unit and the signal enhancement unit, thoroughly solves the problem of signal distortion caused by high transmission frequency and large transmission distance of SPI signals, ensures the integrity of signal transmission, realizes dynamic scanning control of lighting of the lamp panel by the mainboard, thoroughly solves the problems of multiple connecting lines between the lamp panel and the control panel and complex process in the traditional Mini-L ED product, greatly improves the producibility of a Mini-L ED whole machine, and solves the problems of temperature rise of the lamp panel and a constant current control chip of a light-emitting module by introducing the feedback signal of the constant current control chip in the lamp panel to participate in adjusting the voltage signal output by a power supply.
In summary, the Mini-L ED backlight source control system and the television provided by the invention are connected with a display screen and comprise a power panel, a main board, a control panel, a logic board and a light-emitting module provided with a plurality of lamp panels, wherein the control panel is provided with a scanning switching module and a signal enhancement module, the power panel outputs a voltage signal to the scanning switching module, the main board outputs a low-voltage differential signal to the logic board and outputs an SPI signal to the signal enhancement module, the signal enhancement module outputs an enable signal to the scanning switching module and outputs the SPI signal to the lamp panels after enhancement, the lamp panels are dynamically scanned and lightened by the scanning switching module according to the enable signal and the voltage signal, and the logic board decodes the low-voltage differential signal and then drives the display screen to display image pictures, so that the completeness of data transmission can be ensured, the internal wires of the whole television can be shortened, and the cost is reduced.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (10)
1. A Mini-L ED backlight source control system is connected with a display screen and is characterized by comprising a power panel, a main board, a control panel, a logic board and a light emitting module comprising a plurality of lamp panels, wherein a scanning switching module and a signal enhancement module are arranged on the control panel, the power panel outputs voltage signals to the scanning switching module, the main board outputs low-voltage differential signals to the logic board and outputs SPI signals to the signal enhancement module, the signal enhancement module outputs enable signals to the scanning switching module and enhances the SPI signals and then outputs the enhanced SPI signals to the lamp panels, the scanning switching module dynamically scans and lights the lamp panels according to the enable signals and the voltage signals, and the logic board decodes the low-voltage differential signals and then drives the display screen to display image pictures.
2. The Mini-L ED backlight source control system according to claim 1, wherein the light emitting modules output feedback signals according to the voltage signals and output to the power board through the control board, and the power board adjusts the voltage signals according to the feedback signals.
3. The Mini-L ED backlight source control system according to claim 1, wherein the power board and the control board and the main board are connected by bridge connection.
4. The Mini-L ED backlight source control system according to claim 1, wherein the scan switch module includes a scan switch unit, and the scan switch unit dynamically scans and lights the lamp panel according to the enable signal and the voltage signal.
5. The Mini-L ED backlight source control system according to claim 4, wherein the signal enhancement module includes a control unit and a first signal enhancement unit, the control unit outputs the enable signal to the scan switching unit, sequentially controls the scan switching unit to be turned on or off, and outputs the SPI signal to the first signal enhancement unit, and the first signal enhancement unit enhances the SPI signal and outputs the SPI signal to the lamp panel.
6. The Mini-L ED backlight source control system according to claim 5, wherein the lamp panel is further provided with a constant current control chip and a second signal enhancement unit, the constant current control chip controls the current flowing through the corresponding L ED lamp string according to the SPI signal outputted from the first signal enhancement unit, and the second signal enhancement unit enhances the SPI signal outputted from the first signal enhancement unit.
7. The Mini-L ED backlight source control system of claim 4, wherein the scan switch unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, a first MOS transistor, a second MOS transistor, a triode, a diode and a zener diode;
one end of the first resistor, the collector of the triode, one end of the second resistor and the source of the first MOS tube are all connected with a voltage signal input end; the other end of the first resistor, the cathode of the diode and the cathode of the voltage stabilizing diode are all connected with the base electrode of the triode; an emitting electrode of the triode and one end of the third resistor are both connected with the anode of the diode; the other end of the second resistor and the other end of the third resistor are both connected with the grid electrode of the first MOS tube; the drain electrode of the first MOS tube, one end of the first capacitor and one end of the fourth resistor are all connected with a voltage signal output end, and the other end of the first capacitor and the other end of the fourth resistor are all grounded; the positive pole of zener diode is connected the drain electrode of second MOS pipe, the grid of second MOS pipe, the one end of second electric capacity and the one end of fifth resistance is all connected the one end of sixth resistance, enable signal input part is connected to the other end of sixth resistance, the source electrode of second MOS pipe the other end of second electric capacity and the other end of fifth resistance all ground connection.
8. The Mini-L ED backlight source control system of claim 5, wherein the control unit comprises a first control chip, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first fuse, a second fuse and a light emitting diode;
one end of the seventh resistor is connected to the 1 st pin of the first control chip, one end of the eighth resistor is connected to the 2 nd pin of the first control chip, one end of the ninth resistor is connected to the 3 rd pin of the first control chip, one end of the tenth resistor is connected to the 4 th pin of the first control chip, one end of the eleventh resistor is connected to the 5 th pin of the first control chip, one end of the twelfth resistor is connected to the 6 th pin of the first control chip, one end of the thirteenth resistor is connected to the 8 th pin of the first control chip, one end of the fourteenth resistor is connected to the 9 th pin of the first control chip, and one end of the fifteenth resistor is connected to the 10 th pin of the first control chip; the other end of the seventh resistor, the other end of the eighth resistor, the other end of the ninth resistor, the other end of the tenth resistor, the other end of the eleventh resistor, the other end of the twelfth resistor, the other end of the thirteenth resistor, the other end of the fourteenth resistor and the other end of the fifteenth resistor are all connected with the mainboard; one end of the sixteenth resistor is connected with a pin 44 of the first control chip, the other end of the sixteenth resistor is connected with a BFB signal end, one end of the seventeenth resistor and one end of the third capacitor are connected with a pin 39 of the first control chip, the other end of the seventeenth resistor is connected with power, one end of the fourth capacitor is connected with a pin 38 of the first control chip, and the other end of the third capacitor and the other end of the fourth capacitor are both grounded; one end of the eighteenth resistor is connected with the 35 th pin of the first control chip, one end of the nineteenth resistor is connected with the 34 th pin of the first control chip, one end of the twentieth resistor is connected with the 33 th pin of the first control chip, one end of the twenty-first resistor is connected with the 32 th pin of the first control chip, one end of the twenty-second resistor is connected with the 31 th pin of the first control chip, and the other ends of the eighteenth resistor, the nineteenth resistor, the twentieth resistor, the twenty-first resistor and the twenty-second resistor are all connected with the scanning switching module; one end of the twenty-third resistor is connected with power, the other end of the twenty-third resistor and one end of the sixth capacitor are connected with the 24 th pin of the first control chip, the other end of the sixth capacitor and one end of the fifth capacitor are grounded, and the other end of the fifth capacitor and one end of the twentieth resistor are connected with the 23 th pin of the first control chip; the other end of the twenty-fourth resistor is grounded; a 46 th pin of the first control chip is grounded through the first protective tube, and a 45 th pin of the first control chip is connected with electricity through the second protective tube; the anode of the light emitting diode is connected with the power supply through the twenty-fifth resistor, and the cathode of the light emitting diode is connected with the 27 th pin of the first control chip.
9. The Mini-L ED backlight source control system of claim 5, wherein the first signal enhancement unit includes a second control chip, a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor, a twenty-ninth resistor, a thirty-third resistor, a thirty-fourth resistor, a thirty-fifth resistor, a thirty-sixth resistor, a thirty-seventh resistor, a thirty-eighth resistor, a thirty-ninth resistor, a forty-fourth resistor, a forty-first resistor, a forty-second resistor, a forty-third resistor, a forty-fourth resistor, a forty-fifth resistor, a forty-sixth resistor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor, an eighteenth capacitor, a nineteenth capacitor, a twentieth capacitor, a twenty-first capacitor, a twenty-second capacitor;
one end of the thirty-third resistor is connected with power, the other end of the thirty-third resistor, one end of the seventh capacitor, one end of the eighth capacitor and one end of the thirty-fifth resistor are all connected with the 1 st pin of the control chip, the other end of the thirty-fifth resistor and one end of the thirty-fourth resistor are all connected with the 2 nd pin of the second control chip, and the other end of the thirty-fourth resistor, the other end of the seventh capacitor and the other end of the eighth capacitor are all grounded; a pin 3 of the second control chip is connected to one end of the twenty-sixth resistor and one end of the ninth capacitor, a pin 4 is connected to one end of the twenty-seventh resistor and one end of the tenth capacitor, a pin 5 is connected to one end of the twenty-eighth resistor and one end of the eleventh capacitor, pins 6 and 7 are connected to one end of the twenty-ninth resistor and one end of the twelfth capacitor, a pin 8 is connected to one end of the thirty-third resistor and one end of the thirteenth capacitor, a pin 9 is connected to one end of the thirty-first resistor and one end of the fourteenth capacitor, and a pin 10 is connected to one end of the thirty-second resistor and one end of the fifteenth capacitor; the other end of the twenty-sixth resistor, the other end of the twenty-seventh resistor, the other end of the twenty-eighth resistor, the other end of the twenty-ninth resistor, the other end of the thirty-fifth resistor and the other end of the thirty-sixth resistor are all connected with the control unit; the 14 th pin of the second control chip is connected with one end of a sixteenth capacitor and an SPI signal output end through a forty-sixth resistor, the 15 th pin is connected with one end of a seventeenth capacitor and the SPI signal output end through a forty-fifth resistor, the 16 th pin is connected with one end of an eighteenth capacitor and the SPI signal output end through a forty-fourth resistor, the 17 th pin is connected with one end of a nineteenth capacitor and the SPI signal output end through a forty-third resistor, the 18 th pin is connected with one end of a twentieth capacitor and the SPI signal output end through a forty-second resistor, the 19 th pin is connected with one end of a twenty-first capacitor and the SPI signal output end through a forty-first resistor, the 20 th pin is connected with one end of a twenty-second capacitor and the SPI signal output end through a forty resistor, and the 21 st pin is connected with one end of a twenty-third capacitor and the SPI signal output end through a thirty-ninth resistor, a 22 th pin is connected with one end of the thirty-eighth resistor and one end of the thirty-sixth resistor, and a 23 th pin is connected with the other end of the thirty-sixth resistor, one end of the twenty-fourth capacitor, one end of the twenty-fifth capacitor and one end of the thirty-seventh resistor; the other end of the thirty-seventh resistor is grounded, and the other end of the thirty-eighth resistor, the other end of the twenty-fourth capacitor and the other end of the twenty-fifth capacitor are grounded.
10. A television set comprising a display screen and further comprising the Mini-L ED backlight source control system of claims 1-9.
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