CN103632629A - TV backlight drive control method and TV backlight drive control device - Google Patents
TV backlight drive control method and TV backlight drive control device Download PDFInfo
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Abstract
The invention discloses a TV backlight drive control method and a TV backlight drive control device. The TV backlight drive control method comprises the following steps: detecting a channel, matched with a light bar, of a constant-current chip for driving the light bar; controlling the detected channel, matched with the light bar, of the constant-current chip to be opened by means of a first reset current and carrying out PWM (Pulse-width Modulation) dimming at a preset working duty ratio value; and when the first preset current is not equal to a preset actual working current of the light bar, outputting a menu interface to allow debugging personnel to adjust the first preset current. According to the TV backlight drive control method and the TV backlight drive control device, different types of display screens can be driven just by using one drive circuit board, and thus the development cycle is shortened.
Description
Technical field
The present invention relates to display terminal field, particularly a kind of TV backlight drive control method and device.
Background technology
LED TV backlight drive is controlled and is mainly comprised power module, movement control module and constant current chip at present, and wherein power module is mainly movement control module and constant current chip power supply; Movement control module is controlled the standby of power module and enable signal and dim signal is provided to constant current plate, and to control constant current chip, to export constant current drives backlight.But because researching and developing, commissioning staff joining in the process of screen, need to join screen to dissimilar display screen processes, and the varying in size of drive current corresponding to dissimilar display screen, therefore when research and development, commissioning staff need to design separately a drive circuit board matching for each display screen, thereby increased the difficulty of research and development, extended the cycle of research and development.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of TV backlight drive control method, is intended to realize the driving to dissimilar display screen by a drive circuit board, shortens the cycle of research and development.
In order to realize goal of the invention, the invention provides a kind of TV backlight drive control method, described TV backlight drive control method comprises the following steps:
The passage that detection drives the constant current chip of lamp bar to mate with lamp bar;
Control detects the passage that constant current chip mates with lamp bar and opens with the first preset current, and carries out PWM light modulation with preset work dutyfactor value;
When described the first preset current is not equal to the preset real work electric current of lamp bar, output menu interface is adjusted described the first preset current for commissioning staff.
Preferably, described detection drives the constant current chip of lamp bar specifically to comprise with the passage that lamp bar mates:
Export the second preset current and preset light modulation dutyfactor value to described constant current chip, so that constant current chip to be set, drive the parameter of lamp bar;
Control constant current chip and turn on according to described the second preset current and preset light modulation dutyfactor value each channel presetting time that constant current chip drives lamp bar;
Detect each passage and whether have electric current, to judge whether the passage of constant current chip mates with lamp bar.
Preferably, carry out described output the second preset current and preset light modulation dutyfactor value to described constant current chip, so that constant current chip to be set, driving the parameter step of lamp bar also to comprise afterwards:
Output steering order, to described constant current chip, starts corresponding holding circuit to control constant current chip.
After the passage step of preferably, mating with lamp bar at the constant current chip of carrying out described detection driving lamp bar, also comprise:
Analyze the port number that constant current chip mates with lamp bar;
Judge whether described port number equals the first preset value;
If so, carry out described control and the passage that constant current chip mates with lamp bar detected and open with the first preset current, and carry out PWM light modulation step with preset work dutyfactor value;
If not, control and the passage that constant current chip mates with lamp bar detected and open with the 3rd preset current, and carry out PWM light modulation with preset work dutyfactor value;
Output menu interface is adjusted described the first preset current and the first preset value for commissioning staff, so that described, lower than preset current, equals the preset real work electric current of lamp bar, and the first preset value equals described port number.
Preferably, the passage that constant current chip mates with lamp bar detected and open with the 3rd preset current carrying out described control, and also comprise before with the step that preset work dutyfactor value carries out PWM light modulation:
Judge whether described port number is less than the first preset value;
If so, carry out described control and the passage that constant current chip mates with lamp bar detected and open with the 3rd preset current, and the step of carrying out PWM light modulation with preset work dutyfactor value;
If not, judge whether described port number is greater than the second preset value;
When described port number is less than or equal to the second preset value, controls and the passage that constant current chip mates with lamp bar to be detected and open with the 4th preset current, and carry out PWM light modulation with preset work dutyfactor value;
When described port number is greater than the second preset value, control described lamp bar in closed condition.
The present invention also provides a kind of TV backlight drive control device, and described TV backlight drive control device comprises:
Detection module, the passage mating with lamp bar for detection of the constant current chip that drives lamp bar;
Control module, detects the passage that constant current chip mates with lamp bar and opens with the first preset current for controlling, and carry out PWM light modulation with preset work dutyfactor value;
Output module, for when described the first preset current is not equal to the preset real work electric current of lamp bar, output menu interface is adjusted described the first preset current for commissioning staff.
Preferably, described detection module comprises:
Output unit, for exporting the second preset current and preset light modulation dutyfactor value to described constant current chip, drives the parameter of lamp bar so that constant current chip to be set;
Control module, turns on according to described the second preset current and preset light modulation dutyfactor value each channel presetting time that constant current chip drives lamp bar for controlling constant current chip;
Whether detecting unit, there is electric current for detection of each passage, to judge whether the passage of constant current chip mates with lamp bar.
Preferably, described output module also, for exporting steering order to described constant current chip, starts corresponding holding circuit to control constant current chip.
Preferably, TV backlight drive control device also comprises:
Analysis module, the port number mating with lamp bar for analyzing constant current chip;
The first judge module, for judging whether described port number equals the first preset value;
Described control module is specifically for when described port number equals the first preset value, controls the passage that constant current chip mates with lamp bar to be detected and open with the first preset current, and carries out PWM light modulation with preset work dutyfactor value; When described port number is not equal to the first preset value, controls and the passage that constant current chip mates with lamp bar detected and open with the 3rd preset current, and carry out PWM light modulation with preset work dutyfactor value;
Described output module is also adjusted described the first preset current and the first preset value for exporting menu interface for commissioning staff, so that described, lower than preset current, equals the preset real work electric current of lamp bar, and the first preset value equals described port number.
Preferably, described TV backlight drive control device also comprises:
The second judge module, for judging whether described port number is less than the first preset value;
The 3rd judge module, for judging whether described port number is greater than the second preset value;
Described control module is specifically for when described port number is less than the first preset value, controls the passage that constant current chip mates with lamp bar to be detected and open with the 3rd preset current, and carries out PWM light modulation with preset work dutyfactor value; When described port number is greater than the first preset value and is less than or equal to the second preset value, control and the passage that constant current chip mates with lamp bar to be detected and open with the 4th preset current, and carry out PWM light modulation with preset work dutyfactor value; When described port number is greater than the second preset value, control described lamp bar in closed condition.
After the passage that the present invention is mated with lamp bar by detection constant current chip, control detects the passage that constant current chip mates with lamp bar and opens with the first preset current, and carry out PWM light modulation with preset work dutyfactor value, thereby light display screen, and when the first preset current is not equal to the preset real work electric current of lamp bar, output menu interface is adjusted described the first preset current for commissioning staff, to guarantee display screen normal operation.Due to the present invention, can to realize the output current of constant current chip by software control mode adjustable, therefore can realize the driving to dissimilar display screen by a drive circuit board, thereby shorten the cycle of research and development.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of TV backlight drive control method of the present invention the first embodiment;
Fig. 2 is the schematic flow sheet of TV backlight drive control method of the present invention the second embodiment;
Fig. 3 is the schematic flow sheet of TV backlight drive control method of the present invention the 3rd embodiment;
Fig. 4 is the schematic flow sheet of TV backlight drive control method of the present invention the 4th embodiment;
Fig. 5 is the schematic flow sheet of TV backlight drive control method of the present invention the 5th embodiment;
Fig. 6 is the structural representation of TV backlight drive control device of the present invention one embodiment;
Fig. 7 is the structural representation of detection module in Fig. 6.
The realization of the object of the invention, functional characteristics and advantage, in connection with embodiment, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The invention provides a kind of TV backlight drive control method.
With reference to Fig. 1, Fig. 1 is the schematic flow sheet of TV backlight drive control method of the present invention the first embodiment.The TV backlight drive control method that the present embodiment provides comprises the following steps:
Step S10, the passage that detection drives the constant current chip of lamp bar to mate with lamp bar;
In the present embodiment, above-mentioned TV backlight drive control method is for driving disposal route backlight in commissioning staff's R&D process.Above-mentioned constant current chip is the lamp bar to backlight for output driving current, to control the unlatching of lamp bar or to close.Particularly, this constant current chip comprises many passages for being connected with lamp bar.When debugging, first a control chip can be set and can carry out with constant current chip the control chip of communication, by this control chip, detect the passage that constant current chip mates with lamp bar, control chip detects the passage being connected with lamp bar on constant current chip.It should be noted that the communication modes between above-mentioned control chip and constant current chip can arrange according to actual needs, carries out communication such as communication modes such as can adopting I2C or SPI.
Step S11, controls and the passage that constant current chip mates with lamp bar to be detected and open with the first preset current, and carry out PWM light modulation with preset work dutyfactor value;
Commissioning staff can be by program preset the first preset current and preset work dutyfactor value in control chip, then by communication modes such as I2C or SPI, export constant current chip to, the passage mating with lamp bar with control constant current chip is opened with the first preset current, and carry out PWM light modulation with preset work dutyfactor value, thereby light display screen.In the present embodiment, the large I of the size of above-mentioned the first preset current and preset work dutyfactor value arranges according to actual needs, at this, does not limit further.
Step S12, when described the first preset current is not equal to the preset real work electric current of lamp bar, output menu interface is adjusted described the first preset current for commissioning staff.
After lighting display screen, to judge whether above-mentioned the first preset current equals the electric current of the preset real work of lamp bar, when the first preset current is not equal to the preset real work electric current of lamp bar, by export a menu interface by display screen, for commissioning staff, adjust the size of the first preset current, thereby guarantee display screen normal operation.
After the passage that the present invention is mated with lamp bar by detection constant current chip, control detects the passage that constant current chip mates with lamp bar and opens with the first preset current, and carry out PWM light modulation with preset work dutyfactor value, thereby light display screen, and when the first preset current is not equal to the preset real work electric current of lamp bar, output menu interface is adjusted described the first preset current for commissioning staff, to guarantee display screen normal operation.Due to the present invention, can to realize the output current of constant current chip by software control mode adjustable, therefore can realize the driving to dissimilar display screen by a drive circuit board, thereby shorten the cycle of research and development.
Particularly, with reference to Fig. 2, Fig. 2 is the schematic flow sheet of TV backlight drive control method of the present invention the second embodiment.Based on above-described embodiment, in the present embodiment, above-mentioned steps S10 specifically comprises:
Step S101, exports the second preset current and preset light modulation dutyfactor value to described constant current chip, drives the parameter of lamp bar so that constant current chip to be set;
Step S102, controls constant current chip and turns on according to described the second preset current and preset light modulation dutyfactor value each channel presetting time that constant current chip drives lamp bar;
Step S103, detects each passage and whether has electric current, to judge whether the passage of constant current chip mates with lamp bar.
In the present embodiment, can export above-mentioned the second preset current and preset light modulation dutyfactor value to described constant current chip by above-mentioned control chip, thereby the parameter that constant current chip drives lamp bar is set; And then output enable signal to constant current chip by control chip, make constant current chip normal operation, and drive the work of lamp bar.Should explanatorily, this time drive operation only for checking that whether the passage of constant current chip mates with lamp bar, so the time is shorter, does not need to light display screen.When constant current chip receives enable signal, all passages of constant current chip will be opened with the PWM dim signal of above-mentioned the second preset current and preset light modulation dutyfactor value.While now there is electric current on control chip detects a certain passage of constant current chip, represent that this passage is normally connected with lamp bar, this passage matches with lamp bar.
Further, with reference to Fig. 3, Fig. 3 is the schematic flow sheet of TV backlight drive control method of the present invention the 3rd embodiment.Based on above-described embodiment, in the present embodiment, after carrying out above-mentioned steps S101, also comprise:
Step S104, output steering order, to described constant current chip, starts corresponding holding circuit to control constant current chip.
In the present embodiment, commissioning staff can start the holding circuit external with constant current chip according to actual needs, to realize the defencive function to lamp bar.Particularly, this defencive function comprises current protection, voltage protection and overheating protection.When debugging; the instruction that can need to open defencive function by the mode of program by commissioning staff inputs to control chip; by control chip, by communication modes such as I2C or SPI, export steering order to constant current chip; constant current chip starts corresponding holding circuit according to the steering order receiving, to realize corresponding defencive function.
Further, with reference to Fig. 4, Fig. 4 is the schematic flow sheet of TV backlight drive control method of the present invention the 4th embodiment.Based on above-described embodiment, in the present embodiment, after carrying out described step S10, also comprise:
Step S13, analyzes the port number that constant current chip mates with lamp bar;
Step S14, judges whether described port number equals the first preset value; If perform step S11, perform step if not S15;
Step S15, controls and the passage that constant current chip mates with lamp bar to be detected and open with the 3rd preset current, and carry out PWM light modulation with preset work dutyfactor value;
Step S16, output menu interface is adjusted described the first preset current and the first preset value for commissioning staff, so that described, lower than preset current, equals the preset real work electric current of lamp bar, and the first preset value equals described port number.
In the present embodiment, above-mentioned control chip has detected after the passage that constant current chip mates with lamp bar, analyze the port number that constant current chip mates with lamp bar, when port number equals the first preset value, directly control and the passage that constant current chip mates with lamp bar detected and open with the 3rd preset current, and carry out PWM light modulation with preset work dutyfactor value, thereby directly light backlight.When port number is not equal to the first preset value, control and the passage that constant current chip mates with lamp bar detected and open with the 3rd preset current, and carry out PWM light modulation with preset work dutyfactor value, thereby tentatively light backlightly, then on display screen, the size of the first preset current and the size of the first preset value are adjusted for commissioning staff in output function interface.Thereby when the display screen of the type is connected with constant current chip, after can be directly being adjusted by control chip output lower than preset current value, make display screen normal operation.The present embodiment can directly be adjusted the program of control chip for commissioning staff by display screen display menu interface, thereby without again the program in control chip being carried out to burning by computer, therefore can reduce debugging difficulty, has shortened the R&D cycle.It should be noted that above-mentioned the first preset value is the port number of all passages of constant current chip.
Further, with reference to Fig. 5, Fig. 5 is the schematic flow sheet of TV backlight drive control method of the present invention the 5th embodiment.Based on above-described embodiment, in the present embodiment, before carrying out above-mentioned steps S15, also comprise:
Step S17, judges whether described port number is less than the first preset value; If perform step S15, perform step if not S18;
Step S18, judges whether described port number is greater than the second preset value; If perform step S19, perform step if not S20.
Step S19, controls described lamp bar in closed condition;
Step S20, controls and the passage that constant current chip mates with lamp bar to be detected and open with the 4th preset current, and carry out PWM light modulation with preset work dutyfactor value.
Based on above-described embodiment, the largest passages number that in the present embodiment, above-mentioned the second prevalue is display screen, when control chip detects the largest passages number that port number that constant current chip mates with lamp bar is greater than display screen, represent this time to detect for abnormality detection, now, for fear of damaging display screen, can directly export steering order and control lamp bar in closed condition.
The present invention also provides a kind of TV backlight drive control device, for realizing said method.With reference to Fig. 6, Fig. 6 is the structural representation of TV backlight drive control device of the present invention one embodiment.The TV backlight drive control device that the present embodiment provides comprises:
In the present embodiment, above-mentioned TV backlight drive control method is for driving disposal route backlight in commissioning staff's R&D process.Above-mentioned constant current chip is the lamp bar to backlight for output driving current, to control the unlatching of lamp bar or to close.Particularly, this constant current chip comprises many passages for being connected with lamp bar.In when debugging, first a control chip can be set and can carry out with constant current chip the control chip of communication, by the detection module 100 of this control chip, detect the passage that constant current chips mate with lamp bar, the passage being connected with lamp bar on detection module 100 detection constant current chips.It should be noted that the communication modes between above-mentioned control chip and constant current chip can arrange according to actual needs, carries out communication such as communication modes such as can adopting I2C or SPI.
Commissioning staff can be by program preset the first preset current and preset work dutyfactor value in control chip, then by communication modes such as I2C or SPI, export constant current chip to, the passage mating with lamp bar with control constant current chip is opened with the first preset current, and carry out PWM light modulation with preset work dutyfactor value, thereby light display screen.In the present embodiment, the large I of the size of above-mentioned the first preset current and preset work dutyfactor value arranges according to actual needs, at this, does not limit further.
After lighting display screen, to judge whether above-mentioned the first preset current equals the electric current of the preset real work of lamp bar, when the first preset current is not equal to the preset real work electric current of lamp bar, output module 300 is adjusted the size of the first preset current by export a menu interface by display screen for commissioning staff, thereby guarantees display screen normal operation.
After the passage that the present invention is mated with lamp bar by detection module 100 detection constant current chips, by control module 200, control and the passage that constant current chip mates with lamp bar detected and open with the first preset current, and carry out PWM light modulation with preset work dutyfactor value, thereby light display screen, and when the first preset current is not equal to the preset real work electric current of lamp bar, by output module 300 output menu interfaces, for commissioning staff, adjust described the first preset current, to guarantee display screen normal operation.Due to the present invention, can to realize the output current of constant current chip by software control mode adjustable, therefore can realize the driving to dissimilar display screen by a drive circuit board, thereby shorten the cycle of research and development.
Particularly, in conjunction with reference to Fig. 7, Fig. 7 is the structural representation of detection module in Fig. 6.Based on above-described embodiment, in the present embodiment, above-mentioned detection module 100 comprises:
Whether detecting unit 103, there is electric current for detection of each passage, to judge whether the passage of constant current chip mates with lamp bar.
In the present embodiment, output unit 101 above-mentioned the second preset current of output that can be by above-mentioned control chip and preset light modulation dutyfactor value be to described constant current chip, thereby the parameter that constant current chip drives lamp bar is set; And then output enable signal to constant current chip by the control module 102 of control chip, make constant current chip normal operation, and drive the work of lamp bar.Should explanatorily, this time drive operation only for checking that whether the passage of constant current chip mates with lamp bar, so the time is shorter, does not need to light display screen.When constant current chip receives enable signal, all passages of constant current chip will be opened with the PWM dim signal of above-mentioned the second preset current and preset light modulation dutyfactor value.While now there is electric current on detecting unit 103 detects a certain passage of constant current chip, represent that this passage is normally connected with lamp bar, this passage matches with lamp bar.
Further, based on above-described embodiment, in the present embodiment, above-mentioned output module 300 also, for exporting steering order to described constant current chip, starts corresponding holding circuit to control constant current chip.
In the present embodiment, commissioning staff can start the holding circuit external with constant current chip according to actual needs, to realize the defencive function to lamp bar.Particularly, this defencive function comprises current protection, voltage protection and overheating protection.When debugging; the instruction that can need to open defencive function by the mode of program by commissioning staff inputs to control chip; output module 300 by control chip is exported steering order to constant current chip by communication modes such as I2C or SPI; constant current chip starts corresponding holding circuit according to the steering order receiving, to realize corresponding defencive function.
Further, based on above-described embodiment, in the present embodiment, above-mentioned TV backlight drive control device also comprises:
The first judge module 500, for judging whether described port number equals the first preset value;
Described control module 200 is specifically for when described port number equals the first preset value, controls the passage that constant current chip mates with lamp bar to be detected and open with the first preset current, and carries out PWM light modulation with preset work dutyfactor value; When described port number is not equal to the first preset value, controls and the passage that constant current chip mates with lamp bar detected and open with the 3rd preset current, and carry out PWM light modulation with preset work dutyfactor value;
Described output module 300 is also adjusted described the first preset current and the first preset value for exporting menu interface for commissioning staff, so that described, lower than preset current, equals the preset real work electric current of lamp bar, and the first preset value equals described port number.
In the present embodiment, above-mentioned control chip has detected after the passage that constant current chip mates with lamp bar, by analysis module 400, analyze the port number that constant current chip mates with lamp bar, when port number equals the first preset value, directly control and the passage that constant current chip mates with lamp bar detected and open with the 3rd preset current, and carry out PWM light modulation with preset work dutyfactor value, thereby directly light backlight.When port number is not equal to the first preset value, control and the passage that constant current chip mates with lamp bar detected and open with the 3rd preset current, and carry out PWM light modulation with preset work dutyfactor value, thereby tentatively light backlightly, then on display screen, the size of the first preset current and the size of the first preset value are adjusted for commissioning staff in output function interface.Thereby when the display screen of the type is connected with constant current chip, after can be directly being adjusted by control chip output lower than preset current value, make display screen normal operation.The present embodiment can directly be adjusted the program of control chip for commissioning staff by display screen display menu interface, thereby without again the program in control chip being carried out to burning by computer, therefore can reduce debugging difficulty, has shortened the R&D cycle.It should be noted that above-mentioned the first preset value is the port number of all passages of constant current chip.
Further, based on above-described embodiment, in the present embodiment, above-mentioned TV backlight drive control device also comprises:
The second judge module 600, for judging whether described port number is less than the first preset value;
The 3rd judge module 700, for judging whether described port number is greater than the second preset value;
Described control module 200 is specifically for when described port number is less than the first preset value, controls the passage that constant current chip mates with lamp bar to be detected and open with the 3rd preset current, and carries out PWM light modulation with preset work dutyfactor value; When described port number is greater than the first preset value and is less than or equal to the second preset value, control and the passage that constant current chip mates with lamp bar to be detected and open with the 4th preset current, and carry out PWM light modulation with preset work dutyfactor value; When described port number is greater than the second preset value, control described lamp bar in closed condition.
Based on above-described embodiment, the largest passages number that in the present embodiment, above-mentioned the second prevalue is display screen, when control chip detects the largest passages number that port number that constant current chip mates with lamp bar is greater than display screen, represent this time to detect for abnormality detection, now, for fear of damaging display screen, can directly export steering order and control lamp bar in closed condition.
These are only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes instructions of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a TV backlight drive control method, is characterized in that, comprises the following steps:
The passage that detection drives the constant current chip of lamp bar to mate with lamp bar;
Control detects the passage that constant current chip mates with lamp bar and opens with the first preset current, and carries out PWM light modulation with preset work dutyfactor value;
When described the first preset current is not equal to the preset real work electric current of lamp bar, output menu interface is adjusted described the first preset current for commissioning staff.
2. TV backlight drive control method as claimed in claim 1, is characterized in that, described detection drives the constant current chip of lamp bar specifically to comprise with the passage that lamp bar mates:
Export the second preset current and preset light modulation dutyfactor value to described constant current chip, so that constant current chip to be set, drive the parameter of lamp bar;
Control constant current chip and turn on according to described the second preset current and preset light modulation dutyfactor value each channel presetting time that constant current chip drives lamp bar;
Detect each passage and whether have electric current, to judge whether the passage of constant current chip mates with lamp bar.
3. TV backlight drive control method as claimed in claim 2, is characterized in that, is carrying out described output the second preset current and preset light modulation dutyfactor value to described constant current chip, so that constant current chip to be set, drives the parameter step of lamp bar also to comprise afterwards:
Output steering order, to described constant current chip, starts corresponding holding circuit to control constant current chip.
4. TV backlight drive control method as claimed in claim 1, is characterized in that, after the passage step of mating with lamp bar at the constant current chip of carrying out described detection driving lamp bar, also comprises:
Analyze the port number that constant current chip mates with lamp bar;
Judge whether described port number equals the first preset value;
If so, carry out described control and the passage that constant current chip mates with lamp bar detected and open with the first preset current, and carry out PWM light modulation step with preset work dutyfactor value;
If not, control and the passage that constant current chip mates with lamp bar detected and open with the 3rd preset current, and carry out PWM light modulation with preset work dutyfactor value;
Output menu interface is adjusted described the first preset current and the first preset value for commissioning staff, so that described, lower than preset current, equals the preset real work electric current of lamp bar, and the first preset value equals described port number.
5. TV backlight drive control method as claimed in claim 4, it is characterized in that, the passage that constant current chip mates with lamp bar detected and open with the 3rd preset current carrying out described control, and also comprise before with the step that preset work dutyfactor value carries out PWM light modulation:
Judge whether described port number is less than the first preset value;
If so, carry out described control and the passage that constant current chip mates with lamp bar detected and open with the 3rd preset current, and the step of carrying out PWM light modulation with preset work dutyfactor value;
If not, judge whether described port number is greater than the second preset value;
When described port number is less than or equal to the second preset value, controls and the passage that constant current chip mates with lamp bar to be detected and open with the 4th preset current, and carry out PWM light modulation with preset work dutyfactor value;
When described port number is greater than the second preset value, control described lamp bar in closed condition.
6. a TV backlight drive control device, is characterized in that, comprising:
Detection module, the passage mating with lamp bar for detection of the constant current chip that drives lamp bar;
Control module, detects the passage that constant current chip mates with lamp bar and opens with the first preset current for controlling, and carry out PWM light modulation with preset work dutyfactor value;
Output module, for when described the first preset current is not equal to the preset real work electric current of lamp bar, output menu interface is adjusted described the first preset current for commissioning staff.
7. TV backlight drive control device as claimed in claim 6, is characterized in that, described detection module comprises:
Output unit, for exporting the second preset current and preset light modulation dutyfactor value to described constant current chip, drives the parameter of lamp bar so that constant current chip to be set;
Control module, turns on according to described the second preset current and preset light modulation dutyfactor value each channel presetting time that constant current chip drives lamp bar for controlling constant current chip;
Whether detecting unit, there is electric current for detection of each passage, to judge whether the passage of constant current chip mates with lamp bar.
8. TV backlight drive control device as claimed in claim 7, is characterized in that, described output module also, for exporting steering order to described constant current chip, starts corresponding holding circuit to control constant current chip.
9. TV backlight drive control device as claimed in claim 6, is characterized in that, TV backlight drive control device also comprises:
Analysis module, the port number mating with lamp bar for analyzing constant current chip;
The first judge module, for judging whether described port number equals the first preset value;
Described control module is specifically for when described port number equals the first preset value, controls the passage that constant current chip mates with lamp bar to be detected and open with the first preset current, and carries out PWM light modulation with preset work dutyfactor value; When described port number is not equal to the first preset value, controls and the passage that constant current chip mates with lamp bar detected and open with the 3rd preset current, and carry out PWM light modulation with preset work dutyfactor value;
Described output module is also adjusted described the first preset current and the first preset value for exporting menu interface for commissioning staff, so that described, lower than preset current, equals the preset real work electric current of lamp bar, and the first preset value equals described port number.
10. TV backlight drive control device as claimed in claim 9, is characterized in that, described TV backlight drive control device also comprises:
The second judge module, for judging whether described port number is less than the first preset value;
The 3rd judge module, for judging whether described port number is greater than the second preset value;
Described control module is specifically for when described port number is less than the first preset value, controls the passage that constant current chip mates with lamp bar to be detected and open with the 3rd preset current, and carries out PWM light modulation with preset work dutyfactor value; When described port number is greater than the first preset value and is less than or equal to the second preset value, control and the passage that constant current chip mates with lamp bar to be detected and open with the 4th preset current, and carry out PWM light modulation with preset work dutyfactor value; When described port number is greater than the second preset value, control described lamp bar in closed condition.
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| CN103632629B (en) | 2016-04-13 |
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