CN203788378U - LED hybrid light modulation circuit and television set - Google Patents
LED hybrid light modulation circuit and television set Download PDFInfo
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- CN203788378U CN203788378U CN201320772886.2U CN201320772886U CN203788378U CN 203788378 U CN203788378 U CN 203788378U CN 201320772886 U CN201320772886 U CN 201320772886U CN 203788378 U CN203788378 U CN 203788378U
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Abstract
The utility model discloses an LED hybrid light modulation circuit and a television set with the circuit. The LED hybrid light modulation circuit comprises a master control chip, a PWM light modulation unit, a DC light modulation unit, and a light modulation driving chip. The first output end of the master control chip is connected with the input end of the PWM light modulation unit and the input end of the DC light modulation unit. The second output end of the master control chip is connected with the backlight brightness command input end of the light modulation driving chip. The output end of the PWM light modulation unit is connected with the second PWM signal input end of the light modulation driving chip. The output end of the DC light modulation unit is connected with the DC voltage signal input end of the light modulation driving chip. When an LED is in a high television backlight brightness section, the light modulation driving chip uses a DC light modulation method, so as to improve luminous efficiency of the LED. When the LED is in a low television backlight brightness section, the light modulation driving chip uses a PWM light modulation method, so as to ensure image quality.
Description
Technical field
The utility model relates to field of television, particularly relates to a kind of LED mixing light adjusting circuit and television set.
Background technology
At present, LED(Light Emitting Diode, light-emitting diode) liquid crystal TV set backlight all adopts interchange---PWM (variable duty ratio) dimming mode: keep constant by the On current of LED lamp, change the duty ratio of PWM ripple, thereby change, flow through LED lamp current effective value, and then reach the object of adjusting backlight illumination.PWM dimming mode has advantages of that principle is simple, simple in circuits, tuning linearity is good and colour temperature is stable, thereby is generally adopted on LED liquid crystal TV set.But PWM dimming mode luminous efficiency is not high.
In addition, the direct current dimming mode that LED-backlit LCD TV adopts: LED lamp, in Chang Liang, normally on, obtains different brightness by changing the size of current of LED lamp.This mode has reduced On current, has improved luminous efficiency.But at electric current hour, the colour temperature of LED lamp is with curent change large (producing considerable influence to image quality) for this kind of dimming mode.
Utility model content
The utility model provides a kind of LED mixing light adjusting circuit, the luminous efficiency that is intended to guarantee the image quality of image and improves LED.
To achieve these goals, the utility model provides a kind of LED mixing light adjusting circuit, for the LED of television set is carried out to backlight illumination adjusting, this LED mixing light adjusting circuit comprises Master control chip, PWM light modulation unit, direct current light modulation unit and light modulation drive chip, wherein, described Master control chip is connected with described PWM light modulation unit, described Master control chip is connected with described direct current light modulation unit, described Master control chip also drives chip to be connected with described light modulation, described PWM light modulation unit drives chip to be connected with described light modulation, described direct current light modulation unit drives chip to be connected with described light modulation,
The backlight illumination instruction that described Master control chip is set according to user produces the first pwm signal, and exports respectively described the first pwm signal to described PWM light modulation unit and direct current light modulation unit; The backlight illumination instruction that described Master control chip is also set user exports described light modulation to and drives chip;
Described PWM light modulation unit receives the first pwm signal of described Master control chip output and described the first pwm signal is processed, and processes and obtains the second pwm signal and export this second pwm signal to described light modulation driving chip;
Described direct current light modulation unit, receives the first pwm signal of described Master control chip output and described the first pwm signal is carried out to pressure regulation processing, and pressure regulation is processed and obtained d. c. voltage signal and export this d. c. voltage signal to light modulation driving chip;
The backlight illumination instruction that the user that described light modulation drives chip to receive the second pwm signal of described PWM light modulation unit output, the d. c. voltage signal of described direct current light modulation unit output and the output of described Master control chip sets; When the backlight illumination of described user's setting is less than preset value, described light modulation drives chip, according to the second pwm signal, described LED is carried out to PWM light modulation, when the backlight illumination of described user's setting is more than or equal to described preset value, described light modulation drives chip, according to d. c. voltage signal, described LED is carried out to direct current light modulation.
Preferably, described Master control chip comprises the first output, described the first output is connected with described PWM light modulation unit, described PWM light modulation unit comprises the first energy-storage units, the first partial pressure unit, the first resistance, the second resistance, the first triode and the second triode, the input of described the first energy-storage units is connected with the first output of described Master control chip, and the output of described the first energy-storage units is connected with the base stage of the first triode through the first resistance; The input of described the first partial pressure unit is connected with external dc power, and output is connected with the base stage of described the first triode through described the first resistance; The collector electrode of described the first triode is connected with described external dc power, grounded emitter; The collector electrode of described the first triode is connected with the base stage of described the second triode through described the second resistance, the grounded emitter of described the second triode, the collector electrode of described the second triode is connected with described external dc power and as the output of described PWM light modulation unit.
Preferably, described the first energy-storage units comprises the 3rd resistance and the first electric capacity, described the 3rd resistance one end is connected with the first output of described Master control chip, the other end of described the 3rd resistance is through the first capacity earth, and described the 3rd resistance is connected with the base stage of described the first triode through described the first resistance with the node between the first electric capacity.
Preferably, described the first partial pressure unit comprises the 4th resistance and the 5th resistance, one end of described the 4th resistance is connected with described external dc power, the other end of described the 4th resistance is through the 5th grounding through resistance, and described the 4th resistance is connected with the base stage of described the first triode through described the first resistance with the node between described the 5th resistance.
Preferably, described Master control chip comprises the first output, described the first output is connected with described direct current light modulation unit, and described direct current light modulation unit comprises the second energy-storage units, the 3rd energy-storage units, the second partial pressure unit, the 3rd partial pressure unit and the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance and the 3rd triode, the 4th triode, the 5th triode; The input of described the second energy-storage units is connected with the first output of described Master control chip, and output is connected with the base stage of described the 3rd triode through the second partial pressure unit; The collector electrode of described the 3rd triode is connected with the base stage of the 4th triode through the 6th resistance, and the emitter of described the 3rd triode is connected with external dc power through the 7th resistance, and the emitter of described the 3rd triode is through described the 8th grounding through resistance; The collector electrode of described the 4th triode is connected with described external dc power through the 9th resistance, grounded emitter; The base stage of the 5th triode is connected with the collector electrode of described the 4th triode, collector electrode is connected with the output of described the second energy-storage units, emitter is connected with the output of described the 3rd partial pressure unit through the 3rd energy-storage units, the input of described the 3rd partial pressure unit is connected with described external dc power, and the output of described the 3rd partial pressure unit is as the output of described direct current light modulation unit.
Preferably, described the second energy-storage units comprises the tenth resistance and the second electric capacity, one end of described the tenth resistance is connected with the first output of described Master control chip, the other end of described the tenth resistance is through the second capacity earth, and described the tenth resistance is connected with described the second partial pressure unit with the node between described the second electric capacity.
Preferably, described the 3rd energy-storage units comprises the 11 resistance and the 3rd electric capacity, one end of described the 11 resistance is connected with the emitter of described the 5th triode, the other end of described the 11 resistance is through the 3rd capacity earth, and described the 11 resistance is connected with the output of described the 3rd partial pressure unit with the node between described the 3rd electric capacity.
Preferably, described the second partial pressure unit comprises the 12 resistance and the 13 resistance, one end of described the 12 resistance is connected with the output of described the second energy-storage units, the other end of described the 12 resistance is through the 13 grounding through resistance, and the 12 resistance is connected with the base stage of described the 3rd triode with the node between the 13 resistance.
Preferably, described the 3rd partial pressure unit comprises the 14 resistance and the 15 resistance, one end of described the 14 resistance is connected with described external dc power, the other end of described the 14 resistance is through the 15 grounding through resistance, and the node between described the 14 resistance and described the 15 resistance is as the output of direct current light modulation unit.
The utility model provides a kind of television set, this television set has LED mixing light adjusting circuit, this LED mixing light adjusting circuit is for carrying out backlight illumination adjusting to the LED of television set, this LED mixing light adjusting circuit comprises Master control chip, PWM light modulation unit, direct current light modulation unit and light modulation drive chip, wherein, described Master control chip is connected with described PWM light modulation unit, described Master control chip is connected with described direct current light modulation unit, described Master control chip also drives chip to be connected with described light modulation, described PWM light modulation unit drives chip to be connected with described light modulation, described direct current light modulation unit drives chip to be connected with described light modulation,
The backlight illumination instruction that described Master control chip is set according to user produces the first pwm signal, and exports respectively described the first pwm signal to described PWM light modulation unit and direct current light modulation unit; The backlight illumination instruction that described Master control chip is also set user exports described light modulation to and drives chip;
Described PWM light modulation unit receives the first pwm signal of described Master control chip output and described the first pwm signal is processed, and processes and obtains the second pwm signal and export this second pwm signal to described light modulation driving chip;
Described direct current light modulation unit, receives the first pwm signal of described Master control chip output and described the first pwm signal is carried out to pressure regulation processing, and pressure regulation is processed and obtained d. c. voltage signal and export this d. c. voltage signal to light modulation driving chip;
The backlight illumination instruction that the user that described light modulation drives chip to receive the second pwm signal of described PWM light modulation unit output, the d. c. voltage signal of described direct current light modulation unit output and the output of described Master control chip sets; When the backlight illumination of described user's setting is less than preset value, described light modulation drives chip, according to the second pwm signal, described LED is carried out to PWM light modulation, when the backlight illumination of described user's setting is more than or equal to described preset value, described light modulation drives chip, according to d. c. voltage signal, described LED is carried out to direct current light modulation.
The utility model is set up a PWM light modulation unit and direct current light modulation unit, and when LED is low when interval in TV backlight illumination, the duty of the first pwm signal of Master control chip output is smaller.Light modulation drives chip to adopt PWM light modulation, and the ON time of LED is just along with the second pwm signal respective change because frequency ratio is higher, human eye perceives to be exactly the variation of brightness, make in the situation that LED-backlit brightness is lower, image quality is normal.When LED is when TV backlight illumination height is interval, the duty ratio of the first pwm signal of Master control chip output is larger, and light modulation drives chip to adopt direct current light modulation.Adopt direct current dimming mode, LED Chang Liang, regulates the electric current that flows through LED to carry out brightness adjusting.Flow through LED electric current and change according to the requirement of brightness, this electric current PWM light modulation On current 43% to 100% between change.This kind of dimming mode reduced the loss of electric current, improved the luminous efficiency of LED.
Accompanying drawing explanation
Fig. 1 is the module diagram of the utility model LED mixing light adjusting circuit;
Fig. 2 is the structural representation of the utility model LED mixing light adjusting circuit one embodiment.
The realization of the utility model object, 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 is only in order to explain the utility model, and be not used in restriction the utility model.
With reference to Fig. 1 and 2, Fig. 1 is the module diagram of the utility model LED mixing light adjusting circuit; Fig. 2 is the structural representation of the utility model LED mixing light adjusting circuit one embodiment.A kind of LED mixing light adjusting circuit that the present embodiment provides, comprises that Master control chip U1, PWM light modulation unit 1, direct current light modulation unit 2 and light modulation drive chip U2.
Wherein, Master control chip U1 comprises the first output and the second output, and light modulation drives chip U2 to comprise the second pwm signal input, d. c. voltage signal input and backlight illumination instruction input.
The first output of Master control chip U1 is all connected with the input of PWM light modulation unit 1, the input of direct current light modulation unit 2.The second output of Master control chip U1 drives the backlight illumination instruction input of chip U2 to be connected with light modulation.The output of PWM light modulation unit 1 drives the second pwm signal input of chip U2 to be connected with light modulation, and the output of direct current light modulation unit 2 drives the d. c. voltage signal input of chip U2 to be connected with light modulation.
The backlight illumination instruction that Master control chip U1 sets by receiving the user of the transmissions such as remote controller conventionally, when the backlight illumination of user's setting is less than preset value, is defined as the low interval of backlight illumination.When the backlight illumination of user's setting is more than or equal to preset value, be defined as backlight illumination high interval.This preset value can be set according to actual conditions, and this preset value is preferably set to 40.Master control chip U1 produces the first pwm signal of different duty according to the different backlight illumination interval of LED, and exports the first pwm signal at the first output.When user is set as the high interval of backlight illumination, the first larger pwm signal of the first output output duty cycle of Master control chip U1.When user is set as the low interval of backlight illumination, the first less pwm signal of the first output output duty cycle of Master control chip U1.The backlight illumination instruction that the second output output user of Master control chip U1 sets.
PWM light modulation unit 1 receives the first pwm signal of Master control chip U1 output, and exports the second pwm signal at the output of PWM light modulation unit 1.Particularly, PWM light modulation unit 1 comprises the first energy-storage units 11, the first partial pressure unit 12, the first resistance R 1, the second resistance R 2, the first triode Q1 and the second triode Q2, the input of the first energy-storage units 11 is connected with the first output of Master control chip U1, and the output of the first energy-storage units 11 is connected with the base stage of the first triode Q1 through the first resistance R 1.The input of the first partial pressure unit 12 is connected with external dc power VCC, and output is connected with the base stage of the first triode Q1 through the first resistance R 1; The collector electrode of the first triode Q1 is connected with external dc power VCC, grounded emitter; The collector electrode of the first triode Q1 is connected with the base stage of the second triode Q2 through the second resistance R 2, the grounded emitter of the second triode Q2, and the collector electrode of the second triode Q2 is connected with external dc power VCC and as the output of PWM light modulation unit 1.
Direct current light modulation unit 2 receives the first pwm signal of Master control chip U1 output, and at the output output dc voltage signal of direct current light modulation unit 2.Particularly, direct current light modulation unit 2 comprises the second energy-storage units 21, the 3rd energy-storage units 22, the second partial pressure unit 23, the 3rd partial pressure unit 24 and the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9 and the 3rd triode Q3, the 4th triode Q4, the 5th triode Q5.The input of the second energy-storage units 21 is connected with the first output of Master control chip U1, and output is connected with the base stage of the 3rd triode Q3 through the second partial pressure unit 23.The collector electrode of the 3rd triode Q3 is connected with the base stage of the 4th triode Q4 through the 6th resistance R 6, and emitter is connected with external dc power VCC through the 7th resistance R 7, and this emitter is also through the 8th resistance R 8 ground connection.The collector electrode of the 4th triode Q4 is connected with external dc power VCC through the 9th resistance R 9, grounded emitter.The base stage of the 5th triode Q5 is connected with the collector electrode of the 4th triode Q4, collector electrode is connected with the output of the second energy-storage units 21, emitter is connected with the output of the 3rd partial pressure unit 24 through the 3rd energy-storage units 22, the input of the 3rd partial pressure unit 24 is connected with external dc power VCC, and the output of the 3rd partial pressure unit 24 is as the output of direct current light modulation unit 2.
Light modulation drives the second pwm signal input of chip U2 to receive the second pwm signal of PWM light modulation unit 1 output, d. c. voltage signal input receives the d. c. voltage signal of direct current light modulation unit 2 outputs, and backlight illumination instruction input receives the backlight illumination instruction of user's setting of Master control chip U1 output.When backlight illumination is low interval, light modulation drives chip U2 to utilize the second pwm signal to carry out PWM light modulation to LED.When backlight illumination is high interval, light modulation drives chip U2 to utilize d. c. voltage signal to carry out direct current light modulation to LED.
The operation principle of LED mixing light adjusting circuit:
When user sets LED in the low interval of backlight illumination, the duty of the first pwm signal of Master control chip U1 output is smaller.The first energy-storage units 11 in PWM light modulation unit 1 is with the continuous charging and discharging of the first pwm signal.When the voltage of the first energy-storage units 11 is higher, the first triode Q1 conducting, the second triode Q2 turn-offs, PWM light modulation unit 1 output high level.When the first energy-storage units 11 is when voltage is lower, the first triode Q1 turn-offs, the second triode Q2 conducting, PWM light modulation unit 1 output low level.Like this, PWM light adjusting circuit 1 is with regard to the second pwm signal of output and the first pwm signal same frequency.Direct current light modulation unit 2 is because the second energy-storage units 21 time constants are large, therefore the voltage of the second energy-storage units 21 is always lower, the 3rd triode Q3 conducting, the 4th triode Q4 conducting, and the 5th triode Q5 turn-offs, making a direct voltage that voltage is lower of direct current light modulation unit 2 outputs, is the direct voltage that magnitude of voltage is lower thereby make the d. c. voltage signal of direct current light modulation unit 2 outputs.
When user sets LED, be backlight illumination when high interval, the duty ratio of the first pwm signal of Master control chip U1 output is larger.The first 11 charging intervals of energy-storage units in PWM light adjusting circuit are longer, and charging voltage is higher and be in high level state always, the first triode Q1 conducting, and the second triode Q2 turn-offs, the direct voltage of PWM light modulation unit 1 stable output.And in direct current light modulation unit 2, the second energy-storage units 21 is charging and discharging constantly.When the second energy-storage units 21 voltages are when higher, the 3rd triode Q3 turn-offs, and the 4th triode Q4 turn-offs, the 5th triode Q5 conducting, and the second energy-storage units 21 is given the 3rd energy-storage units 22 chargings.When the second energy-storage units 21 voltages are when lower, the 3rd triode Q3 conducting, the 4th triode Q4 conducting, the 5th triode Q5 turn-offs, and the second energy-storage units 21 stops to the 3rd energy-storage units 22 chargings.Like this, the second energy-storage units 21 gives the charge frequency of the 3rd energy-storage units 22 just identical with the first pwm signal frequency, and the duty ratio of the first pwm signal is larger, and each charging interval is longer, thereby makes the direct voltage of direct current light modulation unit 2 outputs also larger.
The utility model is set up a PWM light modulation unit 1 and direct current light modulation unit 2, when LED low when interval at TV backlight illumination, the duty of the first pwm signal of Master control chip U1 output is smaller, light modulation drives chip U2 to adopt PWM light modulation, the ON time of LED is just along with the second pwm signal respective change because frequency ratio is higher, human eye perceives to be exactly the variation of brightness, make in the situation that LED-backlit brightness is lower, image quality is normal.When LED is when TV backlight illumination height is interval, the duty ratio of the first pwm signal of Master control chip U1 output is larger, and light modulation drives chip U2 to adopt direct current light modulation.Adopt direct current dimming mode, LED Chang Liang, regulates the electric current that flows through LED to carry out brightness adjusting.Flow through LED electric current and change according to the requirement of brightness, this electric current PWM light modulation On current 43% to 100% between change.This kind of dimming mode reduced the loss of electric current, improved the luminous efficiency of LED.
Particularly, the first energy-storage units 11 comprises the 3rd resistance R 3 and the first capacitor C 1, the 3rd resistance R 3 one end are connected with the first output of Master control chip U1, the other end of the 3rd resistance R 3 is through the first capacitor C 1 ground connection, and the 3rd resistance R 3 is connected with the base stage of the first triode Q1 through the first resistance R 1 with the node between the first capacitor C 1.
Particularly, the input of the first partial pressure unit 12 is connected with external dc power VCC, and output is connected with the base stage of the first triode Q1, and this first partial pressure unit 12 is external dc power VCC dividing potential drop, and provides bias voltage for the emitter junction of the first triode Q1.This first partial pressure unit 12 comprises the 4th resistance R 4 and the 5th resistance R 5, one end of the 4th resistance R 4 is connected with external dc power VCC, the other end of the 4th resistance R 4 is through the 5th resistance R 5 ground connection, and the 4th resistance R 4 is connected with the base stage of the first triode Q1 through the first resistance R 1 with the node between the 5th resistance R 5.
Particularly, the second energy-storage units 21 comprises the tenth resistance R 10 and the second capacitor C 2, one end of the tenth resistance R 10 is connected with the first output of Master control chip U1, the other end of the tenth resistance R 10 is through the second capacitor C 2 ground connection, and the tenth resistance R 10 is connected with the second partial pressure unit 23 with the node between the second capacitor C 2.
Particularly, the 3rd energy-storage units 22 comprises the 11 resistance R 11 and the 3rd capacitor C 3, one end of the 11 resistance R 11 is connected with the emitter of the 5th triode Q5, the other end of the 11 resistance R 11 is through the 3rd capacitor C 3 ground connection, and the 11 resistance R 11 is connected with the output of the 3rd partial pressure unit 24 with the node between the 3rd capacitor C 3.
Particularly, the input of the second partial pressure unit 23 is connected with the output of the second energy-storage units 21, and the voltage of the second energy-storage units 21 output is carried out to dividing potential drop, and provides bias voltage for the emitter of the 3rd triode Q3.This second partial pressure unit 23 comprises the 12 resistance R 12 and the 13 resistance R 13, one end of the 12 resistance R 12 is connected with the output of the second energy-storage units 21, the other end of the 12 resistance R 12 is through the 13 resistance R 13 ground connection, and the 12 resistance R 12 is connected with the base stage of the 3rd triode Q3 with the node between the 13 resistance R 13.
Particularly, when the duty ratio of the first pwm signal hour, the 5th triode Q5 in direct current light modulation unit 2 is in off state.The direct voltage of the output of direct current light modulation unit 2 is the voltage of the 3rd partial pressure unit 24 outputs so.Particularly, the 3rd partial pressure unit 24 comprises the 14 resistance R 14 and the 15 resistance R 15, one end of the 14 resistance R 14 is connected with external dc power VCC, the other end of the 14 resistance R 14 is through the 15 resistance R 15 ground connection, and the node between the 14 resistance R 14 and the 15 resistance R 15 is as the output of direct current light modulation unit 2.
The utility model also provides a kind of television set, and this television set comprises LED mixing light adjusting circuit.This LED mixing light adjusting circuit can, with reference to above-described embodiment, not repeat them here.Naturally, because the television set of the present embodiment has adopted the technical scheme of above-mentioned LED mixing light adjusting circuit, so this television set has all beneficial effects of above-mentioned LED mixing light adjusting circuit.
These are only preferred embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model specification 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 utility model.
Claims (10)
1. a LED mixing light adjusting circuit, for regulating the backlight illumination of LED TV, it is characterized in that, comprise that Master control chip, PWM light modulation unit, direct current light modulation unit and light modulation drive chip, wherein, described Master control chip is connected with described PWM light modulation unit, described Master control chip is connected with described direct current light modulation unit, described Master control chip also drives chip to be connected with described light modulation, described PWM light modulation unit drives chip to be connected with described light modulation, and described direct current light modulation unit drives chip to be connected with described light modulation;
The backlight illumination instruction that described Master control chip is set according to user produces the first pwm signal, and exports respectively described the first pwm signal to described PWM light modulation unit and direct current light modulation unit; The backlight illumination instruction that described Master control chip is also set user exports described light modulation to and drives chip;
Described PWM light modulation unit receives the first pwm signal of described Master control chip output and described the first pwm signal is processed, and processes and obtains the second pwm signal and export this second pwm signal to described light modulation driving chip;
Described direct current light modulation unit, receives the first pwm signal of described Master control chip output and described the first pwm signal is carried out to pressure regulation processing, and pressure regulation is processed and obtained d. c. voltage signal and export this d. c. voltage signal to light modulation driving chip;
The backlight illumination instruction that the user that described light modulation drives chip to receive the second pwm signal of described PWM light modulation unit output, the d. c. voltage signal of described direct current light modulation unit output and the output of described Master control chip sets; When the backlight illumination of described user's setting is less than preset value, described light modulation drives chip, according to the second pwm signal, described LED is carried out to PWM light modulation, when the backlight illumination of described user's setting is more than or equal to described preset value, described light modulation drives chip, according to d. c. voltage signal, described LED is carried out to direct current light modulation.
2. LED mixing light adjusting circuit as claimed in claim 1, it is characterized in that, described Master control chip comprises the first output, described the first output is connected with described PWM light modulation unit, described PWM light modulation unit comprises the first energy-storage units, the first partial pressure unit, the first resistance, the second resistance, the first triode and the second triode, the input of described the first energy-storage units is connected with the first output of described Master control chip, and the output of described the first energy-storage units is connected with the base stage of the first triode through the first resistance; The input of described the first partial pressure unit is connected with external dc power, and output is connected with the base stage of described the first triode through described the first resistance; The collector electrode of described the first triode is connected with described external dc power, grounded emitter; The collector electrode of described the first triode is connected with the base stage of described the second triode through described the second resistance, the grounded emitter of described the second triode, the collector electrode of described the second triode is connected with described external dc power and as the output of described PWM light modulation unit.
3. LED mixing light adjusting circuit as claimed in claim 2, it is characterized in that, described the first energy-storage units comprises the 3rd resistance and the first electric capacity, described the 3rd resistance one end is connected with the first output of described Master control chip, the other end of described the 3rd resistance is through the first capacity earth, and described the 3rd resistance is connected with the base stage of described the first triode through described the first resistance with the node between the first electric capacity.
4. LED mixing light adjusting circuit as claimed in claim 2, it is characterized in that, described the first partial pressure unit comprises the 4th resistance and the 5th resistance, one end of described the 4th resistance is connected with described external dc power, the other end of described the 4th resistance is through the 5th grounding through resistance, and described the 4th resistance is connected with the base stage of described the first triode through described the first resistance with the node between described the 5th resistance.
5. LED mixing light adjusting circuit as claimed in claim 1, it is characterized in that, described Master control chip comprises the first output, described the first output is connected with described direct current light modulation unit, and described direct current light modulation unit comprises the second energy-storage units, the 3rd energy-storage units, the second partial pressure unit, the 3rd partial pressure unit and the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance and the 3rd triode, the 4th triode, the 5th triode; The input of described the second energy-storage units is connected with the first output of described Master control chip, and output is connected with the base stage of described the 3rd triode through the second partial pressure unit; The collector electrode of described the 3rd triode is connected with the base stage of the 4th triode through the 6th resistance, and the emitter of described the 3rd triode is connected with external dc power through the 7th resistance, and the emitter of described the 3rd triode is through described the 8th grounding through resistance; The collector electrode of described the 4th triode is connected with described external dc power through the 9th resistance, grounded emitter; The base stage of the 5th triode is connected with the collector electrode of described the 4th triode, collector electrode is connected with the output of described the second energy-storage units, emitter is connected with the output of described the 3rd partial pressure unit through the 3rd energy-storage units, the input of described the 3rd partial pressure unit is connected with described external dc power, and the output of described the 3rd partial pressure unit is as the output of described direct current light modulation unit.
6. LED mixing light adjusting circuit as claimed in claim 5, it is characterized in that, described the second energy-storage units comprises the tenth resistance and the second electric capacity, one end of described the tenth resistance is connected with the first output of described Master control chip, the other end of described the tenth resistance is through the second capacity earth, and described the tenth resistance is connected with described the second partial pressure unit with the node between described the second electric capacity.
7. LED mixing light adjusting circuit as claimed in claim 5, it is characterized in that, described the 3rd energy-storage units comprises the 11 resistance and the 3rd electric capacity, one end of described the 11 resistance is connected with the emitter of described the 5th triode, the other end of described the 11 resistance is through the 3rd capacity earth, and described the 11 resistance is connected with the output of described the 3rd partial pressure unit with the node between described the 3rd electric capacity.
8. LED mixing light adjusting circuit as claimed in claim 5, it is characterized in that, described the second partial pressure unit comprises the 12 resistance and the 13 resistance, one end of described the 12 resistance is connected with the output of described the second energy-storage units, the other end of described the 12 resistance is through the 13 grounding through resistance, and the 12 resistance is connected with the base stage of described the 3rd triode with the node between the 13 resistance.
9. LED mixing light adjusting circuit as claimed in claim 5, it is characterized in that, described the 3rd partial pressure unit comprises the 14 resistance and the 15 resistance, one end of described the 14 resistance is connected with described external dc power, the other end of described the 14 resistance is through the 15 grounding through resistance, and the node between described the 14 resistance and described the 15 resistance is as the output of described direct current light modulation unit.
10. a television set, is characterized in that, comprises the LED mixing light adjusting circuit as described in claim 1 to 9 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320772886.2U CN203788378U (en) | 2013-11-28 | 2013-11-28 | LED hybrid light modulation circuit and television set |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320772886.2U CN203788378U (en) | 2013-11-28 | 2013-11-28 | LED hybrid light modulation circuit and television set |
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| Publication Number | Publication Date |
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| CN203788378U true CN203788378U (en) | 2014-08-20 |
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| CN201320772886.2U Expired - Lifetime CN203788378U (en) | 2013-11-28 | 2013-11-28 | LED hybrid light modulation circuit and television set |
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| CN (1) | CN203788378U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109712468A (en) * | 2018-12-21 | 2019-05-03 | 广州文兴电子科技有限公司 | A kind of liquid crystal imitation screen based under novel dimming mechanism |
| CN109859721A (en) * | 2019-04-02 | 2019-06-07 | Oppo广东移动通信有限公司 | Brightness of display screen adjusting method, device, mobile terminal and storage medium |
| CN110010085A (en) * | 2019-03-28 | 2019-07-12 | 深圳创维－Rgb电子有限公司 | A kind of backlight drive adjusts circuit, chip and method |
-
2013
- 2013-11-28 CN CN201320772886.2U patent/CN203788378U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109712468A (en) * | 2018-12-21 | 2019-05-03 | 广州文兴电子科技有限公司 | A kind of liquid crystal imitation screen based under novel dimming mechanism |
| CN110010085A (en) * | 2019-03-28 | 2019-07-12 | 深圳创维－Rgb电子有限公司 | A kind of backlight drive adjusts circuit, chip and method |
| CN110010085B (en) * | 2019-03-28 | 2021-07-27 | 深圳创维－Rgb电子有限公司 | Backlight driving adjusting circuit, chip and method |
| CN109859721A (en) * | 2019-04-02 | 2019-06-07 | Oppo广东移动通信有限公司 | Brightness of display screen adjusting method, device, mobile terminal and storage medium |
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Granted publication date: 20140820 |
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| CX01 | Expiry of patent term |