CN204270639U - Liquid crystal display LED backlight dynamic light adjustment device - Google Patents
Liquid crystal display LED backlight dynamic light adjustment device Download PDFInfo
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- CN204270639U CN204270639U CN201420701106.XU CN201420701106U CN204270639U CN 204270639 U CN204270639 U CN 204270639U CN 201420701106 U CN201420701106 U CN 201420701106U CN 204270639 U CN204270639 U CN 204270639U
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Abstract
The utility model discloses a kind of liquid crystal display LED backlight dynamic light adjustment device, include controller, initialization circuit, compensation LED lamp, light circuit for detecting and light adjusting circuit, this initialization circuit, compensation LED lamp, light circuit for detecting are all connected with controller with light adjusting circuit, and this compensation LED lamp and light circuit for detecting are all positioned at LED backlight; This light adjusting circuit includes resistance R1, resistance R2, resistance R3, triode Q1, triode Q1 and electric capacity C1; By this, by utilizing initialization circuit, parameter is set, utilize light circuit for detecting to carry out brightness to LED backlight to detect in real time, and coordinate light adjusting circuit to carry out brightness adjustment to LED backlight, achieve the object of automatic dynamic light adjustment, instead of hand-operating light, thus offer convenience to use, simultaneously by being provided with compensation LED lamp, can open as required, realizing LED backlight high brightness luminous.
Description
Technical field
The utility model relates to backlight art, refers in particular to a kind of liquid crystal display LED backlight dynamic light adjustment device.
Background technology
Backlight (Back Light) is positioned at liquid crystal display (LCD) a kind of light source behind, and its illumination effect will directly have influence on LCD MODULE (LCM) visual effect.Liquid crystal display itself is not luminous, and its display graphics or character are the results that it is modulated light.
Current backlight is LED backlight, occurs optical attenuation, in order to ensure back light source brightness because LED lights up as a long time, need to carry out light modulation to backlight, but current backlight generally manually can only carry out light modulation, automatically can not carry out light modulation, thus make troubles to use.
Utility model content
In view of this, the utility model is for the disappearance of prior art existence, and its fundamental purpose is to provide a kind of liquid crystal display LED backlight dynamic light adjustment device, and it effectively can solve existing backlight needs manually to carry out light modulation to using the problem of making troubles.
For achieving the above object, the utility model adopts following technical scheme:
A kind of liquid crystal display LED backlight dynamic light adjustment device, include controller, initialization circuit, compensation LED lamp, light circuit for detecting and light adjusting circuit, this initialization circuit, compensation LED lamp, light circuit for detecting are all connected with controller with light adjusting circuit, and this compensation LED lamp and light circuit for detecting are all positioned at LED backlight; This light adjusting circuit includes resistance R1, resistance R2, resistance R3, triode Q1, triode Q1 and electric capacity C1; One end of this resistance R1 connects PWM pulse signal source, the base stage of the other end of resistance R1 and one end difference connecting triode Q1 of resistance R3, the collector of one end of this resistance R2 and the collector difference connecting triode Q2 of triode Q1, the base stage of the emitter connecting triode Q2 of triode Q1, one end ground connection of the other end of resistance R3, the emitter of triode Q2 and electric capacity C1, the resistance R2 other end connects LED backlight negative pole, and LED backlight positive pole is connected D.C. regulated power supply V+ with the electric capacity C1 other end.
As a kind of preferred version, described triode Q1 and triode Q2 is NPN transistor.
As a kind of preferred version, described resistance R1 is 2.2k Ω ~ 47k Ω, and this resistance R3 is 3 ~ 5 times of resistance R1 resistance.
As a kind of preferred version, described electric capacity C1 is 1 μ F ~ 100 μ F.
As a kind of preferred version, described smooth circuit for detecting is optical sensor.
The utility model compared with prior art has obvious advantage and beneficial effect, specifically, as shown from the above technical solution:
By utilizing initialization circuit, parameter is set, utilize light circuit for detecting to carry out brightness to LED backlight to detect in real time, and coordinate light adjusting circuit to carry out brightness adjustment to LED backlight, achieve the object of automatic dynamic light adjustment, instead of hand-operating light, thus offer convenience to use, simultaneously by being provided with compensation LED lamp, can open as required, realize LED backlight high brightness luminous.
For more clearly setting forth architectural feature of the present utility model and effect, below in conjunction with accompanying drawing and specific embodiment, the utility model is described in detail.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the preferred embodiment of the utility model;
Fig. 2 is the structural representation of light adjusting circuit in the preferred embodiment of the utility model.
Accompanying drawing identifier declaration:
10, controller 20, initialization circuit
30, compensation LED lamp 40, light circuit for detecting
50, light adjusting circuit 60, LED backlight.
Embodiment
Please refer to shown in Fig. 1 and Fig. 2, that show the concrete structure of the preferred embodiment of the utility model, include controller 10, initialization circuit 20, compensation LED lamp 30, light circuit for detecting 40 and light adjusting circuit 50.
This initialization circuit 20, compensation LED lamp 30, light circuit for detecting 40 are all connected with controller 10 with light adjusting circuit 50, this initialization circuit 20 is for setting various parameters such as brightness, this compensation LED lamp 30 and light circuit for detecting 40 are all positioned at LED backlight 60, this compensation LED lamp 30 is for opening as required, to carry out light compensation, this light circuit for detecting 40 is for sensing the brightness of LED backlight 60, and in the present embodiment, this light circuit for detecting 40 is optical sensor.
As shown in Figure 2, this light adjusting circuit 50 includes resistance R1, resistance R2, resistance R3, triode Q1, triode Q1 and electric capacity C1; One end of this resistance R1 connects PWM pulse signal source, the base stage of the other end of resistance R1 and one end difference connecting triode Q1 of resistance R3, the collector of one end of this resistance R2 and the collector difference connecting triode Q2 of triode Q1, the base stage of the emitter connecting triode Q2 of triode Q1, one end ground connection of the other end of resistance R3, the emitter of triode Q2 and electric capacity C1, the resistance R2 other end connects LED backlight 60 negative pole, and LED backlight 60 positive pole is connected D.C. regulated power supply V+ with the electric capacity C1 other end.In the present embodiment, this triode Q1 and triode Q2 is NPN transistor, and this resistance R1 is 2.2k Ω ~ 47k Ω, and this resistance R3 is 3 ~ 5 times of resistance R1 resistance, and this electric capacity C1 is 1 μ F ~ 100 μ F.
The course of work that the present embodiment is described in detail in detail is as follows:
During work, first, by initialization circuit 20, various parameter is set; Then, in real time the brightness of LED backlight 60 is detected by light circuit for detecting 40, when the brightness of LED backlight 60 is too high or too low, controller 10 controls light adjusting circuit 50 and works, by choosing resistance R1 and the resistance R2 of suitable resistance, saturation degree during triode Q1 conducting is controlled between 5 ~ 100; When pwm signal being in low level, triode Q1 base stage voltage-to-ground controls at below 1V simultaneously, because be in the degree of depth state of saturation during triode Q1 conducting, so now Vce1 ≈ 0V, due to Vcb2=Vce1, so Vcb2 ≈ 0V, so no matter the DC amplification factor hFE2 of triode Q2 is how many, during triode Q2 conducting all by steady operation in critical statisfaction state (unsaturation type switch), therefore export the time that PWM pulse signal is extended very short; When PWM control signal is low level, triode Q1 and triode Q2 also can end completely.Even if input the PWM signal of very low duty ratio like this, this light adjusting circuit 50 also can be in close proximity to desirable linear response.Again by stable working state during triode Q2 conducting, Vce2=Vcb2+Vbe2 ≈ Vbe2, and the emitter junction pressure drop Vbe difference very little (silicone tube is about 0.6 ~ 0.7V) between same model individual transistor, so the individual difference of triode Q1, triode Q2 causes additional effect to the low brightness values of LED backlight 60 hardly.And when needs improve LED backlight brightness further, realize more high brightness by opening compensation LED lamp 30.
Design focal point of the present utility model is: set parameter by utilizing initialization circuit, utilize light circuit for detecting to carry out brightness to LED backlight to detect in real time, and coordinate light adjusting circuit to carry out brightness adjustment to LED backlight, achieve the object of automatic dynamic light adjustment, instead of hand-operating light, thus offer convenience to use, simultaneously by being provided with compensation LED lamp, can open as required, realize LED backlight high brightness luminous.
The above, it is only preferred embodiment of the present utility model, not technical scope of the present utility model is imposed any restrictions, therefore every above embodiment is done according to technical spirit of the present utility model any trickle amendment, equivalent variations and modification, all still belong in the scope of technical solutions of the utility model.
Claims (5)
1. a liquid crystal display LED backlight dynamic light adjustment device, it is characterized in that: include controller, initialization circuit, compensation LED lamp, light circuit for detecting and light adjusting circuit, this initialization circuit, compensation LED lamp, light circuit for detecting are all connected with controller with light adjusting circuit, and this compensation LED lamp and light circuit for detecting are all positioned at LED backlight; This light adjusting circuit includes resistance R1, resistance R2, resistance R3, triode Q1, triode Q1 and electric capacity C1; One end of this resistance R1 connects PWM pulse signal source, the base stage of the other end of resistance R1 and one end difference connecting triode Q1 of resistance R3, the collector of one end of this resistance R2 and the collector difference connecting triode Q2 of triode Q1, the base stage of the emitter connecting triode Q2 of triode Q1, one end ground connection of the other end of resistance R3, the emitter of triode Q2 and electric capacity C1, the resistance R2 other end connects LED backlight negative pole, and LED backlight positive pole is connected D.C. regulated power supply V+ with the electric capacity C1 other end.
2. liquid crystal display LED backlight dynamic light adjustment device according to claim 1, is characterized in that: described triode Q1 and triode Q2 is NPN transistor.
3. liquid crystal display LED backlight dynamic light adjustment device according to claim 1, it is characterized in that: described resistance R1 is 2.2k Ω ~ 47k Ω, this resistance R3 is 3 ~ 5 times of resistance R1 resistance.
4. liquid crystal display LED backlight dynamic light adjustment device according to claim 1, is characterized in that: described electric capacity C1 is 1 μ F ~ 100 μ F.
5. liquid crystal display LED backlight dynamic light adjustment device according to claim 1, is characterized in that: described smooth circuit for detecting is optical sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420701106.XU CN204270639U (en) | 2014-11-21 | 2014-11-21 | Liquid crystal display LED backlight dynamic light adjustment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420701106.XU CN204270639U (en) | 2014-11-21 | 2014-11-21 | Liquid crystal display LED backlight dynamic light adjustment device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204270639U true CN204270639U (en) | 2015-04-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420701106.XU Expired - Fee Related CN204270639U (en) | 2014-11-21 | 2014-11-21 | Liquid crystal display LED backlight dynamic light adjustment device |
Country Status (1)
| Country | Link |
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| CN (1) | CN204270639U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107809822A (en) * | 2017-10-26 | 2018-03-16 | 惠科股份有限公司 | Brightness control device and method for light emitting diode light source |
| CN108235502A (en) * | 2017-01-19 | 2018-06-29 | 肖志军 | The constant current driving method and circuit of LED light light modulation |
| CN108305588A (en) * | 2018-02-02 | 2018-07-20 | 惠科股份有限公司 | Display device |
| CN108335676A (en) * | 2018-02-02 | 2018-07-27 | 惠科股份有限公司 | Display device |
| CN108364612A (en) * | 2018-02-02 | 2018-08-03 | 惠科股份有限公司 | Display device |
-
2014
- 2014-11-21 CN CN201420701106.XU patent/CN204270639U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108235502A (en) * | 2017-01-19 | 2018-06-29 | 肖志军 | The constant current driving method and circuit of LED light light modulation |
| CN107809822A (en) * | 2017-10-26 | 2018-03-16 | 惠科股份有限公司 | Brightness control device and method for light emitting diode light source |
| CN108305588A (en) * | 2018-02-02 | 2018-07-20 | 惠科股份有限公司 | Display device |
| CN108335676A (en) * | 2018-02-02 | 2018-07-27 | 惠科股份有限公司 | Display device |
| CN108364612A (en) * | 2018-02-02 | 2018-08-03 | 惠科股份有限公司 | Display device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150415 Termination date: 20171121 |
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| CF01 | Termination of patent right due to non-payment of annual fee |