CN205566737U - Circuit in a poor light of VR display screen - Google Patents
Circuit in a poor light of VR display screen Download PDFInfo
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- CN205566737U CN205566737U CN201620266541.3U CN201620266541U CN205566737U CN 205566737 U CN205566737 U CN 205566737U CN 201620266541 U CN201620266541 U CN 201620266541U CN 205566737 U CN205566737 U CN 205566737U
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- backlight
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- led drive
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Abstract
The utility model discloses a circuit in a poor light of VR display screen for realize the luminous uniformity of two display screens of VR display screen, the embodiment of the utility model provides a circuit in a poor light includes: first in a poor light LED banks, second LED banks in a poor light and LED drive circuit, first in a poor light LED banks with second LED banks in a poor light is established ties, LED drive circuit connects first in a poor light LED banks with the second LED banks that is shaded, for first in a poor light LED banks with second LED banks in a poor light provides fixed operating current or operating voltage. The utility model discloses being shaded the LED banks to two the tunnel and establishing ties, adopt same LED drive circuit to drive, the two tunnel to be shaded the operating current of LED banks unanimous and invariable, this scheme simple and practical, and saved circuit component, require circuit component not high yet, greatly reduced the manufacturing cost of VR equipment.
Description
Technical field
This utility model relates to the technical field that VR shows, particularly relates to the backlight electricity of a kind of VR display screen
Road.
Background technology
Head in current fast-developing VR (Virtual Reality, virtual reality) field shows in equipment,
Two LED displays will be used, in the backlight illumination scheme of two LED screen, typically have three kinds of realities
Existing scheme, be i.e. two independent constant voltages drive, two independent constant-current driving, two-way or multi-way LED lamp electricity
Mobile equilibrium circuit design.
For the first string, i.e. two independent constant voltages drive, and the luminescence of LED is the pass that is directly proportional to electric current
System, voltage is to change electric current thus changes the luminescence of LED, then, because of the work electricity of different LED
There are some differences in pressure, the luminosity of LED exists for difference.
For second scheme, i.e. two independent constant-current driving, due to two independent constant-current driving, its
All devices in constant-current driving, including IC, inductance, all there is error in feedback resistance, therefore brightness is very
Difficult concordance.
For the 3rd scheme, two-way or the design of multi-way LED lamp current equalization circuit, this design is substantially
It is exactly that two or more independent constant-current driving are concentrated in IC or MCU, utilizes high-precision
AD mouth carries out voltage reading to feedback resistance, then to two or more feedback electricity inside IC or MCU
Pressure ratio row compares, then removes to adjust the pwm signal of that paths of LEDs lamp driving of difference, this programme advantage ratio
Above two-way compares equilibrium electricity in current design, i.e. the more consistent property of brightness ratio is higher, but shortcoming is cost
Height is high to requirement on devices.
Utility model content
This utility model embodiment provides the backlight circuit of a kind of VR display screen, solves above technology and asks
Topic.
For reaching this purpose, this utility model by the following technical solutions:
This utility model provides the backlight circuit of a kind of VR display screen, including: the first backlight LED light group,
Second backlight LED light group and LED drive circuit；
Described first backlight LED light group and described second backlight LED light group series connection；
Described LED drive circuit connects described first backlight LED light group and described second backlight LED light
Group, provides fixing operating current for described first backlight LED light group and described second backlight LED light group
Or running voltage.
Two-way backlight LED light group is together in series, uses same LED drive circuit to drive, two-way
The operating current of backlight LED light group is consistent and constant, and the program is simple and practical, and saves component,
Component is required the highest, greatly reduces the production cost of VR equipment；Although the program exists one
Fixed defect, the i.e. LED of a display screen go wrong, and two-way backlight LED light group all cannot be normal
Display, but VR display backlight apply in, if a display screen goes wrong, its most without
Method normally watches image, therefore in VR display backlight is applied, this defect is not genuine defect.
Preferably, described LED drive circuit includes LED drive chip, inductance L1, diode D8
With resistance R1；
6th pin of described LED drive chip connects has DC source, for described LED drive chip
Power input pin；
6th pin of described LED drive chip is also connected with the first end and the described LED driving of inductance L1
4th pin of chip；First pin of described LED drive chip connects second end of inductance L1；Institute
The 3rd pin stating LED drive chip connects first end of resistance R1, the second end ground connection of resistance R1；
Second end of inductance L1 is also connected with the positive pole of diode D8, and the negative pole of diode D8 connects described
The anode connection terminal of the first backlight LED light group；The negative pole of described first backlight LED light group connects end and connects
The anode connection terminal of described second backlight LED light group, the negative pole of described second backlight LED light group connects end
Connect first end of resistance R1；
Wherein, described LED drive chip uses the model that Wuxi Chipown Microelectronics Co., Ltd. produces
Driving chip for AP3127B.
In this utility model, the driving chip of AP3127B is that the step-up DC/DC of a constant current output turns
Parallel operation.This embodiment carries out electrical connection as above by driving chip and the associated circuit components of AP3127B
After, described LED drive circuit is a constant-current drive circuit, and the negative pole of diode D8 is electric current output
End, provides constant electric current output for two-way backlight LED light group.
Preferably, described LED drive circuit also includes that filter capacitor, described filter capacitor include electric capacity C1
With electric capacity C2；
The positive pole of electric capacity C1 connects the 6th pin of described LED drive chip, the minus earth of electric capacity C1；
The negative pole of the cathode connecting diode D8 of electric capacity C2, the minus earth of electric capacity C2.
Preferably, described LED drive circuit include LED drive chip, inductance L1, diode D8,
Resistance R1, resistance R2 and resistance R3；
6th pin of described LED drive chip connects has DC source, for described LED drive chip
Power input pin；
6th pin of described LED drive chip is also connected with the first end and the described LED driving of inductance L1
4th pin of chip；First pin of described LED drive chip connects second end of inductance L1；Institute
The 3rd pin stating LED drive chip connects first end of resistance R2, the second end ground connection of resistance R2；
First end of resistance R2 is also connected with second end of resistance R3, and first end of resistance R3 connects diode D8
Negative pole；
Second end of inductance L1 is also connected with the positive pole of diode D8, and the negative pole of diode D8 connects described
The anode connection terminal of the first backlight LED light group；The negative pole of described first backlight LED light group connects end and connects
The anode connection terminal of described second backlight LED light group, the negative pole of described second backlight LED light group connects end
Connect first end of resistance R1；The second end ground connection of resistance R1；
Wherein, described LED drive chip uses the model that Wuxi Chipown Microelectronics Co., Ltd. produces
Driving chip for AP3127B.
This embodiment carries out electrical connection as above by driving chip and the associated circuit components of AP3127B
After, described LED drive circuit is a constant voltage drive circuit, and the negative pole of diode D8 is voltage output
End, provides constant voltage output for two-way backlight LED light group.Wherein, inductance L1, diode D8,
Resistance R2 and resistance R3 forms a booster circuit；Choosing by two-way backlight LED light group of output voltage
LED number determine；Resistance R1 is for adjusting the electric current of LED.Backlight for two-way series connection
LED group, after the running voltage at two ends determines, operating current determines therewith, and the backlight of two-way series connection
LED group is consistent, and the characteristics of luminescence is the most consistent.
Preferably, described LED drive chip is that the model of Wuxi Chipown Microelectronics Co., Ltd. is
The driving chip of AP3127B；
Described LED drive circuit also includes that filter capacitor, described filter capacitor include electric capacity C1 and electric capacity
C2；The positive pole of electric capacity C1 connects the 6th pin of described LED drive chip, and the negative pole of electric capacity C1 connects
Ground；The negative pole of the cathode connecting diode D8 of electric capacity C2, the minus earth of electric capacity C2.
Preferably, described DC source is+5V DC source.
Preferably, described first backlight LED light group includes one or more LED；Described second backlight
LED group includes one or more LED.
Preferably, VR display screen includes a VR display screen and the 2nd VR display screen；
First backlight LED light group is the backlight of a VR display screen, and the second backlight LED light group is
The backlight of two VR display screens.
Preferably, diode D8 is Zener diode.
The beneficial effects of the utility model: two-way backlight LED light group is together in series, uses same LED
Drive circuit drives, and the operating current of two-way backlight LED light group is consistent and constant, and the program is the most real
With, and save component, component is required the highest, greatly reduces the production of VR equipment
Cost.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will
The accompanying drawing used required in embodiment or description of the prior art is briefly described, it should be apparent that,
Accompanying drawing in describing below is only embodiments more of the present utility model, for ordinary skill people
From the point of view of Yuan, on the premise of not paying creative work, it is also possible to obtain other according to these accompanying drawings
Accompanying drawing.
Fig. 1 is the circuit theory diagrams of a kind of backlight circuit of VR display screen described in the utility model.
Fig. 2 is the circuit theory diagrams of the another kind of backlight circuit of VR display screen described in the utility model.
In figure:
10, the first backlight LED light group；20, the second backlight LED light group；30, LED drive circuit；
31, LED drive chip.
Detailed description of the invention
This utility model embodiment provides the backlight circuit of a kind of VR display screen, is used for realizing VR and shows
The emission uniformity of two display screens of screen.
For making utility model purpose of the present utility model, feature, the advantage can be the most obvious and understandable,
Below in conjunction with the accompanying drawing in this utility model embodiment, to the technical scheme in this utility model embodiment
It is clearly and completely described, it is clear that the embodiments described below are only this utility model one
Point embodiment, and not all embodiment.Based on the embodiment in this utility model, the common skill in this area
All other embodiments that art personnel are obtained under not making creative work premise, broadly fall into this reality
By novel protected scope.
Further illustrate technical side of the present utility model below in conjunction with the accompanying drawings and by detailed description of the invention
Case.
Refer to the circuit that Fig. 1, Fig. 1 are a kind of backlight circuits of VR display screen described in the utility model
Schematic diagram.In figure ,+VCC is DC source.
This backlight circuit specifically includes: first backlight LED light group the 10, second backlight LED light group 20 and
LED drive circuit 30.
Power input connection+the VCC of LED drive circuit 30, the first backlight LED light group 10 and
Two backlight LED light groups 20 are connected.
The current output terminal of LED drive circuit 30 connects the electrode input end of the first backlight LED light group 10,
The negative input of the second backlight LED light group 20 connects the pressure feedback port of LED drive circuit 30.
Concrete, LED drive circuit 30 includes LED drive chip 31, inductance L1, diode D8
With resistance R1.Wherein, diode D8 is Zener diode.
In the present embodiment, LED drive chip 31 uses Wuxi Chipown Microelectronics Co., Ltd. to produce
Model is the driving chip of AP3127B.6th pin connection+VCC of LED drive chip 31, for
The power input pin of LED drive chip 31.
6th pin of LED drive chip 31 is also connected with the first end and the LED drive chip of inductance L1
4th pin of 31；First pin of LED drive chip 31 connects second end of inductance L1；LED drives
3rd pin of dynamic chip 31 connects first end of resistance R1, the second end ground connection of resistance R1；Inductance
Second end of L1 is also connected with the positive pole of diode D8, and the negative pole of diode D8 connects the first backlight LED
The anode connection terminal of lamp group 10；The negative pole of the first backlight LED light group 10 connects end and connects the second backlight LED
The anode connection terminal of lamp group 20, the negative pole of the second backlight LED light group 20 connects end and connects resistance R1's
First end.
In the present embodiment, the first pin of LED drive chip 31 is current/voltage output pin, LED
Second pin of driving chip 31 is power supply ground pin, and the 3rd pin of LED drive chip 31 is voltage
Feedback pin, the 4th pin position chip of LED drive chip 31 enables pin, and high level is effective, LED
5th pin of driving chip 31 is overvoltage protection pin, and in the present embodiment, this pin is unsettled, and LED drives
6th pin of chip 31 is power input pin.
Concrete, LED drive circuit 30 also includes that filter capacitor, described filter capacitor include electric capacity C1
With electric capacity C2；The positive pole of electric capacity C1 connects the 6th pin of LED drive chip 31, and electric capacity C1's is negative
Pole ground connection；The negative pole of the cathode connecting diode D8 of electric capacity C2, the minus earth of electric capacity C2.
In the present embodiment, the driving chip of AP3127B is the step-up DC/DC conversion of a constant current output
Device.After carrying out electrical connection as above by the driving chip of AP3127B and associated circuit components, described LED
Drive circuit is a constant-current drive circuit, and the negative pole of diode D8 is current output terminal, for two-way backlight
LED group provides constant electric current output.
Refer to the electricity that Fig. 2, Fig. 2 are the another kind of backlight circuits of VR display screen described in the utility model
Road schematic diagram.In figure ,+VCC is DC source.
LED drive circuit 30 include LED drive chip 31, inductance L1, diode D8, resistance R1,
Resistance R2 and resistance R3.
In the present embodiment, LED drive chip 31 uses Wuxi Chipown Microelectronics Co., Ltd. to produce
Model is the driving chip of AP3127B.6th pin connection+VCC of LED drive chip 31, for institute
State the power input pin of LED drive chip.
6th pin of LED drive chip 31 is also connected with the first end and the LED drive chip of inductance L1
4th pin of 31；First pin of LED drive chip 31 connects second end of inductance L1；LED drives
3rd pin of dynamic chip 31 connects first end of resistance R2, the second end ground connection of resistance R2；Resistance
First end of R2 is also connected with second end of resistance R3, and first end of resistance R3 connects the negative of diode D8
Pole；Second end of inductance L1 is also connected with the positive pole of diode D8, and the negative pole of diode D8 connects first
The anode connection terminal of backlight LED light group 10；The negative pole of the first backlight LED light group 10 connects end and connects the
The anode connection terminal of two backlight LED light groups 20, the negative pole of the second backlight LED light group 20 connects end and connects
First end of resistance R1；The second end ground connection of resistance R1.
In the present embodiment, the driving chip of AP3127B is the step-up DC/DC conversion of a constant current output
Device.After this embodiment carries out electrical connection as above by the driving chip of AP3127B and associated circuit components,
LED drive circuit 30 is a constant voltage drive circuit, and the negative pole of diode D8 is voltage output end, for
Two-way backlight LED light group provides constant voltage output.Wherein, inductance L1, diode D8, resistance
R2 and resistance R3 forms a booster circuit；Choosing by two-way backlight LED light group of output voltage
LED number determines；Resistance R1 is for adjusting the electric current of LED.Backlight LED for two-way series connection
Lamp group, after the running voltage at two ends determines, operating current determines therewith, and backlight LED of two-way series connection
Lamp group is consistent, and the characteristics of luminescence is the most consistent.
Concrete, LED drive circuit 30 also includes that filter capacitor, described filter capacitor include electric capacity C1
With electric capacity C2；The positive pole of electric capacity C1 connects the 6th pin of LED drive chip 31, and electric capacity C1's is negative
Pole ground connection；The negative pole of the cathode connecting diode D8 of electric capacity C2, the minus earth of electric capacity C2.
In the present embodiment, described DC source is preferably+5V DC source.
In the present embodiment, the first backlight LED light group 10 includes one or more LED；Second backlight
LED group 10 includes one or more LED.
It should be noted that depending on the quantity of LED can be according to concrete application scenarios, it should not be understood
For to restriction of the present utility model.In like manner, the parameter of the component of backlight circuit can be answered according to concrete
Depending on scene, it should not be construed as restriction of the present utility model.
For ease of understanding, VR display screen includes a VR display screen and the 2nd VR display screen.VR shows
Display screen is generally LCDs.First backlight LED light group 10 is the backlight of a VR display screen,
Second backlight LED light group 20 is the backlight of the 2nd VR display screen.
The above, above example is only in order to illustrate the technical solution of the utility model, rather than limits it
System；Although this utility model being described in detail with reference to previous embodiment, the common skill of this area
Art personnel it is understood that the technical scheme described in foregoing embodiments still can be modified by it,
Or wherein portion of techniques feature is carried out equivalent；And these amendments or replacement, do not make corresponding
The essence of technical scheme departs from the spirit and scope of this utility model each embodiment technical scheme.
Claims (9)
1. the backlight circuit of a VR display screen, it is characterised in that including: the first backlight LED light group,
Second backlight LED light group and LED drive circuit；
Described first backlight LED light group and described second backlight LED light group series connection；
Described LED drive circuit connects described first backlight LED light group and described second backlight LED light
Group, provides fixing operating current for described first backlight LED light group and described second backlight LED light group
Or running voltage.
Backlight circuit the most according to claim 1, it is characterised in that described LED drive circuit
Including LED drive chip, inductance L1, diode D8 and resistance R1；
6th pin of described LED drive chip connects has DC source, for described LED drive chip
Power input pin；
6th pin of described LED drive chip is also connected with the first end and the described LED driving of inductance L1
4th pin of chip；First pin of described LED drive chip connects second end of inductance L1；Institute
The 3rd pin stating LED drive chip connects first end of resistance R1, the second end ground connection of resistance R1；
Second end of inductance L1 is also connected with the positive pole of diode D8, and the negative pole of diode D8 connects described
The anode connection terminal of the first backlight LED light group；The negative pole of described first backlight LED light group connects end and connects
The anode connection terminal of described second backlight LED light group, the negative pole of described second backlight LED light group connects end
Connect first end of resistance R1；
Wherein, described LED drive chip uses the model that Wuxi Chipown Microelectronics Co., Ltd. produces
Driving chip for AP3127B.
Backlight circuit the most according to claim 2, it is characterised in that described LED drive circuit
Also include that filter capacitor, described filter capacitor include electric capacity C1 and electric capacity C2；
The positive pole of electric capacity C1 connects the 6th pin of described LED drive chip, the minus earth of electric capacity C1；
The negative pole of the cathode connecting diode D8 of electric capacity C2, the minus earth of electric capacity C2.
Backlight circuit the most according to claim 1, it is characterised in that described LED drive circuit
Including LED drive chip, inductance L1, diode D8, resistance R1, resistance R2 and resistance R3；
6th pin of described LED drive chip connects has DC source, for described LED drive chip
Power input pin；
6th pin of described LED drive chip is also connected with the first end and the described LED driving of inductance L1
4th pin of chip；First pin of described LED drive chip connects second end of inductance L1；Institute
The 3rd pin stating LED drive chip connects first end of resistance R2, the second end ground connection of resistance R2；
First end of resistance R2 is also connected with second end of resistance R3, and first end of resistance R3 connects diode D8
Negative pole；
Second end of inductance L1 is also connected with the positive pole of diode D8, and the negative pole of diode D8 connects described
The anode connection terminal of the first backlight LED light group；The negative pole of described first backlight LED light group connects end and connects
The anode connection terminal of described second backlight LED light group, the negative pole of described second backlight LED light group connects end
Connect first end of resistance R1；The second end ground connection of resistance R1；
Wherein, described LED drive chip uses the model that Wuxi Chipown Microelectronics Co., Ltd. produces
Driving chip for AP3127B.
Backlight circuit the most according to claim 4, it is characterised in that described LED drive circuit
Also include that filter capacitor, described filter capacitor include electric capacity C1 and electric capacity C2；The positive pole of electric capacity C1 connects
6th pin of described LED drive chip, the minus earth of electric capacity C1；The positive pole of electric capacity C2 connects two
The negative pole of pole pipe D8, the minus earth of electric capacity C2.
Backlight circuit the most according to claim 2, it is characterised in that described DC source is+5V
DC source.
Backlight circuit the most according to claim 1, it is characterised in that described first backlight LED
Lamp group includes one or more LED；Described second backlight LED light group includes one or more LED
Lamp.
Backlight circuit the most according to claim 1, it is characterised in that VR display screen includes first
VR display screen and the 2nd VR display screen；
First backlight LED light group is the backlight of a VR display screen, and the second backlight LED light group is
The backlight of two VR display screens.
Backlight circuit the most as claimed in any of claims 2 to 6, it is characterised in that two poles
Pipe D8 is Zener diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620266541.3U CN205566737U (en) | 2016-03-31 | 2016-03-31 | Circuit in a poor light of VR display screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620266541.3U CN205566737U (en) | 2016-03-31 | 2016-03-31 | Circuit in a poor light of VR display screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205566737U true CN205566737U (en) | 2016-09-07 |
Family
ID=56813670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620266541.3U Active CN205566737U (en) | 2016-03-31 | 2016-03-31 | Circuit in a poor light of VR display screen |
Country Status (1)
| Country | Link |
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| CN (1) | CN205566737U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105636280A (en) * | 2016-03-31 | 2016-06-01 | 深圳多哚新技术有限责任公司 | Backlight circuit of VR display |
| CN109036294A (en) * | 2018-08-01 | 2018-12-18 | 重庆爱奇艺智能科技有限公司 | Screen for VR equipment puts black backlight drive circuit and VR equipment on the skin |
-
2016
- 2016-03-31 CN CN201620266541.3U patent/CN205566737U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105636280A (en) * | 2016-03-31 | 2016-06-01 | 深圳多哚新技术有限责任公司 | Backlight circuit of VR display |
| CN109036294A (en) * | 2018-08-01 | 2018-12-18 | 重庆爱奇艺智能科技有限公司 | Screen for VR equipment puts black backlight drive circuit and VR equipment on the skin |
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