CN2745164Y - Circuit for suppressing scrambling screen display of LCD screen - Google Patents
Circuit for suppressing scrambling screen display of LCD screen Download PDFInfo
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- CN2745164Y CN2745164Y CN 200420061478 CN200420061478U CN2745164Y CN 2745164 Y CN2745164 Y CN 2745164Y CN 200420061478 CN200420061478 CN 200420061478 CN 200420061478 U CN200420061478 U CN 200420061478U CN 2745164 Y CN2745164 Y CN 2745164Y
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Abstract
The utility model relates to the image display technology, in particular to an LCD device. The technical proposal of the utility model is that a circuit for suppressing scrambling screen display of LCD screen comprises a backlight driving circuit which is connected with a backlight driving signal through a delay circuit composed of a resistance and a capacitance. The advantages of the utility model which can be widely applied to the fields of LCD device, LCD television, etc. are as follows: simple circuit structure, reliable working, and low cost.
Description
Technical field
The utility model relates to image display technology, particularly LCD.
Background technology
The digital flat panel display device is different from general CRT kinescope on shows signal mechanism, do not have sweep circuit.With the LCDs is example, and liquid crystal molecule (pixel) is under the effect of driving electric field, and ordered state changes, and makes by the light of LCDs modulatedly, and presents bright, dark display effect.Light by LCDs is produced by backlight, and driving electric field then is to be controlled by R, G, the phase place of B signal, amplitude, frequency after the sampling.The backlight driving signal of MCU output, the control backlight source driving circuit is lighted backlight, displayed image.
The demonstration of LCDs is to be controlled by the display controller of total system.Display controller belongs to Computer I/O opertaing device, is controlled by MCU.This display controller has complete sequential control circuit and powerful steering order collection, and is controlled by MCU by the I/O mouth.It mainly is divided into interface, control and output three parts.Power on and moment (switching on and shutting down moment) of power down in digital display circuit, MCU does not also finish and resets, and the I/O signal of interface section can not reach requirement in moment so, and the I/O mouth output signal of control section all mistake may occur in sequential, amplitude, the frequency of moment.Around here, backlight control signal, the address to the display buffer, the management of data, the control of read-write also just can not be controlled in moment.The output signal of display controller is in rambling state, if this moment, backlight was lighted, will occur " flower screen " phenomenon on the screen, and promptly irregular motley vertical line charting picture has had a strong impact on the quality of display effect and product.
For eliminating flower screen phenomenon, effectively control display timing generator, prior art normally increases sequential control IC or increases small-sized microprocessor in addition to be controlled.Adopt the cost of this mode higher, system design has been increased unreliability.
The utility model content
Technical problem to be solved in the utility model is exactly the above-mentioned shortcoming at prior art, provides a kind of employing ball bearing made using to realize that sequential is synchronous, eliminates the technology of LCDs flower screen phenomenon.
The utility model solves its technical matters, and the technical scheme of employing is that LCDs flower screen suppresses circuit, comprises the backlight source driving circuit that is connected with backlight driving signal; It is characterized in that: described backlight driving signal is connected with backlight source driving circuit by delay circuit.
The beneficial effects of the utility model are, circuit structure is simple, and reliable operation is with low cost.
Description of drawings
Fig. 1 is a circuit structure block diagram of the present utility model;
Fig. 2 is the circuit diagram of embodiment 1;
Fig. 3 is the circuit diagram of embodiment 2;
Fig. 4 is the circuit diagram of embodiment 3;
Fig. 5, Fig. 6 are the circuit diagrams of embodiment 4;
Fig. 7 is the circuit diagram of embodiment 5.
Embodiment
Below in conjunction with drawings and Examples, describe the technical solution of the utility model in detail.
The technical solution of the utility model is, increases delay circuit between backlight driving signal and backlight source driving circuit, and backlight driving signal is carried out delay process, makes backlight and display driver circuit sequential synchronous.Promptly when display driver circuit sequential normal synchronized, it is luminous to drive backlight.Delay circuit of the present utility model can by changing the parameter of delay circuit, change time delay very easily according to different display controllers, thereby eliminates flower screen phenomenon fully.Circuit structure is referring to Fig. 1.
Embodiment 1
This example is with resistance R 1, and capacitor C 1 constitutes delay circuit.Circuit structure is seen Fig. 2.
When start powered on moment, display driver circuit sequential were not synchronous as yet, the backlight driving signal of MCU output was by 1 charging of 1 pair of capacitor C of resistance R.Charging rate τ=R1 * C1, adjust the value of R1, C1, can change the size of charging rate, promptly change time delay, when display driver circuit sequential normal synchronized, the voltage on the capacitor C 1 reaches the backlight source driving circuit threshold voltage, the backlight source driving circuit action, backlight is luminous, the screen display image.During the display operate as normal, capacitor C 1 charging reaches stable state, and delay circuit does not have influence to backlight source driving circuit.This example suppresses circuit for (start) flower screen that powers on.
Embodiment 2
In order to increase power down (shutdown) flower screen inhibit feature, this routine circuit has increased a discharge diode VD3 on the basis of embodiment 1 circuit.The positive pole of diode VD3 is connected with capacitor C 1, and negative pole is connected with drive signal plate power Vcc.During shutdown, the electric charge that stores on the capacitor C 1, by diode VD3 and the rapid discharge of power Vcc branch road, backlight source driving circuit ends immediately, turn-offs backlight, thereby eliminates shutdown flower screen phenomenon.Simultaneously, diode VD3 also has clamping action, with the drive signal clamper below the Vcc+0.7V level.Circuit structure is seen Fig. 3.
Embodiment 3
When preventing capacitor C 1 discharge, negative-phase sequence curent can insert isolating diode VD2 to the influence of source driving signal integrated circuit between resistance R 1 and drive signal.The positive pole of VD2 connects drive signal, and negative pole is connected with resistance R 1.Circuit structure is referring to Fig. 4.
Embodiment 4
Isolating diode also can be connected on the charge and discharge path of capacitor C 1.Circuit structure is seen Fig. 5.VD1 among the figure is isolating diode.The positive pole of VD1 connects backlight source driving circuit, and negative pole is connected with capacitor C 1.VD1 has isolated source driving signal and driving circuit simultaneously.Certainly, existing diode VD1 has diode VD2 also to be fine again in the circuit, sees Fig. 6.
Embodiment 5
For the circuit shown in the embodiment 4, parallel resistance R2 on discharge diode VD3 can improve the speed that discharges and recharges of capacitor C 1.Improve the response time of circuit.The typical circuit structure is seen Fig. 7.
The foregoing description all triggers the backlight source driving circuit design at high level.Trigger backlight source driving circuit for low level, can be with increasing a phase inverter or the diode VD1 in the foregoing circuit, VD2 reversal connection being constituted.This variation belongs to conventional and changes, and does not give unnecessary details for this reason.
The utility model constitutes delay circuit with simple resistance-capacitance circuit, has eliminated the flower screen phenomenon of LCDs, and it is simple to have a circuit structure, and cost is low, high reliability features.Can be widely used in fields such as LCD, LCD TV.
Claims (8)
1. LCDs flower screen suppresses circuit, comprises the backlight source driving circuit that is connected with backlight driving signal; It is characterized in that: described backlight driving signal is connected with backlight source driving circuit by delay circuit.
2. LCDs flower screen according to claim 1 suppresses circuit, and it is characterized in that: described delay circuit is by resistance (R1), and electric capacity (C1) constitutes; Described resistance (R1) end is connected with backlight driving signal, and the other end is connected with backlight source driving circuit; Described electric capacity (C1) termination backlight source driving circuit, an end ground connection.
3. LCDs flower screen according to claim 2 suppresses circuit, and it is characterized in that: described delay circuit also comprises diode (VD3); Described diode (VD3) positive pole connects electric capacity (C1), and negative pole connects power supply.
4. suppress circuit according to claim 2 or 3 described LCDs flower screens, it is characterized in that: described resistance (R1) is connected with backlight driving signal by diode (VD2); Described diode (VD2) positive pole connects backlight driving signal, negative pole connecting resistance (R1).
5. LCDs flower screen according to claim 4 suppresses circuit, and it is characterized in that: described electric capacity (C1) connects backlight source driving circuit by diode (VD1); Described diode (VD1) positive pole connects backlight source driving circuit, and negative pole connects electric capacity (C1).
6. LCDs flower screen according to claim 5 suppresses circuit, and it is characterized in that: described diode (VD3) is in parallel with resistance (R2).
7. suppress circuit according to claim 2 or 3 described LCDs flower screens, it is characterized in that: described electric capacity (C1) connects backlight source driving circuit by diode (VD1); Described diode (VD1) positive pole connects backlight source driving circuit, and negative pole connects electric capacity (C1).
8. LCDs flower screen according to claim 7 suppresses circuit, and it is characterized in that: described diode (VD3) is in parallel with resistance (R2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420061478 CN2745164Y (en) | 2004-09-30 | 2004-09-30 | Circuit for suppressing scrambling screen display of LCD screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420061478 CN2745164Y (en) | 2004-09-30 | 2004-09-30 | Circuit for suppressing scrambling screen display of LCD screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2745164Y true CN2745164Y (en) | 2005-12-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420061478 Expired - Fee Related CN2745164Y (en) | 2004-09-30 | 2004-09-30 | Circuit for suppressing scrambling screen display of LCD screen |
Country Status (1)
| Country | Link |
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| CN (1) | CN2745164Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103033339A (en) * | 2012-12-14 | 2013-04-10 | 京东方科技集团股份有限公司 | Lighting jig |
| CN103927993A (en) * | 2013-12-18 | 2014-07-16 | 上海中航光电子有限公司 | Display screen backlight control circuit and method and display device |
| CN108447454A (en) * | 2018-02-23 | 2018-08-24 | 广州视源电子科技股份有限公司 | A kind of display screen sequential control method, device, terminal device and storage medium |
| CN109410859A (en) * | 2018-11-21 | 2019-03-01 | 惠科股份有限公司 | A kind of display device and driving method and display |
-
2004
- 2004-09-30 CN CN 200420061478 patent/CN2745164Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103033339A (en) * | 2012-12-14 | 2013-04-10 | 京东方科技集团股份有限公司 | Lighting jig |
| CN103033339B (en) * | 2012-12-14 | 2015-07-01 | 京东方科技集团股份有限公司 | Lighting jig |
| US9778322B2 (en) | 2012-12-14 | 2017-10-03 | Boe Technology Group Co., Ltd. | Lighting jig |
| CN103927993A (en) * | 2013-12-18 | 2014-07-16 | 上海中航光电子有限公司 | Display screen backlight control circuit and method and display device |
| CN103927993B (en) * | 2013-12-18 | 2016-04-27 | 上海中航光电子有限公司 | Display backlight control circuit, method and display device |
| CN108447454A (en) * | 2018-02-23 | 2018-08-24 | 广州视源电子科技股份有限公司 | A kind of display screen sequential control method, device, terminal device and storage medium |
| CN109410859A (en) * | 2018-11-21 | 2019-03-01 | 惠科股份有限公司 | A kind of display device and driving method and display |
| US11308911B2 (en) | 2018-11-21 | 2022-04-19 | HKC Corporation Limited | Display device, driving method, and display system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20051207 Termination date: 20130930 |