CN201868077U - Stimulating TFT (Thin Film Transistor) display screen driving circuit with display screen-opening delay function - Google Patents
Stimulating TFT (Thin Film Transistor) display screen driving circuit with display screen-opening delay function Download PDFInfo
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- CN201868077U CN201868077U CN2010201085606U CN201020108560U CN201868077U CN 201868077 U CN201868077 U CN 201868077U CN 2010201085606 U CN2010201085606 U CN 2010201085606U CN 201020108560 U CN201020108560 U CN 201020108560U CN 201868077 U CN201868077 U CN 201868077U
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Abstract
The utility model provides a simulating TFT (Thin Film Transistor) display screen driving circuit with display screen-opening delay function, which comprises a driving board power supply circuit and a backlight and backlight-delay circuit, wherein the driving board power supply circuit is used to convert the voltage of the external input power supply into various voltages required by the TFT display screen driving plate, and simultaneously generate the Pulse Width Modulation (PWM) output for the backlight and backlight-delay circuit. The driving circuit is characterized in that the backlight and backlight-delay circuit converts the PWM output into the stable display screen backlight voltage, and is conducted to provide normal display screen backlight voltage after the set delay time. The driving circuit solves the phenomenon that the image is unstable in instantaneous electrifying when the driving circuit stabilizes to operate and establish, and improves the video frequency effect; due to the step-by-step work, the electrifying instantaneous current is decreased, the shock on the power supply is reduced, and more loads can be driven under the same condition.
Description
[technical field]
The utility model relates to a kind of simulation TFT screen drive plate, especially at the indoor set TFT of visible dialogue system centrally connected power supply screen drive plate.
[background technology]
The TFT of video intercom indoor set simulation at present screen drive plate does not all have the on-delay design, so can't avoid TFT screen drive plate video image instability when switching on moment, the characteristics that immediate current is big, not only influence image effect, simultaneously power supply is also impacted, when especially using on the visible dialogue system of centrally connected power supply, can cause Power supply belt loading capability deficiency, the TFT screen shows abnormal situation.
[utility model content]
The technical problems to be solved in the utility model, be to overcome existing technical deficiency, provide a kind of low cost, simple and practical simulation TFT to shield driving circuit, this circuit can solve the unsettled phenomenon of energising moment image, and the reduction of energising momentary current, power surges is diminished.
The utility model is achieved in that a kind of simulation TFT screen driving circuit of spreading its tail and postponing that has, comprise the drive plate power circuit, delay circuit backlight and backlight, described drive plate power circuit connects delay circuit backlight and backlight and is its power supply, it is characterized in that: described delay circuit backlight and backlight, comprise the PWM booster circuit, voltage feedback circuit, constant-current circuit, interface backlight and delay circuit, described PWM booster circuit is connected respectively to voltage feedback circuit, constant-current circuit, interface backlight and delay circuit, described constant-current circuit connects interface backlight and delay circuit respectively, and voltage feedback circuit connects the drive plate power circuit.
Described delay circuit is made up of delay switch pipe Q309, reverse protection diode D308, capacitor C 332, current-limiting resistance R331 and resistance R 330.
The utility model adopts a kind of low cost, simple and practical TFT shields the technical scheme of time-delay power supply backlight, driving delay circuit when TFT powers on starts working, after time-delay a period of time, just give TFT screen backlight power supply (TFT screen electric current is big), can guarantee the demonstration of spreading its tail again after the TFT drive plate operate as normal like this, the existing picture that has solved judder when powered on moment circuit steady operation is set up has promoted video effect, simultaneously because substep work, momentary current reduces so power on, power surges is diminished, therefore under equal conditions can drive more load.In the building conversational system for centrally connected power supply, can effectively reduce interference and serviceable life that transient high-current causes each equipment, reduce the fault that power supply causes.
[description of drawings]
In conjunction with the embodiments the utility model is further described with reference to the accompanying drawings.
Fig. 1 is the system chart of simulation TFT screen driving circuit of the present utility model.
Fig. 2 is the connection layout of the backlight and delay circuit backlight of simulation TFT screen driving circuit of the present utility model.
[embodiment]
See also Fig. 1, a kind of simulation TFT screen driving circuit with the delay of spreading its tail, comprise drive plate power circuit 101, delay circuit 102 backlight and backlight, described delay circuit 102 backlight and backlight, comprise PWM booster circuit, voltage feedback circuit, constant-current circuit, interface backlight and delay circuit 103, when the energising of TFT screen drive plate, the DC/DC work of drive plate power circuit 101, generation+5V ,+15V ,-voltage of 10V offers drive plate, makes the drive plate interlock circuit all enter normal operating conditions; As shown in Figure 2, be the connection layout of the backlight and delay circuit backlight of simulation TFT screen driving circuit of the present utility model, the PWM port is exported to the Q305 of delay circuit 102 backlight and backlight, Q306, Q307 push-pull circuit, generation+15V voltage, through U302, the Q308 constant current is exported as the TFT screen back light source; After the TFT drive plate power supply operate as normal, the output multi-group power is for the each several part circuit working; Though TFT screen internal circuit is all in running order, delay circuit 103 backlight is in the time-delay state, U302, and Q308 is in cut-off state, and TFT is backlight not to work; Described delay circuit is made up of delay switch pipe Q309, reverse protection diode D308, capacitor C 332, current-limiting resistance R331 and resistance R 330, and delay time is approximately: T=3*C322*R330=3*10*10-6*10*103=300ms; When delay circuit delay time backlight then, the Q308 conducting provides normal screen voltage backlight; This moment, the TFT screen can normally be seen image; Its delay time of delay circuit backlight can be adjusted according to system size and customer requirement.
The TFT that the utility model adopted shields the technical scheme of time-delay power supply backlight, the existing picture that has solved judder when powered on moment circuit steady operation is set up has promoted video effect, because substep is worked,, power surges is diminished simultaneously so the momentary current that powers on reduces.In the building conversational system for centrally connected power supply, can effectively reduce interference and serviceable life that transient high-current causes each equipment, reduce the fault that power supply causes.
Claims (2)
1. one kind has the simulation TFT screen driving circuit of spreading its tail and postponing, comprise the drive plate power circuit, delay circuit backlight and backlight, described drive plate power circuit connects delay circuit backlight and backlight and is its power supply, it is characterized in that: described delay circuit backlight and backlight, comprise the PWM booster circuit, voltage feedback circuit, constant-current circuit, interface backlight and delay circuit, described PWM booster circuit is connected respectively to voltage feedback circuit, constant-current circuit, interface backlight and delay circuit, described constant-current circuit connects interface backlight and delay circuit respectively, and voltage feedback circuit connects the drive plate power circuit.
2. the simulation TFT screen driving circuit with the delay of spreading its tail according to claim 1, it is characterized in that: described delay circuit is made up of delay switch pipe Q309, reverse protection diode D308, capacitor C 332, current-limiting resistance R331 and resistance R 330.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201085606U CN201868077U (en) | 2010-02-04 | 2010-02-04 | Stimulating TFT (Thin Film Transistor) display screen driving circuit with display screen-opening delay function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201085606U CN201868077U (en) | 2010-02-04 | 2010-02-04 | Stimulating TFT (Thin Film Transistor) display screen driving circuit with display screen-opening delay function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201868077U true CN201868077U (en) | 2011-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201085606U Expired - Fee Related CN201868077U (en) | 2010-02-04 | 2010-02-04 | Stimulating TFT (Thin Film Transistor) display screen driving circuit with display screen-opening delay function |
Country Status (1)
| Country | Link |
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| CN (1) | CN201868077U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102290030A (en) * | 2011-07-01 | 2011-12-21 | 深圳市华星光电技术有限公司 | LED (Light-Emitting Diode) backlight driving circuit |
| CN103137079A (en) * | 2013-02-03 | 2013-06-05 | 苏州市职业大学 | Constant current driving device of light-emitting diode (LED) backlight module |
| CN106971686A (en) * | 2017-05-25 | 2017-07-21 | 上海中航光电子有限公司 | Display device and its driving method |
| CN107527602A (en) * | 2017-09-30 | 2017-12-29 | 深圳市华星光电半导体显示技术有限公司 | Liquid crystal display panel and switching on and shutting down control circuit |
-
2010
- 2010-02-04 CN CN2010201085606U patent/CN201868077U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102290030A (en) * | 2011-07-01 | 2011-12-21 | 深圳市华星光电技术有限公司 | LED (Light-Emitting Diode) backlight driving circuit |
| CN103137079A (en) * | 2013-02-03 | 2013-06-05 | 苏州市职业大学 | Constant current driving device of light-emitting diode (LED) backlight module |
| CN106971686A (en) * | 2017-05-25 | 2017-07-21 | 上海中航光电子有限公司 | Display device and its driving method |
| CN107527602A (en) * | 2017-09-30 | 2017-12-29 | 深圳市华星光电半导体显示技术有限公司 | Liquid crystal display panel and switching on and shutting down control circuit |
| CN107527602B (en) * | 2017-09-30 | 2019-07-16 | 深圳市华星光电半导体显示技术有限公司 | Liquid crystal display panel and switching on and shutting down control circuit |
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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: 20110615 Termination date: 20130204 |