CN101673516B - Liquid crystal screen contrast adjustment circuit for monitoring equipment - Google Patents
Liquid crystal screen contrast adjustment circuit for monitoring equipment Download PDFInfo
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- CN101673516B CN101673516B CN2008100426545A CN200810042654A CN101673516B CN 101673516 B CN101673516 B CN 101673516B CN 2008100426545 A CN2008100426545 A CN 2008100426545A CN 200810042654 A CN200810042654 A CN 200810042654A CN 101673516 B CN101673516 B CN 101673516B
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- contrast adjustment
- liquid crystal
- exclusion
- driver module
- module
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Abstract
The invention discloses a liquid crystal screen contrast adjustment circuit for monitoring equipment, relates to the technical field of liquid crystal display, and aims to solve the technical problem of inconvenient adjustment of the contrast of a liquid crystal screen of the prior monitoring equipment. The circuit comprises a display driving module, and is characterized in that: the circuit also comprises a key scanning circuit for inputting a contrast adjustment value, a key driving module of which the input end is connected with the key scanning circuit, a data latching module used for generating a reference adjustable circuit, and a triode, wherein an enable end of the data latching module is always effective, a control end is connected with a system control signal, an input end is connected with a data output end of the key driving module, an output end is connected with an exclusion, and a public end of the exclusion is serially connected with a resistor and then earthed; and a base electrode of the triode is connected with the public end of the exclusion, an emitting electrode is serially connected with a pull-up resistor, a collector electrode is connected with a display screen contrast adjustment end of the display driving module, and the resistor is connected with a display screen voltage output end of the display driving module. The circuit provided by the invention cannot influence normal operation of the equipment in the adjusting process.
Description
Technical field
The present invention relates to lcd technology, particularly relate to a kind of technology that is used for the liquid crystal display contrast adjustment circuit of watch-dog.
Background technology
In electric system; The human-computer interface system of various watch-dogs provides easy close friend's inquiry service function to the user; The user only need can get into menu through keyboard operation and inquire about various semaphores or control its operation, and through liquid crystal display its operating process and operating result is fed back to the user.Traditional watch-dog all adopts the manual adjustment potentiometer to regulate the contrast of liquid crystal display when producing, and makes it reach the best image state, regulates efficient and quality and under the situation of equipment volume production, be difficult to improve it; And various use occasion environment are different; Equipment is difficult to the contrast of its liquid crystal display of assurance and can drift about in operational process; This moment be if will need open cabinet to its adjusting, and needs the professional to regulate, and regulates extremely inconvenience; Careless slightly meeting has a strong impact on the normal operation of equipment, and production brings serious hidden danger to enterprise security.
Summary of the invention
To the defective that exists in the above-mentioned prior art; Technical matters to be solved by this invention provides a kind of contrast that can use the button on the watch-dog to regulate liquid crystal display; And also can not influence equipment when regulating and normally move, regulate liquid crystal display contrast adjustment circuit very easily.
In order to solve the problems of the technologies described above, a kind of liquid crystal display contrast adjustment circuit that is used for watch-dog provided by the present invention comprises driver module, it is characterized in that, also comprises:
The key scan loop is used to import the contrast adjustment value;
The button driver module, its input end connects the key scan loop;
The data latching module is used to produce adjustable reference voltage, its Enable Pin continuously effective, and control end welding system control signal, input end connects the data output end of button driver module, and output terminal connects an exclusion, ground connection behind the common port series resistor of exclusion;
Triode, its base stage connects the common port of exclusion, the emitter pull-up resistor of connecting, collector connects the display screen contrast adjustment end of driver module, and connects the screen voltage output terminal of driver module through resistance.
Further, said data latching module is for producing the data latching module of 9 grades of adjustable reference voltages.
Further, the display screen contrast adjustment end of said driver module parallel connection one decoupling capacitance carries out filtering.
The liquid crystal display contrast adjustment circuit that is used for watch-dog provided by the invention; Can regulate the contrast of liquid crystal display through button,, also need not the professional and regulate so when regulating, need not to open cabinet; And also can not influence equipment when regulating and normally move, it is very convenient to regulate.
Description of drawings
Fig. 1 is driver module and the circuit diagram of data latching module of the liquid crystal display contrast adjustment circuit that is used for watch-dog of the embodiment of the invention;
Fig. 2 is key scan loop and the circuit diagram of button driver module of the liquid crystal display contrast adjustment circuit that is used for watch-dog of the embodiment of the invention.
Embodiment
Below in conjunction with description of drawings embodiments of the invention are described in further detail, but present embodiment is not limited to the present invention, every employing analog structure of the present invention and similar variation thereof all should be listed protection scope of the present invention in.
Like Fig. 1-shown in Figure 2, a kind of liquid crystal display contrast adjustment circuit that is used for watch-dog that the embodiment of the invention provided comprises driver module P3, it is characterized in that, also comprises:
The key scan loop comprises button K1-K8, is used to import the contrast adjustment value;
Button driver module U1, its input end A0-A7 (2 pin-9 pin) connects the key scan loop through exclusion RP1;
Data latching module U7; Be used to produce adjustable reference voltage; Its Enable Pin OC continuously effective (1 pin ground connection), control end C (11 pin) welding system control signal CS7 (being used to latch control), input end 1D-8D (2 pin-9 pin) connects the data output end B0-B7 (11 pin-18 pin) of load module U1; Output terminal 1Q-8Q (12 pin-19 pin) connects an exclusion RP5, ground connection behind the common port series resistor R6 of exclusion RP5;
One triode Q1; Its base stage connects the common port of exclusion RP5; The emitter pull-up resistor R7 that connects, collector meets the display screen contrast adjustment end V0 (3 pin) of driver module P3, and connects the screen voltage output terminal VOUT (20 pin) of driver module P3 through resistance R 8.
The adjustable reference voltage that said data latching module U7 is produced has 9 grades, shows that the voltage on the triode Q1 base stage is 9 volts of 5 * (8-x) ÷, wherein x=0,1,2...8.
The display screen contrast adjustment end V0 parallel connection one decoupling capacitance C5 of said driver module P3 carries out filtering.
When regulating lcd contrast; Constantly change the benchmark digital signal (increasing or decreasing) of input through button K1-K8; Digital signal is sent to data latching module U7 after button driver module U1 handles; Data latching module U7 produces reference voltage according to the data that sent, and through changing the emitter junction voltage of triode Q1 with its pin and the exclusion RP5 that connects and the resistance R 6 that is connected in series, it acts on triode Q1 and goes up the back and produce output current; Through after resistance R 8 dividing potential drops, end reaction is on the display screen contrast adjustment end V0 of driver module P3 again.
When transferring to optimum contrast, the input that stops key, this moment, this group benchmark digital signal promptly was stored in the system, and when switching on next time, this reference signal is directly transferred from system, makes the contrast of adjusting can not be changed.
According to the different pieces of information that button K1-K8 is imported, the exportable 9 grades of reference voltages of data latching module U7, the liquid crystal optimum contrast should be in the position, middle of 9 grades of adjustable voltages when doing material certainly.
Claims (3)
1. a liquid crystal display contrast adjustment circuit that is used for watch-dog comprises driver module, it is characterized in that, also comprises:
The key scan loop is used to import the contrast adjustment value;
The button driver module, its input end connects the key scan loop;
The data latching module is used to produce adjustable reference voltage, its Enable Pin continuously effective, and control end welding system control signal, input end connects the data output end of button driver module, and output terminal connects an exclusion, ground connection behind the common port series resistor of exclusion;
Triode, its base stage connects the common port of exclusion, the emitter pull-up resistor of connecting, collector connects the display screen contrast adjustment end of driver module, and connects the screen voltage output terminal of driver module through resistance.
2. the liquid crystal display contrast adjustment circuit that is used for watch-dog according to claim 1 is characterized in that: said data latching module is for producing the data latching module of 9 grades of adjustable reference voltages.
3. the liquid crystal display contrast adjustment circuit that is used for watch-dog according to claim 1 is characterized in that: display screen contrast adjustment end parallel connection one decoupling capacitance of said driver module carries out filtering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100426545A CN101673516B (en) | 2008-09-09 | 2008-09-09 | Liquid crystal screen contrast adjustment circuit for monitoring equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100426545A CN101673516B (en) | 2008-09-09 | 2008-09-09 | Liquid crystal screen contrast adjustment circuit for monitoring equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101673516A CN101673516A (en) | 2010-03-17 |
| CN101673516B true CN101673516B (en) | 2012-06-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100426545A Expired - Fee Related CN101673516B (en) | 2008-09-09 | 2008-09-09 | Liquid crystal screen contrast adjustment circuit for monitoring equipment |
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| Country | Link |
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| CN (1) | CN101673516B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112242128A (en) * | 2020-10-16 | 2021-01-19 | 临沂安迪电气有限公司 | Method for adjusting LCD contrast by key |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5029982A (en) * | 1989-09-11 | 1991-07-09 | Tandy Corporation | LCD contrast adjustment system |
| CN2627612Y (en) * | 2003-05-20 | 2004-07-21 | 深圳市珊星电脑有限公司 | Equipment for regulating LCD contrast |
| CN2757279Y (en) * | 2004-11-30 | 2006-02-08 | 比亚迪股份有限公司 | Once programmable operation device for liquid crystal display module driving chip |
| CN101090593A (en) * | 2006-06-13 | 2007-12-19 | 天利半导体（深圳）有限公司 | High performance current contrast adjustable control circuit |
| CN201247578Y (en) * | 2008-09-03 | 2009-05-27 | 上海申瑞电力科技股份有限公司 | Circuit for Regulating liquid crystal screen contrast of monitoring device |
-
2008
- 2008-09-09 CN CN2008100426545A patent/CN101673516B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5029982A (en) * | 1989-09-11 | 1991-07-09 | Tandy Corporation | LCD contrast adjustment system |
| CN2627612Y (en) * | 2003-05-20 | 2004-07-21 | 深圳市珊星电脑有限公司 | Equipment for regulating LCD contrast |
| CN2757279Y (en) * | 2004-11-30 | 2006-02-08 | 比亚迪股份有限公司 | Once programmable operation device for liquid crystal display module driving chip |
| CN101090593A (en) * | 2006-06-13 | 2007-12-19 | 天利半导体（深圳）有限公司 | High performance current contrast adjustable control circuit |
| CN201247578Y (en) * | 2008-09-03 | 2009-05-27 | 上海申瑞电力科技股份有限公司 | Circuit for Regulating liquid crystal screen contrast of monitoring device |
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| Publication number | Publication date |
|---|---|
| CN101673516A (en) | 2010-03-17 |
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Owner name: SHANGHAI SUNRISE PROTECTIVE RELAY ELECTRIC CO.,LTD Free format text: FORMER OWNER: SHANGHAI SUNRISE POWER AUTOMATION CO., LTD. Effective date: 20130227 |
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Effective date of registration: 20130227 Address after: 200233 Guiping Road, Xuhui District, No. 470, building 12, building 5, building Patentee after: Shanghai Sunrise Power Technology Co., Ltd. Address before: 200233 Shanghai City, Xuhui District Road No. 159 15 Tianzhou room unit 1301 Patentee before: Shanghai Sunrise Power Automation Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120627 Termination date: 20170909 |
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| CF01 | Termination of patent right due to non-payment of annual fee |