CN201594376U - Liquid crystal backlight automatic adjusting device for fire alarming controller - Google Patents
Liquid crystal backlight automatic adjusting device for fire alarming controller Download PDFInfo
- Publication number
- CN201594376U CN201594376U CN2009201805267U CN200920180526U CN201594376U CN 201594376 U CN201594376 U CN 201594376U CN 2009201805267 U CN2009201805267 U CN 2009201805267U CN 200920180526 U CN200920180526 U CN 200920180526U CN 201594376 U CN201594376 U CN 201594376U
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- liquid crystal
- chip machine
- single chip
- signal
- crystal backlight
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Abstract
The utility model discloses a liquid crystal backlight automatic adjusting device for a fire alarming controller, which comprises a single chip machine, wherein an AD collecting port of the single chip machine is connected to a signal generating and adjusting circuit; a time output port of the single chip machine is connected to a liquid crystal socket. The signal generating and adjusting circuit is characterized in that a photoresistor R20 is connected with a resistor R19 in parallel, and then is divided into three paths; the first path is grounded through a resistor R18; the second path passes through a capacitor C1; and the third path is the output end, and connected to the single chip machine. The utility model adopts the photoresistor to sense the change of the environment light, uses a high-speed AD converter of the single chip machine to collect the change of signals, adopts the filtering algorithm of multiple averaging to prevent signal fluctuation, and finally adopts the pulse width modulator (PWM) function of the signal chip machine. According to the signal collected by the measures, the liquid crystal backlight is controlled. As the measures are taken, the utility model effectively solves the automatic control on the liquid crystal backlight, enables the operator to have comfortable visual feeling, and achieves the purpose of energy saving.
Description
Technical field:
The utility model relates to fire alarm and fire-fighting link apparatus field, is used for the LCD backlight self-checking device of fire alarm control unit specifically.
Background technology:
It is main display device that present fire alarm control unit generally adopts liquid crystal, the brightness of liquid crystal can not be regulated, be merely able to open liquid crystal or close liquid crystal, liquid crystal can be clearly seen clearly when guaranteeing that by day light is strong, more intense backlight illumination must be adopted, yet at night, surround lighting is more weak, if still adopt more intense backlight illumination just dazzling especially, when the operator operates, have uncomfortable feeling before liquid crystal.
Summary of the invention:
The purpose of this utility model provides the LCD backlight auto-adjusting circuit, can solve to regulate liquid crystal backlight lighteness automatically under varying environment light, makes operator's visual experience more comfortable, reaches purpose of energy saving simultaneously.
The technical solution adopted in the utility model is as follows:
The LCD backlight self-checking device that is used for fire alarm control unit comprises a single-chip microcomputer, and the AD acquisition port of single-chip microcomputer is connected to signal and produces and regulating circuit, and the clock delivery outlet of single-chip microcomputer is connected to the liquid crystal socket.
Described signal produces and regulating circuit, after to be photoresistance R20 in parallel with resistance R 19, is divided into three the tunnel, and the first via is by resistance R 18 ground connection, and the second the tunnel passes through capacitor C 1, and Third Road is an output terminal, is connected to single-chip microcomputer.
Advantage of the present utility model is:
The utility model adopts the variation of photoresistance perception surround lighting, adopt the variation of the high-speed A/D converter acquired signal of single-chip microcomputer again, and the filtering algorithm of employing multiple averaging is in order to prevent signal fluctuation, adopt PWM (pulse width modulator) function of single-chip microcomputer at last, according to the signal that above-mentioned measure is gathered, realize control to LCD backlight.The utility model makes operator's visual experience more comfortable because the enforcement of above-mentioned measure efficiently solves the automatic control to LCD backlight, reaches purpose of energy saving simultaneously.
Description of drawings:
Fig. 1 is circuit theory diagrams of the present utility model;
Embodiment:
Below in conjunction with accompanying drawing the utility model is done detailed description:
Referring to Fig. 1:
The LCD backlight self-checking device that is used for fire alarm control unit comprises a single-chip microcomputer D1, and the AD acquisition port of single-chip microcomputer D1 is connected to signal and produces and regulating circuit, and the clock delivery outlet of single-chip microcomputer D1 is connected to liquid crystal socket X1.
Described signal produces and regulating circuit, after to be photoresistance R20 in parallel with resistance R 19, is divided into three the tunnel, and the first via is by resistance R 18 ground connection, and the second the tunnel passes through capacitor C 1, and Third Road is an output terminal, is connected to single-chip microcomputer.
R20 is photoresistance, and its resistance value reduces with the variation of light, and the R18 that connects with R20 is a divider resistance, when the resistance of R20 changes, can cause the variation of A point voltage, the R19 in parallel with R20 is in order to improve the linearity that concerns between light intensity and the A point voltage.C1 is used for the HFS of filtering acquired signal, and its capacity is enough to the environment light of filtering 50Hz.
D1 is high performance single-chip microcomputer, and its 61st pin is the AD acquisition port, and the AD figure place reaches 10, and the sampling rate cycle, this patent sampling interval was 2 milliseconds less than 10 microseconds, and every collection is calculated a surround lighting 10 times, and its value is the arithmetic mean of 10 samplings.
The 17th pin of D1 is the clock delivery outlet, its output has the multiple way of output, a kind of PWM of being output is wherein arranged, and the cycle of its output signal is fixed, but the pulse width of output can be provided with by software, after software setting is finished, hardware is the fixing pulse of output cycle automatically, at any time, does not need the software intervention, can save the time of single-chip microcomputer, single-chip microcomputer can be vacateed more time and handle other affairs.
X1 is the liquid crystal socket, and this liquid crystal adopts LED-backlit, rather than the CCFL that generally adopts is backlight, has saved inverter, has reduced cost.
Pulse width backlight is directly proportional with brightness, and when surround lighting raise, the lengthened pulse width raise liquid crystal backlight lighteness, and when environmental light intensity reduced, the pulse that narrows down reduced the brightness of liquid crystal.
Claims (2)
1. the LCD backlight self-checking device that is used for fire alarm control unit comprises a single-chip microcomputer, it is characterized in that: the AD acquisition port of single-chip microcomputer is connected to signal and produces and regulating circuit, and the clock delivery outlet of single-chip microcomputer is connected to the liquid crystal socket.
2. the LCD backlight self-checking device that is used for fire alarm control unit according to claim 1, it is characterized in that: described signal produces and regulating circuit, after to be photoresistance R20 in parallel with resistance R 19, be divided into three the tunnel, the first via is by resistance R 18 ground connection, the second the tunnel by capacitor C 1, and Third Road is an output terminal, is connected to single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201805267U CN201594376U (en) | 2009-11-13 | 2009-11-13 | Liquid crystal backlight automatic adjusting device for fire alarming controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201805267U CN201594376U (en) | 2009-11-13 | 2009-11-13 | Liquid crystal backlight automatic adjusting device for fire alarming controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201594376U true CN201594376U (en) | 2010-09-29 |
Family
ID=42776444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201805267U Expired - Lifetime CN201594376U (en) | 2009-11-13 | 2009-11-13 | Liquid crystal backlight automatic adjusting device for fire alarming controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201594376U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103903379A (en) * | 2012-02-27 | 2014-07-02 | 段高峰 | Main board of fire alarm controller |
-
2009
- 2009-11-13 CN CN2009201805267U patent/CN201594376U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103903379A (en) * | 2012-02-27 | 2014-07-02 | 段高峰 | Main board of fire alarm controller |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100929 |