CN102722225A - LCD (liquid crystal display) screen protective device of embedded system - Google Patents
LCD (liquid crystal display) screen protective device of embedded system Download PDFInfo
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- CN102722225A CN102722225A CN2012101983114A CN201210198311A CN102722225A CN 102722225 A CN102722225 A CN 102722225A CN 2012101983114 A CN2012101983114 A CN 2012101983114A CN 201210198311 A CN201210198311 A CN 201210198311A CN 102722225 A CN102722225 A CN 102722225A
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- circuit
- protective device
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- 230000001681 protective effect Effects 0.000 title claims abstract description 17
- 239000004973 liquid crystal related substance Substances 0.000 title abstract 2
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000004134 energy conservation Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000700 radioactive tracer Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention relates to the field of screen protection, in particular to an LCD (liquid crystal display) screen protective device of an embedded system. For the LCD screen protective device of the embedded system, a counter circuit returns to zero when any button is pressed , and the counter circuit automatically counts down to return to zero when no button is pressed, then a circuit output control signal controls an inverter circuit to turn off a power source for LCD backlight tubes. The LCD screen protective device of the embedded system comprises a keyboard, a counter and a display screen. A keyboard scanning chip is arranged below the keyboard and connected with the same via a sensor, a keyboard scanning circuit is arranged in the keyboard scanning chip which is connected with the counter via another sensor, the counter circuit is arranged in the counter and connected with a LCD control circuit control circuit, the inverter circuit is arranged in the LCD control circuit and connected with the power source for the LCD backlight tubes, and the power source for the LCD backlight tubes is connected with the display screen. The LCD screen protective device of the embedded system has the advantages that service life of the LCD is prolonged, an LCD screen is protected, and energy is saved.
Description
Technical field
The present invention relates to the screen protection field, relate in particular to a kind of embedded system lcd screen protective device.
Background technology
The electric integrated parameter prison of portable multi-function record appearance is the new instrument of a kind of integrated wave tracer, portable fault oscillograph, the total starting characteristics test appearance of generator function; The electric integrated parameter prison of portable multi-function record appearance is the embedded system of a long-term on-line operation, adopts the LCD display mode.The backlight lamp tube of LCD is by inverter power supply; Backlight lamp tube is about 20000 hours (about 2.3 years) serviceable life, if there is not screen saver function, then will not reach the designed life of instrument; And the screen saver function of embedded computer module can not be closed backlight lamp tube, causes the waste of the energy.
Summary of the invention
The present invention is directed to the above-mentioned deficiency that prior art exists, novel a kind of embedded system lcd screen protective device is provided, comprise keyboard sum counter circuit; When button was pressed arbitrarily, counter circuit was made zero, when there not being button to press; Counter circuit carries out countdown automatically, and behind the delay time that reaches design, counter circuit also makes zero; At this moment circuit output control signal, the control inverter circuit is closed the power supply of LCD backlight lamp tube.
The objective of the invention is to realize through following technical scheme:
A kind of embedded system lcd screen protective device comprises keyboard, counter, display screen, and said keyboard bottom is provided with the keyboard scan chip; Said keyboard is connected with the keyboard scan chip through sensor; Be provided with keyboard scanning circuit in the said keyboard scan chip, said keyboard scan chip is connected with counter through sensor, is provided with counter circuit in the said counter; Said counter circuit is connected with the LCD control circuit; Be provided with inverter circuit in the said LCD control circuit, said inverter circuit is connected with LCD backlight lamp tube power supply, and said LCD backlight lamp tube power supply is connected with display screen.
The pin of the keyboard scan chip IC 1 of said keyboard bottom constitutes keyboard array; Column signal drags down successively during operation, has key to press, and the signal of then going accordingly can detect low level; Said keyboard scanning circuit comprises 8 input nand gates; Said IC1 is connected with 8 input nand gates, and with when key is pressed, Sheffer stroke gate is output as height.
CY1 and IC3, IC4 constitute 2 grades of counters; The reset terminal of said IC4 connects 8 input nand gate delivery outlets; The clock end of said IC4 is connected with IC3; The Q10 of said IC4, Q11, Q12 are connected to the wire jumper seat, select stand-by time by wire jumper, and said stand-by time is respectively 8 minutes, 17 minutes or 34 minutes; Said IC3 is connected with CY1, does not have button to press and reaches stand-by time, and IC4 is through wire jumper output high level, and control Q01 through optocoupler output LCD shutdown signal backlight, gets into the screen protection state; Control Q02 simultaneously and open the screen protection indication LED; Button is pressed, and then IC4 is reset, and counter makes zero, and through the wire jumper output low level, LCD is backlight to be opened.
Beneficial effect of the present invention: simple in structure, easy to use, cost of manufacture is low; Increased the serviceable life of LCD; Circuit arrangement has played lcd screen protection and energy-conservation effect, and the backlight lamp tube in the electric integrated parameter prison of the portable multi-function record appearance is increased serviceable life.
Description of drawings
Fig. 1 is an embedded system lcd screen protective device structural representation of the present invention.
Fig. 2 is an embedded system lcd screen protective device keyboard scanning circuit of the present invention.
Fig. 3 is embedded system lcd screen protective device counter of the present invention and LCD control circuit.
Embodiment
According to accompanying drawing and embodiment the present invention is done further explain below:
Like Fig. 1, Fig. 2, shown in Figure 3; A kind of embedded system lcd screen protective device of the present invention comprises keyboard, counter, display screen, and said keyboard bottom is provided with the keyboard scan chip; The pin of keyboard scan chip IC 1 has constituted keyboard array; Column signal drags down successively during operation, if there is key to press, the signal of then going accordingly can detect low level.This circuit uses one 8 input nand gate, and said IC1 is connected with 8 input nand gates, and when key was pressed, Sheffer stroke gate was output as height.Said keyboard is connected with the keyboard scan chip through sensor; Be provided with keyboard scanning circuit in the said keyboard scan chip, said keyboard scan chip is connected with counter through sensor, is provided with counter circuit in the said counter; Said counter circuit is connected with the LCD control circuit; Be provided with inverter circuit in the said LCD control circuit, said inverter circuit is connected with LCD backlight lamp tube power supply, and said LCD backlight lamp tube power supply is connected with display screen.When inverter circuit received the signal that the LCD control circuit sends, control LCD backlight lamp tube power supply was closed fluorescent tube, and display screen gets into the screen protection state, accomplished energy-conservation and protection screen, the purpose that instrument is increased service time.
CY1 among Fig. 3 and IC3, IC4 constitute 2 grades of counters, and the reset terminal of IC4 connects 8 input nand gate delivery outlets, and when button is pressed, this counter will be reset, and the clock end of said IC4 is connected with IC3.Select the screen protection stand-by time for ease, the Q10 of IC4, Q11, Q12 are connected to the wire jumper seat, select stand-by time by wire jumper, are respectively 8 minutes, 17 minutes or 34 minutes.Said IC3 is connected with CY1, if do not have button to press and reach stand-by time, then IC4 is through wire jumper output high level, and control Q01 through optocoupler output LCD shutdown signal backlight, gets into the screen protection state; Control Q02 simultaneously and open the screen protection indication LED.Press if any button, then IC4 is reset, and counter makes zero, and through the wire jumper output low level, LCD is backlight to be opened.
The electric integrated parameter prison of portable multi-function record appearance is the embedded system of a long-term on-line operation, adopts the LCD display mode.The backlight lamp tube of LCD is by inverter power supply, and backlight lamp tube is about 20000 hours (about 2.3 years) serviceable life, if there is not screen saver function, then will not reach the designed life of instrument in serviceable life of LCD.The screen saver function of embedded computer module can not be closed backlight lamp tube.This programme has designed a kind of embedded system lcd screen protective device, after using instrument, because not at needs display screen data presented and figure; At this moment, the user can press key on any keyboard, the key period of the day from 11 p.m. to 1 a.m on user's keypad; To start the keyboard scan chip through sensor, and make keyboard scanning circuit signal to sensor, sensor signals to the LCD control circuit again; Inverter circuit in the LCD control circuit sends instruction with LCD backlight lamp tube power-off, makes display screen be in the blank screen state, saves electric power; If the user does not press lower keyboard timely, the counter circuit in the counter also will carry out the countdown counting automatically, when timing is made zero; Repeat above-mentioned operation, also can reach purpose the display screen blank screen.The present invention program has played lcd screen protection and energy-conservation effect, and the backlight lamp tube in the electric integrated parameter prison of the portable multi-function record appearance is increased serviceable life.
Claims (3)
1. embedded system lcd screen protective device, it is characterized in that: comprise keyboard, counter, display screen, said keyboard bottom is provided with the keyboard scan chip; Said keyboard is connected with the keyboard scan chip through sensor; Be provided with keyboard scanning circuit in the said keyboard scan chip, said keyboard scan chip is connected with counter through sensor, is provided with counter circuit in the said counter; Said counter circuit is connected with the LCD control circuit; Be provided with inverter circuit in the said LCD control circuit, said inverter circuit is connected with LCD backlight lamp tube power supply, and said LCD backlight lamp tube power supply is connected with display screen.
2. a kind of embedded system lcd screen protective device as claimed in claim 1 is characterized in that: the pin of the keyboard scan chip IC 1 of said keyboard bottom constitutes keyboard array, and column signal drags down successively during operation; There is key to press; The signal of then going accordingly can detect low level, and said keyboard scanning circuit comprises 8 input nand gates, and said IC1 is connected with 8 input nand gates; When key was pressed, Sheffer stroke gate was output as height.
3. a kind of embedded system lcd screen protective device as claimed in claim 1; It is characterized in that: CY1 and IC3, IC4 constitute 2 grades of counters; The reset terminal of said IC4 connects 8 input nand gate delivery outlets, and the clock end of said IC4 is connected with IC3, and the Q10 of said IC4, Q11, Q12 are connected to the wire jumper seat; Select stand-by time by wire jumper, said stand-by time is respectively 8 minutes, 17 minutes or 34 minutes; Said IC3 is connected with CY1, does not have button to press and reaches stand-by time, and IC4 is through wire jumper output high level, and control Q01 through optocoupler output LCD shutdown signal backlight, gets into the screen protection state; Control Q02 simultaneously and open the screen protection indication LED; Button is pressed, and then IC4 is reset, and counter makes zero, and through the wire jumper output low level, LCD is backlight to be opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101983114A CN102722225A (en) | 2012-06-16 | 2012-06-16 | LCD (liquid crystal display) screen protective device of embedded system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101983114A CN102722225A (en) | 2012-06-16 | 2012-06-16 | LCD (liquid crystal display) screen protective device of embedded system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102722225A true CN102722225A (en) | 2012-10-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101983114A Pending CN102722225A (en) | 2012-06-16 | 2012-06-16 | LCD (liquid crystal display) screen protective device of embedded system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105242767A (en) * | 2015-09-29 | 2016-01-13 | 努比亚技术有限公司 | Power-saving method and terminal device |
Citations (4)
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|---|---|---|---|---|
| CN101441860A (en) * | 2008-12-22 | 2009-05-27 | 三一重工股份有限公司 | Control device for starting LCD power supply |
| CN102075652A (en) * | 2009-11-05 | 2011-05-25 | 夏普株式会社 | Information equipment and image forming apparatus effectively displaying specific information |
| US20110249200A1 (en) * | 2010-04-09 | 2011-10-13 | Seiko Epson Corporation | Reflection-type screen, projection system, front projection television system, and reflection-type screen manufacturing method |
| CN202677797U (en) * | 2012-06-16 | 2013-01-16 | 哈尔滨物格电子技术有限公司 | LCD screen protection device of embedded system |
-
2012
- 2012-06-16 CN CN2012101983114A patent/CN102722225A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101441860A (en) * | 2008-12-22 | 2009-05-27 | 三一重工股份有限公司 | Control device for starting LCD power supply |
| CN102075652A (en) * | 2009-11-05 | 2011-05-25 | 夏普株式会社 | Information equipment and image forming apparatus effectively displaying specific information |
| US20110249200A1 (en) * | 2010-04-09 | 2011-10-13 | Seiko Epson Corporation | Reflection-type screen, projection system, front projection television system, and reflection-type screen manufacturing method |
| CN202677797U (en) * | 2012-06-16 | 2013-01-16 | 哈尔滨物格电子技术有限公司 | LCD screen protection device of embedded system |
Non-Patent Citations (2)
| Title |
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| 张斌，肖建，浦汉来: "《一种手持嵌入设备的系统级功耗管理方案》", 《电子器件》 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105242767A (en) * | 2015-09-29 | 2016-01-13 | 努比亚技术有限公司 | Power-saving method and terminal device |
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Application publication date: 20121010 |
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