CN105138168A - Brightness adjusting device for LED touch screen - Google Patents
Brightness adjusting device for LED touch screen Download PDFInfo
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- CN105138168A CN105138168A CN201510529199.1A CN201510529199A CN105138168A CN 105138168 A CN105138168 A CN 105138168A CN 201510529199 A CN201510529199 A CN 201510529199A CN 105138168 A CN105138168 A CN 105138168A
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Abstract
The invention discloses a brightness adjusting device for an LED touch screen. The brightness adjusting device comprises a light sensor, a digital converter, a main controller, a brightness adjusting circuit and a driver. The light sensor is sequentially connected with the digital converter and the main controller. The main controller is connected with the brightness adjusting circuit and the driver. The light sensor is used for detecting light on the surface of the LED touch screen so as to obtain analog signals. The digital converter is used for converting the analog signals into digital signals. The main controller is used for processing the digital signals so as to acquire the intensity value of the light and outputting PWM signals according to the intensity value of the light and the brightness compensation coefficient. The brightness adjusting circuit is used for acquiring the brightness compensation coefficient according to the intensity value of the light. The driver is used for adjusting the brightness of the LED touch screen according to the PWM signals. The brightness adjusting device is simple in structure and convenient to operate, brightness adjusting can be achieved automatically, merely depending on the manual adjusting mode is avoided, and therefore the display function of the touch screen is improved.
Description
Technical field
The present invention relates to a kind of brightness regulating apparatus for LED touch screen, belong to the technical field of LED touch screen.
Background technology
Touch-screen is as a kind of up-to-date computer input apparatus, and it is the simplest, convenient current, natural a kind of man-machine interaction mode.It giving multimedia with brand-new looks, is extremely attractive brand-new multimedia interactive equipment.Be mainly used in the inquiry of public information, leader's office, Industry Control, military commanding, electronic game, choosing song or selecting dish, multimedia teaching, real estate presell etc.
In order to operational convenience, people replace mouse or keyboard with touch-screen.During work, first touch with finger or other object the touch-screen being arranged on display front end, then system carrys out the input of regioselective information according to the icon of finger touch or menu position.Touch-screen is by touching detection part and touch screen controller forms; Touching detection part is arranged on before indicator screen, for detecting user touch location, send touch screen controller after acceptance; And the Main Function of touch screen controller receives touch information from touch point detection device, and convert it to contact coordinate, then give CPU, it can receive order that CPU sends simultaneously and be performed.
Distinguish touch-screen from know-why, five basic kind can be divided into: vector pressure sensing technology touch-screen, resistive technologies touch-screen, capacitance technology touch-screen, infrared technology touch-screen, surface acoustic wave technique touch-screen.Wherein vector pressure sensing technology touch-screen steps down from the stage of history; Infrared technology touch-screen is cheap, but its housing is frangible, easily produces light interference, distortion in curved surface situation; Capacitance technology touch screen design reasonable idea, but its image distortion problems is difficult to be solved at all; The accurate positioning of resistive technologies touch-screen, but its price is quite high, and be afraid of to scrape rapid wear; Surface acoustic wave touch screen solves the various defects of touch-screen in the past, is clearly not easy damaged, is suitable for various occasion, if shortcoming is screen surface have water droplet and dust that touch-screen can be made to become blunt, even do not work.
Although touch-screen development at present, it in use still has problems.As application number: in the file of 201410812134.3 applyings date: 2014-12-23, disclose " a kind of touch-screen.This touch-screen comprises transparent substrates and some electrodes, electrode comprises the first electrode, second electrode and the 3rd electrode, wherein the first electrode unit equidistantly arranges along first direction, second electrode unit equidistantly arranges along first direction, and it is staggered with described first electrode unit, 3rd electrode is in the second direction of described first electrode unit and described second electrode unit, and the 3rd electrode unit equidistantly arranges along first direction, second electrode unit described in first electrode unit and adjacent described in 3rd electrode unit and described in each is coupled formation induction region respectively, described 3rd electrode unit and the 3rd connecting line one_to_one corresponding.The present invention can reduce the quantity of connecting line ".
And at other one section of application number: in the file of 201410522512.4 applyings date: 2014-09-30, disclose " a kind of touch-screen protecgulum and comprise the touch-screen of this touch-screen protecgulum; described touch-screen protecgulum comprises viewing area and non-display area; comprising: first substrate; the upper surface of described first substrate is touch face, and lower surface is the one side of fitting with touch-screen fuselage; Be positioned at the lower surface of described first substrate, and correspond to the light shield layer of described touch-screen protecgulum non-display area, the making material of described light shield layer comprises photochromics.Because photochromics can demonstrate different colors under the illumination of different wave length, thus make the non-display area of the touch-screen protecgulum in the present invention and the touch-screen that comprises this touch-screen protecgulum also can demonstrate corresponding color under the illumination of different wave length, solve the problem that touch-screen color is single, enhance the visual effect of touch-screen ".
Although above-mentioned document makes improvement to touch-screen, it is existing defects still.Existing touch-screen, cannot detection plane surface light and regulating screen intensity according to light conditions, screen intensity can only be carried out according to manual shift, do not possess intellectuality.
Summary of the invention
Technical matters to be solved by this invention is to overcome the deficiencies in the prior art, a kind of brightness regulating apparatus for LED touch screen is provided, solving existing touch-screen cannot detection plane surface light and regulating screen intensity according to light conditions, makes the problem that screen intensity can only be carried out according to manual shift.
The present invention specifically solves the problems of the technologies described above by the following technical solutions:
For a brightness regulating apparatus for LED touch screen, comprising: light sensor, digital quantizer, master controller, brightness regulating circuit, driver, wherein light sensor is connected successively with digital quantizer, master controller; Described master controller is connected respectively with brightness regulating circuit, driver; Described light sensor, obtains simulating signal for the light detecting LED touch screen surfaces; Described digital quantizer, for converting simulating signal to digital signal; Described master controller, for obtaining light intensity value to digital signal processing, and according to light intensity value and luminance compensation coefficient output pwm signal; Described brightness regulating circuit, for obtaining luminance compensation coefficient according to light intensity value; Described driver, for regulating the brightness that LED touch is shielded according to pwm signal.
Further, as a preferred technical solution of the present invention: described driver comprises the first resistance, triode, diode, inductance and the first electric capacity, wherein said pwm signal is connected into the base stage of triode after the first resistance; The input end that the collector of described triode shields with one end of diode, LED touch is connected respectively; The output terminal of described LED touch screen is connected with one end of inductance; The other end of described diode, the other end of inductance connect one end of the first electric capacity respectively; The other end of described first electric capacity and the equal ground connection of emitting stage of triode.
Further, as a preferred technical solution of the present invention: described driver also comprises the second resistance, one end of described second resistance connects the other end of the first electric capacity, the other end ground connection of the second resistance.
Further, as a preferred technical solution of the present invention: described driver also comprises the second electric capacity, one end of described second electric capacity connects diode, and the other end of the second electric capacity connects the first electric capacity.
Further, as a preferred technical solution of the present invention: described device also comprises voltage stabilizer, described voltage stabilizer is connected with brightness regulating circuit.
The present invention adopts technique scheme, can produce following technique effect:
Brightness regulating apparatus for LED touch screen provided by the invention, by setting up automatic detection mechanism on existing touch-screen, light sensor is utilized to detect surperficial light, and obtain light intensity value and generate light compensation coefficient, generate pwm signal on this basis to regulate the brightness that LED touch is shielded, touch-screen can effectively be driven, and brightness can realize automatic adjustment.Structure is simple, easy to operate, robotization can realize brightness regulation, not only relies on manual shift mode, improves the Presentation Function of touch-screen thus.Can solve existing touch-screen cannot detection plane surface light and regulating screen intensity according to light conditions, makes the problem that screen intensity can only be carried out according to manual shift.
Accompanying drawing explanation
Fig. 1 is the module diagram of the brightness regulating apparatus that the present invention is shielded for LED touch.
Fig. 2 is the circuit diagram of driver in the present invention.
Embodiment
Below in conjunction with Figure of description, embodiments of the present invention are described.
As shown in Figure 1, the present invention devises a kind of brightness regulating apparatus for LED touch screen, comprise: light sensor, digital quantizer, master controller, brightness regulating circuit, driver, wherein light sensor is connected successively with digital quantizer, master controller; Described master controller is connected respectively with brightness regulating circuit, driver; Described light sensor, obtains simulating signal for the light detecting LED touch screen surfaces; Described digital quantizer, for converting simulating signal to digital signal; Described master controller, for obtaining light intensity value to digital signal processing, and according to light intensity value and luminance compensation coefficient output pwm signal; Described brightness regulating circuit, for obtaining luminance compensation coefficient according to light intensity value; Described driver, for regulating the brightness that LED touch is shielded according to pwm signal.
Thus, light sensor is utilized to detect surperficial light, and obtain light intensity value and generate light compensation coefficient, generate pwm signal on this basis to regulate the brightness that LED touch is shielded, brightness regulating circuit obtains luminance compensation coefficient when when the value preset below or above it according to light intensity value, luminance compensation coefficient can be negative value or on the occasion of, on this basis, touch-screen can effectively be driven, and brightness can realize automatic adjustment.
Further, the circuit structure of described driver as shown in Figure 2, can comprise the first resistance R1, triode VT, diode VD, inductance L and the first electric capacity C1, and wherein said pwm signal is connected into the base stage of triode VT after the first resistance R1; The input end that the collector of described triode VT shields with one end of diode VD, LED touch is connected respectively; The output terminal of described LED touch screen is connected with one end of inductance L; The other end of described diode VD, the other end of inductance L connect one end of the first electric capacity C1 respectively; The other end of described first electric capacity C1 and the equal ground connection of emitting stage of triode VT.Wherein, in circuit, when inductance L is alived, inductance can produce magnetic field, and namely portion of electrical current converts the mode " storage " of magnetic energy in inductance; When no longer on inductance during galvanization, the mode of magnetic energy by electric current can discharge by inductance in the loop.This is also the reason that on inductance, electric current can not suddenly change, and based on this " discharge and recharge " principle of inductance, it can be used for the discontinuous current produced in the light modulation of mean P WM signal wave.And circuit adopts simple structure, realize the high efficiency drive to LED touch screen.
Further, described driver can also comprise the second resistance R2, and one end of described second resistance R2 connects the other end of the first electric capacity C1, the other end ground connection of the second resistance R2, as shown in Figure 2, adopts the second resistance R2 to realize the effect of shunting dividing potential drop.
And in foregoing circuit, described driver can also comprise the second electric capacity C2, one end of described second electric capacity C2 connects diode VD, and the other end of the second electric capacity C2 connects the first electric capacity C1.It arranges a path for AC signal or pulse signal, avoids AC signal composition because producing pressure drop decay by resistance.
And, described device also comprises can voltage stabilizer, described voltage stabilizer is connected with brightness regulating circuit, it is the feed circuit of adjustment output voltage automatically, effect is stabilized in its range of set value by comparatively large for the fluctuation supply voltage with not reaching electric equipment requirement, and various circuit or electric equipment normally can be worked under rated operational voltage.
To sum up, the brightness regulating apparatus for LED touch screen provided by the invention, structure is simple, easy to operate, robotization can realize brightness regulation, not only relies on manual shift mode, improves the Presentation Function of touch-screen thus.
By reference to the accompanying drawings embodiments of the present invention are explained in detail above, but the present invention is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, can also makes a variety of changes under the prerequisite not departing from present inventive concept.
Claims (5)
1., for a brightness regulating apparatus for LED touch screen, it is characterized in that, comprising: light sensor, digital quantizer, master controller, brightness regulating circuit, driver, wherein light sensor is connected successively with digital quantizer, master controller; Described master controller is connected respectively with brightness regulating circuit, driver; Described light sensor, obtains simulating signal for the light detecting LED touch screen surfaces; Described digital quantizer, for converting simulating signal to digital signal; Described master controller, for obtaining light intensity value to digital signal processing, and according to light intensity value and luminance compensation coefficient output pwm signal; Described brightness regulating circuit, for obtaining luminance compensation coefficient according to light intensity value; Described driver, for regulating the brightness that LED touch is shielded according to pwm signal.
2., according to claim 1 for the brightness regulating apparatus of LED touch screen, it is characterized in that: described driver comprises the first resistance, triode, diode, inductance and the first electric capacity, wherein said pwm signal is connected into the base stage of triode after the first resistance; The input end that the collector of described triode shields with one end of diode, LED touch is connected respectively; The output terminal of described LED touch screen is connected with one end of inductance; The other end of described diode, the other end of inductance connect one end of the first electric capacity respectively; The other end of described first electric capacity and the equal ground connection of emitting stage of triode.
3., according to claim 2 for the brightness regulating apparatus of LED touch screen, it is characterized in that: described driver also comprises the second resistance, one end of described second resistance connects the other end of the first electric capacity, the other end ground connection of the second resistance.
4. according to claim 2 for the brightness regulating apparatus of LED touch screen, it is characterized in that: described driver also comprises the second electric capacity, one end of described second electric capacity connects diode, and the other end of the second electric capacity connects the first electric capacity.
5., according to claim 1 for the brightness regulating apparatus of LED touch screen, it is characterized in that: described device also comprises voltage stabilizer, described voltage stabilizer is connected with brightness regulating circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510529199.1A CN105138168A (en) | 2015-08-26 | 2015-08-26 | Brightness adjusting device for LED touch screen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510529199.1A CN105138168A (en) | 2015-08-26 | 2015-08-26 | Brightness adjusting device for LED touch screen |
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| CN105138168A true CN105138168A (en) | 2015-12-09 |
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| CN201510529199.1A Pending CN105138168A (en) | 2015-08-26 | 2015-08-26 | Brightness adjusting device for LED touch screen |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106875897A (en) * | 2016-12-23 | 2017-06-20 | 惠州市德赛西威汽车电子股份有限公司 | A kind of touch-screen automatic brightness regulation circuit |
| CN109963005A (en) * | 2019-03-28 | 2019-07-02 | 努比亚技术有限公司 | A kind of double screen brightness control system, method and computer storage medium |
| CN118411943A (en) * | 2024-07-02 | 2024-07-30 | 惠科股份有限公司 | Display panel and display device |
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| US20100020108A1 (en) * | 2008-07-28 | 2010-01-28 | Cho Chi-O | Method and apparatus for driving a backlight assembly |
| CN104822209A (en) * | 2015-05-20 | 2015-08-05 | 无锡市崇安区科技创业服务中心 | ZigBee-based intelligent LED streetlamp control system |
| CN204577063U (en) * | 2015-04-17 | 2015-08-19 | 广州炫智电子科技有限公司 | Based on the all-in-one of surround lighting dynamic adjustments liquid crystal display backlight illumination |
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2015
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Patent Citations (3)
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| US20100020108A1 (en) * | 2008-07-28 | 2010-01-28 | Cho Chi-O | Method and apparatus for driving a backlight assembly |
| CN204577063U (en) * | 2015-04-17 | 2015-08-19 | 广州炫智电子科技有限公司 | Based on the all-in-one of surround lighting dynamic adjustments liquid crystal display backlight illumination |
| CN104822209A (en) * | 2015-05-20 | 2015-08-05 | 无锡市崇安区科技创业服务中心 | ZigBee-based intelligent LED streetlamp control system |
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| 张光华 等: "《带电感的PWM调光方法》", 《技术与方法》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106875897A (en) * | 2016-12-23 | 2017-06-20 | 惠州市德赛西威汽车电子股份有限公司 | A kind of touch-screen automatic brightness regulation circuit |
| CN109963005A (en) * | 2019-03-28 | 2019-07-02 | 努比亚技术有限公司 | A kind of double screen brightness control system, method and computer storage medium |
| CN118411943A (en) * | 2024-07-02 | 2024-07-30 | 惠科股份有限公司 | Display panel and display device |
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Application publication date: 20151209 |