CN204795797U

CN204795797U - LED backlight controller

Info

Publication number: CN204795797U
Application number: CN201520556306.5U
Authority: CN
Inventors: 章永生; 赵鑫
Original assignee: Tianjin Northtop Information Technology Co ltd
Current assignee: Tianjin Northtop Information Technology Co ltd
Priority date: 2015-07-29
Filing date: 2015-07-29
Publication date: 2015-11-18
Anticipated expiration: 2025-07-29

Abstract

In work and life, people always encounter the situation that the keys cannot be seen clearly due to insufficient light, and at the moment, people can only grope for input by experience. I have designed an LED backlight circuit based on this aspect. The utility model discloses a multistage dimming's backlight circuit only needs to press the button of adjusting luminance, and the electric current of backlight will change according to control signal to change the light and dark change of backlight. If the backlight keys are not arranged, the input of information in a dark environment becomes a challenge, so that the normal work of people is influenced, the utility model is an LED backlight circuit, the first part is a key jitter elimination circuit and receives dimming signals input by the keys; the middle part is a multi-stage control circuit which comprises a counter and a driver and enables the received dimming signal to be changed into driving current for driving the LED lamp; the third part is a multi-stage LED dimming circuit, and the purpose of controlling the driving current flowing through the LED lamp beads is achieved according to different resistance resistors connected in series with the conduction path, so that the brightness of the LED lamp is adjusted. Therefore, the utility model discloses a controller has high-efficient drive, multistage drive, and adjustable is shaded and the energy consumption is lower, has extensive application.

Description

A kind of LED-backlit controller

Technical field

The utility model relates to a kind of LED-backlit controller, can change the secretly bright, low in energy consumption of LED-backlit, have the scope of application widely according to the change of control signal.

Background technology

The development of modern electronic equipment, our life is dissolved into by more and more diversified input equipment.But for input equipment input capability under circumstances guarantee we do imperfect.The design adopts comparatively simply, efficient method inputs one to equipment and carries out perfect under dark condition.

Summary of the invention

Technical problem to be solved in the utility model is, proposes one and has efficient, low in energy consumption and use LED-backlit controller widely.

The technical solution adopted in the utility model is: a kind of LED-backlit controller, includes Multistage Control module, it is characterized in that, be also provided with: button disappears and trembles module, trembles process for disappearing to the push button signalling of input; LED light-adjusting module, for changing the drive singal of equipment into current signal, the bright dark change of driving LED.

Described Multistage Control module includes 74LS161A digit counter and ULN2803ALED driving chip.Wherein digit counter U3 is for accessing external key signal, exports LED-backlit level logic signal.The logic control level that LED drive chip U3 produces for accessing counter, exports LED drive level, the bright dark change of driving LED; Electric capacity C4, C5, C6, C7 carry out voltage regulation filtering to chip power; Resistance R4, R5 and electric capacity C2, C3 produce the effect of electrification reset to U3, ensure that original levels signal is correct; Resistance R3 plays a part to input current limliting to U3 chip, ensures chip steady operation.

Described button disappears and trembles module and include key-press input interface S1, for accessing external key signal, exports the level signal after disappearing and trembling; Electric capacity C1 carries out voltage regulation filtering to chip power; Resistance R1 and R2 plays respectively and carries out effect that is drop-down and pull-up to input signal, ensures that the logic level of input is stablized.

Described LED light-adjusting module includes the current-limiting resistance of different resistance and each current-limiting resistance accesses row's common anode level LED light-emitting diode.The bright dark change of LED is controlled by limiting the drive current flowing through LED.

A kind of LED-backlit controller energy consumption of the present utility model is lower, with a wide range of applications.If do not have the button of backlight, under dark environment, input information will become a kind of challenge, thus affects our normal work, and this utility model is a kind of LED backlight circuit, and Part I is that button disappears twitter circuit, receives the dim signal of key-press input; Mid portion is Multistage Control circuit, comprises counter and driver, makes the dim signal received become the drive current of driving LED lamp.; Part III is multi-stage LED light adjusting circuit, and the different valued resistor be connected in series according to guiding path realize the object controlling to flow through LED lamp bead drive current, regulates LED light dark.Therefore a kind of controller of the present utility model has high efficiency drive, multiple drive power, dimmable backlights and energy consumption is lower, with a wide range of applications.

Accompanying drawing explanation

Fig. 1 is overall structure block diagram of the present utility model;

Fig. 2 is that the utility model button disappears and trembles the working circuit diagram of module;

Fig. 3 is the working circuit diagram of the utility model Multistage Control module;

Fig. 4 is the working circuit diagram of the utility model LED light-adjusting module;

Wherein: S1: key-press input switch.

Embodiment

Below in conjunction with embodiment and accompanying drawing, a kind of LED backlight system of the present utility model is described in detail.

As shown in Figure 1, a kind of LED-backlit control system of the present utility model, includes Multistage Control module 2, it is characterized in that, be also provided with: button disappears and trembles module 1, trembles process for disappearing to the push button signalling of input; LED light-adjusting module 3, for changing the drive singal of equipment into current signal, the bright dark change of driving LED.

As shown in Figure 2, described button disappears and trembles module 1 and include push button signalling input interface S1, for accessing external key signal, exports the level signal after disappearing and trembling; Electric capacity C1 carries out voltage regulation filtering to chip power; Resistance R1 and R2 plays respectively and carries out effect that is drop-down and pull-up to input signal, ensures that the logic level of input is stablized.

As shown in Figure 3, described Multistage Control module 2 includes 74LS161A digit counter and ULN2803ALED driving chip.Wherein digit counter U3 is for accessing external key signal, exports LED-backlit level logic signal.The logic control level that LED drive chip U3 produces for accessing counter, exports LED drive level, the bright dark change of driving LED; Electric capacity C4, C5, C6, C7 carry out voltage regulation filtering to chip power; Resistance R4, R5 and electric capacity C2, C3 produce the effect of electrification reset to U3, ensure that original levels signal is correct; Resistance R3 plays a part to input current limliting to U3 chip, ensures chip steady operation.

As shown in Figure 4, described LED light-adjusting module 3 includes the current-limiting resistance of different resistance and each current-limiting resistance accesses row's common anode level LED light-emitting diode.The bright dark change of LED is controlled by limiting the drive current flowing through LED.

A kind of LED-backlit controller energy consumption of the present utility model is lower, with a wide range of applications.

If do not have the button of backlight, under dark environment, input information will become a kind of challenge, thus affects our normal work, and this utility model is a kind of LED backlight circuit, and Part I is that button disappears twitter circuit, receives the dim signal of key-press input; Mid portion is Multistage Control circuit, comprises counter and driver, makes the dim signal received become the drive current of driving LED lamp; Part III is multi-stage LED light adjusting circuit, and the different valued resistor be connected in series according to guiding path realize the object controlling to flow through LED lamp bead drive current, regulates LED light dark.

Claims

1. a LED-backlit controller, includes Multistage Control module (2), it is characterized in that, be also provided with: button disappears and trembles module (1), trembles process for disappearing to the push button signalling of input; LED light-adjusting module (3), for changing the drive singal of equipment into current signal, the bright dark change of driving LED.

2. a kind of LED-backlit controller according to claim 1, it is characterized in that, described Multistage Control module (2) includes 74LS161A digit counter and ULN2803ALED driving chip, wherein digit counter U2 is for accessing external key signal, export LED-backlit level logic signal, the logic control level that LED drive chip U3 produces for accessing counter, exports LED drive level, the bright dark change of driving LED; Electric capacity C4, C5, C6, C7 carry out voltage regulation filtering to chip power; Resistance R4, R5 and electric capacity C2, C3 produce the effect of electrification reset to U3, ensure that original levels signal is correct; Resistance R3 plays a part to input current limliting to U3 chip, ensures chip steady operation.

3. according to a kind of LED-backlit controller according to claim 1 or claim 2, it is characterized in that, described button disappears and trembles module (1) and include key-press input interface S1, for accessing external key signal, exports the level signal after disappearing and trembling; Electric capacity C1 carries out voltage regulation filtering to chip power; Resistance R1 and R2 plays respectively and carries out effect that is drop-down and pull-up to input signal, ensures that the logic level of input is stablized.

4. according to a kind of LED-backlit controller according to claim 1 or claim 2, it is characterized in that, described LED light-adjusting module (3) includes the current-limiting resistance of different resistance and each current-limiting resistance accesses row's common anode level LED light-emitting diode, and the drive current flowing through LED by restriction controls the bright dark change of LED.