KR20040051196A - Apparatus for changing color of backlight led by surroundings - Google Patents

Abstract

PURPOSE: A backlight LED unit with color changing by environment is provided to provide various LED colors according to a change in environment by generating a control signal by a sensor. CONSTITUTION: A key input and hinge part(310) transfers a key input signal inputted from outside, and generates a sense signal by sensing opening/closing of a folder or a flip. A controller(320) generates a switch ON/OFF control signal according to the key input signal and the sense signal. An environment sensor(330) senses an environment state, converts the sensed state into a numerical value, and converts the numerical value into a digital signal. A color selector(340) generates a color determining signal for determining a light emitting color according to the digital signal. A switch unit(350) generates an LED control signal. An LED unit(360) flickers the LED with designated color according to the LED control signal.

Description

Backlight LED device whose color is changed by the environment {APPARATUS FOR CHANGING COLOR OF BACKLIGHT LED BY SURROUNDINGS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight LED device whose color is changed by the environment, and more particularly, in a portable terminal equipped with a keypad and employing a backlight at the rear thereof, by changing the backlight color of the keypad according to the outside temperature, The present invention relates to a backlight LED device whose color is changed by an environment that gives diversity to a keypad.

1 is a circuit diagram showing a conventional backlight LED device, which includes a DC power supply unit 110 for applying a power supply voltage; A plurality of LEDs 121 to 128 that are connected to the DC power supply unit 110 and emit light according to conduction of electric current; A plurality of resistors 131 to 138 each first terminal connected to a cathode of each of the plurality of LEDs 121 to 128; The emitter terminal is connected to the second terminals of the plurality of resistors 131 to 138, and receives an on / off control signal through a base terminal, and the collector terminal includes a grounded transistor 140.

FIG. 2 is a block diagram illustrating a conventional backlight LED system. The conventional backlight LED system transmits a key input signal input from a user, and detects opening and closing of a folder or a flip to generate a detection signal. And hinge portion 210; A control unit 220 receiving a key input signal and a detection signal from the key input and hinge unit 210 and generating a switch control signal according to the key input signal and the detection signal; A switch unit 230 receiving a switch control signal from the control unit 220 and conducting or blocking a current to the LED unit 240 according to the switch control signal; And an LED unit 240 blinking under the control of the switch unit 230. Here, the switch unit 230 corresponds to the transistor 140 of FIG. 1, and the LED unit 240 corresponds to the plurality of LEDs 121 to 128 of FIG. 1.

According to the conventional backlight LED system described above, the control unit 220 only controls the on / off of the switch unit 230 according to the key input signal and the detection signal from the key input and hinge unit 210, LED unit 240 has a problem of providing only a fixed color without change during lighting.

In order to solve the above problems, the present invention is equipped with a sensor for detecting the surrounding environment, and generates a control signal accordingly, thereby providing a variety of LED colors according to the environmental change, thereby providing a variety to the user It is an object of the present invention to provide a backlight LED device that changes color by.

1 is a circuit diagram showing a conventional backlight LED device,

2 is a block diagram showing a conventional backlight LED system;

3 is a block diagram showing a backlight LED device of which color is changed by an environment according to an embodiment of the present invention;

4 is a flowchart illustrating a method of changing a backlight LED color according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

310: key input and hinge unit 320: control unit

330: Environment detection unit 340: Color selection unit

350: switch unit 360: LED unit

In order to achieve the above object, a backlight LED device of which color is changed by the environment of the present invention includes: a key input and a hinge unit configured to transfer a key input signal input from the outside and detect a opening or closing of a folder or a flip; A controller configured to generate a switch on / off control signal according to the key input signal and the detection signal; An environmental sensing unit for sensing an environmental state, converting the detected state into a numerical value, and converting the numerical value into a digital signal; A color selector configured to generate a color determination signal for determining the emission color according to the digital signal; A switch unit generating an LED control signal according to the switch on / off control signal and the color determination signal; And an LED unit for blinking an LED of a specified color according to the LED control signal.

Hereinafter, the most preferred embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily implement the technical idea of the present invention. .

3 is a block diagram illustrating a backlight LED device of which color is changed by an environment according to an embodiment of the present invention. The backlight LED device of which color is changed by an environment of the present invention includes a key input and a hinge portion 310, The controller 320, the environment sensor 330, the color selector 340, the switch 350, and the LED unit 360 are included.

The key input and hinge unit 310 transmits a key input signal input from a user to the controller 320 to be described later, generates a detection signal by detecting the opening or closing of a folder or flip, and controls the detection signal to be described later ( It outputs to 320).

The control unit 320 may receive the key input signal and the detection signal from the key input and hinge unit 310, and generate a switch on / off control signal according to the key input signal and the detection signal. It serves to output the switch on / off control signal to the switch unit 350 to be described later.

Meanwhile, the environmental sensor 330 detects an environmental condition, converts the detected state into a numerical value, converts the numerical value into a digital signal, and outputs the digital signal to the color selector 340 described later. Do it. Here, the environmental sensor 330 will be described in detail.

The temperature sensor mounted in the environment sensor 330 serves to detect a temperature and output a temperature value generated by the detected temperature to an ADC which will be described later. Here, the temperature sensor may detect the terminal temperature without detecting the temperature.

In addition, the ADC mounted in the environment sensor 330 serves to receive a temperature value from the temperature sensor, convert the temperature value into the digital signal, and output the digital signal to the color selector 340 which will be described later.

In addition, the color selection unit 340, the switch receiving the digital signal from the environment sensor 330, generates a color determination signal for determining the emission color according to the digital signal, the switch to describe the color determination signal described later It serves to output to the unit 350. Here, the emission color may be determined according to the digital signal according to Table 1 below.

The switch unit 350 generates an LED control signal according to the switch on / off control signal of the controller 320 and the color determination signal of the color selector 340, and the LED control signal will be described later. It serves to output to the LED unit 360.

In addition, the LED unit 360 receives the LED control signal from the switch unit 350, and serves to flash the LED of the designated color according to the LED control signal.

The operation of the backlight LED device whose color is changed by the above-described environment of the present invention will be described below.

First, when a user opens a folder or flip or presses a key button, the key input and hinge unit 310 transmits a key input signal input from the user to the controller 320 and detects the opening or closing of the folder or flip. Generates a detection signal, and outputs the detection signal to the controller 320 to be described later. Meanwhile, the temperature sensor mounted in the environmental sensor 330 detects air temperature or terminal temperature, outputs a temperature value generated by the detected air temperature to the ADC, and thereafter, is mounted in the environmental sensor 330. The ADC receives the temperature value from the temperature sensor and converts it into the digital signal. Next, the color selector 340 receives a digital signal from the environment sensor 330 and generates a color determination signal for determining the emission color according to the digital signal. For example, if the temperature is 35 ° C., a digital signal having a value of 64 to 95 is generated according to the above Table 1, whereby the LED emission color is determined to be green. Thereafter, the switch unit 350 generates an LED control signal according to the switch on / off control signal of the controller 320 and the color determination signal of the color selector 340. Finally, the LED unit 360 In response to the LED control signal, the LED of the designated color blinks. That is, when the user opens a flip or a folder or presses a key button to activate the switch on / off control signal, the LED unit emits light in green according to the color determination signal.

4 is a flowchart illustrating a method of changing a backlight LED color according to an embodiment of the present invention, which will be described below.

First, the temperature sensor mounted in the environmental sensor 330 detects a temperature and outputs a temperature value generated by the detected temperature to the ADC, and the ADC mounted in the environmental sensor 330 is connected to the temperature sensor. The temperature value is input and converted into a digital signal (S401). Here, the temperature may be a temperature or may be a terminal temperature.

Thereafter, the LED emitting color is determined according to the temperature, which may be based on Table 1 described above (S402).

Next, the key input and hinge unit 310 transmits a key input signal input from the user to the control unit 320 and generates a detection signal by detecting the opening or closing of a folder or a flip. It is determined whether the key input has been performed and whether the folder / flip is opened, and if the key input and the folder / flip opening have not been performed, the process returns to the step of sensing the temperature (S403).

If key input and folder / flip open are performed, the LED emits light according to the determined LED emission color (S404).

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited to the drawings shown.

The present invention has an advantage of providing a variety of LED colors according to environmental changes by mounting a sensor for sensing the surrounding environment, and generates a control signal accordingly, thereby providing a variety to the user.

Claims (5)

A key input and hinge unit configured to transfer a key input signal input from the outside and generate a detection signal by detecting opening / closing of a folder or a flip; A controller configured to generate a switch on / off control signal according to the key input signal and the detection signal; An environmental sensing unit for sensing an environmental state, converting the detected state into a numerical value, and converting the numerical value into a digital signal; A color selector configured to generate a color determination signal for determining the emission color according to the digital signal; A switch unit generating an LED control signal according to the switch on / off control signal and the color determination signal; And LED unit for blinking the LED of the specified color according to the LED control signal Backlight LED device that is changed in color by the environment comprising a. The method of claim 1, wherein the environmental sensor, A temperature sensor for sensing a temperature; And ADC that receives the temperature value from the temperature sensor and converts it into the digital signal, and outputs the digital signal to the color selector Backlight LED device that is changed in color by the environment comprising a. The method of claim 2, The temperature is the temperature Backlight LED device that changes color by the environment, characterized in that. The method of claim 2, The temperature is the terminal temperature Backlight LED device that changes color by the environment, characterized in that. The method of claim 1, The color selection unit, to select a color according to Table 1 below TABLE 1 Temperature (℃) Digital signal value (0 ~ 255) LED color 58-70 0-31 blue 45.5 ~ 58 32-63 Red 33-45.5 64-95 green 19.5-33 96-127 yellow 7.5-19.5 128-159 sky -5 to 7.5 160-191 Purple -17.5--5 192-223 White -30 ~ -17.5 224-225 black Backlight LED device that changes color by the environment, characterized in that.