KR200303352Y1 - System of various color back light of cellular phone button. - Google Patents

Abstract

The present invention is a system for controlling the lighting of the mobile phone button 36 to configure a circuit so that the mobile phone button light can be easily changed and flashed to the desired color and mounted on the flexible PCB 28 and inserted into the mobile phone, for this purpose The circuit configuration and the structure of the circuit to be inserted.

According to the present invention, a button light used for the purpose of easily finding a button 36 of a mobile phone in a dark place is mainly produced by constructing a single color. The reason why the button lighting is composed of a single color is that most mobile phones emit LEDs 12 through a circuit controlled by the central controller. The driving of the LEDs 12 varies in driving voltage and driving current depending on the colors. Since it is difficult to drive the LEDs 12 of various colors in the central control unit having the same driving conditions, the electronic circuits of the LEDs 12 may be configured even if the electronic circuits having different driving conditions are configured according to the colors of the LEDs 12. The degree of brightness and color diffusion varies slightly among LED manufacturers, so it is very difficult to realize uniform color. The scheme proposed in the present invention removes the LED 12 of the existing mobile phone, inserts a circuit composed of the transistor 16, the resistor, the LED 12, and the flexible PCB 28 into the mobile phone, and inserts the flexible PCB ( The positive power connector 30 and the negative power connector 32 of the 28) are connected to the cellular phone battery power terminal 2, and the LED drive signal 4, the speaker control signal 6, and the vibration inputted from the central controller of the cellular phone. By connecting the control signal 8 to the control signal connection part 34 of the flexible PCB 28 to which the present circuit is mounted, a system for enabling the replacement of the button light color of the mobile phone and the blinking of the LED 12 is proposed.

Description

System of various color back light of cellular phone button.}

The present invention relates to a mobile phone button lighting implementation system of a variety of colors, and more specifically, to replace the single button mobile phone lights of a single color with a variety of colors, LED drive signal (4) input from the central control unit of the mobile phone, mobile phone The LED 12 is driven according to the speaker control signal 6 or the vibration control signal 8 outputted at the time of incoming call, and the system is designed to change the brightness and the blinking of the light. The LED 12 for button lighting of a conventional mobile phone is directly driven through a circuit connected to a central controller. The output port voltage and current of the central controller have a constant rating, whereas the LEDs 12 are different from each other according to color. Because of the different driving conditions, it is difficult to simultaneously drive the LEDs 12 of various colors. By ignoring this and using LEDs of different colors, LEDs 12 with high driving voltages will not be turned on, resulting in uneven brightness of light. In addition, there is a difficulty in the light and thin short circuit of the circuit for mounting on a mobile phone with less free space.

In the present invention, the LED 12 was driven by using a mobile phone battery power in order to realize button lights of various colors, and the input battery power provided a power saving effect through a PWM method control, and the LED driving signal 4 was The circuit 12 was configured to receive input from the central control unit of the controller or from the speaker control signal 6 or the vibration control signal 8 of the cellular phone to control the LED 12 flashing and brightness. In addition, the high brightness ultra small LED 12 and the driving elements were selected so that there is no problem in use even when inserted into the mobile phone, and then mounted on the ultra-thin flexible PCB 28, so that the mobile phone can be inserted into the mobile phone.

The purpose of the present invention is to simplify the operation of the LED 12, which is a general method for implementing various colors of mobile phone button lighting, and to prevent the breakdown of the mobile phone during the operation, and to insert various colors by simply inserting it into the mobile phone. It is to configure a microelectronic circuit on a flexible PCB 28 having a thickness of 0.1mm or less to implement. The electronic circuit of the present invention applies a PWM control method to minimize the power consumption of the LED 12, the LED 12 driving power source of the mobile phone battery for uniform brightness and color diffusion to the LED 12 of various colors Use power. LED (12) The signal for various changes of light is designed to be input from the LED driving signal (4), the speaker control signal (6) and the vibration control signal (8) of the central processing unit of the existing mobile phone by a variety of mobile phone users Easily accommodate your needs. The LED driving signal 4 has two types of high output and low output according to the type of cellular phone. The drawing illustrated in FIG. 1 is designed based on the low output. In the case of the high output, the transistor 16 is connected to the NPN type. Replacing the transistor 16 and removing the bias resistor 22 causes the same operation.

1 is an exemplary circuit diagram for changing a button light of a mobile phone according to the present invention

2 is a mobile phone coupling example of the present invention

<Description of the symbols for the main parts of the drawings>

2. Mobile phone battery power terminal 4. LED drive signal

6. Speaker control signal 8. Vibration control signal

10. PWM control circuit 12. LED

14. LED driving circuit 16. Transistor

18. LED input resistance 20. Transistor input resistance

22. Bias resistor 24. Base resistor

26.Keypad board 28. flexible PCB

30. Positive power connection 32. Negative power connection

34. Control signal connector 36. Button

Referring to the configuration according to the present invention with reference to the accompanying drawings, preferred embodiments of the present invention are as follows. The present invention relates to a mobile phone button lighting implementation system of various colors, as shown in Figure 1, the DC power input from the mobile phone battery power supply terminal 2 has a duty ratio of about 50% in the PWM control circuit (10) By switching to a pulse waveform output having a minimum power consumption compared to the luminance of the LED (12). The output power of the pulse waveform is connected to the emitter of the transistor 16 through the transistor input resistor 20, and in order to prevent the switching and malfunction of the transistor 16, the bias resistor between the emitter and the base of the transistor 16 22) is connected. Signal inputs for controlling the flashing and brightness of the LED 12 are the LED drive signal 4, the speaker control signal 6, the vibration control signal 8 of the central control unit, and the transistor 16 through the base resistor 24. ) Is entered. The LED 12 connected to the collector of the transistor 16 through the LED input resistor 18 receives the input voltage of the pulse waveform input to the emitter of the transistor 16 according to the control signal changed through the base resistor 24. The brightness of the LED 12 may vary depending on the duty ratio of the pulse generated in the PWM control circuit 10 and the value of the elements constituting the LED driving circuit 14. The blinking of 12) is determined depending on the presence or absence of a signal input through the base resistor 24. The LED driving circuit 14 including the PWM control circuit 10 is mounted on a flexible PCB 28 of 0.1 mm or less as shown in FIG. 2, and the positive power supply connection 30 and the negative power connection 32 are connected to the battery. The control signal connector 34 is located on the side of the flexible PCB 28 for easy connection with the LED drive signal 4 of the central control unit located on the keypad 26. Position it. To mount the flexible PCB (28), peel off the double-sided adhesive tape attached to the back of the flexible PCB (28), and then attach the flexible PCB (28) to the top surface of the mobile phone keypad board 26, plus the power supply connection (30), negative power connection ( 32 is connected to the mobile phone battery, and the control signal connection unit 34 connects to the central control unit LED drive signal 4, the speaker control signal 6 or the vibration control signal 8 of the keypad substrate 26.

According to the present invention as described above, to configure the illumination of the mobile phone button 36 in a variety of colors and to control the brightness and flashing of the illumination to reduce the inconvenience of having to remove and re-install the LED 12 one by one to easily work Not only that, but you can freely configure the lighting of various colors. In addition, it can reduce the damage of the mobile phone that can occur during work and can solve the luminance inequality due to the difference in the driving conditions for each LED (12) color. In terms of power consumption, the PWM control circuit 10 may be applied to minimize power consumption due to the LED 12. Therefore, the system according to the present invention simplifies the complexity of the work, which is a disadvantage of the manual method, and reduces power consumption, and also enables various color implementations.

Claims (2)

In manufacturing the mobile phone button lighting control device, the flexible PCB 28 having a thickness of 1 mm or less can be inserted into the mobile phone case and the keypad substrate 26 and the keypad is coated with an adhesive on the bottom surface of the fiexible PCB 28. Easily attached to the substrate 26, the structure of the mobile phone button lighting control device that can be applied without deformation of the mobile phone injection. PWM control circuit 10 for power saving, LED input resistor 18 for controlling the equalization brightness of LED and speaker control signal 6, LED drive signal 4, LED 12 from vibration control signal 8 Mobile phone button lighting control device comprising a transistor (16) for operating the flashing control.