KR20040073885A - Display reset apparatus for mobile terminal and method thereof - Google Patents

Abstract

PURPOSE: A device for resetting a display of a portable terminal and a method therefor are provided to automatically reset a terminal display when static electricity is applied, by using a static electricity detector for supplying a predetermined signal to a terminal controller if a high voltage is applied, thereby removing an insensitive phenomenon of the display. CONSTITUTION: A static electricity detector(130) recognizes that more than a predetermined voltage is applied, and outputs a logic signal. An LCD display(110) comprises an inner memory, and outputs screen data stored in the inner memory. A memory(120) mirrors the screen data in real time, and stores the mirrored screen data. A controller(100) compares the mirrored screen data with the screen data stored in the inner memory of the LCD display(110) if static electricity is recognized, and resets the LCD display(110) only when the compared data are different.

Description

DISPLAY RESET APPARATUS FOR MOBILE TERMINAL AND METHOD THEREOF}

The present invention relates to an apparatus and method for resetting a display unit of a mobile terminal, and particularly, to detect static electricity that can be applied while the mobile terminal is in use, and to check a display unit operating state by the detected static electricity and to reset the display unit if it is malfunctioning, thereby ensuring normal display unit operation. The present invention relates to an apparatus and method for resetting a display unit of a portable terminal.

With the widespread use of portable terminals, portable terminals have become one of the essential portable goods of modern people. In addition, as researches incorporating more functions into portable devices become more and more effective, high-quality services such as playing multimedia data, taking pictures, and watching TV using limited-size portable devices are available. It became.

Integrating these various functions into a limited size portable terminal inevitably requires miniaturization and low current operation of the component circuits, thereby weakening the electrical immunity of the circuits used. That is, the possibility of malfunction even by a weak electric shock is increased.

Users who carry the portable terminal store the portable terminal in their clothes or bags, and the environment in which the user lives is also surrounded by various electronic devices, and thus the portable terminal is exposed to an electric shock-prone environment.

The most frequent of these electric shocks affects the mobile terminal is an electric shock caused by static electricity, which generates a voltage of several thousand volts instantaneously. Although the appearance of the portable terminal is made of a non-conductive material, static electricity can easily affect the internal circuit.

The most affected part is the LCD display. Since the physical area is larger than other parts and sensitive to voltage, but many signal lines overlap, there is a high risk of exposure to static electricity, and the LCD display driven by the controller by static electricity may stop.

In general, the LCD display unit has a display controller and a display memory that records data to be displayed on the screen in addition to the display driver and driver. By providing the screen data to be displayed in the display unit memory, the main controller of the portable terminal can be freed from the burden of constantly watching the display on the screen. These LCD displays are gradually increasing in size, increasing in resolution, and increasing in color of simultaneous expression, so that more precise circuit configurations are required. Therefore, when a shock caused by static electricity is applied to the graphic controller of the LCD display unit having low external voltage immunity, the LCD screen stops, displays no display, or the screen is broken. The numbness phenomenon refers to a phenomenon encompassing all kinds of malfunctions, not normal screen output.

The insensitivity may be caused by static electricity impacting other components of the LCD display unit or malfunctioning of interface parts connected to the main controller of the terminal, and may also be affected by malfunctions occurring in other parts of the mobile terminal. have.

However, until now, a device for checking the generation of static electricity in a portable terminal has not been applied, and a simple static eliminator is only applied to an internal chip. This prevents breakage of the chip but does not correspond to malfunction of the mobile terminal. Other internal circuits are affected by static electricity and dissipate the static electricity along the path of the internal circuit.

That is, internal circuit protection against static electricity has been designed with some consideration, but no consideration has been given to compensation of the LCD display unit which is likely to malfunction due to a momentary impact.

Among the performance test items of the terminal, there is an electrostatic test, and in order to pass the test, the portable terminal must be able to withstand even when static electricity is applied. To solve this problem, the portable terminal in the form of a folder must be forced to reset the LCD display by closing and opening it. This is because when the folder is closed, the LCD display unit stops the operation, so that the display contents are updated by opening the folder again. In other words, manual operation by the user is required.

1 illustrates a structure in which a conventional foldable portable terminal can be manually reset when it is insensitive to the influence of static electricity.

As shown, an LCD display unit 20 including a driver, a graphics controller, a memory, and the like, a memory unit 30 for generating and storing screen data to be displayed on the LCD display unit 20, and the memory unit. And a controller 10 for providing the screen contents stored in the 30 to the LCD display unit 20 and setting whether the LCD display unit is operated by an external folder operation signal.

In general, when an electrical shock is applied to the mobile terminal due to the generation of static electricity, malfunctioning parts may occur due to an instantaneous voltage among various devices, and thus there is an insensitivity state in which the LCD display unit 20 cannot display a normal screen. In order to solve this problem, the user should close and open the folder to update the LCD display unit 20. This is because the control unit 10 does not recognize that the static electricity is generated, it is also unknown that the state of the LCD display unit 20 may be insensitive.

In other words, the conventional LCD display insensitivity due to the generation of static electricity requires a manual operation of the user, and the user may be surprised at the insensitive state of the LCD display.

As described above, the conventional mobile terminal is affected by the static electricity generated in the entire terminal, and since the terminal cannot recognize the malfunction, the malfunction of the display unit affected by the static electricity is also not recognized. Therefore, the user's manual operation is required. There was discomfort. In addition, there is a problem in that the reliability of the terminal is deteriorated because the user mistaken the display unit operation stop.

In view of the above problems, the present invention eliminates display insensitivity by automatically resetting the terminal display unit when static electricity is applied by using an electrostatic detector that provides a predetermined signal to the terminal controller when a high voltage such as static electricity is applied. It is an object of the present invention to provide an apparatus and method for resetting a display unit of a portable terminal.

1 is a block diagram showing the structure of a terminal display unit reset device by a conventional static electricity.

2 is a simplified block diagram of an embodiment of the present invention.

Figure 3 is a structure of the static electricity detector that can be applied to an embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

100: control unit 110: LCD display unit

120: memory unit 130: static electricity detection unit

135: D flip-flop

The present invention for achieving the above object, the electrostatic detection unit for detecting the instantaneous voltage of a predetermined level or more and providing it as a fixed logic signal; A display unit having an internal memory and displaying contents thereof; And a controller configured to provide screen data to the internal memory of the display unit and to reset the display unit according to a preset reference when static electricity is detected by an output of the static electricity detector.

And a memory unit for mirroring and storing screen data provided to the display unit in real time, wherein the controller detecting the occurrence of static electricity by the output of the static electricity detector differs by comparing the stored data of the memory unit with internal memory data of the display unit. Only to reset the display unit.

A reset method of a display reset apparatus comprising: an electrostatic detector detecting a static electricity generation; and a memory unit mirroring screen data provided to the display in real time, the method comprising: recognizing, by the controller, static electricity generation through an output of the static electricity detector; Comparing, by the control unit recognizing the occurrence of static electricity, screen data mirrored in the memory unit with data of the display unit; And resetting the display unit only when the comparison result is different.

When described in detail with reference to the accompanying drawings an embodiment of the present invention as follows.

2 is a block diagram showing a simplified configuration of an embodiment of the present invention, and as shown, when a predetermined voltage or more is applied, an electrostatic detection unit 130 for recognizing this and outputting a logic signal; An LCD display unit 110 having an internal memory and outputting screen data stored therein; A memory unit 120 for real-time mirroring and storing screen data provided to the internal memory of the LCD display 110; When the static electricity is detected by the output of the static electricity detector 130, the screen data stored in the internal memory of the LCD display 110 and the mirrored screen data of the memory 120 are compared with each other and the LCD display unit ( The control unit 100 for resetting 110.

The static electricity detector 130 may use various static electricity detection circuits, and is configured to output a fixed logic signal in response to an instantaneous high voltage. An embodiment of the static electricity detector 130 will be described in more detail later.

The static electricity detector 130 detects when a predetermined voltage (for example, 50V) or more is instantaneously applied and provides a fixed logic signal to the general-purpose input / output port (GPIO) of the controller 100. The controller 100 may be configured to initialize the output by providing a reset signal to the static electricity detector 130 after recognizing this.

The controller 100 generates a screen output according to the current state of the portable terminal, and simultaneously provides the generated screen data to the internal memory of the LCD display 110 and the memory 120 that is part of the main memory. The memory unit 120 acts as a kind of mirror storage unit which stores the same screen data as the screen data of the LCD display 110 in real time, thereby determining whether the screen state of the LCD display 110 is normal.

Naturally, unlike the above embodiment, even without the memory unit 120 performing the mirroring operation, the controller 100 resets the LCD display 110 whenever the static electricity is detected by the static electricity detection unit 130, It can prevent numbness that may occur. However, if the static electricity occurs frequently, the LCD display 110 repeats the reset operation accordingly, so that the user can recognize the blinking. Therefore, it is preferable to reset only when the LCD display 110 malfunctions as in the present embodiment.

The LCD display 110 may further include an LCD panel, a driving driver, a graphics controller, and an internal memory internally. When the screen data is received from the controller 100 and stored in the internal memory, the LCD display 110 may be internally configured by its own graphics controller. The contents of the memory will be displayed on the screen. Therefore, when a malfunction occurs due to static electricity, the contents of the internal memory of the LCD display 110 are different from the contents provided by the controller 100.

Through the above configuration, when the static electricity is detected, the display unit may be reset by software. Also, when the display unit is unsensitized, the display unit may also be checked to reset the display unit only when the insensitivity occurs. The user's anxiety due to the display unit insensitivity can be solved.

Now, an embodiment of the static electricity detector 130 that can be used in the present invention will be described with reference to FIG. 3. Although the electrostatic detector 130 shown in FIG. 3 may be an optimal embodiment, it is noted that circuits employing commonly used electrostatic discharge circuits or applying voltage detection devices such as analog to digital converters may also be used. That is, the specific configuration of the static electricity detecting means does not limit the present invention.

As shown in FIG. 3, the illustrated static electricity detector includes an electrostatic switch portion including a diode D1 and a voltage limiting resistor R1, and RC portions R2 and C1 and a D flip-flop 135 for generating a clock signal. It can be divided into a logic circuit portion consisting of a control unit 100, and receives the presence or absence of static electricity generated by the logic circuit portion as a logic signal and provides a control signal for resetting the logic circuit portion.

The high capacitance diode D1 is a diode that is turned on only when a voltage applied from the illustrated input terminal is greater than or equal to a predetermined capacitance. For example, if the diode D1 has a capacitance of 50 V, an electrostatic signal of 50 V or more is applied. Only turns on. In other words, it serves as a kind of electrostatic switch.

When an electrostatic voltage such that the high capacitance diode D1 is turned on is applied, it cannot be provided directly to the internal circuit, so the voltage should be limited to the internal use voltage level. To this end, a voltage limiting resistor R1 is connected in series with the high capacitance diode D1. In order to reduce the voltage to 5 V or less, it is preferable to use a resistor having a resistance value of several orders of magnitude.

The electrostatic signal passing through the voltage limiting resistor R1 is limited to the voltage used internally, but cannot be directly applied to the controller because its current is weak and its duration is short. Since the controller performs various operations and operations, the controller may fail to capture the electrostatic signal generated for a short time. Thus, as shown in the drawing, the control unit 100 maintains the signal due to the static electricity until the controller 100 recognizes the electrostatic signal by using the D flip-flop 135, which is a memory device, and the controller 100 performs the D flip-flop. After recognizing the signal of 135, the D flip-flop 10 is reset to initialize the signal output (logic 0) before acquiring an electrostatic voltage.

Since the D flip-flop 135 receives the input signal applied by the clock signal and determines the output logic according to the input voltage, the D flip-flop 135 needs to generate a clock that receives the stepped electrostatic signal applied to the input. By connecting the RC delay circuit consisting of R2 and C1 to the clock part, the delayed setup time is provided to the clock of the D flip-flop 135 so that the D flip-flop 135 can latch an instantaneous static signal. do.

Since the static electricity detector 130 applied to the present invention is not limited to the circuit described with reference to FIG. 3, it should be regarded as a means for understanding the specific operation of the present invention.

Through the embodiment of the present invention configured as described above, the controller can recognize whether the static electricity is generated instantaneously and adversely affects the portable terminal, and can properly prevent the display unit insensitivity caused by the static electricity. Will be.

As described above, the display device resetting apparatus and method of the present invention recognizes that the static electricity is supplied to the mobile terminal, and then checks the operation of the display unit. Along with the effect of maintaining the performance of the terminal, there is an effect of increasing the reliability of the terminal by not exposing the display unit malfunction to the user.

Claims (3)

An electrostatic detector for detecting an instantaneous voltage of a predetermined level or more and providing the same as a fixed logic signal; A display unit having an internal memory and displaying contents thereof; And a controller configured to provide screen data to the internal memory of the display unit and to reset the display unit according to a predetermined reference when static electricity is detected by the output of the static electricity detector. The display apparatus of claim 1, further comprising a memory unit configured to mirror and store screen data provided to the display unit in real time, wherein the controller that detects static electricity generated by an output of the static electricity detector is stored in the memory unit and inside the display unit. And resetting the display unit only in a case where the memory data is different from each other in comparison with the memory data. A reset method of a display reset apparatus comprising: an electrostatic detector detecting a static electricity generation; and a memory unit mirroring screen data provided to the display in real time, the method comprising: recognizing, by the controller, static electricity generation through an output of the static electricity detector; Comparing, by the control unit recognizing the occurrence of static electricity, screen data mirrored in the memory unit with data of the display unit; And resetting the display unit only when the comparison result is different.