KR100598063B1 - Apparatus and its method for protecting whitening appearance of LCD - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to an apparatus for preventing bleaching and a method thereof.

2. The technical problem to be solved by the invention

According to the present invention, when an electronic device having a display device detects a whitening phenomenon of a display device (LCD), the display driver integrated circuit (DDI) is hard reset by controlling a general-purpose input / output port (GPIO) connected to the display device (LCD). It is an object of the present invention to provide a device and a method for preventing bleaching to prevent bleaching due to an error of a display driver integrated circuit (DDI) by software without rebooting.

3. Summary of the Solution of the Invention

In the apparatus for preventing bleaching of a wireless communication terminal, the graphic data is received and stored according to the control of the control means, the display means is driven accordingly, and is hardly connected through the general purpose input / output port (GPIO) of the control means. Display driving means for performing a hard reset upon receiving a reset signal; The display means for being driven by the display driving means to output graphic data; And control means for transmitting a hard reset signal to the display driving means through the general-purpose input / output port (GPIO) in response to detecting the whitening phenomenon of the display means.

4. Important uses of the invention

The present invention is used for electronic devices having a display device such as a wireless communication terminal, a computer, a camcorder, a digital camera, an LCD TV, and the like.

Wireless communication terminal, display driver integrated circuit (DDI), liquid crystal display (LCD), whitening, hard reset, initialization

Description

Apparatus and its method for protecting whitening appearance of LCD}             

1 is a configuration diagram of an embodiment of a wireless communication terminal having a device for preventing bleaching according to the present invention;

2 is a flowchart illustrating a method of preventing whitening in a wireless communication terminal according to the present invention.

* Description of the main parts of the drawings

10: General Purpose Input / Output Port (GPIO) 11: Wireless Transceiver

12: Central Processing Unit (MSM) 13: Codec

14: storage device 15: audio output device (speakers)

16: display device (LCD) 17: input device (keypad)

18: voice input device (microphone) 19: display driver integrated circuit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for preventing bleaching, and more particularly, to prevent bleaching, in which an electronic device or the like having a display device does not output desired data to a display device (LCD). It relates to a development preventing device and a method thereof.

In the present invention, the electronic device refers to an electronic device having a display device such as a wireless communication terminal, a computer, a camcorder, a digital camera, and an LCD TV.

In addition, in the present invention, a wireless communication terminal is a mobile communication terminal, a personal mobile communication terminal (PCS), a personal digital terminal (PDA), a smart phone, a next generation mobile communication terminal (IMT-2000), while carrying a personal such as a wireless LAN terminal A terminal capable of wireless communication.

Recently, thanks to the development of information and communication and the Internet, the display industry has also been rapidly developed, and the liquid crystal display (LCD: liquid crystal display), which has been extended to notebook PCs and desktop PCs as well as TVs, It is made by cutting-edge digital technologies such as plasma display panel (PDP), which is used for large screen products such as wall-mounted TV, and organic EL (Electro Luminescence), which is applied to small devices such as wireless communication terminals. Digital flat panel displays (FPDs) are widely used.

Among them, a liquid crystal display (LCD) applies a voltage to a specific molecular arrangement of a liquid crystal to convert it into a molecular arrangement of another type, and the birefringence, photoreactivity, dichroism, and light scattering properties of the liquid crystal cell that emit light by such molecular rearrangement. As a non-light-emitting display device using optical properties such as light, it is most commonly used among digital flat panel displays (FPDs) because of its lightness and low power consumption.

On the other hand, an LCD driver integrated circuit (LDI: LCD Driver IC) is an essential device for driving / controlling a flat panel display device (liquid crystal panel) such as an LCD, and includes LCD panel types (TN (Twisted Nematic) and STN (Super Twisted Nematic). ) And TFT (Thin Film Transistor).

In general, the number of LCD driver ICs (LDI: LCD Driver IC) is determined according to the size of the LCD and the number of colors to be processed by the LCD, and one to several dozens are attached to one LCD to drive the LCD. . Recently, as flat panel display devices (FPDs) are diversified to organic ELs, plasma display panels (PDPs), and the like, driver integrated circuits that are used in all display devices as a higher concept of LCD driver integrated circuits (LDIs). The term display driver integrated circuit (DDI), collectively known as (IC), has emerged.

On the other hand, when using a wireless communication terminal there is a case that no data is output to the screen. This phenomenon also occurs in a liquid crystal display (LCD) of a computer system. As such, the phenomenon in which no data is output to the liquid crystal display (LCD) is called a whitening phenomenon.

This whitening may be caused by various causes, but may be caused by a timing error in hardware during the display driver integrated circuit (DDI) initialization.

However, in the related art, when the whitening phenomenon occurs, the wireless communication terminal cannot detect the occurrence of the whitening phenomenon, and there is a problem that can be solved only by the user rebooting.

The present invention has been proposed to solve the above problems, and when detecting the whitening phenomenon of the display device (LCD) in an electronic device having a display device, the general-purpose input-output port (GPIO) connected to the display device (LCD) By controlling the hard reset of the display driver integrated circuit (DDI) to control, the present invention provides a device and a method for preventing bleaching by software without rebooting due to an error of the display driver integrated circuit (DDI) Its purpose is to.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

In the apparatus of the present invention for achieving the above object, in the apparatus for preventing bleaching of a wireless communication terminal, the graphic data is received and stored according to the control of the control means, thereby driving the display means, Display driving means for performing a hard reset upon receiving a hard reset signal through a general-purpose input / output port (GPIO); The display means for being driven by the display driving means to output graphic data; And the control means for transmitting a hard reset signal to the display driving means through the general-purpose input / output port (GPIO) in response to detecting the whitening phenomenon of the display means.

On the other hand, the method of the present invention is a display driving means for writing whitening detection data preset in display driving means and reading data from the display driving means in a method of preventing whitening in a wireless communication terminal. Read / write phase; An initialization step of initializing the display driving means by using a preset initialization value; A whitening phenomenon detecting step of detecting a whitening phenomenon according to the data read from the display driving means and the predetermined whitening detection data not coincident or the initialization value of the display driving means and a predetermined initialization value do not match; And transmitting a hard reset signal through a general-purpose input / output port (GPIO) to hard reset the display driving means.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. In the following description, an embodiment of the apparatus for preventing bleaching according to the present invention is provided in a wireless communication terminal. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration of an embodiment of a wireless communication terminal having a bleaching prevention device according to the present invention.

As shown in FIG. 1, the wireless communication terminal including the anti-wrinkle device according to the present invention includes a wireless transmission / reception device 11, a central processing unit (MSM) 12, a codec 13, and a storage device. Device 14, audio output device (speaker) 15, display device (LCD) 16, input device (keypad) 17, voice input device (microphone) 18, and display driver integrated circuit (DDI) 19).

The wireless transmission and reception apparatus 11 transmits and receives a signal wirelessly through an antenna.

The central processing unit (MSM) 12 drives and controls the wireless communication terminal, and detects the whitening phenomenon to hard reset the display driver integrated circuit (DDI) 19. To control (10). The general-purpose input / output port (GPIO) 10 transmits a signal for hard reset of the display driver integrated circuit (DDI) 19 under the control of the central processing unit (MSM) 12.

The codec 13 converts a signal received from the wireless transmitting and receiving device 11 into a voice and outputs it to a voice output device (speaker) 15 under the control of the central processing unit (MSM) 12. Then, the voice input from the voice input device (microphone) 18 is converted into a signal and transmitted to the central processing unit (MSM) 12 to be transmitted through the wireless transmission and reception device (11).

The storage device 14 stores programs and file systems (images, characters, icons) for driving the wireless communication terminal.

The voice output device (speaker) 15 outputs the voice received from the codec (13), and the voice input device (microphone) 18 receives the voice and the codec (13) To pass.

The display device (LCD) 16 receives and outputs a screen controlled by the central processing unit (MSM) 12 through a display driver integrated circuit (DDI) 19.

The input device (keypad) 17 receives a telephone number, menu selection information, and the like through a button.

The display driver integrated circuit (DDI) 19 receives graphic data under the control of the central processing unit (MSM) 12 and stores the graphic data in a Graphic RAM (GRAM) (not shown). Accordingly, the display device (LCD) 16 is driven, and a hard reset is performed according to a signal received from the CPU 12 through the GPIO 10. In this case, the reset pin of the display driver integrated circuit (DDI) 19 should be connected to the general-purpose input / output port (GPIO) 10 of the central processing unit (MSM) 12.

That is, in the related art, the reset pin of the display driver integrated circuit (DDI) 19 is connected to the "RESOUT" pin of the central processing unit (MSM) 12, but the "RESOUT" pin is booted once. Since it is a pin that cannot be controlled later, the reset pin of the display driver integrated circuit (DDI) 19 is replaced by a general-purpose input / output port (GPIO) 10 of the central processing unit (MSM) 12. In this case, the MSM 12 can reset the LCD 16 when it detects the whitening phenomenon of the LCD 16 even after booting.

The general purpose input / output port (GPIO) 10 is provided in a central processing unit (MSM) 12 and is connected to the input / output devices 16 and 17. The general purpose input / output port (GPIO) 10 is generally responsible for the available digital input and output functions, several can be used.

The overall operation of the present invention will be described in detail with reference to FIG. 2.

2 is a flowchart illustrating a method of preventing whitening in a wireless communication terminal according to the present invention.

First, when the power is turned on, the device 100 writes detection detection data to the graphics RAM (GRAM) of the display driver integrated circuit (DDI) 19 (201), and reads data from the graphics RAM (GRAM) again (202). ). In this case, in general, an initialization process is performed when the wireless communication terminal is powered on. However, in the present invention, before performing the initialization process, the process of writing and re-reading the whitening detection data to the graphics RAM of the display driver integrated circuit (DDI) 19 is first performed. The reason for this process is to detect whether data is properly written to the graphic RAM. On the other hand, the whitening phenomenon detection data may be any predetermined data, for example, a red rectangle (0xf903) of size 96 × 64 may be used as detection data.

In operation 203, initialization is performed by inputting a predetermined initialization value into an internal register of the display driver integrated circuit (DDI) 19.

Thereafter, the data read from the graphic RAM and the whitening detection data are compared and matched (204), and the value read from the internal register of the display driver integrated circuit (DDI) 19 is preset. The initialization values are compared and checked to see if they match (205). At this time, the process "204" and "205" is a process for checking whether or not whitening phenomenon has occurred.

As a result, if the data read from the graphics RAM and the data of the whitening phenomenon do not match or the value read from the internal register does not match the preset initialization value, the GPIO 10 is used. The display driver integrated circuit (DDI) 19 is hard reset (207), the data read from the graphics RAM (GRAM) and the whitening detection data coincide, and the value of the internal register If the preset initialization value matches, the normal routine is performed (206).

As described above, the apparatus for preventing bleaching according to the present invention writes the bleaching detection data, which is preset before initialization of the display drive integrated circuit (DDI), to the graphic RAM and compares the same. By confirming that data is properly written to the graphics RAM, the occurrence of the whitening phenomenon can be detected.

In addition, the apparatus for preventing bleaching according to the present invention may be applied to various electronic devices including a display device such as a wireless communication terminal, a computer, a camcorder, a digital camera, and an LCD TV.

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 by the drawings.

As described above, when the electronic device having a display device detects the whitening phenomenon of the display device (LCD), the display driver integrated circuit (DDI) is controlled by controlling a general-purpose input / output port (GPIO) connected to the display device (LCD). By hard reset (Hard Reset), it is possible to prevent the whitening phenomenon caused by the timing error at the time of initialization of the display driver integrated circuit (DDI) by software without rebooting.

Claims (5)

delete In the apparatus for preventing bleaching of a wireless communication terminal, Graphic data is received and stored according to the control of the control means, the display means is driven accordingly, and a hard reset signal is received through the general input / output port (GPIO) of the control means. Display driving means for; The display means for being driven by the display driving means to output graphic data; And The control means for transmitting a hard reset signal to the display driving means through the general-purpose input / output port (GPIO) in response to detecting the whitening phenomenon of the display means; Whitening prevention device comprising a. The method of claim 2, The process of detecting the whitening phenomenon by the control means, After writing the whitening detection data preset in the display driving means, reading data from the display driving means, initializing the display driving means using a preset initialization value, and then displaying the display driving means. The apparatus for preventing blemishes, wherein the sensitization phenomenon is detected as the data read in and the preset sensitization detection data do not coincide or the initialization value of the display driving means does not coincide with the preset initialization value. delete In the method of preventing whitening in a wireless communication terminal, A display driving means reading / writing step of writing whitening detection data preset in the display driving means and reading data from the display driving means; An initialization step of initializing the display driving means by using a preset initialization value; A whitening phenomenon detecting step of detecting a whitening phenomenon according to the data read from the display driving means and the predetermined whitening detection data not coincident or the initialization value of the display driving means and a predetermined initialization value do not match; And Hard reset of the display driving means by transmitting a hard reset signal through a general-purpose input / output port (GPIO). Whitening prevention method comprising a.

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