KR100295766B1 - Color graphic lcd interface apparatus of mobile communication terminal - Google Patents

Abstract

The present invention relates to a color graphic liquid crystal display interface device in a portable communication terminal for providing character data and / or image signals to a drive device for driving a color graphic liquid crystal display, the operation program, fonts, and predetermined number of colors. Requesting a mobile communication terminal using a first memory that stores information used to express the information, and text data and / or a number of still picture signals provided by the mobile communication terminal using information stored in the first memory. The external image signal, the character data, and the still image signal on the color graphic liquid crystal display in synchronization with a second memory to be stored as a signal to be stored, and a synchronization signal of an external image signal of the portable communication terminal or a synchronization signal generated therein. Alone or in a specific area of the picture of the external picture and still picture signal. A signal processor for controlling a character to be formed and displayed, and outputting an on-screen display signal corresponding to the stored character data and / or still image of the second memory according to the control; And a selection unit for selectively providing an external image signal applied from the outside and an on-screen display signal provided by the signal processing unit to the driving device.

Description

Color graphic liquid crystal display interface device in mobile communication terminal {COLOR GRAPHIC LCD INTERFACE APPARATUS OF MOBILE COMMUNICATION TERMINAL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to portable communication terminals, and more particularly, to a color graphics liquid crystal display (LCD) interface device for displaying images and characters.

Recently, attention has been paid to services such as data communication and video communication, away from the conventional concept of delivering only voice due to the performance improvement of the mobile communication terminal. For the service of video communication, the LCD also considers the color graphic LCD by moving away from the conventional black and white LCD. Due to the change of LCD, the control device of the communication terminal cannot use the LCD control method as it is.

The use of font roms simply using the indexes used for black and white character LCDs does not play an effective role in color graphic LCDs. In addition, there are various signals added to control the color graphic LCD, such as R, G, B signals, and synchronization signals. If these signals are controlled in the same way as the conventional black and white character LCD control method, various problems occur. In addition, it is almost impossible to use an On Screen Display (OSD) circuit of a TV (TeleVision), which displays characters on-screen on an image, to be applied to a portable communication terminal that requires minimal power consumption.

Accordingly, an object of the present invention is to provide a color graphic liquid crystal display interface device for displaying images and characters in a portable communication terminal.

In accordance with the above object, the present invention provides a color graphic liquid crystal display interface device in a portable communication terminal for providing text data and / or image signals to a driving device for driving a color graphic liquid crystal display.

A first memory for storing an operation program, a font, and information used for expressing a predetermined number of colors;

A second memory for storing the text data and / or the number of still picture signals provided by the portable communication terminal as signals required by the portable communication terminal using information stored in the first memory;

The external image signal, the text data, the still image signal alone or the external image and still image on the color graphic liquid crystal display in synchronization with a synchronization signal of an external image signal of the portable communication terminal or a synchronization signal generated therein. A signal processor for controlling a desired character to be formed and displayed in a specific area of an image of a signal, and outputting an on-screen display signal corresponding to the stored character data and / or still image of the second memory according to the control;

According to the control of the signal processor, an external image signal applied from the outside and the on-screen display signal provided by the signal processor is characterized in that it comprises a selection unit for selectively providing to the drive device.

1 is a block diagram of a color graphics LCD interface device according to an embodiment of the present invention

2 is a view illustrating a connection relationship between a color graphic LCD interface device according to an embodiment of the present invention, a color graphic LCD driver and a color graphic LCD, which are peripheral devices thereof;

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of a color graphic LCD interface device 2 for displaying images and characters in a portable communication terminal according to an embodiment of the present invention, and FIG. 2 is a color graphic LCD interface device 2 of FIG. 4 is a diagram showing a connection relationship between a color graphic LCD driver 4 and a color graphic LCD 6 as peripheral devices.

As shown in FIG. 2, a color graphic LCD driver 4 for driving the color graphic LCD 6 is connected to an output terminal of the color graphic LCD interface device 2, and the color graphic LCD driver 4 of the color graphic LCD interface 4 is connected. The output terminal is connected to a color graphic LCD 6 which displays images and characters.

The color graphic LCD interface device 2 shown in FIG. 1 is connected to a main control device of a mobile phone, which is a representative example of a mobile communication terminal, that is, a mobile station MODEM (MOdulator and DEModulator) (MSM) 10. The MSM 10 performs an overall operation on the mobile phone. Examples of the MSM 10 include MSM2000, MSM2300, MSM3000, and MSM3100 chips produced by the United States 'QUALCOMM Corporation'.

As shown in FIG. 1, a color graphic LCD interface device 2 for displaying images and characters in a portable communication terminal according to an embodiment of the present invention includes an MPU (Main Processing Unit) 22 and an OSD signal processing unit ( 24), program ROM 26, random access memory (RAM) 28, digital-to-analog converter (D / A converter) 32, and multiplexer 32.

The MPU 22 analyzes various commands and data transmitted from the MSM 10 through the OSD signal processor 24 to control the OSD signal processor 24 and the program ROM 26. The program ROM 26 stores an operation program and also stores information on fonts, letters, text colors, background colors, and the like.

Under the control of the MPU 22, the OSD signal processing unit 24 is displayed on the color graphic LCD 6 in synchronization with the color synchronization signal C_sync included in an external image signal applied from the outside, such as a television signal and a camera signal. A desired image is formed in a specific area of an image (external R, G, B signal), or a still image downloaded from a personal computer (PC) on a color graphic LCD 6 (hereinafter referred to as a background image). It displays the display. It also serves to display the character under the control of the MPU 22 on the color graphics LCD (6). The RAM 28 is connected to the OSD signal processor 24, stores several images and also stores data for character generation. The OSD signal processor 24 outputs OSD R, G and B signals and horizontal and color sync signals H / C_sync. The OSD R, G, and B signals may be implemented as, for example, 8-bit digital signals (R: bits, G: 3 bits, B: 2 bits) to represent 256 colors.

A detailed configuration of the OSD signal processor 24 and its operation will be described in detail below. As shown in FIG. 1, the OSD signal processor 24 includes a digital phase locked loop (PLL) 40, a synchronization signal generator 42, a timing generator 44, and a bus 46. have. The synchronizing signal generator 42 generates synchronizing signals such as horizontal and vertical synchronizing signals and color synchronizing signals. In the external image use mode, the synchronizing signal generating unit 42 synchronizes the horizontal and color synchronizing signals H with the external color synchronizing signal external C_sync. / C_sync is generated, and the horizontal and color sync signals H / C_sync are generated internally based on the timing signal provided by the timing generator 44 in the portable communication terminal use mode. The timing generator 44 generates various timing signals based on the clock provided by the MSM 10. The timing signal also includes a selection signal FB applied to the selection terminal of the multiplexer 32. The digital PLL 40 performs phase control to phase-lock the external R, G, and B signals.

The MSM 10, which is an example of the main communication device of the portable communication terminal, controls the OSD signal processor 24 to display images and / or characters on the color graphic LCD 6, and the OSD signal processor 24 for controlling the OSD signal. The interface between the MSMs 10 is as follows.

The OSD signal processing unit 24 transmits and receives data DATA with the MSM 10 through, for example, an 8-bit data line, and transmits an address AO, a write signal WR, a chip select signal CS, a reset signal / RESET, and the like from the MSM 10. It receives a clock of 27MHz. Then, under the control of the MSM 10, a mobile phone battery power source BATT (e.g., a 3.3V power supply) connected to the collector terminal of the transistor 14 is supplied. The emitter terminal of the transistor 14 is grounded and the base terminal is connected to the control port of the MSM 10. Accordingly, the OSD signal processor 24 may be powered on and off according to power control of the MSM 10 using the control port. Such power control prevents unnecessary power consumption of the portable communication terminal battery.

On the other hand, the multiplexer 32 is always operated by receiving the battery power BATT, the external R, G, B signal applied from the outside and the OSD R, G, B signal D / A converted in the D / A converter 30 On the basis of the selection signal FB output from the OSD signal processing section 24, it is outputted to the color graphic LCD driver 4 as an alternative. The OSD R, G, and B signals applied to the multiplexer 32 are determined to be in an analog form or a digital form according to the signal input form of the color graphic LCD 6, which is an embodiment of the present invention. In FIG. 1, the OSD R, G, and B signals are applied to the multiplexer 32 in an analog form. Accordingly, the D / A converter 30 is provided at the output terminal of the OSD signal processor 24. If the input form of the graphic color LCD 6 is digital, the D / A converter 30 of FIG. 1 will be omitted.

The predetermined R, G, and B signals output from the multiplexer 32 and the horizontal and color synchronization signals H / C_sync output from the OSD signal processor 24 are applied to the color graphic LCD driver 4. In order to express a desired character in a predetermined area of an image to be displayed on the color graphic LCD 6 of FIG. 2, the image signal selected by the multiplexer 32 must be synchronized with the horizontal and color synchronization signals H /. C_sync is provided to the color graphic LCD driver 4.

The color graphic LCD driver 4 of FIG. 2 uses the horizontal and color synchronization signals H / C_sync and the predetermined R, G, B signals selected from the multiplexer 32 output from the OSD signal processor 24 of FIG. Displays images and / or characters on the color graphics LCD 6.

The operation according to the color graphic LCD interface 2 of the present invention will be described in more detail as follows.

The MSM 10, which is an example of the main controller of the portable communication terminal, can download still images from the PC through the RS232C interface normally installed in the portable communication terminal. When the still image is downloaded by a user and the still image is to be displayed on the color graphic LCD 6 as the background image, the MSM 10 controls the OSD signal processor 24 to control the OSD signal processor ( The downloaded image (background image) is stored in the RAM 28 connected to 24.

In addition, the MSM 10 controls the OSD signal processor 24 to display and display text on an external image (image by external R, G, B signals) on the color graphic LCD 6 and display the text. Also, the OSD signal processor 24 is controlled to display characters on the background screen and display them on the color graphic LCD 6. In addition, the OSD signal processor 24 is controlled so that only the external image, only the background screen, or only the characters controlled by the controller of the mobile communication terminal are displayed on the color graphic LCD 6.

First, when the MSM 10, which is a mobile phone controller, applies various commands and data to the OSD signal processor 24 to display a desired character on the color LCD 6, the MPU 22 transmits the OSD signal to the OSD signal processor 24. It interprets various authorized commands and data to determine what action to perform and controls peripheral parts to perform the action accordingly. More specifically, when the MPU 22 reads the font from the ROM 26 using the interpreted data and transfers the font to the OSD signal processor 24, the OSD signal processor 24 displays the character corresponding to the font. The data is stored in a predetermined position of the RAM 28. At this time, information of a letter shape, a text color, and a background color is read from the ROM 26 according to various commands interpreted by the MPU 22, and the OSD signal processor 24 matches the characters stored in the RAM 28 with the information. To be configured. The RAM 28 constitutes one page of characters.

One page of characters configured in the RAM 28 are transferred to the color graphic LCD driver 4 through the D / A converter 30 and the multiplexer 32 under the control of the OSD signal processor 24. It is displayed on the color graphic LCD 6.

If the user controls the OSD signal processing unit 24 to display the background image desired by the user using the MSM (10) mobile phone control device, the OSD signal processing unit 24 is the command and data of the MPU (22) According to the analysis, the background image data provided by the MSM 10 is stored in the RAM 28. Thereafter, in response to the vertical and color synchronization signals H / C_sync generated by the internal synchronization signal generator 42, the background image data read from the RAM 28 is multiplexed through the D / A converter 30. ), And outputs a selection signal FB for causing the multiplex seat 32 to select the OSD R, G, and B signals. Accordingly, the multiplexer 32 selects the OSD R, G, and B signals of the background screen to which the input terminal B is applied, and outputs the color graphics LCD driver 4 to the color graphic LCD driver 4. 6) The image of the background screen is displayed on the screen.

In addition, when the user controls the OSD signal processing unit 24 to be displayed on the color graphics LCD 6 by inserting a character on the desired background screen using the mobile phone control device MSM (10), the OSD signal processing unit 24 is MPU (22) The background data provided by the MSM 10 is stored in the RAM 28 according to the command and data interpretation of the), and the character data is overwritten in the storage location of the RAM 28 corresponding to the character to be inserted. . Thereafter, in response to the vertical and color synchronization signals H / C_sync generated by the internal synchronization signal generator 42, the background data and the character data read from the RAM 28 are multiplexed through the D / A converter 30. It is applied to the document 32, and outputs the selection signal FB which causes the multiplexer 32 to select the OSD R, G, and B signals. Accordingly, the multiplexer 32 selects the OSD R, G, and B signals of the background image and the character to which the input terminal B is applied and outputs them to the color graphic LCD driver 4, and the color graphic LCD driver 4 is a color graphic. The background image and the image of the character are displayed on the LCD 6.

On the other hand, the external R, G, B signals applied to one input terminal of the multiplexer 32 from the outside may be a video signal such as a television signal and a camera signal output from a digital still camera, or may be an external still image signal.

When an external image signal (external R, G, B signals) is applied, the OSD signal processing unit 24 controlled by the portable communication terminal device synchronizes with the external color synchronization signal C_sync so that the external image signal is displayed in the color graphic LCD 6. To be displayed on the screen. That is, the selection signal FB is output so that the external image signal can be selected in synchronization with the external color synchronization signal C_sync. Accordingly, the multiplexer 32 selects the external R, G, and B signals applied through the input terminal A, outputs them to the color graphic LCD driver 4, and controls the color graphics by driving control of the color graphic LCD driver 4. An external image is displayed on the LCD 6.

When a character is to be displayed in a specific area of the image under the control of the MSM 10 while the external image is being displayed on the color graphic LCD 6, the following operation is performed. The OSD signal processor 24 under the control of the MSM 10 stores the characters to be displayed on-screen in the RAM 28. At the timing of selecting the external image signal in synchronization with the color synchronization signal C_sync applied from the outside, the selection signal FB is outputted so that the external image signal is selected, and the character output from the OSD signal processor 24 is selected at the timing of selecting the character. Output the selection signal FB to be selected. Accordingly, the multiplexer 32 selects the external R, G, B signals applied through the input terminal A at the timing of selecting the external image signal, and outputs them to the color graphic LCD driver 4, and at the timing at which the character selects the input terminal. An OSD R, G, B signal applied through B is selected and output to the color graphic LCD driver 4. Since the color graphic LCD driver 4 performs the driving control of the color graphic LCD 6 accordingly, characters are displayed on the screen on an external image on the color graphic LCD 6.

In the above description of the present invention, specific embodiments have been described, but various modifications can be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be defined by the claims and equivalents of the claims.

As described above, since the present invention implements a color graphic LCD interface device for a mobile communication terminal, there is an advantage of displaying various images and characters on a color graphic LCD.

Claims (1)

A color graphic liquid crystal display interface device in a portable communication terminal for providing text data and / or image signals to a driving device for driving a color graphic liquid crystal display, A first memory for storing an operation program, a font, and information used for expressing a predetermined number of colors; A second memory for storing the text data and / or the number of still picture signals provided by the portable communication terminal as signals required by the portable communication terminal using information stored in the first memory; The external image signal, the text data, the still image signal alone or the external image and still image on the color graphic liquid crystal display in synchronization with a synchronization signal of an external image signal of the portable communication terminal or a synchronization signal generated therein. A signal processor for controlling a desired character to be formed and displayed in a specific area of an image of a signal, and outputting an on-screen display signal corresponding to the stored character data and / or still image of the second memory according to the control; And a selection unit for selectively providing an external image signal applied from the outside and an on-screen display signal provided by the signal processing unit to the driving device under the control of the signal processing unit.