KR100606843B1 - Apparatus of LCD interface and Method of the same - Google Patents

Abstract

The present invention relates to an LCD interface device and method for an LCD interface. According to an aspect of the present invention, there is provided an LCD interface apparatus for displaying image processed data on various LCDs, comprising: a register unit for storing control information for the LCD and an interface, and an image processor for generating the stored control information and a synchronization signal related to the data; It provides a LCD interface device comprising a display controller for displaying the image data on the LCD using the synchronization information of the image received from the. Therefore, there is no need to use a separate processor and DSP for the LCD interface to prevent the increase in gate size and power consumption, and the flexible structure has the effect of supporting various types of LCDs.

LCD Interface, Registers, Display Controller, LCD

Description

LCD interface device and method {Apparatus of LCD interface and Method of the same}

1 is a block diagram showing the configuration of a general mobile reception DMB system

2 is a block diagram showing a configuration of an LCD interface device according to the present invention.

3 is a view showing an operation relationship of the LCD interface device according to the present invention

4 illustrates an LCD interface timing relationship according to the present invention.

-Explanation of symbols for the main parts of the drawing-

100: register unit 200: display controller

300: LCD

The present invention relates to an LCD interface, and more particularly, to an LCD interface device and method for displaying an image signal output from a digital multimedia broadcasting (DMB) receiving chip on various LCDs.

Digital Multimedia Braodcasting (DMB) is a digital broadcast capable of mobile reception, and its main purpose is to receive digital television broadcasts from portable digital devices such as mobile phones and PDAs. The configuration of such a general mobile reception DMB system is shown in FIG.

As shown in FIG. 1, the DMB receiving system for mobile reception includes a mobile chipset 10 that performs various functions necessary for a mobile phone as well as a function of a general processor to perform overall mobile phone control, and the mobile chipset 10. And a DMB receiving chip 20 which receives an output image of the C-type image and a DMB image from the outside and displays the decoded image on the LCD (Liquid Crystal Display) 30.

Therefore, the general mobile phone screen and the DMB video screen are displayed on the LCD screen 30. The DMB receiving chip 20 has a dedicated DSP (Digital Signal Processing) internally for such a receiving function and decoding.

As such, in order to display an image on the LCD 30, a means for interfacing with various types of LCDs should be provided.

However, LCDs currently used in mobile phones transmit video data in a format similar to memory access, and these data transmission formats are not unified and are different for each LCD manufacturer.

Therefore, in order to transmit data to the LCD, the LCD interface is implemented by using a separate LCD interface processor inside the DMB receiving chip 20, which changes various types of LCD and interfaces by changing only a software program. Because you can.

However, when the processor is used as described above, the gate size of the DMB receiving chip is increased, and accordingly, the power consumption of the receiving chip is also increased. In other words, using a separate processor for the LCD interface is more expensive than profit.

In addition, a method of using a DSP already installed in the DMB receiving chip 20 for an LCD interface may be considered. However, this method puts a lot of burden on the DSP, thus reducing the performance of the DMB receiving chip 20. It is a factor to make.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a hardware LCD interface device and method having flexibility to interface with various types of LCD.

In order to achieve the above object, the present invention provides an LCD interface device for displaying image processed data on various LCDs, comprising: a register unit for storing control information for interfacing with the LCD, and associated control information and the stored data; And a display controller which displays the image processed data on the LCD using the synchronization information of the image received from the image processing unit in which the synchronization signal is generated.

In this case, the register unit in which the control information is stored may include a plurality of registers in which a start command and an end command respectively corresponding to a selected LCD among the various LCDs are stored, a register in which a number of the start command and an end command are stored, and the start command and It is preferable that the register is configured to store the A0 signal corresponding to the end command.

The start command is a command for designating a start position of the image data and the size of an image, the end command is a command for designating a last position of the image data, and the A0 signal is used to distinguish between an address cycle and a data cycle. Characterized in that the signal.

In addition, the synchronization information received from the image processing unit includes a horizontal (HSYNC) and vertical synchronization signal (VSYNC) of the image, a vertical synchronization signal (VSYNC_1p) that occurs one horizontal synchronization signal interval earlier than the vertical synchronization signal, and the vertical It is characterized in that the vertical synchronization signal (VSYNC_1d) which occurs one horizontal synchronization signal interval later than the synchronization signal.

The section in which VSYNC_1p is 1 and VSYNC is 0 is a start command transmission section, the section in which VSYNC is 1 is a video data transmission section, and the section in which VSYNC is 0 and VSYNC_1d is 1 is an end command transmission section. .

In the LCD interface method for displaying the image-processed data according to the present invention on a variety of LCD, the type and number of start and end commands that are control information of the LCD for the selected one of the various LCD, the A0 And storing the image processed data on the LCD using the stored control information and the synchronization information of the image received from the image processing unit in which the synchronization signal related to the data is generated. It is characterized by.

Therefore, according to the present invention, there is no need to use a separate processor or DSP for the LCD interface, thereby preventing gate size increase and power consumption, and supporting various types of LCDs with a flexible structure.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described.

2 is a block diagram illustrating an LCD interface device according to the present invention.

As shown in FIG. 2, the LCD interface device according to the present invention includes a register unit 100 for storing a start command and an end command as control information in a DMB receiving chip for interfacing with the LCD 300, and receiving a DMB. And an LCD display controller 200 configured to receive image data and sync information from an image processor of the chip and display the same on the LCD.

The register unit 100 includes a plurality of registers 0 to n-1 for storing start and end instructions, a register for designating the number of start and end instructions, and the start and end instructions. It consists of a register that provides the state of the A0 pin.

The start command is a command for transmitting the start of every frame of an image to the LCD 300. The start command is a command for specifying a start position of the image data and a size of the image. In addition, the end command is a command for transmitting the end of every frame of the image to the LCD 300 to designate the last position of the image data.

The register designating the number of the start command and the end command designates the number of the start command and the end command, respectively, and the register providing the state of the A0 pin designates the state of the A0 pin corresponding to the start command and the end command. . As will be described later, the A0 signal provided by the A0 pin is a signal for distinguishing an address cycle and a data cycle.

The register unit 100 is controlled by the central processing unit (CPU) inside the DMB receiving chip through a host bus.

The LCD display controller 200 receives a synchronization signal and RGB data from an image processor in the DMB receiving chip and displays the LCD signal at the timing provided by the register 100.

An operation relationship of the LCD interface device according to the present invention having such a configuration will be described in detail with reference to the accompanying drawings.

FIG. 3 is a diagram illustrating an operation relationship of the LCD interface device according to the present invention, and illustrates an example of displaying one frame of an image.

As shown in FIG. 3, the VSYNC signal transmitted from the image processor to the LCD display controller 200 according to the present invention represents a vertical synchronization signal of an image frame, and the HSYNC signal represents a horizontal synchronization signal of an image. In addition, VSYNC_1p is a signal generated 1HSYNC earlier than VSYNC, and VSYNC_1d is a signal generated 1HSYNC later than VSYNC. In addition, the RGB_DATA [15: 0] signal is a signal to which RGB 565 type (16 bit) video data is transferred.

Such image data is transmitted to the LCD every frame. Therefore, the figure shown in FIG. 3 shows one frame of the image, and the same operation as that of FIG. 3 is repeated every frame.

The LCD interface according to the present invention operates to transmit data corresponding to each section by distinguishing a command provided from the register unit 100 and a time for transmitting image data. That is, at the time of system initialization, the register unit 100 is configured according to the data transmission format according to the LCD manufacturer, and data corresponding to each section is provided according to a command provided through the register unit 100. To send.

Therefore, as shown in FIG. 3, the section in which VSYNC_1p is 1 and the VSYNC is 0 is a start command transmission section, and the section in which VSYNC is 1 is an RGB image data transmission section. In addition, a section in which VSYNC is 0 and VSYNC_1d is 1 is an end command transmission section.

The start command transmission section is a section for transmitting commands to be transmitted to the LCD prior to the transmission of the RGB image data.

In the start command transmission section, the start position and size of the image data are mainly transmitted. In this section, the display controller 200 reads as many start commands and corresponding A0 registers as the values stored in the start command number register of the register unit 100 and transmits them to the LCD at timing. The LCD interface timing is illustrated in the accompanying FIG. 4, and the timing relationship is described below with reference to FIG. 4.

4 illustrates an LCD interface timing relationship according to the present invention.

As shown in FIG. 4, the LCD interface is similar to that of a general SRAM. In other words, when cs and wr are driven and data is driven, the data is written to the corresponding address.

However, the difference with a typical SRAM is that there is only one address pin. Thus, two cycles are required to access any address. There is an A0 signal to distinguish between this address cycle and the data cycle.

The A0 signal is also referred to as ADS. If the signal is 0, it indicates an address cycle, and if it is 1, it is a data cycle. The distinction between the address cycle and the data cycle can be set, so that 1 can be set to an address cycle and 0 to be a data cycle.

In this address cycle section, an address to which information such as a start position and size of image data corresponding to a start command is to be recorded is indicated in the address cycle section. The start position of the video data section in the next data cycle section. And information such as size. This cycle will be repeated by the number of start commands.

Meanwhile, the attached RGB image data transmission section of FIG. 3 is a section delivering image data to the LCD. In this section, the display controller 200 adjusts the RGB data transmitted from the image processor to the same timing as in FIG. To transmit. The A0 signal at this time is set to 1 indicating that it is a data cycle to transmit data.

Also, the end command transmission section of FIG. 3 is a section for transmitting commands to be transmitted to the LCD after data transmission.

In the interval, the display controller 200 reads the end command and the corresponding A0 register corresponding to the value stored in the end command number register of the register unit 100 and transmits the same to the LCD.

In this case as well, the signal is transmitted according to the timing shown in FIG. 4, and the address where the data such as the last position of the image according to the end command is recorded is transmitted in the address cycle section in which the A0 signal is 0, and the next A0 signal is 1 In the data cycle section, data such as the last position of the image according to the end command is transmitted to be recorded at the address.

As described above, the video is displayed on the LCD 300 by repeating the operation of FIG. 3 every frame.

On the other hand, as mentioned above, since the type of LCD and its interface vary, it is only necessary to set the start command register, the end command register, the command number register, etc. according to the selected LCD to support various types of LCDs. In other words, even if the number of commands, the configuration of the command itself, and the value of A0 according to each LCD, it can support all of them.

The present invention is not limited to the above-described embodiments, and as can be seen in the appended claims, modifications can be made by those skilled in the art to which the invention pertains, and such modifications are within the scope of the present invention.

The effects of the LCD interface device and method according to the present invention described above are as follows.

First, by proposing a hardware device that can interface with various types of LCDs without using a DSP inside the DMB receiver chip or a dedicated display processor, the gate size increases and power consumption is prevented.                     

Second, the LCD interface device according to the present invention has a flexible structure to support various types of LCD.

Claims (4)

In the LCD interface device for displaying the processed data on a variety of LCD (Liquid Crystal Display), A register unit for storing control information for interfacing with the LCD; And a display controller configured to display the image processed data on the LCD by using the stored control information and the synchronization information of the image received from the image processor which generates the synchronization signal related to the data. . The register unit of claim 1, wherein the register unit, in which the control information is stored, A plurality of registers each having a start command and an end command corresponding to a selected LCD among the various LCDs, a register storing a number of the start command and an end command, and a register storing an A0 signal corresponding to the start command and end command, respectively LCD interface device, characterized in that consisting of. The method of claim 1, wherein the synchronization information received from the image processing unit, Horizontal (HSYNC) and vertical sync signal (VSYNC) of the image, A vertical synchronizing signal VSYNC_1p which occurs one horizontal synchronizing signal section before the vertical synchronizing signal; And a vertical synchronizing signal (VSYNC_1d) which occurs one horizontal synchronizing signal section later than the vertical synchronizing signal. In the LCD interface method for displaying the imaged data on various LCD (Liquid Crystal Display), Determining the type and number of start and end commands, which are control information of the LCD, for one selected LCD among the various LCDs, and storing the related A0 signal in a register; And displaying the processed image on the LCD by using the stored control information and the synchronization information of the image received from the image processing unit generating the synchronization signal related to the data.

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