KR100516065B1 - High resolution liquid crystal display device and method thereof for enlarged display of low resolution image data - Google Patents

Abstract

A high resolution liquid crystal display device and a method for displaying the low resolution image data in an enlarged manner are disclosed. The high resolution liquid crystal display device includes a liquid crystal display controller for receiving low resolution image data and control signals from a low resolution VGA card and outputting image data and control signals necessary for enlargement. The image data necessary for enlargement is output as line data of Y (Y is a natural number less than X) or more line data during X (X is a natural number) horizontal synchronizing signals. The source driver which receives the image data applies the Y or more line data to the data signal line of the liquid crystal panel during the X horizontal synchronization signals. At this time, since the gate driver drives the scanning line of the liquid crystal panel for each horizontal synchronization signal, the low resolution screen displayed on the liquid crystal panel is enlarged and displayed at least 1 times. Therefore, the whole display screen is used efficiently, and visibility is also improved.

Description

High resolution liquid crystal display device and method thereof for enlarged display of low resolution image data

The present invention relates to a high resolution liquid crystal display device, and more particularly, to a high resolution liquid crystal display device and a method for enlarging and displaying a screen corresponding to low resolution image data.

In general, a liquid crystal display device, which is a type of flat panel display device, uses characteristics of a liquid crystal in which light transmittance changes according to a voltage, and can be driven at a low voltage, consumes little power, generates no electromagnetic waves, and secures space. It is easy and widely used.

In particular, with the development of technology, the manufacturing technology of the liquid crystal display device has also advanced, resulting in the appearance of a high resolution liquid crystal display device monitor like the cathode ray tube monitor.

These high-resolution liquid crystal display monitors should support almost all VGA cards. There is no problem in receiving and displaying image data from VGA cards displaying a high resolution video mode.However, unlike cathode ray tube monitors, liquid crystal display monitors Since it operates in a pixel concept, a problem occurs when displaying image data from a VGA card displaying a low resolution video mode.

That is, since only the screen corresponding to the predetermined pixel of the low resolution video mode is displayed, the size of the displayed screen is reduced. For example, when image data of an 800 × 600 video mode is input to a liquid crystal display monitor having a resolution of 1600 × 1200, the display is only displayed as a size of 1/4 of the screen.

As a result, a smaller screen among the larger screens of the high-resolution liquid crystal display monitor has a considerable disadvantage in terms of visibility.

Accordingly, an object of the present invention is to solve the above-mentioned problems. A low-resolution image which efficiently uses the entire display screen and improves visibility by enlarging the low-resolution image data by more than 1 times and displaying it on the screen. The present invention provides a high-resolution liquid crystal display device and a method for expanding and displaying data.

In order to achieve the above object, the present invention is characterized in that one or more line data of low resolution image data is displayed on a plurality of lines of a liquid crystal panel displaying image data, thereby enlarging the screen displayed by the low resolution image data.

The present invention provides a frame memory unit for receiving and storing low-resolution image data and outputting at least Y (Y is a natural number less than X) line data among the image data during X (X is a natural number) horizontal synchronization signal, and a frame memory unit. And a source driver configured to receive line data output from the at least one line data and output the at least Y line data during the X horizontal synchronization signals.

Here, the low resolution image data is input from a low resolution VGA card or the like mounted on an external computer main body or the like.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention may be easily implemented by those skilled in the art with reference to the accompanying drawings.

Fig. 1 is a block diagram of a high resolution liquid crystal display device displaying enlarged low resolution image data according to an embodiment of the present invention.

As shown in FIG. 1, a high-resolution liquid crystal display device which enlarges and displays low-resolution image data according to an exemplary embodiment of the present invention receives the low-resolution image data and the control signal from the low-resolution VGA card 101 of the computer main body 10 and enlarges them. And a high resolution liquid crystal display device 20 to display.

Here, the high resolution liquid crystal display device 20 includes a liquid crystal display controller 200 for receiving image data and control signals from the low resolution VGA card 101 and outputting data and control signals for screen enlargement, and a liquid crystal display controller. The source driver 210 driving the signal line of the liquid crystal panel 230 by receiving the data and the control signal output from the 200, and the liquid crystal panel 230 by receiving the control signal output from the liquid crystal display controller 200. And a gate driver 220 to drive the scan line.

Here, the liquid crystal display controller 200 receives a control signal output from the low resolution VGA card 101 and outputs the control signal to the source driver 210 and the gate driver 220 for outputting various control signals for screen enlargement. The frame memory which receives the image data output from the controller 203 and the low resolution VGA card 101, receives the control signal output from the timing controller 203, and outputs data for screen enlargement to the source driver 210. The unit 201 is included.

Hereinafter, a method of enlarging and displaying low resolution image data in the high resolution liquid crystal display according to the first embodiment of the present invention will be described with reference to FIG. 2.

First, the low resolution VGA card 101 of the computer main unit 10 is associated with image data to be displayed on the high resolution liquid crystal display 20 from a microcontroller (not shown) that controls the overall operation of the computer main unit 10. The control signal is input and output to the high resolution liquid crystal display 20.

At this time, the image data output from the low resolution VGA card 101 is output to the frame memory unit 201 of the liquid crystal display control unit 200 as color R (Red), G (Green), and B (Blue) data.

The frame memory unit 201 is a memory having a first in first out (FIFO) structure and stores RGB data corresponding to one frame displayed on the liquid crystal panel 230, and then controls the timing controller 203. As a result, the data is output to the source driver 210.

On the other hand, control signals output from the low resolution VGA card 101 include a vertical sync signal VSYNC, a horizontal sync signal HSYNC, a data enable signal DE, a clock CLOCK, and the like.

The timing controller 203 receives the control signals from the low resolution VGA card 101 to generate various control signals for enlarging the low resolution RGB data and displaying them on the liquid crystal panel 230.

First, as shown in FIG. 2, the timing controller 203 is a memory lead for outputting RGB data stored in the frame memory unit 201 only once during two horizontal synchronizing signals (HSYNC) 2h. A memory read enable signal RE is output to the frame memory unit 201.

The memory read enable signal RE is output at a high level from the first horizontal synchronizing signal HSYNC of the two horizontal synchronizing signals 2h so that the RGB data stored in the frame memory unit 201 is stored in the source driver 210. ) To be output at a low level in the second horizontal synchronization signal HSYNC to prohibit RGB data output from the frame memory unit 201.

On the other hand, the amount of memory output during the two horizontal synchronization signals 2h from the frame memory unit 201 to the source driver 210 is an amount capable of displaying one line of the screen to be displayed.

As a result, RGB data corresponding to one line is output to the source driver 210 during the two horizontal synchronization signals 2h, and this operation is repeated to correspond to one frame stored in the frame memory unit 201. All data is transferred to the source driver 210.

As shown in Fig. 2, the RGB data of the n-1th line is first outputted by repeating the two horizontal synchronizing signals 2h, followed by the data of the nth line, n + 1th line, and n + 2th line. Are output continuously.

The source driver 210 includes a line memory (not shown) that stores RGB data corresponding to one line output during the two horizontal synchronization signals 2h from the frame memory unit 201.

Meanwhile, the timing controller 203 generates an STH (StarT Horisontal) signal in synchronization with the generation of the first horizontal sync signal HSYNC of the memory read enable signal RE, and outputs it to the line memory of the source driver 210. The line memory stores RGB data corresponding to each line output from the frame memory unit 201 by this STH signal.

Similarly, in the line memory, RGB data corresponding to one line is stored during two horizontal synchronizing signals 2h, and when new two horizontal synchronizing signals 2h are started, RGB data corresponding to the line following the previous line is stored. It is newly stored in the previously stored line memory.

The TP signal, which occurs one horizontal sync signal (HSYNC) later than the STH signal, is generated by the timing controller 203 and output to the source driver 210.

That is, the TP signal generated when the second horizontal synchronization signal of the two horizontal synchronization signals 2h is generated is output to the source driver 210.

The TP signal is a command signal for applying RGB data stored in the line memory of the source driver 210 to the liquid crystal panel 230.

As a result, when the TP signal is input from the timing controller 203, the line memory applies the stored RGB data to the data signal line of the liquid crystal panel 230.

As shown in FIG. 2, after the n-1th line data is applied to the data signal line of the liquid crystal panel 230 during the two horizontal synchronization signals 2h, the next line n during the next two horizontal synchronization signals 2h. After the first line data is applied, n + 1th line data and n + 2th line data are continuously applied.

Meanwhile, the gate driver 220 driving the scan line of the liquid crystal panel 230 according to the control signal output from the timing controller 203 drives one scan line during one horizontal synchronizing signal 1h as in the related art.

That is, if the scanning line of the m-th line is driven during one horizontal synchronizing signal 1h, the scanning line of the m + 1th line is driven during the next horizontal synchronizing signal 1h, until all the frames are displayed. The scan line of the next line is driven.

As a result, when the operation of the source driver 210 and the operation of the gate driver 220 are combined, as shown in FIG. 2, the source driver 210 outputs the n−1 th line data to two horizontal synchronization signals 2h. The gate driver 220 drives the scan line of the m + 1th line during the first horizontal synchronization signal 1h of the two horizontal synchronization signals 2h while applying the data signal line to the data signal line. The n-1th line data is displayed on the + 1th line, and the m + of the liquid crystal panel 230 is driven during the next second horizontal synchronization signal 1h because the gate driver 220 drives the scan line of the m + 2th line. The n-1th line data is displayed on the 2nd line.

Similarly, the n-th line data is displayed on the m + 3 and m + 4th lines of the liquid crystal panel 230, and the n + 1th line data is displayed on the m + 5 and m + 6th lines.

Accordingly, the screen displayed on the liquid crystal panel 230 in the low resolution video mode is enlarged and displayed twice as much as the screen displayed on the liquid crystal panel in the low resolution video mode.

As a result, by applying one line data to the data signal line of the liquid crystal panel 230 during the two horizontal synchronizing signals 2h in the low resolution video mode, the screen displayed in the low resolution video mode is doubled.

Hereinafter, a method of enlarging and displaying low resolution image data in the high resolution liquid crystal display according to the second embodiment of the present invention will be described with reference to FIG. 3.

As in the first embodiment, the timing controller 203 outputs a memory read enable (RE) signal to the frame memory unit 201 to enable output of RGB line data from the frame memory unit 201 to the source driver 210. Unlike the first embodiment, one memory read enable signal RE is applied during the three horizontal synchronization signals 3h.

The memory read enable signal RE is output at a high level from the first second horizontal synchronization signal 2h of the three horizontal synchronization signals 3h to correspond to two lines stored in the frame memory unit 201. The RGB data is continuously output to the source driver 210, and is output at a low level in the third horizontal synchronization signal 1h to prohibit the RGB data output from the frame memory unit 201.

The signal for storing the RGB data output from the frame memory unit 201 in the line memory of the source driver 210 is STH. Unlike the first embodiment, the first horizontal synchronization signal of the memory read enable signal RE is different from the first embodiment. When generated, one STH signal is generated so that one line data is stored in the line memory, and when the next second horizontal synchronization signal is generated, another STH signal is generated and the next line data is stored in the line memory.

The stored line data is output by the TP signal, and the timing controller 203 generates the TP signal later than the STH signal by one horizontal synchronization signal and outputs the signal to the source driver 210.

As shown in FIG. 3, after the n−1 and n th line data are applied to the data signal line of the liquid crystal panel 230 during the three horizontal synchronization signals 3h, the next line during the next three horizontal synchronization signals 3h. N + 1, n + 2th line data is applied, and then n + 3, n + 4th line data is continuously applied.

Eventually, two line data is applied to the data signal line during the three horizontal synchronizing signals 3h, but the first double line data is applied only during one horizontal synchronizing signal, and the next second line data is applied during the two horizontal simultaneous signals. Is approved.

On the other hand, since the gate driver 220 sequentially drives the line scan line of the liquid crystal panel 230, line data applied from the source driver 210 to the data signal line of the liquid crystal panel 230 is applied to the scan line of the liquid crystal panel 230. Is displayed.

As shown in FIG. 3, while the source driver 210 applies the n−1 th line data to the data signal line during one horizontal synchronization signal, the gate driver 220 is the m + 1 th position of the liquid crystal panel 230. Since the scan line of the line is driven, the n-1th line data is displayed on the m + 1th line, and the gate driver (i.e., the source driver 210 applies the nth line data to the data signal line during the two horizontal synchronization signals). Since the 220 drives the scan lines of the m + 2 and m + 3th lines, the nth line data is displayed on the m + 2 and m + 3th lines of the liquid crystal panel 230.

Similarly, n + 1th line data is displayed on the m + 4th line of the liquid crystal panel 230, and n + 2th line data is displayed on the m + 5, m + 6th line.

As such, one line data is displayed on one of the three lines of the liquid crystal panel 230 and one line data is displayed on the other two lines, so that the line data is displayed on the liquid crystal panel 230 in the low resolution video mode. In the low resolution video mode, the screen is enlarged by 1.5 times than the screen displayed on a general liquid crystal panel.

As a result, by applying two line data to the data signal line of the liquid crystal panel 230 during the three horizontal synchronizing signals 3h in the low resolution video mode, the screen displayed in the low resolution video mode is enlarged to 1.5 times.

As described above, in the embodiment of the present invention, low-resolution image data can be enlarged and displayed by adjusting the number of horizontal synchronization signals and the number of line data and applying them to the data signal lines of the liquid crystal panel, thereby efficiently displaying the entire display screen. It is possible to provide a low resolution image data enlarged display method of a high resolution liquid crystal display device which is used in the present invention and also improves visibility.

Although this invention has been described with reference to the most practical and preferred embodiments, the invention is not limited to the embodiments disclosed above, but also includes various modifications and equivalents within the scope of the following claims.

1 is a block diagram of a high resolution liquid crystal display device for enlarging and displaying low resolution image data according to an embodiment of the present invention;

FIG. 2 is a timing diagram of a high resolution liquid crystal display device which enlarges and displays low resolution image data according to a first embodiment of the present invention.

FIG. 3 is a timing diagram of a high resolution liquid crystal display device which enlarges and displays low resolution image data according to a second embodiment of the present invention.

Claims (4)

The liquid crystal panel which displays a screen, Receiving a low-resolution image-related control signal from the outside and outputting various control signals for screen expansion including a horizontal synchronization signal; receiving low-resolution image data from the outside and receiving a control signal output from the timing controller; A liquid crystal display control unit including a frame memory unit for outputting Y (Y is a natural number) line data during X (X is a natural number) horizontal synchronization signals; A source driver which receives the image data and the control signal output from the liquid crystal display controller and applies the Y line data to the liquid crystal panel during the X horizontal synchronization signals; A gate driver which receives a control signal output from the liquid crystal display controller and drives a scan line of the liquid crystal panel High resolution liquid crystal display comprising a. The method of claim 1, And wherein X is 2 and Y is 1. The method of claim 1, And wherein X is 3 and Y is 2. 3. In the method for enlarging and displaying low resolution image data in a high resolution liquid crystal display device, And Y (Y is a natural number less than the X) of the low resolution image data to the high-resolution liquid crystal display device during X (X is a natural number) horizontal synchronization signals.