KR100194660B1 - LCD control that can magnify images - Google Patents

Abstract

The present invention relates to a liquid crystal display controller for a liquid crystal (LCD) TV capable of zoom-in.

A configuration of the present invention includes a clock generation circuit that receives an external clock and generates a first clock signal and a second clock; A horizontal decoder and counter for receiving a first clock and a video signal of the clock generation circuit and outputting horizontal valid video data; A vertical decoder and counter for receiving the second clock and outputting vertically valid video data; It consists of control circuit that outputs vertical and horizontal start signal and conversion signal to user's control data.

The effect of the present invention is that the sampling method of the liquid crystal controller can be selectively selected, and the image can be easily enlarged by a certain number of times in the vertical and horizontal directions, thereby increasing the diversity of the display function and providing the user with a small screen to instantly enlarge the necessary portion. .

Description

LCD control that can magnify images

1 is a video waveform diagram of a single scan line according to an embodiment of the present invention,

2 is a video waveform diagram of a television scanning line according to an embodiment of the present invention,

3 is a position diagram of a screen for sampling and expanding an image according to a specific embodiment of the present invention.

4 is a configuration diagram of a liquid crystal controller capable of magnifying an image according to an embodiment of the present invention.

5 is a block diagram of generating a horizontal and vertical conversion clock signal by selecting from a normal clock and a clock twice as fast according to an embodiment of the present invention,

6 is a block diagram of generating a start signal for a source driver for a horizontal start signal according to an embodiment of the present invention.

7 is a configuration for generating a start signal for the common driver for the vertical start signal according to an embodiment of the present invention.

The present invention relates to a liquid crystal controller capable of image magnification, and more particularly, to a liquid crystal display controller for liquid crystal (LCD) TVs capable of image magnification (ZOOM-IN) by increasing the sampling rate by a certain factor.

The zoom function of a camera device, such as a conventional video camera, is a function only for shooting, and it is difficult to display the image while zooming in once. It requires integrated circuits and algorithms. In addition, LCD televisions have a mechanism for displaying video data on a liquid crystal after sampling. Since LCD panels are expensive, most screen sizes are about 3 inches, 4 inches, and 5 inches. There is a problem that you can not see a large screen because it has a size within inches. In other words, there is a problem in that it is not possible to easily magnify an image through a conventional method of displaying a liquid crystal.

An object of the present invention is to solve the above-mentioned problems, and by simply selecting the sampling method of the liquid crystal controller, the user simply enlarges the image by 2 times in both horizontal and vertical directions, thereby bringing a variety of display functions and increasing the added value of the product. It is to provide a function that allows a user to instantly zoom in and view a necessary part with a small screen.

As a means for achieving the above object, the configuration of the present invention comprises a frequency generating circuit for receiving a clock from an external oscillator, generating a first clock and a second clock;

A horizontal decoder and a counter which receives the video data and outputs horizontal valid video data in synchronization with the first clock of the frequency generating circuit;

A vertical decoder and counter for receiving the video data and the outputs of the horizontal decoder and the counter and outputting vertical valid video data in synchronization with a second clock of the frequency generating circuit;

A third clock and a second clock that receive the vertical and horizontal synchronization signals, the control data, the horizontal valid video data, the vertical valid video data, the first clock, and the second clock, thereby speeding up the first clock by a predetermined number of times; Select the clock or the fourth clock according to the control data to output the vertical and horizontal conversion signals, and in synchronization with the vertical and horizontal synchronous signals, the vertical start signal of the common driver which is the starting point of the horizontal and vertical valid video data. And a control circuit that outputs the horizontal start signal of the source driver.

Referring to the accompanying drawings, the most preferred embodiment which can easily implement this invention by the above structure is as follows.

4 is a block diagram of a liquid crystal controller capable of image magnification according to an embodiment of the present invention, and FIG. 5 is a diagram of generating a horizontal and vertical conversion clock signal by selecting from a normal clock and a clock twice as fast according to an embodiment of the present invention. 6 is a configuration diagram for generating a source driver start signal for a horizontal start signal according to an embodiment of the present invention, and FIG. 7 is a start diagram for a common driver for a vertical start signal according to an embodiment of the present invention. It is a block diagram which generates a signal.

As shown in FIG. 4, the configuration of the LCD controller for image magnification according to the embodiment of the present invention is configured to receive a clock from an external oscillator and to be perpendicular to the first clock X1 of the horizontal decoder and the counter. A frequency generator 11 for generating a second clock X2 of the decoder and the counter;

A horizontal decoder and counter 12 which receives the video data and outputs the horizontal valid video data X3 in synchronization with the first clock X1 of the frequency generating circuit 11;

A vertical decoder which receives the video data and the output of the horizontal decoder and the counter 12 and outputs the vertical valid video data X6 in synchronization with the second clock X2 of the frequency generating circuit 11. And counter 13;

A vertical and horizontal synchronization signal X5, control data X7, the horizontal valid video data X3, the vertical valid video data X6, the first clock, and the second clock; A third clock having a predetermined speed faster than the clock X1 and a fourth clock having a predetermined speed faster than the second clock X2 are generated, and the first clock X1 or the third clock, the second clock X2 or the first clock is generated. 4 clocks are selected according to the control data (X7) to output the vertical and horizontal conversion signals, and in synchronization with the vertical and horizontal synchronous signals, the common starting point of the horizontal and vertical effective video data (X3, X6). The control circuit 14 outputs a vertical start signal of the driver and a horizontal start signal of the source driver.

The operation of the liquid crystal controller capable of image magnification according to the embodiment of the present invention by the above configuration is as follows.

FIG. 1 is a horizontal video data corresponding to a single scan line, which shows the start signal of the source driver at the start of the effective video data and is sampled internally by the converted signal. FIG. 2 shows the National Television Systim Committee (NTSC). B) A scanning line according to a broadcasting standard such as a phase alteration by line (PAL), which shows that a vertical synchronization start signal and a conversion signal are generated at the start point of valid video data, and FIG. 3 shows an image according to a specific embodiment of the present invention. The position of the enlarged screen.

The liquid crystal control, according to the video data through the start signal (Shift), the start signal (Shift) of the source driver (SOURCE driver) for sampling the horizontal video data and the common driver (sample) for sampling the vertical video data By outputting, it refers to an integrated circuit having a function of displaying a screen sampled on the liquid crystal screen, and the present invention does not expand and display the video portion as in the conventional zoom function, and the screen is moved twice as fast as the sampling of the liquid crystal. ZOOM-UP), if you want to move the video to any location, the location should be promised and decoded in hardware. For example, referring to FIG. 3, if a circuit for moving a video by decoding only five commonly used screen sections is decoded in a predetermined position, the software is externally excluded except for five given screens. You can not set the position you want. In addition, the liquid crystal forms an aspect ratio screen of 320 × 240 or 640 × 480 depending on the number of times of the liquid crystal panel. Here, a general aspect ratio of 320 × 240 will be described. The frequency per single scan line in Fig. 2 is 15.75 Hz, and the period is 63.49 Hz, and the effective scanning line is about 50 Hz during this period. The frequency of sampling conversion of this in a 320 pixel horizontal source driver is about 3.15 MHz.

In the present invention, when the vertical synchronization start signal is the same but the conversion time is twice as fast, that is, when the sampling is further divided by twice, only half of the valid data is sampled. This feature applies the characteristic of latching and resampling data for outputting data when sampling and the next start signal occur. This is the same as in the case of a horizontal common driver even in the case of a vertical common driver. If the start signal point is the same but the sampling rate is twice as fast, referring to Fig. 3, only the screen indicated by No. 1 is twice as fast, and the first screen is displayed in full screen. Video data that should appear on the screens labeled 2, 3, 4, 5 can be displayed in full screen. That is, with a small screen, the user can enlarge the image to the full screen through sampling twice as fast and the horizontal and vertical start signals due to the user needs to enlarge the image.

5 is a configuration diagram in which a user inputs a selection signal to a selection means for receiving a normal clock and a clock twice as fast, and outputs horizontal and vertical conversion clock signals. FIG. 6 is a horizontal start point first point of FIG. A), receiving the signals decoded from the second point (B), the fourth point (D), the user inputs a horizontal selection signal to selectively output the start signal for the source driver for the horizontal start, FIG. 7 receives signals decoded from the first start point A, the third point C, and the fifth point E of the resin start point of FIG. 3, and the user inputs a vertical selection signal to common for the vertical start. This is a block diagram for selectively outputting a start signal for a driver.

The external clock is input from the oscillator, the frequency generator circuit 11 outputs the input pulses of the vertical decoder and the counter 13 to the second node X2, and the horizontal decoder and the counter 12 to the first node X1. Output pulse). Select the double sampling conversion clock and normal clock by the selection signal to generate the vertical and horizontal conversion clock signals.The control circuit controls the position of the start signal selected by the source driver and the common driver, respectively. Generates a start signal for the vertical common driver. Therefore, in order to enlarge the image of screen 1, the user doubles the conversion signal, respectively, the first point A which is the start of the vertical and horizontal components, and the second point B of the horizontal component which is 1/2 position of the entire screen. The decoder output to the second point (C) of the vertical component and the vertical component may be selected and output. In order to enlarge the image of the 2nd and 3rd screens, the converted signal is doubled and the start signal is the only horizontal component. The decoder output for generating to the second point B, which is the middle of the data, is selectively outputted, and in the case of the third screen, a decoder for generating the third starting point C at the vertical starting point in the middle of valid data is selected. In order to enlarge the image of the fifth screen, a decoded start signal may be generated to decode to start at the fourth point D and the fifth point E, which are 1/4 points of both vertical and horizontal. In other words, if the start position is the same, the sampling rate is doubled and output to the full screen to obtain the image enlargement function, and according to the position of the start signal of FIG. 3, 1/2, 3, 4, 5 of the full screen of the screen is obtained. Four-person video data can be displayed in full screen.

Therefore, the effect of the present invention, which operates as described above, enables to selectively select the sampling method of the liquid crystal controller to increase the variety of display functions by simply expanding the image by a certain number of times at a crosswise height, and to instantly make necessary parts with a small screen to the user. You can zoom in.

Claims (3)

A liquid crystal controller for liquid crystal television, comprising: a frequency generating circuit for receiving a clock from an external oscillator and generating a first clock and a second clock; Receive and decode and count video data, and synchronize horizontally with the first clock to output horizontal valid video data, the horizontal decoder and a counter; A vertical decoder and counter for receiving the video data to decode and count, receiving the output of the horizontal decoder and counter and synchronizing with the second clock to output vertical valid video data; A third clock and a second clock that receive the vertical and horizontal synchronization signals, the control data, the horizontal valid video data, the vertical valid video data, the first clock, and the second clock, thereby speeding up the first clock by a predetermined number of times; A fourth clock having a predetermined clock speed is generated, a first clock or a third clock, a second clock, or a fourth clock is selected according to the control data to output vertical and horizontal conversion signals, and the vertical and horizontal And a control circuit for outputting a vertical start signal of a common driver and a horizontal start signal of a source driver in synchronization with a synchronous signal. The liquid crystal controller of claim 1, wherein a user can designate a start position according to the control data of the horizontal start signal of the source driver. The liquid crystal controller of claim 1, wherein a user can designate a start position of the common driver based on the control data.