JPH07129123A - Lcd multi-think monitor - Google Patents

Abstract

PURPOSE:To display a multi-signal different in a clock frequency and a synchronizing frequency by finding ratios of picture elements of an input signal and an LCD panel, and writing them simultaneously in vertical and horizontal drivers according to these ratios. CONSTITUTION:An input signal process circuit 9 performes signal processing to project an image clearly on an LCD panel 12 by a signal from an input signal switching circuit 13. Here, an input signal discriminating circuit 7 discriminates a classification (for example, an NTSC TV signal, a personal computer signal or the like) of an input signal, and a timing controller 8 calculates ratios (m and n) of the vertical and horizontal picture element number of the input signal and the vertical and horizontal picture element number of the LCD panel 12, and sends out signals by (m) pieces to a vertical driver 10 to be written simultaneously by (n) pieces in a horizontal driver 11. Thereby, since a multi-signal different in a clock frequency and a synchronizing frequency can be displayed by a single LCD monitor, a multi-think monitor making the most of characteristics such as a thin type or low voltage can be realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is an LC capable of displaying character / image signals having different clock frequencies / synchronous frequencies on a single liquid crystal display (LCD) monitor.
D multi-sync monitor

[0002]

2. Description of the Related Art At present, the world is in the information age, and even if the surroundings are easily looked at, the characters of many signal systems such as NTSCTV signals, personal computer signals, VGA personal computer signals, engineering workstation (EWS) signals, etc. Uses images. At this time, it is extremely wasteful to install an image-receiving monitor for each of them in terms of effective use of space space. Therefore, a multi-sync image receiving monitor becomes necessary.

In recent years, LCD monitors have been put to practical use as color televisions, personal computers, word processors, etc., by taking advantage of their features such as thinness, low voltage, and low power consumption as an alternative to CRT display monitors. However, as a conventional analog input multi-sync compatible display monitor, a multi-sync compatible display device using a CRT display monitor is predominant.

[0004]

A conventional multi-sync display using a CRT scans a beam from the upper left to the lower right on the screen according to the basic principle of CRT scanning, and keeps the scanning frequency as an input signal. , The horizontal and vertical scanning amplitudes are controlled by the magnitude of the current value flowing in the deflection yoke. The screen position is determined by the voltage sensor value of the deflection waveform according to the basic principle of CRT scanning. As described above, since the multi-sync display using the CRT uses the basic principle of continuous scanning of the CRT scan, multi-sync display is relatively easy.

By the way, since the pixels of the LCD have a digital structure, the writing point of the signal is written in the pixel in the order of the signal to be sent. The conventional method is to use the line sequential fixed method.・ Displaying images It was difficult to use multi-sync.

An object of the present invention is to provide a new type LCD multi-sync monitor which solves the conventional problems.

[0007]

An LCD multi-sync monitor according to the present invention has an LCD panel, vertical and horizontal drivers for driving the panel, a circuit for switching an input signal, and a signal from the switching circuit on the LCD panel. An input signal processing circuit that performs signal processing to clearly display an image on the screen, a circuit that determines the type of the input signal, and the number of vertical and horizontal pixels of the input signal and the vertical and horizontal pixels of the LCD panel based on the signal from the determination circuit. And a timing controller for calculating the ratio m, n of the numbers and sending m write signals to the vertical driver and n write signals to the horizontal driver at the same time.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of an LCD multi-sync monitor according to an embodiment of the present invention. Are reference examples of input signals, are NTSCTV signals, are personal computer signals, are VGA personal computer signals, are XGA personal computer signals, are E
WS workstation signal, vertical number of pixels is 204
8 is a signal of horizontal 2560. When these input signals are input to the input signal switching circuit 13, the switching circuit 13
Which input signal came in, for example NTSCTV
The input signal processing circuit 9 is notified that a signal has come in. The input signal processing circuit 9 is an LCD panel 12
The signal processing is performed to display the image clearly, and a signal is output to the LCD horizontal driver 11.

On the other hand, to the circuit 7 for discriminating the type of the input signal, the synchronizing signals from the input signal to are inputted. The discrimination circuit 7 determines which signal the input signal is, for example, NTSCTV
It is determined that a signal has been input, and a signal to that effect is sent to the LCD timing controller 8. The LCD timing controller 8 stores the number of pixels in the vertical and horizontal directions of the LCD panel 12, calculates the ratio with the number of pixels in the vertical and horizontal directions of the input signal, and determines the number of pixels of the input signal in the LCD panel. When the number is smaller than the number, the signal is sent to the vertical driver 10 and the horizontal driver 11 so as to be expanded to an integral multiple, and when the number is larger, the writing is performed with a reduction. Each driver operates according to this, LCD
The screen of the panel 12 can be effectively used regardless of the number of pixels of the input signal.

The multi-sync support will be described by further showing concrete numerical values. For example, LCD panel 12 used
The number of pixels of is 1024 vertically and 1280 horizontally. This number of pixels is stored in the timing controller 8. Now, NTSC TV signal (pixel number vertical 240 × 2,
(640 horizontal), if the multi support is not available, the LCD panel 12 will have 240 vertical and 64 horizontal.
Character / image information is written only to 0 pixels, resulting in a small screen and 1024 pixels or 1280 pixels not being effectively used. In this embodiment, the timing controller 8
In the vertical direction, m = 1024 / 240≈4, in the horizontal direction, n = 1280/640 = 2, that is, in the vertical direction, m signals for each horizontal direction are sent to the vertical driver 10 and the horizontal driver 11. , Write images in 960 vertical and 1280 horizontal areas of the LCD panel 12. As a result, 1024 and 1280 pixels of the LCD panel 12 can be effectively utilized.

Besides, for example, XGA (Extended)
In the case of a d Graphics Array) signal (the number of pixels is vertical 768, horizontal 1152), and the EWS signal (the number of pixels is vertical 1024, horizontal 1280), m = 1, n
It is used as = 1.

Simultaneous writing of m units in the vertical direction is performed by sequential pulses for operating the vertical drive driver 10 in groups of m units. Simultaneous writing of n in the horizontal direction is to simultaneously transmit the frequency of the horizontal driver 11 to the upper and lower two horizontal drivers 11 that drive the luminance and color signals of the LCD panel 12 without increasing the frequency of the horizontal driver 11 by n times. It becomes possible with.

FIG. 2 shows an embodiment when n = 2 in the horizontal direction. Input signal processing circuit 9, horizontal driver 11,
The LCD panel 12 has the same function as that shown in FIG. 1, and the LCD panel 12 is shown with only one line in the horizontal direction. Here, in the liquid crystal pixel, R ₁ = R ₂ , G ₁ = G ₂ , B ₁ = B ₂
By writing the same signal to the two liquid crystal pixels, _n = R _{n + 1} , G _n = G _{n + 1} , and B _n = B _{n + 1} , the horizontal direction 1280
A VGA of a 640 pixel signal in the horizontal direction or a personal computer signal can be enlarged in the horizontal direction and projected on the liquid crystal of the pixel.

As an example of the method of writing the simultaneous signals to n and n + 1, there is a method of sampling one pixel signal at a frequency of 1/2 of the pixel. LCD for vertical 2 pixel enlargement
This is possible by writing the n and n + 1 lines of the vertical driver at the same timing.

[0015]

As described above, according to the present invention, a multi-sync capable of displaying multi-signals having different clock frequencies and synchronization frequencies on one LCD monitor and effectively utilizing the characteristics of the LCD described above. Can be monitored.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a diagram for explaining a case of n = 2 according to an embodiment of the present invention.

[Explanation of symbols]

 7 Input Signal Discrimination Circuit 8 Timing Controller 9 Input Signal Process Circuit 10 Vertical Driver 11 Horizontal Driver 12 LCD Panel 13 Input Signal Switching Circuit

Claims (1)

[Claims] 1. An LCD panel, vertical and horizontal drivers for driving the panel, a circuit for switching an input signal, and a signal from the switching circuit for performing signal processing for displaying an image clearly on the LCD panel. An input signal processing circuit, a circuit for discriminating the kind of the input signal, and a ratio m, n between the number of vertical and horizontal pixels of the input signal and the number of vertical and horizontal pixels of the LCD panel is calculated by the signal from the discriminating circuit, and the vertical driver is supplied to the vertical driver. An LCD multi-sync monitor having m timings and a timing controller for transmitting n signals simultaneously written to a horizontal driver.