JPH08234698A - Liquid crystal display device and liquid crystal display method - Google Patents

Abstract

PURPOSE: To make the image data display on liquid crystal display panels having different aspect ratios as it is without performing signal processing for the image data if possible. CONSTITUTION: This liquid crystal display device displays even an image having the aspect ratio different from the liquid crystal display panel 11 on the liquid crystal display panel 11, and is provided with drain drivers 12b-12g driving signal electrodes in an area of displaying the image of the liquid crystal display panel 11 and the drain drivers 12a, 12h driving the signal electrodes in the area displaying no image of the liquid crystal display panel 11, and when the image having the aspect ratio equal to the liquid crystal display panel 11 is displayed, the sampling timings of the respective drain drivers 12b-12g and 12a, 12h are controlled altogether, and when the image having the aspect ratio different from the liquid crystal display panel 11 is displayed, the sampling timing of the respective drain drivers 12b-12g and the drain drivers 12a, 12h is individually controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device and a liquid crystal display method for displaying an image having an aspect ratio of 4: 3 on a liquid crystal display panel having an aspect ratio of 16: 9.

[0002]

2. Description of the Related Art Recently, a horizontally elongated display image of a MUSE system called a so-called high-definition signal or a second generation ED
Television receivers for displaying a horizontally long display image of the TV system have become widespread. However, when it is desired to directly display a horizontally long display image having an aspect ratio of 16: 9 of this kind on a liquid crystal television receiver, it goes without saying. As described above, it is necessary to configure the liquid crystal display panel of the display unit to have an aspect ratio of 16: 9 and drive the display.

When displaying an image of the current aspect ratio of 4: 3 on the horizontally long liquid crystal display panel having the aspect ratio of 16: 9, for example, as shown in FIG. Some blanking display (black display) is required.

[0004]

However, in the case of actually performing the display as shown in FIG. 5, even if the aspect ratio is adjusted by changing the frequency of the sampling clock of the original image data, the screen In the left and right blanking display areas, a residual image outside the image range of the aspect ratio of 4: 3, which is not normally used for display, noise due to the horizontal synchronizing pulse, and the like are displayed.

Therefore, in order to reliably perform the display shown in FIG. 5, not only the frequency of the sampling clock of the original image data is changed, but also the pseudo image data of the blanking display portions on the left and right sides of the screen are changed to the original image. There is a problem in that the circuit configuration becomes complicated because it is necessary to perform signal processing such as synthesizing with data and performing display driving again with this synthesized data.

The present invention has been made in view of the above situation, and an object thereof is to carry out image processing of the original image data with respect to the image data without performing signal processing on the original image data as much as possible. Another object of the present invention is to provide a liquid crystal display device and a liquid crystal display method capable of displaying as they are on different liquid crystal display panels.

[0007]

That is, the present invention is a liquid crystal display device which displays an image having an aspect ratio different from that of the liquid crystal display panel on the liquid crystal display panel, and displays the image on the liquid crystal display panel. A first electrode drive circuit that drives the electrodes of the area, a second electrode drive circuit that drives the electrodes of the area of the liquid crystal display panel that does not display the image, and an image with the same aspect ratio as the liquid crystal display panel. In this case, the timings of the first electrode driving circuit and the second electrode driving circuit are collectively controlled. When displaying an image having an aspect ratio different from that of the liquid crystal display panel, the first electrode driving circuit and the second electrode driving circuit are controlled. The switching control means for individually controlling the timing of the second electrode drive circuit is provided.

[0008]

With the above-described structure, the signal processing is not performed on the target image data,
This image data can be easily displayed on the liquid crystal display panel having an aspect ratio different from that of the image data.

[0009]

The present invention will be described below with reference to a TFT (Thin Film).
An embodiment in the case of being applied to an active matrix type liquid crystal display panel driving device using a Transistor (thin film transistor) will be described with reference to the drawings.

FIG. 1 shows the configuration around the liquid crystal display panel. 11 is a liquid crystal display panel having an aspect ratio of 16: 9, and 12a to 12h are divided drain electrodes which are signal electrodes of the liquid crystal display panel 11, respectively. Drain driver to drive (indicated as "D1" to "D8" in the figure), 1
Reference numerals 3a and 13b are gate drivers (indicated as "G1" and "G2" in the figure) for separately driving the gate electrodes which are the scanning electrodes of the liquid crystal display panel 11.

The drain drivers 12a to 12h are
Each of the drain drivers 12a and 12a is formed of a one-chip IC and is located at both ends thereof as shown in the drawing.
The RGB signal input (1) which is an image signal for image display is input to the drain drivers 12b to 12g except h, and the RGB signal input (2) is input to the drain drivers 12a and 12h located at both ends.

Here, for example, the liquid crystal display panel 11 has 9
60 (320 x 3 (RGB)) drain electrodes and 24
Drain driver 12a to
It is assumed that 12h individually drives 120 drain electrodes, with three drain electrodes as one pixel.

Further, the gate drivers 13a and 13b are also each configured by a one-chip IC, and the liquid crystal display panel 11 is divided into upper and lower parts to drive 120 gate electrodes respectively. In this case, the gate driver 1
As for 3a and 13b, the apparent number of pixels may be set to 480 by carrying out double-speed sequential or interlaced scanning drive if necessary.

Further, as shown in FIG. 2, the RGB drivers (1),
In addition to (2), the sampling clock CLK, sampling start signals SRT (1) to (3) and other various control signals are input.

That is, the sampling clock CLK and various control signals are commonly input to the drain drivers 12a to 12h, but as the sampling start signal, the SRT (1) is located at the left end of the drain driver 1.
2a and SRT (3) are input to the drain driver 12h located at the right end, and SRT (2) is input to the other drain drivers 12b to 12g.

The drain drivers 12b to 12g are configured to output a clock for starting the sampling of the driver of the next stage when the sampling of one driver is completed.
(2) and the start control signal are cascade-connected as shown in the figure.

In the above-mentioned structure, when a horizontally long image having an aspect ratio of 16: 9 is displayed by using the entire screen of the liquid crystal display panel 11, the RGB signal input (1) which is the image data is input. , (2), continuous signals forming one image are input.

At this time, the sampling clock C
LK is set to a frequency such that one horizontal effective display portion is displayed during the time when all 960 drain electrodes driven by the drain drivers 12a to 12h are driven.

As for the sampling start signal, the SRTs (1) to (3) are timing-controlled so as to be successively continuous corresponding to the image data as shown in FIGS. 3 (1) to (4).

Next, when a normal image having an aspect ratio of 4: 3 is displayed using the center of the screen of the liquid crystal display panel 11, one image is obtained by only inputting the RGB signal (1) as the image data. The constituent signals are input, and a rectangular wave signal for blanking display is input as the RGB signal input (1).

This rectangular wave signal is a signal having the same center voltage and the same center voltage as the RGB polarity inversion signal and having an amplitude such that black display is performed, and this signal and the RGB signal for displaying the horizontally long image are , And is input to the drain drivers 12a and 12h by switching with an analog switch or the like.

At this time, the sampling clock C
LK is driven by the drain drivers 12b to 12g 7
The frequency is set such that one horizontal effective display portion is displayed in the time for driving the 20 drain electrodes.

Regarding the sampling start signal, as shown in FIGS. 3 (5) and 3 (6), S
Timing control of RT (2) and this SRT
Simultaneously with (2), SRTs (1) and (3) are given together.

The switching of each control signal between the case of displaying the horizontally long image and the case of displaying the normal image is all performed by a control circuit (not shown) provided for the liquid crystal display device.

In the above embodiment, the drain driver 1
2a to 12h have been described as having the same number of outputs, but for example, when displaying a normal image with an aspect ratio of 4: 3, a drain driver at both left and right sides for performing blanking display and a drain driver for performing image display are used. Even if the number of outputs is different, the same effect can be obtained if the control has the same configuration as that described above.

In the above embodiment, only the case of displaying an image having an aspect ratio of 4: 3 on a horizontally long liquid crystal display panel having an aspect ratio of 16: 9 is illustrated, but the present invention is not limited to this. On the contrary, when displaying a horizontally long image having an aspect ratio of 16: 9 on a liquid crystal display panel having an aspect ratio of 4: 3, the gate drivers 13a 'and 13b' are corresponded to the area as shown in FIG. It can be divided and driven similarly.

Furthermore, the aspect ratio of the image has been explained only in two ways, "4: 3" and "16: 9", but the invention is not limited to these and various other aspects are possible depending on the difference in the television system. Of course, it is possible to assume that the aspect ratio is.

[0028]

As described above, according to the present invention, this image data can be easily applied to a liquid crystal display panel having an aspect ratio different from that of the image data without subjecting the image data to be processed. It is possible to provide a liquid crystal display device and a liquid crystal display method capable of displaying on the screen.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a liquid crystal display panel and a drive circuit thereof according to an embodiment of the present invention.

FIG. 2 is a diagram showing an input system of control signals to the drain driver of FIG.

FIG. 3 is a diagram for explaining the operation according to the embodiment.

FIG. 4 is a diagram showing another configuration of the liquid crystal display panel and the drive circuit thereof according to the embodiment.

FIG. 5 is a diagram illustrating a case where image data is displayed on a screen having an aspect ratio different from that of the image data.

[Explanation of symbols]

 11 ... Liquid crystal display panel 12a-12h ... Drain driver (D1-D8) 13a, 13b ... Gate driver (G1, G2)

Claims (2)

[Claims] 1. A liquid crystal display device for displaying an image having an aspect ratio different from that of the liquid crystal display panel on the liquid crystal display panel, the first liquid crystal display panel driving an electrode in an area for displaying the image. An electrode drive circuit, a second electrode drive circuit for driving the electrodes of the liquid crystal display panel in a region where the image is not displayed, and a first electrode for displaying an image having an aspect ratio equal to that of the liquid crystal display panel. When the timings of the drive circuit and the second electrode drive circuit are collectively controlled and the image having an aspect ratio different from that of the liquid crystal display panel is displayed, the timings of the first electrode drive circuit and the second electrode drive circuit are individually controlled. A liquid crystal display device comprising a switching control means for controlling. 2. A liquid crystal display method for displaying an image having an aspect ratio different from that of the liquid crystal display panel on the liquid crystal display panel, the first liquid crystal display panel driving an electrode in an area for displaying the image. In the case of displaying an image having the same aspect ratio as that of the liquid crystal display panel, the electrode drive circuits and the second electrode drive circuit for driving the electrodes in the area where the image is not displayed are collectively controlled in timing. ,
A liquid crystal display method, wherein when displaying an image having an aspect ratio different from that of the liquid crystal display panel, timings of these electrode drive circuits are individually controlled.