JPH08314408A - Picture output device for liquid crystal display device and liquid crystal display device - Google Patents

Abstract

PURPOSE: To provide a liquid crystal display device which can perform clean display having no flicker and blur and cope with variation of a display mode such as variation of resolution for a drawing and the like. CONSTITUTION: This device is constituted of a liquid crystal display device 201 which has a picture output device 102 including a dot clock signal output terminal 107 and a dot clock signal input terminal 212, and distributes picture signals to each pixel of a liquid crystal display section 211 by using an inputted dot clock signal. Also, the liquid crystal display device 201 is provided with a CPU 204 discriminating a display mode from a dot clock signal, a horizontal and a vertical synchronizing signals, a horizontal dot numbers counter 202 counting the number of horizontal dots from a dot clock signal and a horizontal synchronizing signal, a vertical dot numbers counter 203 counting the number of vertical dots from a horizontal synchronizing signal and vertical synchronizing signal, a RAM 205 can preserve a display mode and a picture setting value corresponding to its display mode, and a picture processing chip 208 performing picture conversion based on the setting value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image output device for a liquid crystal display device and a liquid crystal display device.

[0002]

2. Description of the Related Art At present, a liquid crystal display is used as a display device replacing a CRT, as a display device for a computer terminal, a television, etc., especially for a notebook personal computer.
In the near future, a large-area and space-saving liquid crystal display will be used as a display device of a desktop personal computer, and a liquid crystal projector type display device will be used as a larger display device. In this way, liquid crystal display devices are expected to spread as alternatives to CRTs, whereas liquid crystal display devices used in current notebook computers input digital signals as image signals. Since an analog signal is input as an image signal in the CRT, the current digital signal type liquid crystal display device cannot be used as it is as a CRT substitute.

Here, the digital signal system and the analog signal system of the image signal will be described. The digital signal method is a method of digitally expressing the gradation of each RGB image signal, and requires 2 × the number of electric wires. For example, R of RGB
When trying to display 64 gradations in (red), 2 to the 6th power →
Six signal lines are required. If all 6 wires are 0,
It is expressed as 000000, which means 0/64 gradation. 0110
If it is 11, there are 27/64 gradations. In this case, RG
B For each of the 64 gradations, 18 electric wires are required. Further, normally, two signals, that is, a horizontal synchronizing signal and a vertical synchronizing signal are required, so that a total of 20 wires are required. The horizontal sync signal and the vertical sync signal will be described later. On the contrary,
The analog signal system expresses gradation by voltage. Also 64
To express the gradation, if the voltage to be transmitted is 1 Vpp, one gradation is expressed by 1 / 64V. In this case, no matter what the gradation is, only a total of five electric wires are required, one for each RGB and the horizontal and vertical synchronizing signals. On the other hand, in the digital method, the number increases as the gradation increases. Considering the S / N ratio, there are some digital methods, but
Due to the large number of electric wires that must be connected, the current analog output method is the mainstream for CRTs.

In either method, the image signal that can be transmitted at one time is data for one pixel, so in order to form a two-dimensional screen, dots (1 pixel) are arranged in a line (1 horizontal line). Then, the lines must be lined up on the surface (screen). The division (line feed) of the horizontal 1 line at this time is called horizontal synchronization, and a horizontal synchronization signal is sent when drawing of the horizontal 1 line is completed. Similarly, the division of one screen is called vertical synchronization, and a vertical synchronization signal is sent when one screen has been written.
These two sync signals are the signals needed to shape the screen. In addition to this, there is a dot clock signal as a division of one pixel (time to write data). The image output unit in the personal computer sends the image data based on this signal, but it is not output to the normal CRT. This dot clock is unnecessary for the CRT, but is necessary for the liquid crystal display device.

Currently, notebook-type personal computers are the mainstream of products using liquid crystal display devices. Since the image signal output section (personal computer main body) and the image display section (liquid crystal) are integrated in the notebook type personal computer, they are connected by a digital output dedicated to the liquid crystal display device instead of the usual CRT output. Therefore, the dot clock signal is also connected, and the start signal, which is another signal necessary for the liquid crystal display device, is also connected. This start signal is a signal for adjusting the image position on the screen. By this adjustment signal, the pixel data on the upper left of the screen is displayed on the upper left of the screen. If this signal goes wrong, for example, the screen will shift to the lower right and stick out. Further, the dot clock signal is also a signal for distributing the image data to one pixel of the liquid crystal display device, and is therefore indispensable for the liquid crystal display device. Since the laptop computer has an integrated image output unit and display unit, these signals can be connected by a dedicated line.

On the other hand, in a liquid crystal display device connected to an ordinary CRT output, for example, a liquid crystal projector, the dot clock signal and the start signal, which are necessary signals for the liquid crystal display device, are not transmitted, so that the liquid crystal drive system is somewhat different. I have to change. First, since the image signal is continuously sent for one horizontal line, it is necessary to allocate this signal to each pixel of the liquid crystal panel. Originally, the dot clock signal should be allocated, but since the dot clock signal is not sent, the liquid crystal display device side stores the number of pixels in the horizontal direction of the liquid crystal panel (stored in the ROM. ) The period of the dot clock is reproduced by dividing the image signal of one line by the number. (For example, if the number of horizontal pixels is 640, the time obtained by dividing the signal on one line by 640 is the dot clock.) The video signal is allocated to each pixel at the timing of this dot clock. Next is the start signal, but this is not something that can be reproduced like the dot clock signal, so it is necessary to save the setting of the image position in ROM in advance. As described above, the liquid crystal display device currently used by being connected to the CRT image output terminal of the personal computer is used by changing the driving method.

A projector-type liquid crystal display device is one of the liquid crystal display devices actually used by being connected to a CRT image output terminal of a personal computer. This uses a liquid crystal as a light valve for large-screen projection, and is used for presentations and education. 2. Description of the Related Art In recent years, with the increase in screen size of image output devices, a projector-type image device capable of displaying on a larger screen than an ordinary CRT system has been receiving attention.
This projector type image device is classified into two types depending on its projection form and is called a front projection type and a rear projection type, respectively. The front projection type has an independent projection unit and screen,
Project an image through a magnifying lens on the front screen and see the reflected light. On the other hand, the rear projection type often has a projection unit and a screen integrated, and the transmitted light projected from the back of the screen is seen from the front. The front projection type is difficult to see in a bright place because of the contrast, but it is easy to realize a large screen size, and the rear projection type is easy to see in a bright place, but the screen size is fixed and cannot be made too large. Thus, each method has advantages and disadvantages.
For this reason, there is a device that supplements the above-mentioned disadvantages to some extent by attaching a small rear screen to the front projection type device or by allowing the rear projection type device to project onto the front screen. These devices perform switching by inserting one or two mirrors when switching the projection method. This is because the left and right sides of the image are reversed due to the difference between the front projection method and the rear projection method. Further, depending on the projection optical system, it may be turned upside down.
These inversions are optically corrected by using a mirror. Further, there is also one in which the image is inverted by changing the scanning direction of the image signal. A mechanism for changing the scanning direction of the image signal is also installed in the front projection type image output device which can be installed on the ceiling. This is to prevent the image from being turned upside down when it is installed on the ceiling.

[0008]

CRT according to the prior art
In the output connection type liquid crystal display device, the dot clock signal originally used when synthesizing images on the personal computer side is not used as it is, but the dot clock signal reproduced on the liquid crystal display side is used. There were times when the phase was out of phase and the period was different. The deviation of the dot clock signal causes flicker or bleeding when an image is displayed, resulting in deterioration of image quality.

On the contrary, the fact that the information for reproducing the dot clock signal and the information such as the start signal (setting of the position of the image) are recorded in the ROM means that RO
Only the image settings recorded in M can be displayed. At present, personal computers are often used to display by changing the screen resolution. This is due to the limitation of the screen resolution and the number of colors that can be simultaneously developed,
(For example, 640 x 480 can produce 16 million colors simultaneously, but 1024 x 768 produces 64 thousand colors and 128
With 0x1024, only 256 colors can be displayed. ) The user will use the screen resolution and the number of colors as necessary. This means that there are many display modes with different screen resolutions and dot clocks, and various image settings are required for each mode. In CRT type displays, there are many products that respond to changes in screen resolution. On the other hand, in the case of current liquid crystal display devices, RO
Since only the display modes stored in M can be supported, the display modes that can be supported are limited. Currently, the display modes output from personal computers vary depending on the manufacturer of the image output board, and even with the same resolution,
Different manufacturers have different display modes. When a current liquid crystal display device is used as a display device for a personal computer in such a situation, it can support only a limited display mode and is low in versatility. Further, there is a liquid crystal projector as an example of using such a CRT output connection type liquid crystal display device, and this liquid crystal projector also has adjustment items such as brightness, contrast and color tone as in a normal CRT display. In addition, since it is a projector type, it is necessary to make adjustments such as focusing, a zoom mechanism, and reversing the image scanning direction (switching between front projection and rear projection), which are not found in ordinary displays. Normally, these adjustments are structured to be performed manually or by a control device attached to the image output device itself. For this reason, it is difficult to see and adjust with a projector-type image output device that is often operated in a dark room. In addition, when a computer is connected to these image output devices and used for a presentation, these adjustments are very inconvenient especially when the image output device and the computer are separated or in another room. In addition, when the projector lamp is automatically turned off to reduce power consumption during holidays, or when it is turned on and off for a certain period of time to be used for some kind of advertising display, the projector lamp should be turned off. It is necessary to directly adjust the light intensity of.

It is an object of the present invention to provide a liquid crystal display device having higher image quality and higher performance than conventional ones, and an image output device for a liquid crystal display device used as a pair with the liquid crystal display device.

[0011]

Means for realizing an image output device for a liquid crystal display device of the present invention is configured so that a terminal for outputting a dot clock signal is included in an image signal output terminal group.

Further, the liquid crystal display device of the present invention includes a terminal for inputting a dot clock signal in the image signal input terminal group, and the number of horizontal dots for counting the number of horizontal dots of an image to be displayed inside the main body. A counter device, a vertical dot number counter device that also counts the number of vertical dots, a CPU that determines the screen resolution based on the numbers of horizontal and vertical dots, and a screen configuration, and an image processing chip that converts an image according to this screen configuration. And a key input device for inputting the adjustment of the screen configuration, and a RAM for storing the adjusted setting of the screen configuration.

The means for realizing the image output device for the liquid crystal projector type display device of the present invention includes a terminal for outputting a dot clock signal in the image signal output terminal group and various command signals for the liquid crystal projector device. Is configured to include a terminal for outputting.

In the liquid crystal projector type display device of the present invention, the image signal input terminal group includes a terminal for inputting a dot clock signal and a terminal for inputting various command signals for the liquid crystal projector device. A horizontal dot number counter device that counts the number of horizontal dots of the image to be displayed inside the main body, a vertical dot number counter device that also counts the number of vertical dots, and the screen resolution is determined from these horizontal and vertical dot numbers. CPU that determines the configuration
And an image processing chip for converting an image according to this screen configuration, a key input device for inputting adjustment of this screen configuration, and an RA for storing the adjusted screen configuration settings.
M, and a CPU for discriminating various command signals for the liquid crystal projector device and adjusting a focus mechanism, a zoom mechanism, brightness and the like.

[0015]

According to the configuration of the image signal output device for a liquid crystal display device and the liquid crystal display device according to the present invention, the dot clock signal used in the image output combining section of a personal computer or the like is directly sent to the liquid crystal display device. It is not necessary to reproduce the dot clock signal on the liquid crystal display device side, and it is possible to reduce image shift and distortion. Also, since it can support any display mode, it can be connected to many PCs and workstations.

Further, according to the image signal output device for a liquid crystal projector type display device and the liquid crystal type projector type display device according to the present invention, the dot clock signal used in the image output synthesizing section of a personal computer or the like is directly supplied to the liquid crystal display device. The dot clock signal does not have to be reproduced on the liquid crystal display device side because it is sent to the device, and image shift and distortion can be reduced. Also, since it can support any display mode, it can be connected to many PCs and workstations. Further, from a computer, a zoom mechanism adjustment signal, a focus adjustment signal, a brightness adjustment signal, a contrast adjustment signal, a color density adjustment signal, a hue adjustment signal, an image quality (sharpness) adjustment signal, a color balance adjustment signal, a gamma value adjustment signal, a projector Since various command signals to the liquid crystal projector type display device, such as a signal for adjusting the image scanning direction of the image display device and a signal for adjusting the light amount of the lamp of the projector type image display device, can be sent from the computer side. It is possible to do.

[0017]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an image output device for a liquid crystal display device and a liquid crystal display device according to an embodiment of the present invention.

A liquid crystal display image output device 102 in the personal computer 101 is provided with a dot clock signal output terminal 106, and each of the RGB image signal lines 304 and horizontal synchronization signal lines which are normal CRT outputs. Three
02, the vertical synchronizing signal line 303, and the dot clock signal line 301 are connected to the liquid crystal display device 201.
The dot clock signal is the image output device 10 for the liquid crystal display device.
It is taken out directly from the graphic controller 104 in the No. 2. The graphic controller 104 sets the display mode of the image to be output, and sends the image data stored in the frame memory 105 through the D / A converter 106 based on the dot clock signal at that time.

On the other hand, the liquid crystal display device 201 is also provided with a dot clock signal input terminal 212 so that the dot clock signal from the graphic controller 104 can be directly received. The dot clock signal received by the liquid crystal display device is input to the CPU 204, and the CPU 204 drives the horizontal scanning circuit 209 and the vertical scanning circuit 210 based on this signal to accurately decompose the image signal for each pixel, Input to the liquid crystal display unit 211. This enables a clear display with less color shift and bleeding.
Further, the CPU 204 responds to the change of the display mode by using the dot clock signal, the horizontal synchronizing signal, and the vertical synchronizing signal. FIG. 2 shows the image setting when the display mode is changed.
A flowchart of image setting performed on the liquid crystal display device 201 side is shown in FIG. Hereinafter, a specific description will be given with reference to this figure. CPU 204 to which the dot clock signal input from the dot clock input terminal 212, the horizontal synchronizing signal, and the vertical synchronizing signal are input
The image settings corresponding to these combinations are in RAM205 or
Judge whether it is stored in ROM206. here,
RAM205 or ROM2 when the corresponding setting value is saved
The value is read from 06 and displayed according to the set value. Since each of these frequencies and the corresponding set values can be stored in the RAM 205, the display mode that has been set once can be automatically displayed with the optimum setting when the next display is performed. In addition, the display mode, which is defined as a standard such as VGA, is written in the ROM 206 in advance. On the other hand, when the corresponding set value is not stored, the CPU 204 next obtains the number of horizontal dots from the dot clock signal and the horizontal synchronizing signal, and also obtains the number of vertical dots from the horizontal synchronizing frequency and the vertical synchronizing frequency. Then, the image is provisionally displayed so that the intermediate value of the number of horizontal dots and the number of vertical dots comes to the center of the liquid crystal display device. The image displayed in this way often has no display range between the image and the liquid crystal, and is displaced vertically and horizontally. Therefore, the shift is adjusted by the manual input device so that the image is correctly within the display range of the liquid crystal display device. At that time, the screen setting is saved, and when the signal of the same frequency is input next to each synchronizing signal, the setting value is read from the RAM as described above and the display is performed at the correct position.

In the conventional liquid crystal display device which does not input the dot clock signal, the number of horizontal dots cannot be counted in the above process, and the number of horizontal dots of the input image signal cannot be discriminated. Pixels are not allocated and display cannot be performed.

As described above, this liquid crystal display device can display in several display modes of different resolutions. However, if the image signal is output as it is to the liquid crystal display section, for example, a liquid crystal display device has 128 pixels
If a 640.times.480 image signal is input at 0.times.1024, it is only displayed at the left corner, about 1/4 area. In such a case, for example, 640 × 4
The image signal of 80 is doubled vertically and horizontally, and 1280 x 96
A signal of 0 is used for display, and the remaining 64 upper and lower lines display black. This processing is performed by the image processing chip 20.
8 do. The image processing chip 208 receives the data of the number of pixels of the liquid crystal display device and the number of pixels of the input image signal from the CPU 204, and optimizes the image signal data to match the number of pixels of the liquid crystal display device. . For example, 10
640 × 48 for liquid crystal display device with 24 × 768 pixels
When an image signal of 0 is input, the vertical and horizontal directions are simply 1.
If you multiply it by 6 times, the characters will look awkward and pictures and lines will not be clearly visible. Interpolate what is necessary about this, and cut off where it seems unnecessary.
Optimize. This optimization is not only for expanding the screen,
It is possible at the time of reduction. This optimization can also be overridden by a manual input device.

It is very useful to include the dot clock signal output terminal on the image output device side as described above, not separately from the normal CRT image signal output terminal group.
Since the dot clock signal is used in the image output device, it is not located apart from the CRT image signal output terminal group, and it is not necessary to purposely prepare another terminal. In addition, at the present time, an IBM / AT compatible personal computer has a D-SUB1 as an image signal output terminal group for CRT.
Since 5 pins are used, not all terminals are used and there is a space. This means that the dot clock signal inside the image output device is connected to an empty terminal of the output terminal group.
With a very simple modification, the existing CRT image output device can be replaced with the liquid crystal display image output device of the present invention. Since the display on the CRT can be performed after this modification as in the conventional case, the image output device for liquid crystal display device of the present invention by such modification is upward compatible with the current image output device for CRT.

Also, since it is not necessary to purposely make a terminal for the dot clock signal even on the liquid crystal display device side of the present invention, it is useful to include the terminal for the dot clock signal in the current CRT image signal input terminal group. Is. According to this, since no special cable is required, a normal CRT image output device can be connected to the liquid crystal display device of the present invention. In this case, since the dot clock signal is not sent, it is not possible to deal with the case where the image signal is sent in the unsaved display mode, but as a standard such as the display mode saved in the RAM or the VGA standard. When the display mode is set and stored in the ROM 206, normal image output is possible. From this, it is understood that the liquid crystal display device of the present invention is also upwardly compatible with the existing CRT image output terminal connection type liquid crystal display device.

FIG. 3 shows an embodiment in which a personal computer having an image output device for a liquid crystal projector type display device of the present invention and a liquid crystal projector type image output device are used.

An image output device 150 for a liquid crystal projector type display device in the personal computer 101 is provided with a terminal 106 for outputting a dot clock signal and a terminal 109 for outputting various command signals for the liquid crystal projector device. . The image output device 150 for a liquid crystal projector type display device includes therein a projector adjustment signal generator 108 that receives a signal from the CPU 103 and generates various adjustment signals for the projector, and is generated from this. Terminal 10 for outputting various adjustment signals for the projector
9 is the same as the image output device for liquid crystal display device 102 of the present invention described in FIG.

Not only the liquid crystal projector type display device, but also the projector device requires various projector-specific adjustments such as focus adjustment and zoom mechanism adjustment in addition to various image quality adjustments in a normal CRT. In order to perform these adjustments from the personal computer side, a projector adjustment signal generator 108 for converting various adjustment commands from the CPU 103 into signals for the liquid crystal projector device 250 and transmitting the signals is provided. Liquid crystal projector type display device 2 sent from the generator 108
The following are examples of adjustment signals for 50. Zoom mechanism adjustment signal, focus adjustment signal, brightness adjustment signal, contrast adjustment signal, color density adjustment signal, hue adjustment signal, image quality (sharpness) adjustment signal,
The color balance adjustment signal, the gamma value adjustment signal, the image scanning direction switching signal, the lamp light amount adjustment signal, and the above signals are sent from the projector adjustment signal output terminal 109.

Liquid crystal projector type display device 2 of the present invention
50 is a liquid crystal display device 201 of the present invention described in FIG.
In addition, a lamp 213 for projecting a display, a projection lens system 214, and various adjustment signal input terminals 215 for the projector are included. Therefore, the image output to the liquid crystal display unit 211 can be exactly the same as that of the liquid crystal display device 201 of the present invention. Therefore, the overlapping description of that portion will not be given. In the liquid crystal projector type display device 250, more adjustments (settings) can be made by inputting various projector adjustment signals, which will be described below.

Various adjustment signal input terminals 21 for the projector
Various adjustment signals input from 5 are received by the CPU 204,
The CPU 204 distributes a control signal to each control unit. A zoom mechanism adjustment signal and a focus adjustment adjustment signal are supplied to the projection lens system 214, and a brightness adjustment signal, a contrast adjustment signal, a color density adjustment signal, a hue adjustment signal, an image quality (sharpness) adjustment signal are sent to the image processing chip 208. The color balance adjustment signal and the gamma value adjustment signal are sent to the horizontal scanning circuit 209 and the vertical scanning circuit 210, and the image scanning direction switching signal is sent to the lamp 21.
The light intensity adjustment signals of the lamps are assigned to 3 respectively.
Then, each adjustment unit performs adjustment according to the command signal. As a result, various adjustments can be made from the personal computer 101 to the image projected by the liquid crystal projector type display device. For example, the color of the display image can be adjusted, or the display screen can be zoomed up and enlarged. Further, when the display is not performed for a while or the display image does not change, it is possible to send a signal for power saving by reducing the light amount of the projection output. These effects are most effective in a presentation system in which the projector type image output device and the computer are placed in different rooms. This is because in these presentation systems, the computer operator and the person giving the presentation are in different rooms, and the operator often has to make various adjustments.

In order to further simplify the various adjustments,
The system can be equipped with a video camera 402. The video camera 402 is oriented toward the screen 401 on which the projector output image is displayed, and can read the displayed image information. Information from video camera 402 is video code 403
Through the NTSC in the personal computer 101
It is connected to the image processing chip. In the personal computer 101, the image information output to the liquid crystal projector type display device 205 is compared with the image information input from the video camera 402, and focus, brightness, contrast, color depth, hue, image quality (sharpness), color are compared. balance,
A signal for adjusting the gamma value, the image scanning direction, etc. is output to the liquid crystal projector type display device 205. Then, the change is reconfirmed by the video camera 402, and a defective point is readjusted. In this way, the image can be optimized under the control of the personal computer 101.

[0031]

According to the structure of the present invention, a dot clock signal is displayed on the liquid crystal display by adding a terminal for newly outputting the dot clock signal to the image output device and further adding a terminal for inputting the dot clock signal to the liquid crystal display device. There is an effect that it is not necessary to reproduce on the device side and the element configuration can be simplified. Further, since the image signal is allocated to each pixel using the dot clock signal used at the time of image combination, it is possible to display a high-quality image with little flicker or bleeding on the display. Further, by adding a horizontal dot number counter, a vertical dot number counter, a CPU, a RAM, a ROM, a manual input device for image adjustment, and an image processing chip, the ROM and RA
It is possible to perform display corresponding to many display modes stored in M, and it is possible to newly set image display even in display modes not stored in ROM or RAM. Save the settings in RAM. Even if the number of pixels in the liquid crystal display section is not equal to the number of pixels to be displayed, it is possible to display an image in an appropriate size corresponding to the liquid crystal display section.

Further, by adding terminals for outputting various adjustment signals for the liquid crystal projector type display device to the image output device and terminals for inputting various adjustment signals for the liquid crystal projector type display device, the liquid crystal projector type Various adjustments for the display device can be made from the computer side. By combining this system with a video camera, it is possible to automate various adjustments. In this case, adjustments with extremely good color reproducibility and good color balance can be made.
Further, it can be turned on and off automatically like an advertising display, and when displaying, it can be connected to a computer to display automatically.

Furthermore, by allocating each terminal to an empty terminal in the conventional input / output terminal group, the image output apparatus and the liquid crystal display apparatus up to now can be upwardly compatible, so that the computer side and the display apparatus ( Even if there is no dot clock signal input / output terminal or various adjustment signal input / output terminals for the projector for both liquid crystal and CRT, the image output can be performed using the existing image input / output terminal group (D-SUB15 pin). It is possible.

[Brief description of drawings]

FIG. 1 is a block diagram of a liquid crystal display device and a personal computer incorporating an image output device for a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a flowchart for displaying in several different display modes on the liquid crystal display device according to the embodiment of the present invention.

FIG. 3 is a block diagram of an example of a presentation system using a personal computer and a liquid crystal projector type image output device in which a liquid crystal projector type image output device according to an embodiment of the present invention is incorporated.

[Explanation of symbols]

101 ... Personal computer, 102 ... Image output device for liquid crystal display device, 103, 204 ... CPU, 104 ...
Graphic controller, 105 ... Frame memory,
106 ... D / A converter, 107 ... Dot clock signal output terminal, 201 ... Liquid crystal display device, 202 ... Horizontal dot number counter, 203 ... Vertical dot number counter, 20
5 ... RAM, 206 ... ROM, 207 ... Image adjustment manual input device, 208 ... Image processing chip, 209 ... Horizontal scanning circuit, 210 ... Vertical scanning circuit, 211 ... Liquid crystal display unit, 2
12 ... Dot clock signal input terminal, 301 ... Dot clock signal line, 302 ... Horizontal synchronization signal line, 303 ... Vertical synchronization signal line, 304 ... RGB image signal line.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Minor Hoshino Minoru Hoshino 7-1-1 Omika-cho, Hitachi-city, Ibaraki Hitachi Ltd. Hitachi Research Laboratory (72) Inventor Keiji Nagae 7-chome, Omika-cho, Hitachi-shi, Ibaraki No. 1 Hitachi Ltd. Hitachi Research Laboratory

Claims (6)

[Claims] 1. An image output device for a liquid crystal display device, wherein the image signal output terminal group includes a terminal for outputting a dot clock signal. 2. A liquid crystal display device, wherein a group of image signal input terminals includes terminals for inputting a dot clock signal. 3. The terminal according to claim 2, which has the dot clock signal, the horizontal synchronizing signal, the vertical synchronizing signal, and each of the R, G, B image signals as an input from a computer and is to be displayed. A horizontal dot number counter device for counting the number of horizontal dots of an image, a vertical dot number counter device for similarly counting the number of vertical dots, and
A CPU that determines the screen resolution by determining the screen resolution from the number of vertical dots, an image processing chip that converts an image according to this screen configuration, a key input device for inputting adjustment of this screen configuration, and the adjusted screen configuration A liquid crystal display device that includes a RAM for storing the settings of, and that displays according to signals with different screen resolutions of video. 4. An image output device for a liquid crystal display device, wherein the image signal output terminal group includes terminals for outputting various command signals for the liquid crystal projector device. 5. A liquid crystal projector type display device characterized in that the image signal input terminal group includes terminals for inputting various command signals for the liquid crystal projector device. 6. An image output device for a liquid crystal display device according to claim 5, wherein the liquid crystal display device according to claim 2 is used as a light valve.