Image display system and image information transmission method

Abstract

To provide a display device capable of displaying a moving picture with high definition and at high speed. An image display system includes: an image display unit; and a control unit. The control unit has: a block discrimination circuit portion; an image processing portion; a storage portion; and a synchronizing signal generation portion. The block discrimination circuit portion discriminates a moving picture or a still picture to process the image information in accordance with the discriminated result, in which the number of gradations for the image information processed when the discriminated result is the moving picture is lower than when the discriminated result is the still picture. Thereby, the high definition image display and the high speed moving picture display can be effected by reducing the information with lower degree of recognition.

Description

[0001] The present application is a divisional application of application Ser. No. 09 / 961,176, filed Sep. 24, 2001, the contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION [0002] The present invention relates to an image display system, and more particularly to an image information transmission method in which the resolution, the number of gray scale level, and the rewriting speed for the display are changeable within the screen. [0003] In recent years, an image display apparatus has become thinner and lighter, a flat panel display such as a liquid crystal display, a PDP (Plasma Display Panel), and an EL display (Electroluminescent Display) has rapidly spread, in place of a CRT that was mainly employed for the image display apparatus. Also, the technical development of an FED (Field Emission Display) has also rapidly progressed. Moreover, the display of high definition, high speed moving picture has become requisite, along with the spread of personal c...

AI Technical Summary

Benefits of technology

[0016] A first object of the present invention is to provide an image transmission method conformable to the high definition image display and high speed moving picture display at the same time, making use of the visual characteristics of the human eyes for the still picture display and the moving picture display, and reducing the information with low degree of recognition.

[0022] Further, the invention allows a clear moving picture to be displayed without blur of the moving picture by transmitting the information of pixel block that is in the moving picture state by generating interpolated data between frames. Preferably, the information of pixel block that is in the moving picture state is transmitted at a compression ratio corresponding to the movement speed of the image information, whereby in the still picture area, a still picture can be displayed at high definition, and in the high speed moving picture area, a clear moving picture can be displayed. A slow speed moving picture can be displayed at higher definition and clearly.

[0024] Also, the image control unit has a moving picture memory and a still picture memory, and each image data is written beforehand in each frame memory in accordance with the discrimination data, so that the image data can be read and transferred at high rate.

[0026] Also, according to the movement speed of moving picture area, when the high speed display is needed, the amount of image data can be greatly reduced by image compression, and when the high speed display is not needed, the image data is transferred at lower image compression ratio to enable the display in accordance with the movement speed of moving picture.

[0027] Preferably, the image data is efficiently transferred by changing the image compression ratio in accordance with the size of a display window in the moving picture area and the display resolution. Further, the image data can be transferred efficiently by compressing the image data in accordance with the number of gray scale level and the display gradation ratio.

[0028] Also, this invention provides a broadcasting form for transmitting the image information employing a transmission system in which the image information has a moving picture flag and a still picture flag in a unit of block of plural pixels, and corresponding to the flag, the image information of one screen in a still picture flag area is transmitted at a transmission frequency equal to n time that of a moving picture flag area. Further, the still picture and the moving picture divided in a unit of transmission frequency is subjected to compression such as MPEG that is a moving picture compression method, whereby the compression ratio can be further increased, and the large information can be transmitted through the small transmission path.

Problems solved by technology

That is, with the conventional driving method for the image display method or the image display unit, it is difficult to cope with an increase in the display frequency that is caused by the higher definition display, due to a signal delay on the wiring, shortage of the writing time into each pixel, and increased scanning frequency.

According to this report, since there is inconsistency between a moving picture that is in hold luminescent and the movement of the line of sight pursuing the moving picture, some blur occurs in the moving picture, degrading the display quality of moving picture.

However, with the driving method for the image display method or the image display unit that is employed at present, as already described, the increase in display frequency has approached its upper limit.

Also, there was no description for the method of effecting both high definition and high speed display at the same time.

However, the high speed moving picture display is difficult to make due to the signal delay on the is wiring and the limited writing capability, while displaying the moving picture to be rewritten on the entire screen.

Accordingly, the image processing of the image control unit, and the transmission between the image control unit and the image display unit become difficult to make, along with the increased number of pixels and the higher frequency corresponding to the high definition and high speed display.

Further, since the image processing of the image control unit, and the transmission between the image control unit and the image display unit become difficult to make, the driving method and the transmission method capable of displaying the high definition, high speed moving picture that is increasingly demanded in the future must be provided.

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