Display unit for displaying an image based on a video signal received from a personal computer which is connected to an input device

#The present invention relates to an image display apparatus including an input unit such as a keyboard, a computer body and a display unit, and more particularly to an image display apparatus in which a display size, a display position and brightness of a picture in the display unit can be adjusted by the input unit such as the keyboard through the computer body to improve the handling capability. The image display apparatus of the present invention can be used in a work station and an advanced personal computer using a display unit.

#At present, in the display units for a computer terminal, the display position and size of the picture and a deflection frequency of a video signal to be displayed are variously different. Accordingly, one display unit for the computer terminal is designed to be able to treat various video signals.

#The display unit of this type employs a microcomputer and an LSI memory to provide an optimum picture display for each kind of video signals. Such a display unit in a prior art is disclosed in Japanese Patent Unexamined Publication No. 1-321475, for example.

#Preferred embodiments of the present invention will now be described in conjunction with the accompanying drawings, in which:

#FIG. 1 is a block diagram schematically illustrating a first embodiment of an image display apparatus according to the present invention;

#FIG. 2 is a block diagram schematically illustrating an actual example of a control signal addition circuit and a display control circuit shown in FIG. 1;

#FIG. 1 is a block diagram schematically illustrating a first embodiment of an image display apparatus according to the present invention. In FIG. 1, numeral 1a denotes a computer body, in which numeral 11 a CPU, 12 an input unit interface connected to the computer body 1a for processing various instruction signals inputted from a first input unit 10 (which transmits a user's intention to the computer) such as a keyboard, a mouse, a pen for input, 13 a memory circuit constituting a main memory, 14 an input/output port for connection with a peripheral device not shown, 15 a display control circuit for producing a video signal and a synchronizing signal for driving a display unit, 16 a control signal addition circuit for superposing or adding a control signal to the video signal or the synchronizing signal produced by the display control circuit 15, and 17 an external memory constituted by a floppy disk, a hard disk or a memory card which is disposed separately from the memory circuit 13. Further, numeral 1b denotes a display unit, in which numeral 18 denotes a control signal separation circuit for extracting the control signal from the video signal or the synchronizing signal on which the control signal produced by the control signal addition circuit 16 is superposed, 19 a first display control circuit for producing an adjustment signal for a predetermined circuit on the basis of the control signal extracted by the control signal separation circuit 18, 20 a video circuit, 21 a deflection circuit constituting display drive means, and 22 a cathode ray tube for displaying a video signal.

#Operation of FIG. 1 is now described. In the computer body 1a, other portions except the control signal addition circuit 16 are the same as the general configuration of a conventional personal computer or work station.

#When the user of the computer inputs a control instruction for adjustment of the display picture in the display unit 1b by means of a first input unit 10 such as a keyboard, a mouse, a pen for input connected to the computer body 1a, the input unit interface 12 converts the control instruction into a digital signal, which is recognized by the CPU 11 which controls the control signal addition circuit 16.