Abstract: An image display apparatus has a control circuit that periodically varies a characteristic, such as an amplitude characteristic or timing characteristic, of the displayed image signal. Periodic variations may be produced by passing the image signal through a variable inductance element, for example, or by alternately selecting two amplifier circuits with different gain characteristics, or by periodically delaying the image signal. The periodic variations reduce peaks in the spectrum of unintended radiation emissions, and suppress undesired moire patterns in the displayed image.

Abstract: A backlight system for use with a liquid-crystal display provides longer lamp lifetime through uniform temperature distribution, offers improved brightness uniformity and enhanced power-supply system efficiency, and ensures safety through lowered voltages. Linear lamps (21, 23) are divided into left and right approximately in the middle. The distance that heat travels is therefore shorter than when linear lamps have a length extending throughout the horizontal direction, which enables more uniform temperature distribution on the entire screen and lengthens the lifetime of linear lamps (21, 23). Furthermore, stray current is halved to achieve uniform brightness and enhanced inverter efficiency and safety can be easily ensured through lowered voltages.

Abstract: The present invention provides a display device capable of alleviating afterimage phenomena or, even in the event of the occurrence of afterimages, reducing the visibility thereof, and also provides a large-sized display apparatus employing the same. A non-self-luminous display device includes an image changing unit (image scaling-down processing circuit and image scaling-up processing circuit) for optionally changing the size of a displayed image, and an image moving unit (frame memory writing control circuit and frame memory readout control circuit) for moving the position of the displayed image which has been changed in size by the image changing unit (image scaling-down processing circuit and image scaling-up processing circuit), on the display region, at predetermined time intervals.

Abstract: A backlight system for use with a liquid-crystal display provides longer lamp lifetime through uniform temperature distribution, offers improved brightness uniformity and enhanced power-supply system efficiency, and ensures safety through lowered voltages. Linear lamps (21, 23) are divided into left and right approximately in the middle. The distance that heat travels is therefore shorter than when linear lamps have a length extending throughout the horizontal direction, which enables more uniform temperature distribution on the entire screen and lengthens the lifetime of linear lamps (21, 23). Furthermore, stray current is halved to achieve uniform brightness and enhanced inverter efficiency and safety can be easily ensured through lowered voltages.

Abstract: An image display device has an image output unit for displaying an overall image represented by an image signal, a region designation unit for designating a particular region within the overall image, the region designation unit including a position signal extraction unit for extracting a position signal from a predetermined signal on which the position signal is superimposed and received by the image display device, and a region decision unit for deciding the particular region on a basis of the position signal, and a control unit for selectively controlling an image quality of an image for the particular region.

Abstract: A beam current detection unit (5) detects the brightness of the image displayed on a screen (10) on the basis of a current J flowing inside a CRT (1). A drive control unit (40) selectively closes and opens the switches (42) and (43) in accordance with the detected brightness. Restriction characteristic against a current (I) flowing in a secondary winding (32) included in an inductor (3) is varied stepwise so that the inductance of a primary winding (31) is controlled. Thereby, the frequency characteristic of the gain of an amplifying unit (2) for amplifying an image signal (Pin) is controlled. The high frequency component of the gain is enhanced for a binary image of a normal display, whereas it is enfeebled for a binary image of a reverse display, for example. Thus, the visual quality of the image is optimized depending on the type of the image.

Abstract: A beam current detection unit (5) detects the brightness of the image displayed on a screen (10) on the basis of a current J flowing inside a CRT (1). A drive control unit (40) selectively closes and opens the switches (42) and (43) in accordance with the detected brightness. Restriction characteristic against a current (I) flowing in a secondary winding (32) included in an inductor (3) is varied stepwise so that the inductance of a primary winding (31) is controlled. Thereby, the frequency characteristic of the gain of an amplifying unit (2) for amplifying an image signal (Pin) is controlled. The high frequency component of the gain is enhanced for a binary image of a normal display, whereas it is enfeebled for a binary image of a reverse display, for example. Thus, the visual quality of the image is optimized depending on the type of the image.

Abstract: A video signal is inputted into a video signal detecting apparatus including one monostable multivibrator to latch in response to a rise of the video signal, and the other monostable multivibrator to latch in response to a fall of the video signal. Output from the multivibrators are ORed in an OR circuit which outputs the OR output as a video detecting signal. A control logic circuit adjusts an image position, image widths and so forth on a display screen depending upon the video detecting signal and horizontal and vertical synchronizing signals.

Abstract: A signal hybrid device has a first dual gate FET 7 having input control terminals for receiving and hybridizing a video signal transmitted through an input terminal 19 and a blank signal from an OSD 5 through one of the input control terminals, a second dual gate FET 8 having input control terminals for receiving and hybridizing a DC control voltage from a voltage power source and a video signal from the OSD 5 through one of the input control terminals, and a CRT driver 4 for supplying the hybrid video signal generated by the first and second dual gate FETs 7 and 8.

Abstract: This invention relates to a waveform generator used in a CRT display unit or the like, and to an apparatus for generating intended saw-tooth waveforms and parabolic waveforms under control of a microcomputer. The microcomputer produces a charging control signal having a prescribed pulse frequency and duty-cycle for forming a rising period in one cycle of the output waveform and supplies the signal to terminal a. Then, a capacitor is charged through a transistor and charging resistor. The microcomputer produces a discharging control signal having a prescribed pulse frequency and duty-cycle for forming a falling period in a cycle of the output waveform and supplies the signal to terminal b. Then, the capacitor is discharged through a transistor and discharging resistor. The output waveform voltage is produced across the capacitor.