Abstract: A halftone printing system comprising reference level generation means for generating a reference gradiation level, decision means for comparing a gradation level input signal with the output signal from the reference level generation means and deciding if the gradation level input signal is greater than or equal to the reference gradation level output signal, count means for counting the number of output dots from the decision means and deliverying heat accumulation information on heat accumulated in a thermal head, and a pulse generator which generates pulses, corresponding to the gradation level input signal in accordance with the heat accumulation information from the count means.

Abstract: A color signal emphasizing/de-emphasizing method and apparatus are for outputting image data scanned from the target image in every pixel on a color print or a color display by means of three principle color signals. This method and apparatus are intended to obtain a desired hue variation or color saturation by emphasizing/de-emphasizing one of the three principle color signals. The three principle colors are classified into a primary color portion signal, a secondary color portion signal and tertiary color portion signal. These designated signals of color portions are respectively multiplied by color coefficients predetermined for each designated signal. Finally, a corrected color signal is obtained by summing up these multiplied signals in every principle color.

Abstract: A transistor causes a current to flow through a heat generating resistor in response to a picture signal and simultaneously, a capacitor coupled to the transistor is charged. When a charged voltage on the capacitor reaches a predetermined magnitude, the transistor stops the current to prevent the resistor from exceeding a predetermined magnitude and the capacitor begins to discharge. A plurality of resistors mentioned above are disposed in a row to form a thermally sensitive head which records a picture image on thermally sensitive paper as determined by the respective picture signals.

Abstract: A thermal recording head comprises a supporting substrate having a wiring pattern wherein a plurality of heating elements arranged linearly and a plurality of lead-out wires connected respectively to each heating element are formed on the end surface and said lead-out wires are elongated to the adjacent side surface selective terminals connected to a plurality of said heating elements a wiring substrate having a wiring pattern having signal terminals for applying a selective signal for selecting said heating elements and a diode matrix connected to said terminals; a plurality of diodes which are connected between said wiring pattern on said supporting substrate and said wiring pattern on said wiring substrate and which form said diode matrix in the space facing said wiring patterns.

Abstract: A gas discharge display panel is disclosed for displaying images by selectively making luminescent cross points of main electrodes arranged to form the matrix through a discharge gap. The display includes a switching operation part which comprises auxiliary electrodes which are arranged in parallel to the main electrodes and to which a turn-on or turn-off pulse is applied and switching electrodes which cross the auxiliary electrodes to form the matrix through the discharge gap so as to select predetermined cross points of the auxiliary electrodes. The switching operation part is incorporated in the panel together with a display part comprising the main electrodes to form the matrix through the discharge gaps whereby switching circuits for switching each of the main electrodes which are complicated and expensive can be improved.