Abstract: In connection with a display apparatus that is held and swung by an operator to display images of pictures, letters, etc. in space using an afterimage effect, a party situated opposite to the operator is enabled to recognize the images displayed always at the central position of the swing range and with the same dimensions irrespective of the swinging speed and to see the same images displayed even of an asymmetrical pattern irrespective of the directions of the swing of the apparatus. The display apparatus has a transparent protective case covering both side faces, right and left, of an array of LEDs, a measuring unit to measure the cycle time of right and left reciprocating motion, a computing unit to process by computation the measured cycle time, a memory unit to memorize the processed results and a timer circuit unit to control turning the LEDs on and off.

Abstract: A device for displaying a parameter value has at least one row of light-emitting diodes in which each light-emitting diode has a position input, and the device has a control circuit with address outputs connected to the position inputs. Faults, such as a short-circuit can be detected more easily by an improved interconnection of the address outputs and position inputs such that two adjacent address outputs are connected to two position inputs physically separated by at least one position input.

Abstract: A display comprises a static unit (8) on which is mounted a rotating unit (7) driven by a motor (12). The rotating unit carries light emitting diodes (6) arranged as vertical columns which sweep around a cylindrical surface. The light emitting diodes (6) are controlled by a control circuit (6) in accordance with data stored in a memory (61) so as to provide a cylindrical display. The control circuit (60) and memory (61) are located in the rotating unit 97) and the memory (612) has a capacity for storing several different images for display.

Abstract: A drive apparatus for an optical element array includes a counter counting clock pulses and being periodically reset at a horizontal scanning period. The counter outputs first and second counter signals out of phase with each other. A latch holds a pixel-corresponding segment of an input image signal. One of clock signals out of phase with each other is selected in response to the pixel-corresponding input-signal segment held by the latch. A first comparator compares the first counter signal and the pixel-corresponding input-signal segment held by the latch, and outputs a first identity signal when the first counter signal and the pixel-corresponding input-signal segment are equal to each other. A second comparator compares the second counter signal and the pixel-corresponding input-signal segment held by the latch, and outputs a second identity signal when the second counter signal and the pixel-corresponding input-signal segment are equal to each other.

Abstract: The invention is directed to a display driver for a bar graph display comprising a multi-segment bar graph array. The driver controls the bar graph display to have an OFF-state associated with each ON-state in order to prevent ghost or phantom bars. Additionally, the driver is implemented without a microprocessor to avoid the need for shielding against radial frequency interference.

Abstract: Disclosed herein is a display to be applied to a digital switch. This display includes a casing (1) formed of a box-type casing (2) and a cover (3), a display element (8) facing a display window (2b) accommodated in the casing (1), a printed wiring board (9) for supporting the display element (8), and a printed wiring board (14) which is connected to the printed wiring board (9) and on which a control circuit (16) for displaying an external input signal on the display element (8), and the like are mounted. At the front portion of the casing (1) is formed frames 11a and 11b extending over a display face (8) of the display element (8), and thus a portion of the printed wiring board (9) which is located at the outer periphery of the display element (8) cannot be seen from the outside. A conductive pattern (18) for discharging a static electricity is provided on the printed wiring board (9), corresponding to a region in which the frames (11a, 11b) engaged with each other.