Abstract: An improved error diffusion filter for a DMD display (10) includes both an inverse gamma LUT (Look-up Table) (51) and an Error LUT (Look-up Table) (82), both responsive to the raster scan red, green, or blue video data for when the video data calls for an intensity level different from the achievable level of a DMD device. The Error LUT (82) provides an error value for that difference. The error is distributed to neighboring DMD devices.

Abstract: A capacitative load driving circuit is provided in a liquid crystal display device and has an input selection circuit having a wide and effective voltage range of an input signal. The driving circuit changes over through source or emitter followers formed by two types of conductivity, for detecting as to whether or not a potential of the input signal is in an input voltage range of a differential amplifier circuit constituting a voltage follower after selecting at least one input signal through any of source or emitter followers.

Abstract: An improved drive apparatus for a LC display screen is provided. The inventioned drive apparatus includes a programmable time setting means for changing drive currents in accordance with the size of the LC display screen. Depending upon the size of the LC display screen, it is necessary to change the drive current for charging up the display as promptly as possible at an initial stage of operation. The inventioned drive apparatus includes at least one time setting register means for programmably pre-setting a time according to the size of the display screen and a circuit selection means for providing a low resistor selection signal and a high resistor selection signal in accordance with the pre-set time of the time setting means.

Abstract: A large scale video display of the present invention is designed to receive a standard NTSC video signal and display it on a large scale array of low cost, voltage or current controlled lamp transducers. The video signals are received by a video capture device which receives and digitizes the video signal. A host processor formats the digital data into a number of 16 bit data words each corresponding to a pixel. A coprocessor receives the 16 bit data words and reformats the data. The reformatted data is connected to a large scale display by a fiber optic connection. The display includes a number of transceivers which receive the formatted video data in a memory buffer. The transceivers also receive a board map from the coprocessor. The map indicates which light boards correspond to each part of the memory where the frame image is stored. This information is used by a number of controllers to determine which lights to turn on and at what level of brightness for any given time.

Abstract: An electronic device that simplifies a use of a data processing system. The electronic device displays on a data processing system display device either data from the data processing system or data generated by the electronic device. The electronic device displays data on the display device to allow entry of data to the data processing system by using a touch sensitive screen placed over the display device. The operation of the electronic device is achieved without modification of the data processing system or application software executing in the data processing system.

Abstract: An converter apparatus to convert the (X, Y) coordinate of the two-dimensional screen position of a pixel to a linear address. The converter apparatus, which can be used with a variety of video displays of various resolutions including 1280.times.1024, 1152.times.900, 640.times.480, 1024.times.768, 1600.times.1280, and 800.times.600, contains three circuits in parallel disposition to receive and process various portions of the X and Y bits, and to output a Z-bit linear address. The first circuit mainly contains a multiplexer and it receives lower X bits as inputs; the second circuit contains a plurality of adders and multiplexers and a logical operation circuit, and it receives higher X bits and lower Y bits as inputs; and the third circuit mainly contains a multiplexer and it receives higher Y bits and at least a portion of the lower Y bits as inputs. The converter apparatus does not require a system CPU thus very high speed conversion can be achieved.

Abstract: A method and system for a pen-based computer system allow a user to automatically cancel a gesture in progress under several different conditions and terminate the operation of the system in a gesture recognition motion. In a first condition, a gesture cancel timeout period is stored in a memory of the system. The cancel timeout period is definitive of holding the input device in a motionless condition. When the timeout period is exceeded, a software application program recognize the excessive time period, terminates the operation of the system in gesture recognition mode. In another condition, a motion area is defined in the program for the input device. When the gesture executed by the input device exceeds the pre-defined motion area, the application program recognizes the excessive motion and terminates the operation of the system in the gesture recognition mode. In another condition, each input device is identified and stored in memory.