Abstract: A method and system is provided for transferring data between a host and a video display through a video interface. The method includes the step of providing a horizontal sync line between the host and the video display with time intervals that are reserved for a horizontal sync signal. Another step is signaling to the host that the video display is able to participate in bidirectional data communications using the horizontal sync line. A further step is transferring data between the host and video display on the horizontal sync line during time intervals that are not reserved for the horizontal sync signal.

Abstract: An input unit having mouse functions is disclosed. The input unit is convenient for carrying and for storing in a notebook-sized personal computer. It has a reclosable finger support section, an open-close member having a switch and an open-close member having a switch on a plate-like main unit, and is operated as a mouse by sandwiching the finger support section between the forefinger and the middle finger. When it is not used, it is rendered plate-like by folding the finger support section, the open-close members so as to be stored in an IC card slot of the notebook-sized personal computer.

Abstract: A position indicator contains a resonant circuit. A first resistor having a minimum resistance, a second resistor having a maximum resistance, and a variable resistor whose resistance varies within the range of minimum to maximum resistances are connected to the resonant circuit at first, second, and third specific times based on predetermined timing information supplied from a tablet. Signal levels detected by the tablet at the first and second specific times are used as a lower limit and an upper limit of an operation quantity. Within this range, a signal level detected at the third specific time is converted into an operation quantity. Thus, the continuous quantity can be detected at a fast sampling rate without being influenced by the height and tilt of the position indicator.

Abstract: In order to attain an electric power saving for a liquid crystal display having a pre-charging unit, a signal line driving circuit according to the present invention is used in an active matrix type of a liquid crystal display, and it is characterized in that it applies a middle potential Vp serving as a pre-charging voltage and a gradation voltage corresponding to a picture data to a plurality of signal lines, and it has a latch 11 and a comparator 12 for comparing a picture data before one horizontal period with a picture data to be next displayed for each signal line, and a switch controller 13 for applying the middle potential Vp in accordance with the result compared by the comparator 12, and if a writing operation can be stably carried out at a high speed without any pre-charging operation, the pre-charging operation is not done. Thus, it is possible to reduce a loss of a current necessary for the pre-charging operation.

Abstract: A display device including a display area having a plurality of pixels arranged in a matrix includes a plurality of scan lines for selecting pixel rows, a multiplex signal line for transmitting a display signal to at least two pixels in one pixel row selected by each of the scan lines, and a select line provided independently of the plurality of scan lines. The scan lines, the multiplex signal line and the select line are disposed in the display area. The select line selects at least one of a plurality of pixels in the pixel row to which the multiplex signal line transmits the display signal.

Abstract: Drive circuits are incorporated in an active matrix image display apparatus and drive current-driven devices such as organic EL (electroluminescent) elements. Each of the drive circuits includes a drive transistor for driving the current-driven device and an auxiliary transistor connected parallel to the drive transistor and having a current driving capability which is n times the current driving capability of the drive transistor. In a portion (accelerated period) of a selected period, a drain current flows into the auxiliary transistor and a signal current flowing through a signal line, which represents a current to flow into the current-driven device, is (n+1) times a normal value. As a result, the effect of parasitic capacitors connected to signal lines is reduced, allowing the current-driven devices to be driven with an appropriate drive current even when signal currents are very small.

Abstract: A driving circuit of display. Two more thin film transistors is added to the original driving circuit of display so that the driving circuit now includes four thin film transistors such that the gate terminal of the thin film transistor's voltage level increases as the threshold voltage of the driving thin film transistor increases. The driving current of the thin film transistor is able to maintain a constant value so that the initial luminance of the display remains unchanged. Therefore, the present invention can effectively increase the average working life of the display.

Abstract: A method and apparatus for expressing a gray level with a decimal value in a plasma display panel that is capable of enhancing a picture quality. In the method and apparatus, a sustaining pulse is applied only to any one electrode of a sustaining electrode pair to thereby express a gray level with a decimal value.

Abstract: A reference voltage generating circuit which generates reference voltages at a plurality of levels, a voltage follower circuit for stabilizing the reference voltages at a plurality of levels and a gray scale voltage generating circuit which generates gray scale voltages at a plurality of levels from the stabilized reference voltages are provided. The voltage follower circuit includes a differential amplifier which receives at one input the reference voltages, first and second buffer circuits connected in parallel to each other, and a resistor. Outputs of the first and second buffer circuits are connected to each other through the resistor, with the output of the first buffer circuit being fed back to the other input of the differential amplifier and the output of the second buffer circuit being connected to serve as an output of the voltage follower circuit.

Abstract: An optical mouse of a dynamic range has an analog/digital (A/D) converter having an input range adjusted based on an input range control signal, the A/D converter receiving an input signal over the adjusted input range and converting the received signal into digital data, and an image data processor for determining on the basis of image data from the A/D converter whether a data concentrated distribution has occurred, detecting a level of the input range with the data concentrated distribution upon determining that the data concentrated distribution has occurred, outputting the input range control signal to the A/D converter according to the detected level and processing the image data from the A/D converter to detect motion data therefrom.