Abstract: Described in this invention is a circuit for driving a thin film transistor liquid crystal display (TFT-LCD) which reduces the number of the analog switches and power consumption by omitting the large power consumption elements such as the operational amplifier and the push-pull amplifier.

Abstract: A display system has signal lines and scanning lines arranged in a matrix with the signal lines extending generally perpendicular to the scanning lines. At each intersection of the signal and scanning lines is a display unit, each such unit having a display element such as a liquid crystal display element, a switching means between the display element and the signal line, and a current limiting means between the switching element and the scanning line. By applying suitable signals to the signal and scanning lines, from suitable signal and scanning controllers, each display unit may be addressed. In order to prevent defects due to a short circuit across the switching element between the current limiting means and the signal line, signals are applied to the signal lines at times other than when signals are applied to the scanning lines. Therefore, a suitable voltage can be applied to any defective display unit so as to cause the display element to be controlled so that it is in the desired state.

Abstract: The optical response of the pixels of many flat panel display devices, such as liquid crystal displays (2), depends upon the spectral components, as well as the rms value, of the pixel voltage waveform during a frame period. Because each row and column electrode (10 and 11) addresses multiple pixels (14), the spectral voltage components of the voltage across any pixel during a frame period will depend upon the optical state of other pixels in the same column (11). This crosstalk phenomena can be greatly reduced by modifying the addressing signals. One method of modifying the addressing signals is to modulate them so that the spectral components of all pixel voltage waveforms fall primarily in a frequency band (54) in which the optical response is nearly independent of the frequency.

Abstract: This invention relates to an ideographical character signalling system, such as an ideographical character paging system, comprising: input means for inputting a plurality of first and second different types of ideographical characters, said input means including coding means for coding both said first and second types of ideographical characters according to a first code; signal processing means for receiving a data signal comprising said first and second types of ideographical characters coded according to said first code, said signal processing means comprising code converting means for selectively coding the coded first type of ideographical characters according to a second standard code.