Portable television receiver of the panel type

Claim 1

A panel type portable television receiver using a liquid crystal display panel with a dot matrix array comprising: A/D converting means for sampling a video signal M times in accordance with a sampling clock within a period of an effective horizontal display and for converting said video signal to N-bit digital data; (N-bit×M-stage shift register means for sequentially shifting said N-bit digital data converted by said A/D converting means in synchronism with said sampling clock used as a shift clock; (N-bit×M-stage buffer circuit means for latching data stored in said shift register by a latch pulse having a cycle of an integral multiple of a horizontal scanning cycle; intensity modulation pulse generating circuit means for generating N kinds of intensity modulation pulses; M-stage logic circuit means to which are applied said N kinds of intensity modulation pulses from said pulse generating circuit and said N-bit digital data from said buffer circuit, said logic circuit means producing gradation signals having 2 N kinds of pulse widths corresponding to said digital data; voltage selecting circuit means for decoding said gradation signals from said logic circuit and for producing an output signal tht varies with said gradation signals; scanning signal generating circuit means for sequentially outputting a scanning signal in synchronism with said latch pulse; and dot matrix liquid crystal display panel means of the twist nematic type which is driven by supplying a signal electrode with an output signal from said voltge selecting circuit and supplying a scanning electrode with said scanning signal from said scanning signal generating circuit.