Matrix-addressed display device

• US 4,758,831 A
• Filed: 11/01/1985
• Issued: 07/19/1988
• Est. Priority Date: 11/05/1984
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Kasahara, Koichi, Saito, Akira
• Primary Examiner(s): Weldon, Ulysses
• Application Number:
  US06/793,784
• Time in Patent Office: 991 Days
• Field of Search: 340/800, 340/801, 340/802, 340/803, 340/804, 340/750, 340/747, 340/767, 340/768, 340/789, 340/805, 340/811, 340/812, 340/813, 340/784
• US Class Current: 345/94
• CPC Class Codes: H04N 3/127 using liquid crystals

Abstract

The invention is directed to a matrix-addressed display device having a matrix-addressed display element such as a liquid crystal element. The device comprises a sampling frequency generator generating sampling frequency signals. By the sampling frequency signals, the serially input video signals are sampled, held and consequently converted serial to parallel. The sampling frequency generator is provided with means for stopping the sampling frequency signal in periods when serial-parallel conversion is not required.

Claims

1. A matrix-addressed display device comprising:

a gated oscillator;

a sampling pulse generator generating sampling pulses in response to the output of said gated oscillator;

means for sampling a serially inputted video signal with said sampling pulses;

means for holding the sampled signal and converting it from a serial signal to a parallel signal;

picture display means for utilizing said parallel converted signal; and

means for stopping the operation of said gated oscillator during any period when said serial-parallel conversion is not required for the display of the inputted video signal having a logic gate coupled to said gated oscillator for stopping and for starting the oscillation of said gated oscillator in response to a control signal; and

a horizontal counter coupled to said logic gate, said counter counts the oscillated pulse of said gated oscillator up to the predetermined number of horizontal pixeles in relationship to an inputted horizontal synchronization signal and output said control signal to said logic gate.

2. The matrix-addressed display device of claim 1, wherein said means for stopping the operation of said gated oscillator further comprises:

a vertical counter coupled to said logic gate, said counter counts said inputted horizontal synchronization signal up to the predetermined number of vertical pixeles in relationship to an inputted vertical synchronization signal and outputs said control signal to said logic gate.