Synchronizing circuit for matrix television set

Details Synchronizing circuit for matrix television set Synchronizing circuit for matrix television set

1981-08-21

1983-07-12

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358158, H04N 504, H04N 508

Patent

active

043934056

ABSTRACT:
A synchronizing circuit especially suitable for a matrix television set using a flat display, such as comprised of liquid crystals, light emitting diodes or electro-luminescent elements in place of a cathode ray tube, is provided. Signals necessary for horizontal and vertical scannings, or the like, are obtained by dividing the signal from an oscillator circuit. The frequency of the oscillator circuit does not equal that of the horizontal scanning signal, that is, in the order of 16 KHz. Phase comparison is performed on a horizontal synchronizing signal and a scanning signal, which is obtained by dividing the signal from the oscillator circuit, to apply negative feedback to the oscillator circuit whereby synchronization is performed. The oscillator is voltage controlled. The circuit is fabricated in a substantially integrated construction using few external parts.

REFERENCES:
patent: 3752910 (1973-08-01), Lewis
patent: 3771016 (1973-11-01), Toba et al.
patent: 3909788 (1975-09-01), Kaelin et al.
patent: 4198659 (1980-04-01), Iijima et al.
Takaya Kitao et al., An Integrated Sync Circuit for TV Receivers, Jul. 6, 1970, pp. 227-233.
Tatsuhiko Niina et al., A High-Brightness Gap Green Led Flat-Panel Device for Character and TV Display, IEEE Transactions on Electrons Devices, vol. ED 26, No. Aug. 1979, pp. 1182-1186.
Richard D. Ketchpel et al., High Resolution Thin-Film EL TV Display System, SID 80 Digest, pp. 68-69.
Takehiro Kojima, Recent Flat-Panel Display Development in Japan, SID 80 Digest, pp. 22-23.

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