Multi-level voltage supply circuit for liquid crystal display de

Details Multi-level voltage supply circuit for liquid crystal display de Multi-level voltage supply circuit for liquid crystal display de

1974-08-08

1976-02-03

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307205, 307209, 307296, 340324M, 340336, 350160LC, 357 42, H03K 1908, H03K 102, G02F 113, H01L 2978

Patent

active

039366766

ABSTRACT:
A multi-level voltage supply for liquid crystal display devices employs complementary metal-oxide-semiconductor field-effect transistors. The supply circuit proper includes a p type and an n type MOSFET which are connected in series with each other. A plurality of n-type MOSFETs are grouped together in pairs with their source and gate electrodes connected together and being connected in parallel with the first-mentioned n-type MOSFET. A plurality of voltage levels are applied to the circuit, the lowest of which is applied to the first-mentioned n-type MOSFET. Intermediate voltage levels are applied to the plural parts of n-type MOSFETs. Multi-level voltages for driving the liquid crystal display devices are provided at the connection point of the P-type MOSFET and the N-type MOSFETs of the plurality. As a result, it is possible to prevent the flow of a D.C. current between the lowest level voltage source and the intermediate level voltage source.

REFERENCES:
patent: 3654388 (1972-04-01), Slottow et al.
patent: 3787834 (1974-01-01), Elliott
patent: 3789388 (1974-01-01), Medwin
patent: 3794990 (1974-02-01), Kishimoto

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