Charge pump circuit
First Claim
1. A charge pump circuit comprising a series of voltage boosting stages, each stage comprising a switching means and a capacitive element connected in series between the input to the stage and a respective voltage control terminal, the output from each stage comprising the node between the switching means and the capacitive element, wherein the voltage control terminals comprise at least two groups of terminals receiving respective timed control voltages, and wherein adjacent stages are associated with different terminal groups, characterised in that the switching means of one or more stages comprises a lateral PIN junction diode.
8 Assignments
0 Petitions
Accused Products
Abstract
A charge pump circuit (1) comprises a series of voltage boosting stages (11), each stage (11) comprising a switching means (10) and a capacitive element (12) connected in series between the input to the stage and a respective voltage control terminal (14,15). The voltage control terminals (14,15) comprise at least two groups of terminals receiving respective timed control voltages, and adjacent stages (11) are associated with different terminal groups. The switching means (10) of one or more stages (11) comprises a lateral PIN junction diode. The use of diodes enables the charge pump circuit itself to operate from a lower supply voltage than is possible with the use of TFTs. The use of lateral PIN diodes enables the charge pump circuit to be formed using the same processing as may be required for TFT'"'"'s of the circuit to which the boosted voltage is supplied. This enables the charge pump circuit to be formed on a common substrate with higher voltage TFT circuitry for, for example, an AMLCD.
-
Citations
13 Claims
- 1. A charge pump circuit comprising a series of voltage boosting stages, each stage comprising a switching means and a capacitive element connected in series between the input to the stage and a respective voltage control terminal, the output from each stage comprising the node between the switching means and the capacitive element, wherein the voltage control terminals comprise at least two groups of terminals receiving respective timed control voltages, and wherein adjacent stages are associated with different terminal groups, characterised in that the switching means of one or more stages comprises a lateral PIN junction diode.
Specification