Electronic device of a source driver in an LCD device for enhancing output voltage accuracy
AssigneeNovatek Microelectronics Corp.
InventorsJi-Ting Chen, Ju-Lin Huang
Life of this patent
Estimating the term…
Abstract
An electronic device of a source driver in an LCD device, for enhancing accuracy of voltage outputted to an equivalent capacitor of a panel of the LCD device, includes a first node, a second node, an output unit, a first charge sharing switch, a second charge sharing switch, a first precharge switch, and a second precharge switch. The electronic device only uses two precharge switches to implement the precharge function and can decrease the current limiting resistor for enhancing the output voltage accuracy and decrease the charge time of the equivalent capacitor.
Claims17
An electronic device of a source driver in an LCD device, for enhancing accuracy of voltage outputted to an equivalent capacitor of a panel of the LCD device comprising:
- a first node;
- a second node;
- an output unit coupled to the source driver and the equivalent capacitor, for outputting an analog signal according to the signal generated by the source driver;
- a first charge sharing switch comprising a first terminal coupled to the output unit and the equivalent capacitor and a second terminal coupled to the first node, for controlling the connection between the first terminal and the second terminal according to a first control signal;
- a second charge sharing switch comprising a first terminal coupled to the output unit and the equivalent capacitor and a second terminal coupled to the second node, for controlling the connection between the first terminal and the second terminal according to a second control signal;
- a first precharge switch comprising a first terminal coupled to the first node and a second terminal coupled to a first voltage generator, for controlling the connection between the first terminal and the second terminal according to a third control signal;
- and
- a second precharge switch comprising a first terminal coupled to the second node and a second terminal coupled to a second voltage generator, for controlling the connection between the first terminal and the second terminal according to a fourth control signal.
An electronic device of a source driver in an LCD device, for enhancing accuracy of voltage outputted to a plurality of equivalent capacitors of a panel of the LCD device comprising:
- a first node;
- a second node;
- a plurality of first output devices, each first output device comprising:
- an output unit coupled to the source driver and one of the plurality of equivalent capacitors, for outputting an analog signal according to the signal generated by the source driver;
- a first charge sharing switch comprising a first terminal coupled to the output unit and the equivalent capacitor and a second terminal coupled to the first node, for controlling the connection between the first terminal and the second terminal according to a first control signal;
- and
- a second charge sharing switch comprising a first terminal coupled to the output unit and the equivalent capacitor and a second terminal coupled to the second node, for controlling the connection between the first terminal and the second terminal according to a second control signal;
- a plurality of second output devices, each second output device comprising:
- an output unit coupled to the source driver and one of the plurality of equivalent capacitors, for outputting an analog signal according to the signal generated by the source driver;
- a first charge sharing switch comprising a first terminal coupled to the output unit and the equivalent capacitor and a second terminal coupled to the second node, for controlling the connection between the first terminal and the second terminal according to a first control signal;
- and
- a second charge sharing switch comprising a first terminal coupled to the output unit and the equivalent capacitor and a second terminal coupled to the first node, for controlling the connection between the first terminal and the second terminal according to a second control signal;
- a first precharge switch comprising a first terminal coupled to the first node and a second terminal coupled to a first voltage generator, for controlling the connection between the first terminal and the second terminal according to a third control signal;
- and
- a second precharge switch comprising a first terminal coupled to the second node and a second terminal coupled to a second voltage generator, for controlling the connection between the first terminal and the second terminal according to a fourth control signal.
Dependencies are inferred from the claim text.