Voltage generating circuit having charge pump and liquid crystal display using same
First Claim
1. A voltage generating circuit, comprising:
- a first pulse generator configured to provide a first pulse signal having a fixed duty ratio;
a second pulse generator configured to provide a second pulse signal having a variable duty ratio; and
a charge pump electrically coupled to the first pulse generator and the second pulse generator;
wherein the charge pump outputs a voltage signal according to the first and second pulse signals, when the voltage signal is adjusted, the duty ratio of the second pulse signal is modulated by the second pulse generator, such that the voltage signal outputted by the charge bump is adjusted to have a corresponding value.
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Abstract
An exemplary voltage generating circuit (34) includes a first pulse generator (341) configured to provide a first pulse signal having a fixed duty ratio, a second pulse generator (342) configured to provide a second pulse signal having a variable duty ratio, and a charge pump (343) electrically coupled to the first pulse generator and the second pulse generator. The charge pump outputs a voltage signal according to the first and second pulse signals. When the voltage signal is adjusted, the duty ratio of the second pulse signal is modulated by the second pulse generator, such that the voltage signal outputted by the charge bump is adjusted to have a corresponding value. A liquid crystal display (300) using the voltage generating circuit is also provided in the present invention.
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Citations
16 Claims
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1. A voltage generating circuit, comprising:
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a first pulse generator configured to provide a first pulse signal having a fixed duty ratio; a second pulse generator configured to provide a second pulse signal having a variable duty ratio; and a charge pump electrically coupled to the first pulse generator and the second pulse generator; wherein the charge pump outputs a voltage signal according to the first and second pulse signals, when the voltage signal is adjusted, the duty ratio of the second pulse signal is modulated by the second pulse generator, such that the voltage signal outputted by the charge bump is adjusted to have a corresponding value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A liquid crystal display, comprising:
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a liquid crystal panel comprising a plurality of pixels; and a voltage generating circuit configured to provide a common voltage signal for the pixels, the voltage generating circuit comprising a first pulse generator, a second generator, and a charge pump; wherein the charge pump receives a first pulse signal having a fixed duty ratio from the first pulse generator, and receives a second pulse signal having a variable duty ratio from the second pulse generator, and then outputs a common voltage signal to the pixels according to the first and second pulse signals, a value of the common voltage signal is adjusted when the duty ratio of the second pulse signal is modulated. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification