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US 7,746,330 B2Granted
Circuit and method for improving image quality of a liquid crystal display
AssigneeAu Optronics Corporation
InventorsChia-Wei Yu, Hung-Min Shih
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AssigneeAu Optronics Corporation
InventorsChia-Wei Yu, Hung-Min Shih
Estimating the term…
A circuit and method of reducing noises for improving quality of display in a liquid crystal display (LCD) system. The LCD system includes an LCD panel and at least one lamp. In operation the LCD system is supplied with a vertical synchronization signal and a horizontal synchronization signal. In one embodiment, the method comprises the steps of determining a lamp driving frequency for the at least one lamp responsive to the horizontal synchronization signal, and generating a lamp driving signal with the lamp driving frequency to be received by the at least one lamp for producing light, wherein the following formulae (1) and (2) are satisfied: f lamp = 2 n - 1 m H sync + δ ( 1 ) and H sync / m ≥ δ ≥ 0 ( 2 ) where Hsync is the frequency of the horizontal synchronization signal in unit of (Hz); flamp is the lamp driving frequency for the lamp driving signal in unit of (Hz); m, n=1, 2, 3, . . . , an integer; and δ indicates the permissible error of the lamp driving frequency.
A method of reducing noises for improving quality of display in a liquid crystal display (LCD) system, wherein the LCD system includes an LCD panel, at least one lamp for producing light to illuminate the LCD panel, and wherein in operation the LCD system is supplied with a video signal, a vertical synchronization signal and a horizontal synchronization signal, comprising the steps of:
A liquid crystal display (LCD) system, comprising:
A circuit to be used in a liquid crystal display (LCD) system, wherein the LCD system includes an LCD panel, and at least one lamp for producing light to illuminate the LCD panel, comprising:
A circuit to be used in a liquid crystal display (LCD) system, wherein the LCD system includes an LCD panel, and at least one lamp for producing light to illuminate the LCD panel, comprising:
A circuit to be used in a liquid crystal display (LCD) system, wherein the LCD system includes an LCD panel, and at least one lamp for producing light to illuminate the LCD panel, comprising an inverter,
A method of reducing noises for improving quality of display in a liquid crystal display (LCD) system, wherein the LCD system includes an LCD panel, at least one lamp for producing light to illuminate the LCD panel, and wherein in operation the LCD system is supplied with a video signal, a vertical synchronization signal and a horizontal synchronization signal, comprising the step of generating a lamp driving signal with a lamp driving frequency to be received by the at least one lamp for producing light responsive to the lamp driving signal, wherein the lamp driving frequency is not a harmonic of the frequency of the horizontal synchronization signal;
Dependencies are inferred from the claim text.