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US 8,896,588 B2Granted
Liquid crystal display device
AssigneeJapan Display Inc.
InventorYasuhiko Yamagishi
Life of this patent
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Abstract
The liquid crystal display device according to the present invention cancels the fluctuation in the potential of the common voltage so that the image quality of the screen displayed on the liquid crystal display panel can be prevented from deteriorating, and thus, a high quality image can be provided, and adopts a common symmetric method, such as a dot inverting method, as the method for driving the liquid crystal display device.
Claims8
A liquid crystal display device comprising:
- a liquid crystal display panel having a number of pixels;
- wherein each of said pixels has a pixel electrode to which an image voltage is supplied and a counter electrode to which a common voltage is supplied;
- and
- wherein when two pixels adjacent to each other along one display line are a first pixel and a second pixel, an image voltage at a potential higher than that of the common voltage supplied to the counter electrode is applied to the pixel electrode of the first pixel and an image voltage at a potential lower than that of the common voltage supplied to the counter electrode is applied to the pixel electrode of the second pixel when the image voltage is written into the pixel electrode;
- a common voltage generating circuit for generating a common voltage supplied to each of the counter electrodes of said pixels;
- a feedback means for detecting a fluctuation in the potential of the common voltage in a number of places within each of said counter electrodes so that the fluctuation is fed back to said common voltage generating circuit;
- and
- a supply end for supplying said common voltage to each of said counter electrodes from said common voltage generating circuit, characterized in that
- on the basis of a fluctuation in the potential that has been fed back by said feedback means, said common voltage generating circuit supplies a common voltage that is gained by superposing a reverse correction voltage for offsetting said fluctuation in the potential on a reference common voltage, which is a common voltage before said fluctuation in the potential is fed back, to the counter electrode;
- and
- when point A is located at a distance away from said supply end and point B is located closer to said supply end than point A, the voltage that fluctuates at said point A is voltage A and the voltage that fluctuates as said point B is voltage B, said feedback means detects fluctuations in the potential in two places for said voltage A and said voltage B so that the fluctuations are fed back to said common voltage generating circuit.
8 more elements
Dependencies are inferred from the claim text.