Pixel unit for a display device and driving method thereof

Abstract

A pixel unit and driving method thereof are disclosed. The pixel unit includes a switch, a storage element and a first multiplexer. The switch develops a charge transfer path according to a scan signal associated with a scan line. The storage element has a first electrode coupled to the switch and a second electrode coupled to a reference voltage for receiving a pixel voltage via the charge transfer path. The first multiplexer is coupled to the second electrode of the storage element for selectively providing the reference voltage with a default value and the reference voltage with a determined value to the second electrode of the storage element according to a modulating signal. The driving method enlarges the voltage range of the first electrode of the storage element for enhancing the contrast ratio of the display panel.

Description

technical field [0001] The present invention relates to a pixel unit and a driving method thereof, and in particular to a pixel unit and a driving method thereof, which modulate a reference voltage supplied to a storage element. Background technique [0002] figure 1 Circuit diagram for the display panel. Please refer to figure 1 , the display panel 100 is composed of a plurality of pixel units 110 . The pixel units 110 are arranged in a matrix array, and each pixel unit 110 is formed in a region where two adjacent scan lines S1 , S2 and two adjacent data lines D1 , D2 intersect. The pixel unit 110 includes a switch T1, a pixel electrode Pi, a storage capacitor Cst, and a liquid crystal capacitor Clc, wherein the pixel electrode Pi is coupled to the switch T1. The first electrode and the second electrode of the storage capacitor Cst are respectively coupled to the pixel electrode Pi and the common voltage Vcom. [0003] From the perspective of semiconductor manufacturin...

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Problems solved by technology

It can be seen from this that only the pixel voltage range of 5 volts can represent the grayscale value of the image, thus resulting in insufficient contrast of the display panel 100

[0006] Similarly, the switching switch T1 implemented with an N-type transistor is affected by the body effect, and the voltage range transmitted to the pixel electrode Pi will be limited to 0-10 volts

Therefore, the common voltage Vcom has to be set to 5 volts to achieve polarity inversion, but it also causes the same problem as above

In short, due to the characteristics of electronic components, the switching switch T1 implemented with transistors cannot transmit the maximum voltage range of the power supply voltage to the pixel electrode Pi

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