Patterned vertical alignment (PVA) pixel electrode and corresponding liquid crystal display device

Abstract

The invention provides a patterned vertical alignment (PVA) pixel electrode and a corresponding liquid crystal display device; the PVA pixel electrode comprises a first electrode which is arranged on a thin-film transistor (TFT) side and a second electrode which is arranged on a color filter (CF) side and corresponds to the first electrode; the pointing direction of liquid crystal between the first electrode and the second electrode is controlled by electric fields which are applied on the first electrode and the second electrode; the first electrode and the second electrode respectively form a certain inclining angle with the edge of a pixel; and indium tin oxide (ITO) spacing with different lengths is set for the first electrode and / or the second electrode at the junction of the edges of the first and the second electrodes, so that the spacing between the first electrode and the corresponding second electrode is gradually reduced in a direction from the inside of the pixel to the outside of the pixel. According to the PVA pixel electrode and the corresponding liquid crystal display device, the edge field effect is eliminated by changing the ITO spacing at the junction on the edge of the TFT side and / or the CF side, so that the effects of improving the penetration rate and the display quality of the pixel are achieved.

Description

Technical field [0001] The present invention relates to the field of liquid crystal display, in particular to a PVA pixel electrode and a corresponding liquid crystal display device that can improve the transmittance and display quality of pixels. Background technique [0002] PVA (Patterned Vertical Alignment, image vertical adjustment technology) as a mode of liquid crystal VA (Vertical Alignment, vertical adjustment technology) display, which uses TFT (Thin film transistor, thin film field effect tube) and CF (color filter, The electric field formed by the pattern on the color filter) side controls the orientation of the liquid crystal, which can eliminate the rubbing alignment process of the PI (polyimide) layer. [0003] The traditional PVA pixel structure, such as Figure 1A with Figure 1B As shown, Figure 1A Is a schematic diagram of the structure of the first electrode 10 on the TFT side of the PVA pixel electrode in the prior art, Figure 1B It is a schematic diagram of th...

AI Technical Summary

Problems solved by technology

Due to the difference between the edge of the PVA pixel electrode and the internal structure of this shape, the electric field distribution at the edge of the PVA pixel is different from the inside, and a fringe field effect is generated on the liquid crystal, which causes a rotational displacement (disclination) at the edge junction of the TFT and the CF side electrode. ), affecting the display quality of pixels and reducing the aperture ratio of pixels, such as Figure 5A As shown in the figure, due to the fringe field effect, the liquid crystal has a rotational displacement in the marked place, which makes the pixel appear dark lines, the transmittance is reduced, and the display quality of the pixel is affected.

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