TFT-LCD (Thin Film Transistor Liquid Crystal Display) array substrate and manufacturing method thereof

Abstract

The invention relates to a TFT-LCD (Thin Film Transistor Liquid Crystal Display) array substrate and a manufacturing method thereof. The array substrate comprises a first grid line, a second grid line and a data line which are formed on the substrate and used for limiting a pixel region, a pixel electrode, a first thin film transistor and a second thin film transistor are formed in the pixel region, and the first thin film transistor and the second thin film transistor are provided with same parasitic capacitors. When the first grid line supplies a starting voltage to the first thin film transistor, the second grid line supplies a first voltage to the second thin film transistor. When the first grid line supplies a shutdown voltage to the first thin film transistor, the second grid line supplies a second voltage to the second thin film transistor, and the difference between the starting voltage and the shutdown voltage equals to the difference between the second voltage and the first voltage. Because two grid lines and two thin film transistors are adopted and the parasitic capacitors of the two thin film transistors are the same, the variation of electric charges stored by the two parasitic capacitors are equal in quantity and opposite in sign when the charging is completed. Thus, the charge variation amount on the pixel electrode is 0, and the leaping voltage of the pixel electrode is effectively eliminated.

Description

technical field [0001] The invention relates to a thin film transistor liquid crystal display and a manufacturing method thereof, in particular to a TFT-LCD array substrate and a manufacturing method thereof. Background technique [0002] Thin Film Transistor Liquid Crystal Display (TFT-LCD for short) has the characteristics of small size, low power consumption, and no radiation, and occupies a dominant position in the current flat panel display market. TFT-LCD is mainly composed of an array substrate and a color filter substrate in a box, wherein gate lines, data lines, pixel electrodes and thin film transistors are formed on the array substrate, and each pixel electrode is controlled by a thin film transistor. When the thin film transistor is turned on, the pixel electrode is charged during the turn-on time, and after the thin film transistor is turned off, the voltage of the pixel electrode will be maintained until recharging in the next scan. [0003] For the single-gat...

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Problems solved by technology

[0003] For the single gate structure commonly used in the prior art, due to the overlap between the drain electrode and the gate electrode in the thin film transistor, the thin film transistor has a parasitic capacitance Cgd

At the moment when the thin film transistor is turned off, the charge Qgd stored on the parasitic capacitance Cgd changes, causing the charge distribution on the pixel electrode to change, so that the voltage applied to the pixel electrode changes, causing the pixel electrode to generate a jump voltage ΔVp , causing the screen to flicker

In actual production, due to the instability of the process and equipment, the overlapping area between the drain electrode and the gate electrode at different positions on the same motherboard is uneven, causing the parasitic capacitance Cgd to vary in size, resulting in the jumping of each pixel electrode. The variable voltage ΔVp is different, which in turn causes the irregular distribution of the pixel electrode voltage, which makes the picture display uneven and seriously affects the picture quality

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